CN111374838A - Absorbent article - Google Patents

Abstract

The invention provides an absorbent article which has excellent fitting property with respect to a wearer after absorbing body fluid and can make a skin care agent effectively act on the skin of the wearer. The invention provides an absorbent article, which comprises a front sheet (12), a back sheet (13) and an absorbent body (14), wherein the absorbent body (14) at least comprises an absorbent core and a core wrap sheet covering at least the non-skin side surface of the absorbent core, the absorbent core comprises a high water-absorbing polymer of more than 90 mass% relative to the total amount of absorbent materials, the high water-absorbing polymer is fixed on the core wrap sheet by an adhesive (51) on at least the non-skin side surface of the absorbent core, the absorbent core is provided with a low unit area weight part extending along the length direction (L), a member positioned on the skin side of the absorbent core is provided with a skin care agent coating part (48) coated with a skin care agent containing a skin care component, and the skin care agent coating part (48) and the low unit area weight part do not overlap in the thickness direction (T).

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article.

Background

An absorbent article including an absorbent body having a low basis weight portion is known.

For example, patent document 1 discloses an absorbent article including a front sheet, a back sheet, and an absorbent body disposed between the front sheet and the back sheet, wherein the absorbent body includes a low basis weight portion extending in a longitudinal direction, and a skin care agent is applied to the front sheet so as to at least partially overlap with the low basis weight portion.

In general, by providing the absorbent body with the low basis weight portion, the absorbent body is easily deformed in accordance with the wearer, and the fit of the absorbent article to the wearer is improved.

Documents of the prior art

Patent document

Patent document 1: japanese Kohyo publication (Kohyo publication) No. 2017-509447

Disclosure of Invention

Problems to be solved by the invention

However, in the absorbent article described in patent document 1, since the weight per unit area of the superabsorbent polymer in the low weight-per-unit area portion is low, when the skin care agent is applied so as to overlap the low weight-per-unit area portion, components contained in the skin care agent permeate in the thickness direction of the low weight-per-unit area portion, and the adhesive agent or the like to which the superabsorbent polymer is fixed is softened, and as a result, the strength of the absorbent body is weakened in the vicinity of the low weight-per-unit area portion, and therefore, if the superabsorbent polymer swells after absorbing body fluid and stress is applied to the absorbent body, the absorbent body may be deformed, and the fit of the absorbent article to the wearer may be problematic.

In the absorbent body provided with the low basis weight portion, the super absorbent polymer swells after absorbing body fluid, and the periphery thereof may bulge compared with the low basis weight portion. In the absorbent article described in patent document 1, the skin care agent is applied to the topsheet so as to partially overlap the low basis weight portion, but in such a case, the skin care agent applied to the portion overlapping the low basis weight portion is less likely to come into contact with the skin, and the skin care agent may not be able to effectively act on the skin.

Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide an absorbent article which is excellent in the fit to a wearer even after absorption of body fluid and which can effectively act a skin care agent on the skin of the wearer.

Means for solving the problems

The present inventors have proposed an absorbent article comprising a front sheet, a back sheet, and an absorbent body disposed between the front sheet and the back sheet, the absorbent body having a longitudinal direction, a width direction, and a thickness direction which are orthogonal to each other, wherein the absorbent body comprises at least an absorbent core and a core wrap sheet covering at least a non-skin side surface of the absorbent core, the absorbent core comprises a superabsorbent polymer in an amount of 90 mass% or more relative to the total amount of an absorbent material, the superabsorbent polymer is fixed to the core wrap sheet at least at the non-skin side surface of the absorbent core with an adhesive, the absorbent core comprises a low basis weight portion extending in the longitudinal direction and having a basis weight lower than that of the superabsorbent polymer in the surrounding area, and a member located on the skin side of the absorbent core has a skin care agent application portion to which a skin care agent containing a skin care component is applied, the skin care agent-coated portion and the low basis weight portion do not overlap in the thickness direction.

ADVANTAGEOUS EFFECTS OF INVENTION

The absorbent article of the present invention is excellent in the fit to the wearer after absorbing body fluid, and can effectively apply the skin care agent to the skin of the wearer.

Drawings

Fig. 1 is a plan view showing a state in which a pants-type diaper is unfolded.

Fig. 2 is a sectional view taken along line II-II of fig. 1.

Fig. 3 is a view showing a configuration example of the absorber, fig. 3 (a) is a plan view, and fig. 3 (b) is a cross-sectional view taken along line IIIb-IIIb in fig. 3 (a).

Fig. 4 is a schematic sectional view showing a state in which the shape of the absorbent body before and after water absorption changes.

Description of the reference numerals

1: pants-type diaper

10: absorbent body

12: surface sheet

14: absorbent body

18: skin care agent application section

43: intermediate layer

44: no. 1 base material

45: no. 1 Water absorbent Material

46: no. 2 base material

47: no. 2 Water-absorbing Material

48: channel

51: adhesive agent

Detailed Description

< technical means of the present invention >

The present invention relates to the following technical means.

[ solution 1 ]

(Structure)

An absorbent article comprising a front sheet, a back sheet, and an absorbent body disposed between the front sheet and the back sheet, the absorbent article having a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other,

the absorbent body comprising at least an absorbent core and a core wrap sheet covering at least the non-skin side of the absorbent core,

the absorbent core contains 90 mass% or more of a super absorbent polymer with respect to the total amount of the absorbent material,

the superabsorbent polymer is secured to the core wrap sheet on at least the non-skin side of the absorbent core with an adhesive,

the absorbent core is provided with a low unit area weight part which extends along the length direction and has a lower unit area weight of the super absorbent polymer than the surrounding,

the member located on the skin side of the absorbent core has a skin care agent coating section coated with a skin care agent containing a skin care ingredient,

the skin care agent-coated portion and the low basis weight portion do not overlap in the thickness direction.

(Effect)

The absorbent article according to claim 1 of the present invention comprises 90 mass% or more of the superabsorbent polymer with respect to the total amount of the absorbent material, and the absorbent core has the low basis weight portion extending in the longitudinal direction, and after absorbing body fluid, the periphery of the low basis weight portion is likely to bulge compared with the low basis weight portion, and the periphery of the portion overlapping with the low basis weight portion in the thickness direction is likely to come into surface contact with the skin of the wearer.

Here, the absorbent article has a skin care agent application section around a portion of the member located closer to the skin than the absorbent core, the portion overlapping the low basis weight section in the thickness direction. Therefore, since the skin care agent is not present in the region overlapping the low basis weight portion in the thickness direction, it is difficult for the skin care agent to soften the adhesive for fixing the super absorbent polymer to at least the non-skin side surface of the absorbent core in the low basis weight portion. In addition, in the region adjacent to the low basis weight portion, the superabsorbent polymer is present at a higher basis weight than the low basis weight portion, and therefore the skin care agent is less likely to penetrate into the absorbent core. This makes it difficult for the absorbent to deform even if the superabsorbent polymer swells after absorbing body fluid.

Further, since the skin care agent and the low basis weight portion do not overlap in the thickness direction, the skin care agent is likely to come into contact with the skin of the wearer after absorbing body fluid, and the skin care agent is likely to effectively act on the skin of the wearer.

[ solution 2 ]

(Structure)

The absorbent article according to claim 1, wherein,

the skin care agent application section is provided on the skin side of the topsheet.

(Effect)

According to the invention of claim 2, since the skin care agent-applied portion is disposed on the skin side of the topsheet, the skin care agent can be easily applied directly to the skin of the wearer, and the skin care agent can be easily applied more effectively to the skin of the wearer. Further, since the skin care agent is disposed at a position away from the adhesive for fixing the super absorbent polymer, it is difficult to soften the adhesive, and the absorbent body is difficult to be deformed.

[ solution 3 ]

(Structure)

The absorbent article according to claim 1 or 2, wherein,

the absorbent core is a laminated absorbent core in which a 1 st water absorbent material containing the super absorbent polymer, an intermediate layer, and a 2 nd water absorbent material containing the super absorbent polymer are laminated in this order from the skin side toward the non-skin side.

(Effect)

According toclaim 3 of the present invention, since the absorbent core has the intermediate layer in addition to the water absorbing materials which are the 1 st water absorbing material and the 2 nd water absorbing material each containing a super absorbent polymer, the intermediate layer can easily maintain the structure of the absorbent core even after absorbing body fluid, and the absorbent body is less likely to be deformed. This further improves the fit of the absorbent article after absorption of body fluid.

[ solution 4 ]

(Structure)

The absorbent article according toclaim 3, wherein,

the middle layer is hot air non-woven fabric.

(Effect)

The hot air non-woven fabric is a non-woven fabric in which the interweaving portions between fibers are thermally fused together, and has high mechanical strength. According to the invention ofclaim 4, the intermediate layer as the air-through nonwoven fabric is easy to maintain the shape of the absorbent body, and the absorbent body is less likely to be deformed even after absorbing body fluid, so that the adhesiveness of the absorbent article after absorbing body fluid is improved.

[ solution 5 ]

(Structure)

The absorbent article according toclaim 3 or 4, wherein,

the dimension of the 2 nd water absorbent material in the longitudinal direction is larger than the maximum dimension of the 1 st water absorbent material in the longitudinal direction, and the dimension of the 2 nd water absorbent material in the width direction is larger than the maximum dimension of the 1 st water absorbent material in the width direction.

(Effect)

According to the 5 th aspect of the present invention, since the dimension in the longitudinal direction and the dimension in the width direction of the 2 nd water absorbent material are larger than the maximum dimension in the longitudinal direction and the dimension in the width direction of the 1 st water absorbent material, respectively, the weight per unit area of the super absorbent polymer increases in the vicinity of the excretory opening abutment portion, and body fluid can be efficiently absorbed. Further, the weight per unit area of the super absorbent polymer is low at the edges in the longitudinal direction and the width direction of the absorbent body, and therefore, the fit of the absorbent article to the wearer is further improved.

[ solution 6 ]

(Structure)

The absorbent article according toclaim 5, wherein,

the skin care agent-coated portion overlaps with the 2 nd water absorbent material in the thickness direction.

(Effect)

According to the invention of claim 6, since the skin care agent-applied portion is provided in the region overlapping with the 2 nd water absorbent material in the thickness direction, the weight per unit area of the super absorbent polymer is higher than that of the surroundings, the skin care agent is more likely to contact the skin of the wearer, and the skin care agent is likely to act more effectively on the skin of the wearer.

[ solution 7 ]

(Structure)

The absorbent article according to any one ofclaims 3 to 5, wherein,

in the 2 nd water-absorbent material, the weight per unit area of the superabsorbent polymer in the low weight-per-unit-area portion is lower than the weight per unit area of the superabsorbent polymer in the periphery of the low weight-per-unit-area portion,

in the 1 st water-absorbent material, the weight per unit area of the superabsorbent polymer in the low weight-per-unit-area portion is equal to the weight per unit area of the superabsorbent polymer in the periphery of the low weight-per-unit-area portion.

(Effect)

According to the 7 th aspect of the present invention, the low basis weight portion is provided by reducing the basis weight of the superabsorbent polymer in the region corresponding to the 2 nd absorbent material, while the low basis weight portion is not provided in the 1 st absorbent material, and the basis weight of the superabsorbent polymer in the 1 st absorbent material is maintained high, so that the skin care agent applied to the member located on the skin side of the absorbent core is less likely to penetrate into the absorbent core, and the absorbent body is less likely to have a shape after absorbing body fluid. This further improves the fit of the absorbent article to the wearer.

Underpants type disposable diaper

Hereinafter, a pants-type disposable diaper according to the embodiment (hereinafter, also simply referred to as "pants-type diaper") will be described. The type of the pants-type diaper is not limited to this example, and other types of pants-type diapers may be used without departing from the scope of the present invention. Examples of such other types of pants-type diapers include 3-piece diapers. The absorbent article of the present invention is not limited to the pants-type diaper 1, and may be a tape-fixed disposable diaper, a urine absorption pad used in combination with another absorbent article, a light incontinence pad, a sanitary napkin, a panty liner, or the like.

Fig. 1 and 2 are views showing a configuration example of a pants-type diaper 1 according to an embodiment. Fig. 1 is a plan view showing a state in which a pants-type diaper 1 is unfolded, and fig. 2 is a sectional view taken along line II-II of fig. 1. In fig. 2, the pants-type diaper 1 according to the present embodiment is shown in an enlarged size in the thickness direction T so as to be easily understood. The pants-type diaper 1 has a longitudinal direction L, a width direction W, and a thickness direction T which are orthogonal to each other in the state shown in fig. 1, and has a longitudinal direction center line CL which passes through the center of the width direction W and extends in the longitudinal direction L, and a width direction center line CW which passes through the center of the length direction L and extends in the width direction W. The direction and the side close to the longitudinal center line CL are set as the inward direction and the inward side in the width direction W, respectively, and the direction and the side away from the longitudinal center line CL are set as the outward direction and the outward side in the width direction W, respectively. The direction and the side closer to the width direction center line CW are set as the inward direction and the inward side in the longitudinal direction L, respectively, and the direction and the side farther from the width direction center line CW are set as the outward direction and the outward side in the longitudinal direction L, respectively. Further, a side in the longitudinal direction L that faces an end edge of the pants-type diaper 1 corresponding to the abdomen of the wearer (an end edge on the abdomen side) is referred to as a front side in the longitudinal direction L, and a side that faces an end edge of the pants-type diaper 1 corresponding to the back of the wearer (an end edge on the back side) is referred to as a rear side in the longitudinal direction L. The "plan view" refers to the pants-type diaper 1 in a state where a plane including the longitudinal direction L and the width direction W is developed as viewed from above in the thickness direction T, and the "plan view" refers to a shape grasped in the plan view. The "planar direction" is an arbitrary direction parallel to a plane including the width direction W and the length direction L. The "skin side" and the "non-skin side" refer to a side that is relatively close to the skin surface of the wearer and a side that is relatively far from the skin surface of the wearer in the thickness direction T when the pants-type diaper 1 is worn on the wearer, and the skin-side surface of each member of the pants-type diaper 1 is referred to as a "skin-side surface" and the non-skin-side surface is referred to as a "non-skin-side surface", respectively. These definitions apply not only to the pants-type diaper 1 but also to theabsorbent body 14 of the pants-type diaper 1 and the respective materials disposed thereon.

The member, structure, shape, and the like extend along the longitudinal direction L, and include not only a case where the member and the like are parallel to the longitudinal direction L, but also a case where the component Dx in the longitudinal direction L of the member and the like is larger than the component Dy in the width direction W of the member and the like (Dx > Dy). Similarly, the member or the like extends in the width direction W, and includes not only a case where the member or the like is parallel to the width direction W but also a case where the component Dy in the width direction W of the member or the like is larger than the component Dx in the longitudinal direction L of the member or the like (Dy > Dx). For a curved or curved member, the member is evaluated as described above with respect to the tangent line at each point on the curve or the like.

As shown in fig. 1, the pants-type diaper 1 includes a front side portion (front side waistband) 2, a back side portion (back side waistband) 3, and an absorbentmain body 10 positioned between the front side portion 2 and theback side portion 3 in a longitudinal direction L. In the present embodiment, the pants-type diaper 1 further includes acrotch portion 4 located between the abdomen-side portion 2 and the back-side portion 3. The abdominal portion 2 is a portion that abuts against the abdomen of the wearer. Theback portion 3 is a portion that abuts against the hip or the back of the wearer. Theabsorbent body 10 is a portion that contacts the crotch of the wearer, and has one end portion in the longitudinal direction L stacked on the stomach-side portion 2 and the other end portion stacked on the back-side portion 3. Thecrotch portion 4 is a portion that supports the absorbentmain body 10 from the non-skin side. The pants-type diaper 1 is formed by overlapping bothend portions 2a, 2a in the width direction W of the front side portion 2 and bothend portions 3a, 3a in the width direction W of theback side portion 3 in the thickness direction T, respectively, and joining them along the longitudinal direction L. In this case, in the pants-type diaper 1, the waist opening through which the waist of the wearer passes is defined by theouter end 2e of the stomach-side portion 2 in the longitudinal direction L and theouter end 3e of the back-side portion 3 in the longitudinal direction L. In the pants-type diaper 1, a pair of leg openings through which the legs of the wearer pass are defined by theside portions 5e, 5e on both sides in the width direction W of thecrotch portion 4. The abdomen-side portion (abdomen-side waistband) 2 and the back-side portion (back-side waistband) 3 can be said to be defined by the range of the longitudinal direction L in which the bothend portions 2a, 2a and the bothend portions 3a, 3a are joined.

In the present embodiment, in the state shown in fig. 1, each of the ventral portion 2 and thedorsal portion 3 has a rectangular shape that is expanded substantially in the width direction W and is separated from each other in the longitudinal direction L. Thecrotch portion 4 is located between the stomach portion 2 and theback portion 3, and both side edges in the width direction W are recessed inward in the width direction W. The stomach-side portion 2, thecrotch portion 4, and the back-side portion 3 are integrally formed with each other. In another embodiment, the stomach-side portion, the crotch portion, and the back-side portion are formed independently of each other. In another embodiment, the pants-type diaper includes a front portion and a back portion, and does not include a crotch portion.

In the present embodiment, the stomach portion 2, theback portion 3, and thecrotch portion 4 are provided with liquid-impermeable cover sheets (sheet members) 5. Thecover sheet 5 includes a cover sheet 5a on the skin side and a cover sheet 5b on the non-skin side. The cover sheet 5a and the cover sheet 5b are laminated in the thickness direction T and bonded to each other with an adhesive 51 or the like. Both ends in the longitudinal direction L of the covering sheet 5b are folded back toward the skin side so as to cover both ends in the longitudinal direction L of the covering sheet 5 a. In this case, the portion of the covering sheet 5b at the folded-back position of the abdomen portion 2 constitutes theend 2e of the abdomen portion 2, and the portion of the covering sheet 5b at the folded-back position of theback portion 3 constitutes theend 3e of theback portion 3.

Examples of thecover sheet 5 include any liquid impermeable sheet such as a liquid impermeable nonwoven fabric, a synthetic resin film, a composite sheet thereof, an SB nonwoven fabric, and an SMS nonwoven fabric. Examples of the material of thecover sheet 5 include polyolefin materials such as polypropylene and polyethylene. The weight per unit area of thecover sheet 5 is, for example, 5g/m²～100g/m²Preferably 10g/m²～50g/m². The dimension (thickness) of thecover sheet 5 in the thickness direction T is, for example, 0.1mm to 5mm, preferably 0.1mm to 2 mm. In another embodiment, the number of cover sheets is one or more than three (not shown). In yet another embodiment, the cover sheet is not folded back (not shown).

[ absorbent body ]

Next, the absorbentmain body 10 will be explained with reference to fig. 1 to 4. Fig. 3 is a diagram showing a configuration example of theabsorbent body 14 of the embodiment, fig. 3 (a) is a plan view, fig. 3 (b) is a cross-sectional view taken along line IIIb-IIIb in fig. 3 (a), and fig. 4 is a schematic cross-sectional view showing a state in which the shape of theabsorbent body 14 before and after water absorption changes. In the present embodiment, theabsorbent body 10 has a substantially rectangular shape, and includes a liquid-permeable front sheet 12, a liquid-impermeable back sheet 13, and anabsorbent body 14 that is positioned between thefront sheet 12 and the back sheet 13 and absorbs and retains liquid. Examples of thetop sheet 12 include a liquid-permeable nonwoven fabric, a woven fabric, a synthetic resin film having liquid-permeable holes formed therein, and a composite sheet thereof. Examples of the back sheet 13 include liquid-impermeable nonwoven fabric, synthetic resin film, composite sheets thereof, and SMS nonwoven fabric. Theabsorbent body 14 in this embodiment includes an absorbent core for absorbing and retaining liquid and a core wrap sheet enclosing the absorbent core. Theabsorbent body 14 will be described in detail later. Theabsorbent body 14, thefront sheet 12, and the back sheet 13 are bonded together with an adhesive 51, and thefront sheet 12 and the back sheet 13 are bonded together with an adhesive 51 at their peripheral edge portions. The adhesive 51 is a material known in pants-type diapers, and examples thereof include a hot melt adhesive. The shape of the absorbentmain body 10 is not limited to the above example as long as it is long in the longitudinal direction L, and examples thereof include a rectangular shape with rounded corners, a rectangular shape with a short side being a curve protruding outward, and an hourglass shape. In another embodiment, the back sheet is omitted, and the non-skin side surface of the absorbent body and the non-skin side surface of the peripheral edge portion of the front sheet are joined to the cover sheet.

(skin-protective agent coating section)

In the present embodiment, the skin care agent application section 18 to which a skin care agent containing a skin care component is applied is provided on the skin-side surface of thetop sheet 12, and the skin care agent application section 18 is provided at a position not overlapping with the later-describedchannels 48 and 48 (low basis weight sections) in the thickness direction T. As shown in fig. 4, when theabsorbent body 14 absorbs water, the skin-side surface of theabsorbent body 14 is slightly concave in the region overlapping thechannels 48, 48 in the thickness direction T, and theabsorbent body 14 swells, and the distance from the skin-side surface of the absorbent body to theintermediate layer 43 and the No. 2base material 46 is smaller in the region overlapping thechannels 48, 48 in the thickness direction T than in the surroundings, but the skin care agent is not present in the region overlapping thechannels 48, 48 in the thickness direction, and therefore it is difficult for the skin care agent to soften the adhesive 51 in which the super absorbent polymer is fixed to the non-skin-side surface of the absorbent core (for example, the No. 2 base material 46) at thechannels 48, 48. In addition, in the regions adjacent to thechannels 48, the superabsorbent polymer is present in a higher weight per unit area than thechannels 48, and therefore the skin care agent hardly penetrates into the absorbent core, and it is difficult to soften the adhesive 51 that fixes the superabsorbent polymer to the non-skin side surface of the absorbent core. This makes it difficult for theabsorbent body 14 to deform even if the superabsorbent polymer swells after absorbing body fluid. After theabsorbent body 14 absorbs bodily fluids, the area around the absorbent body tends to bulge compared to thechannels 48, and the area around thechannels 48, 48 tends to come into contact with the skin surface of the wearer. Further, since the skin care agent does not overlap with thechannels 48, 48 in the thickness direction T, the skin care agent is likely to come into contact with the skin of the wearer after absorbing body fluid, and the skin care agent is likely to effectively act on the skin of the wearer. In the present embodiment, the skin care agent application section 18 is disposed on the skin side of thetopsheet 12, and the skin care agent is directly applied to the skin of the wearer, so that the skin care agent is likely to be more effectively applied to the skin of the wearer, and the skin care agent is disposed at a position away from the adhesive 51 to which the super absorbent polymer is fixed, so that the adhesive 51 is less likely to be softened, and theabsorbent body 14 is less likely to be deformed. In another embodiment, the pants-type diaper has a second sheet (not shown) between the topsheet and the absorbent body, and a skin care agent application section is provided in a position of the second sheet that does not overlap the channels in the thickness direction. In another embodiment, the skin care agent-applying section is provided on the skin side or non-skin side of the intermediate layer, in which case the absorbent core means the 2 nd water absorbent material, and the 1 st water absorbent material and the 1 st base material may be provided as additional absorbent cores on the skin side of the intermediate layer.

In this embodiment, the skin care agent comprises a skin care ingredient. In the present embodiment, examples of the skin care ingredients include water-soluble vitamins (e.g., vitamin B1, vitamin B2, vitamin B3, vitamin B5, vitamin B6, vitamin B7, vitamin B9, vitamin B12, and vitamin C), fat-soluble vitamins (e.g., vitamin A group, vitamin D group, vitamin E group, and vitamin K group), amino acids (e.g., alanine, arginine, lysine, histidine, proline, and hydroxyproline), peptides, pH regulators (e.g., malic acid, succinic acid, citric acid, tartaric acid, and lactic acid), plant extracts (e.g., peony, Scutellaria baicalensis, Hypericum erectum, Chamomile, Glycyrrhiza uralensis, peach leaf, mugwort, and perilla extract), drugs (e.g., skin astringents, anti-acne agents, anti-wrinkle agents, disinfecting, whitening agents, and fat-liquoring agents, Antibacterial agents, antimycotic agents, etc.). In addition, the skin care agent may also contain an oily base. As the oily base, a liquid, solid or gel-like oily base can be used, and examples thereof include fatty acid esters (e.g., triglycerides), natural oils (e.g., coconut oil, linseed oil, etc.), silicones (e.g., silicone oils, silicone-based resins, etc.), and hydrocarbons (e.g., paraffin). In another embodiment, the skin care agent contains a fragrance component, a cool feeling component such as menthol, and the like in addition to the skin care component described above, and thus the wearer of the pants-type diaper 1 can detect the presence of the skin care agent by sense of smell or skin feel.

(absorber)

Theabsorbent body 14 is a layer having liquid absorbing performance and liquid retaining performance, and in the present embodiment, theabsorbent body 14 includes an absorbent core that absorbs and retains liquid, and the absorbent core includes a core-covering sheet and a laminated absorbent core in which a 1 st waterabsorbent material 45, anintermediate layer 43, and a 2 nd waterabsorbent material 47 are laminated in this order from the skin side toward the non-skin side. In the present embodiment, the core wrap sheet is composed of the 1st base material 44 and the 2nd base material 46. In another embodiment, the absorber may not include the 1st base material 46. In the present embodiment, theabsorber 14 can be considered to include: a 1 stabsorbent layer 41 which is positioned on the skin side and comprises a 1 st waterabsorbent material 45 and a 1st base material 44; a 2 ndabsorbent layer 42 which is located on the non-skin side and comprises a 2 nd waterabsorbent material 47 and a 2nd base material 46; and anintermediate layer 43 located between the 1 st and 2 ndabsorbent layers 41, 42. In this case, theabsorbent body 14 may be regarded as having a two-layer structure in which the 1 stabsorbent layer 41, theintermediate layer 43, and the 2 ndabsorbent layer 42 are sequentially laminated in the thickness direction T. In another embodiment, the absorbent body has a single-layer structure in which the 1 st absorbent layer and the 2 nd absorbent layer are integrated in the thickness direction without theintermediate layer 43.

In the present embodiment, theabsorber 14 has a substantially rectangular planar shape extending in the longitudinal direction L. However, the shape is not particularly limited, and examples thereof include a rectangle having a short side projecting in an arc shape, a rounded rectangle, an ellipse, and an hourglass shape. The thickness of theabsorbent member 14 is, for example, 0.5mm to 20mm, preferably 1mm to 10 mm.

(the 1 st Water-absorbent Material)

In the present embodiment, the 1 stabsorbent layer 41 has the 1 st waterabsorbent material 45 which becomes a part of the laminated absorbent core as the absorbent core, and has the 1st base material 44 as the core wrap sheet. The 1st water absorbent 45 is fixed to theintermediate layer 43 with an adhesive 51 in at least a part of the surface of theintermediate layer 43 on the 1st substrate 44 side, and is not fixed to the surface of the 1st substrate 44 on theintermediate layer 43 side with the adhesive 51 on the surface of the 1st substrate 44 on theintermediate layer 43 side. In another embodiment, the 1 st water absorbent material is fixed to the intermediate layer and the 1 st base material with an adhesive in at least a part of the surface of the intermediate layer on the 1 st base material side and at least a part of the surface of the 1 st base material on the intermediate layer side. The water absorbing material of the 1 stwater absorbing material 45 is disposed in the 1st absorbing layer 41 with a substantially uniform basis weight. However, the weight per unit area of the end portions in the longitudinal direction L and/or the width direction W may be gradually reduced toward the edges. In another embodiment, the water-absorbing materials of the 1 st water-absorbing material are arranged in a predetermined distribution having sites with a greater weight per unit area and sites with a lesser weight within the 1 st absorbent layer. The 1 stwater absorbing material 45 has a substantially rectangular planar shape.

(the 2 nd Water-absorbent Material)

In the present embodiment, the 2 ndabsorbent layer 42 has the 2 ndwater absorbing material 47 which becomes a part of the laminated absorbent core as the absorbent core, and has the 2nd base material 46 as the core wrap sheet. The 2nd water absorbent 47 is fixed to the 2nd base material 46 with an adhesive 51 in at least a part of the surface of the 2nd base material 46 on theintermediate layer 43 side, and is not fixed to the surface of theintermediate layer 43 on the 2nd base material 46 side with the adhesive 51 on the surface of theintermediate layer 43 on the 2nd base material 46 side. In another embodiment, the 2 nd water absorbing material is fixed to the intermediate layer and the 2 nd base material with an adhesive in at least a part of the surface of the intermediate layer on the 2 nd base material side and at least a part of the surface of the 2 nd base material on the intermediate layer side. The absorbent material of the 2 ndabsorbent material 47 is disposed in the 2 ndabsorbent layer 42 with a substantially uniform basis weight except for the pair ofchannels 48, 48 (described later; low basis weight portion). However, the weight per unit area of the end portions in the longitudinal direction L and/or the width direction W may be gradually reduced toward the edges.

In the present embodiment, the dimension of the 2 nd waterabsorbent material 47 in the width direction W is larger than the maximum dimension of the 1 st waterabsorbent material 45 in the width direction W. In the present embodiment, the dimension of the 2 nd waterabsorbent material 47 in the longitudinal direction L is larger than the maximum dimension of the 1 st waterabsorbent material 45 in the longitudinal direction L. In this case, the 2 ndwater absorbing material 47 can also be regarded as having a substantially rectangular planar shape which is one turn larger than the 1 stwater absorbing material 45 in the width direction W and the length direction L. This makes it possible to increase the weight per unit area of the super absorbent polymer in the vicinity of the excretory opening contact portion, and to effectively absorb body fluid. Further, the weight per unit area of the super absorbent polymer is low at the edges in the longitudinal direction L and the width direction W of theabsorbent body 14, and therefore the fitting properties of the pants-type diaper 1 to the wearer are further improved. However, in another embodiment, the dimensions in the width direction W and the length direction L of the 2 nd absorbent member may be the same as the dimensions in the width direction W and the length direction L of the 1 st absorbent member, and in yet another embodiment, the dimensions in the width direction W and the length direction L of the 1 st absorbent member may be larger than the maximum dimensions in the width direction W and the length direction L of the 2 nd absorbent member.

In the present embodiment, the skin care agent application section 18, preferably the entire area of the skin care agent application section 18, is provided in an area that does not overlap thechannels 48, 48 in the thickness direction but overlaps the No. 2 waterabsorbent material 47 in the thickness direction T. That is, the skin care agent application section 18 is provided in a region overlapping with the highabsorption amount region 14a described later in the thickness direction T and excluding regions overlapping with thechannels 48, 48 in the thickness direction T. Therefore, the superabsorbent polymer has a higher basis weight in the region overlapping the skin-care agent-applied portion 18 in the thickness direction T than in the surrounding area, and therefore the skin-care agent is more likely to contact the wearer's skin, and the skin-care agent is likely to act more effectively on the wearer's skin.

(super absorbent Polymer)

The 1 stwater absorbing material 45 and the 2 ndwater absorbing material 47 contain Super Absorbent Polymers (SAP). The 1 stwater absorbing material 45 and the 2 ndwater absorbing material 47 contain 90 mass% or more of a super absorbent polymer with respect to the total amount of the water absorbing materials. The 1 st waterabsorbent material 45 and the 2 nd waterabsorbent material 47 may further include hydrophilic fibers such as pulp fibers and water absorbent fibers. Therefore, the 1 st waterabsorbent material 45 and the 2 nd waterabsorbent material 47 can be said to contain a super absorbent polymer as a main component, and theabsorbent body 14 can be said to be a so-called SAP sheet. The proportion of the super absorbent polymer to the absorbent body 14 (including not only the 1 st and 2 nd waterabsorbent materials 45 and 47 but also the adhesive 51, the 1st base material 44, theintermediate layer 43, and the 2 nd base material 46) is, for example, 40 to 80% by mass, preferably 50 to 80% by mass, and more preferably 60 to 80% by mass. In the present embodiment, the 1 st waterabsorbent material 45 and the 2 nd waterabsorbent material 47 are composed of only a super absorbent polymer and do not contain hydrophilic fibers. In another embodiment, the 1 st and 2 nd water-absorbing materials contain pulp fibers and/or water-absorbing fibers in addition to the super absorbent polymer.

In addition, when determining the content of the super absorbent polymer in theabsorbent body 14 and the 1 st and 2 nd waterabsorbent materials 45 and 47, theabsorbent body 14 may be hollowed out in the thickness direction by a predetermined area, and if necessary, heat or the like may be applied to soften the adhesive 51, the nonwoven fabric, the adhesive 51, the super absorbent polymer, pulp fibers, and the like constituting each layer may be separated, the weight of each component may be measured, the weight per unit area of each component may be obtained, and the content of the super absorbent polymer may be determined based on the calculated weight per unit area. The water-absorbent material is a polymer absorbent material represented by a super absorbent polymer, pulp fiber, and water-absorbent fiber.

The super absorbent polymer is not particularly limited as long as it can absorb and retain water, and examples thereof include granular or fibrous super absorbent polymers. The weight per unit area of the super absorbent polymer of the 1 st waterabsorbent material 45 can be appropriately adjusted according to the absorption performance required of the pants-type diaper 1, and is, for example, 10g/m²～500g/m²Preferably 40g/m²～400g/m²More preferably 100g/m²～400g/m². The weight per unit area of the super absorbent polymer of the 2 nd waterabsorbent material 47 can be appropriately adjusted according to the absorption performance required of the pants-type diaper 1, and is, for example, 10g/m²～500g/m²Preferably 40g/m²～400g/m²More preferably 100g/m²～400g/m². The 1 st waterabsorbent material 45 and theThe water-absorbent material 47 may have a larger weight per unit area than the other, or may have the same weight per unit area. Wherein, the same means that one is in the range of 100% + -30% of the other.

Examples of the super absorbent polymer include starch-based, cellulose-based, and synthetic polymer-based polymeric absorbents. Examples of the starch-based or cellulose-based super absorbent polymer include a starch-acrylic acid (salt) graft copolymer, a saponified product of a starch-acrylonitrile copolymer, and a crosslinked product of sodium carboxymethylcellulose. Examples of the synthetic polymer-based super absorbent polymer include polyacrylate-based, polysulfonate-based, maleic anhydride-based, polyacrylamide-based, polyvinyl alcohol-based, polyethylene oxide-based, polyaspartate-based, polyglutamate-based, polyalphamate-based, starch-based, and cellulose-based polymers. In the present embodiment, a polyacrylate-based (particularly, sodium polyacrylate-based) super absorbent polymer is preferable. In the present embodiment, it is preferable that 90 to 100 mass% of the superabsorbent polymer in theabsorbent body 14 is composed of superabsorbent polymer particles having a particle diameter of 150 to 500 μm. The superabsorbent polymer particles having such a particle size distribution have a small and uniform particle size and are therefore easily retained in the adhesive 51. The particle diameter of the super absorbent polymer particles is measured in accordance with JIS R6002: the screening test method described in 1998 was standard.

(channel)

In the present embodiment, theabsorber 14 has a pair ofchannels 48, 48 extending along the longitudinal direction L. In the present embodiment, a pair ofpassages 48, 48 are provided in the 2 nd waterabsorbent material 47. That is, in thepassages 48, the basis weight of the superabsorbent polymer of the 2nd absorbent 47 is lower than the basis weight of the superabsorbent polymer of the 2nd absorbent 47 around thepassages 48, and the basis weight of the superabsorbent polymer of the 1 st absorbent 45 in thepassages 48, 48 is equal to the basis weight of the superabsorbent polymer of the 1 st absorbent 45 around thepassages 48, 48. With such a configuration, the skin care agent applied to thetop sheet 12 is less likely to penetrate into the absorbent core, and theabsorbent body 14 is less likely to lose its shape after absorption of body fluid. The pair ofpassages 48, 48 are strip-shaped regions extending along the longitudinal direction L and arranged at predetermined intervals on both sides in the width direction W with the longitudinal center line CL therebetween. Thechannel 48 is formed at least in the center portion in the longitudinal direction L across the width direction center line CW. In another embodiment, the channel is formed to reach at least one of both end edges in the longitudinal direction L. The pattern of the pair ofpassages 48, 48 in plan view is, for example, a pattern formed so that the interval between the two is constant along the longitudinal direction L. In another embodiment, the pattern of the pair of channels is formed such that the interval between the channels is narrower near the center in the longitudinal direction L and expands toward both outer sides in the longitudinal direction L, for example. Here, thechannels 48 are regions (low basis weight portions) in which the basis weight of the super absorbent polymer is lower than the regions around the channels of theabsorbent body 14, and for example, regions in which the basis weight of the super absorbent polymer is smaller than the regions around thechannels 48 of the 2 ndabsorbent layer 42, including the case where the basis weight is zero. Thechannels 48 are formed in such a manner that the 2nd base material 46 is recessed toward theintermediate layer 43 side, that is, the 2 ndwater absorbing material 47 is recessed toward theintermediate layer 43 side. In another embodiment, the 2 nd water absorbent material is formed so as to be recessed toward the 2 nd base material side. The pair ofpassages 48, 48 overlaps the pair of heat-seal lands 43c, 43c in the thickness direction T. In another embodiment, at least a part of the passage does not overlap with the heat-seal lands 43c in the thickness direction T. In addition, in another embodiment, the channels do not extend in the length direction L but in the width direction W, or extend not only in the length direction L but also in the width direction W. In yet another embodiment, the channel is one or more than three. In yet another embodiment, the 2 nd absorbent material does not have a pair ofchannels 48, 48 and the 1 st absorbent material does have a pair of channels.

(intermediate layer)

As described above, in the present embodiment, theabsorbent body 14 includes theintermediate layer 43. Thus, even after the absorption of body fluid, theintermediate layer 43 easily maintains the structure of the absorbent core, and theabsorbent body 14 is less likely to have a shape change. This further improves the fit of the pants-type diaper 1 after absorption of body fluids. Theintermediate layer 43 is a liquid-permeable sheet having a substantially rectangular planar shape. In the present embodiment, theintermediate layer 43 includes anupper layer 43a and a pair oflower layers 43b, 43b adjacent to each other on both sides in the width direction W of the non-skin side surface of theupper layer 43 a. Theintermediate layer 43 is formed by folding back and overlapping a pair of side portions located on both sides of a central portion in the width direction W toward the non-skin side of the central portion in a sheet member having a substantially rectangular planar shape. At this time, the central portion of the sheet member becomes theupper layer 43a, and the pair of side portions of the sheet member becomes the pair oflower layers 43b, 43 b. Therefore, both sides of theintermediate layer 43 in the width direction W have a two-layer structure in which theupper layer 43a and thelower layer 43b are stacked, and have a substantially rectangular shape extending in the longitudinal direction L. The portion 43d in the vicinity of the center of theintermediate layer 43 in the width direction W has a single-layer structure of only theupper layer 43a, and has a substantially rectangular shape extending in the longitudinal direction L. Theupper layer 43a and thelower layer 43b of the two-layer structure are joined by a pair of heat-seal portions 43c, 43c extending in the longitudinal direction L on both sides in the width direction W of the portion 43 d. The heat-seal lands 43c are formed by heating and compressing. In another embodiment, the upper and lower layers of the two-layer structure are joined by embossed portions extending along the longitudinal direction L on both sides in the width direction W of a portion in the vicinity of the center in the width direction W. The embossed portion is formed by compression. In another embodiment, the heat-seal land and the embossed land have a shape of a plurality of dots, a plurality of curves, or a pattern. Both end edges in the width direction W of theintermediate layer 43 are sandwiched and bonded to both end portions in the width direction W of the 1st base material 44 and the 2nd base material 46, and both end edges in the length direction L of theintermediate layer 43 are sandwiched and bonded to both end portions in the length direction L of the 1st base material 44 and the 2nd base material 46. In another embodiment, both end edges in the longitudinal direction L are not sandwiched between both end portions in the longitudinal direction L of the 1 st base material and the 2 nd base material, and are not joined. By adopting the double-layer structure, the liquid can be stored temporarily, and the time required for the super absorbent polymer to absorb can be easily ensured.

As theintermediate layer 43, for example, the 1 st substrate can be used44 of the same sheet material. The weight per unit area of theintermediate layer 43 is, for example, 10g/m²～100g/m²Preferably 15g/m²～80g/m². The thickness of theintermediate layer 43 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm. In the present embodiment, theintermediate layer 43 is a hot-air nonwoven fabric. In general, a through-air nonwoven fabric is a nonwoven fabric in which interweaved portions between fibers are thermally fused together, and has high mechanical strength. Therefore, theintermediate layer 43, which is a hot air non-woven fabric, has a certain resistance against a load from the outside, and easily maintains the shape of theabsorbent body 14, and after absorption of body fluid, theabsorbent body 14 is less likely to be deformed, and thus the fit of the pants-type diaper 1 after absorption of body fluid is improved. In another embodiment, the intermediate layer is a nonwoven air-through fabric having hydrophilicity and liquid permeability and formed of thermoplastic synthetic fibers. In this case, liquid permeability can be ensured even when the absorbent body absorbs water.

In the present embodiment, a sheath-core conjugate fiber is used as the fiber constituting the hot-air non-woven fabric, and a thermoplastic resin is used as at least a sheath component constituting the fiber surface in the sheath-core conjugate fiber. By using a thermoplastic resin as the sheath component constituting the fiber surface, the fiber exhibits thermal fusion characteristics, and therefore the resin component used as the core component can be appropriately selected in accordance with the desired physical properties of theintermediate layer 43. For example, as the sheath-core conjugate fiber, a conjugate fiber using a resin component having relatively high strength as a core component not constituting the fiber surface can be used, and thus an intermediate layer having more stable resistance against tensile stress and the like can be provided. Examples of the resin that can be used as the core component and the sheath component include polyolefins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, and ionomer resin; polyesters such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, and polylactic acid; polyamides such as nylon and the like are appropriately selected and used in combination. In the present embodiment, for the purpose of achieving both the heat-sealing property and the tensile strength, it is preferable to use a polyolefin resin such as polyethylene or polypropylene as the sheath component, and it is preferable to use the above-mentioned polyolefin resin or a polyester resin such as polyethylene terephthalate as the core component. However, theintermediate layer 43 is not limited to the air-through nonwoven fabric, and may be a liquid-permeable sheet.

In the present embodiment, as shown in fig. 3, theabsorber 14 includes a back-side region BA, a stomach-side region FA, and a crotch region MA which are arranged in the longitudinal direction L. Here, the back-side area BA is an area of theabsorbent body 14 that overlaps with the back-side portion 3 in the thickness direction T. The abdomen-side region FA is a region of theabsorbent body 14 that overlaps the abdomen-side portion 2 in the thickness direction T. The crotch region MA is a region located between the back-side region BA and the stomach-side region FA of theabsorber 14, i.e., a region overlapping thecrotch portion 4 in the thickness direction T. Thus, theabsorber 14 is divided into a back-side region BA overlapping the back-side portion 3, a stomach-side region FA overlapping the stomach-side portion 2, and a crotch region MA overlapping thecrotch portion 4 along the longitudinal direction L.

(high absorption region, low absorption region, non-arrangement region)

In the present embodiment, theabsorber 14 includes a highabsorption amount region 14a, a lowabsorption amount region 14b, and anon-arrangement region 14 c. The highabsorption amount region 14a is a region where the 1st absorption layer 41 and the 2nd absorption layer 42 overlap in the thickness direction T. The lowabsorption amount region 14b is a region where the 1st absorption layer 41 is not present and only the 2nd absorption layer 42 is present in the thickness direction T. Thenon-arrangement region 14c is a region not containing the super absorbent polymer, and is a region where the 1st absorption layer 41 and the 2nd absorption layer 42 are not present in the thickness direction T. The term "not containing a super absorbent polymer" includes the case where the weight per unit area of the super absorbent polymer is very small although the super absorbent polymer is present. "very small" means that the weight per unit area of the super absorbent polymer is 5% or less of the weight per unit area of the super absorbent polymer in thehigh absorption region 14 a. The highabsorption amount region 14a, the lowabsorption amount region 14b, and thenon-arrangement region 14c have a substantially rectangular shape. However, the shape is not particularly limited, and examples thereof include a rectangle having a short side projecting in an arc shape, a rounded rectangle, an ellipse, and an hourglass shape. In addition, the lowabsorption amount region 14b is a region that surrounds the periphery (surrounds at least three sides) of the highabsorption amount region 14a in a substantially frame shape in the longitudinal direction L and the width direction W in a plan view, and the outer dimension of the lowabsorption amount region 14b is 5% to 25% larger than the outer dimension of the highabsorption amount region 14 a. Thenon-arrangement region 14c is a region surrounding thelow absorption region 14b in a substantially frame shape, and the outer dimension of thenon-arrangement region 14c is 3% to 15% larger than the outer dimension of thelow absorption region 14 b. The weight per unit area of thelow absorption region 14b is, for example, 40% to 60% of the weight per unit area of thehigh absorption region 14a, and the weight per unit area of thenon-arrangement region 14c is, for example, 0% to 5% of the weight per unit area of thehigh absorption region 14 a. In the case where theabsorbent body 14 is a single layer having no 1 stabsorbent layer 41 and no 2 ndabsorbent layer 42, and is difficult to be divided into two regions, the high absorption amount region is a region in which the thickness of the water absorbent material (including the adhesive 51) is in a range from the maximum value to 50% of the maximum value. The low basis weight portion is a region in which the thickness of the water absorbent material (including the adhesive 51) is in the range from 50% to 5% of the maximum value, and the non-arrangement region is a region in which the thickness of the water absorbent material (including the adhesive 51) is in the range from 5% to 0% of the maximum value. The thickness is an arithmetic average height (Ra: JIS B0601-2001).

Thus, in theabsorber 14, the back-side area BA includes a back-side high absorption amount region BAa as the highabsorption amount region 14a, a back-side low absorption amount region BAb as the lowabsorption amount region 14b, and a back-side non-arrangement region barc as thenon-arrangement region 14 c. In addition, in theabsorbent body 14, the abdominal-side region FA includes an abdominal-side high absorption region FAa as thehigh absorption region 14a and an abdominal-side non-disposition region FAc as thenon-disposition region 14 c. In addition, the crotch region MA has only the highabsorption amount region 14 a. Therefore, the basis weight of the superabsorbent polymer in the back-side high-absorption region BAa and the stomach-side high-absorption region FAa is equivalent to the basis weight of the superabsorbent polymer in the crotch region MA. "equivalent" means that one is in the range of 0.7 to 1.3 times (100% ± 30%) the other. In another embodiment, the abdominal-side region includes an abdominal-side low absorption region as the low absorption region in addition to the abdominal-side high absorption region and the abdominal-side non-disposition region.

Here, the 2 ndabsorbent layer 42 includes a protruding portion protruding outward from the end edge of the 1 stabsorbent layer 41 at the rear end in the longitudinal direction L in a plan view. The protruding portion includes the back-side low absorption amount region BAb, and in the present embodiment, the protruding portion is the same as the back-side low absorption amount region BAb. The 2nd absorption layer 42 is covered with theintermediate layer 43, and thus the skin side of the protruding portion, i.e., the back-side low absorption amount region BAb, is covered with theintermediate layer 43 and the 1st base material 44. In the present embodiment, the 2 ndabsorbent layer 42 includes, in a plan view, widthwise protruding portions protruding outward from the end edges of the 1 stabsorbent layer 41 at both ends in the widthwise direction L. The skin side of the widthwise protruding portion is covered with theintermediate layer 43 and the 1st base material 44. In another embodiment, the 2 nd absorbent layer includes another protruding portion protruding outward from the end edge of the 1 st absorbent layer at the front end portion in the longitudinal direction L in a plan view. The other protrusion includes a ventral low absorbent capacity region. In yet another embodiment, the skin side of the protrusion, i.e. the back side low absorption area, is covered by either the middle layer or the 1 st substrate, but not the other. In still another embodiment, the 2 nd absorbent layer does not include a width direction protruding portion protruding outward from the end edge of the 1 st absorbent layer at both side end portions in the width direction W in a plan view.

(core cladding sheet)

As described above, theabsorbent body 14 has the 1st base material 44 and the 2nd base material 46 as the core wrap sheet.

The 1st base material 44 has a substantially rectangular planar shape, and covers the 1 stabsorbent material 45 from the skin side in plan view, and the peripheral edge portion of the 1st base material 44 extends slightly outward from the periphery of the 1 stabsorbent material 45. The 2nd base material 46 has a substantially rectangular planar shape, and covers the 2 ndabsorbent material 47 from the non-skin side in plan view, and the peripheral edge portion of the 2nd base material 46 extends slightly outward from the periphery of the 2 ndabsorbent material 47. At this time, both end portions in the width direction W of the 2nd base material 46 cover both side surfaces of the 2 nd waterabsorbent material 47, and cover skin-side surfaces of both end portions in the width direction W of the 1st base material 44. That is, on the skin-side surface of the end portion in the width direction W of the 1 stabsorbent layer 41, the end portion in the width direction W of the 2nd base material 46 and the end portion in the width direction W of the 1st base material 44 are overlapped and joined.

As described above, the both end portions in the width direction W of the 2nd base 46 cover the side surfaces in the width direction W of the 2nd water absorbent 47 and the side surfaces in the width direction W of the 1st base 44, whereby the 2nd water absorbent 47 is enclosed in the 2 ndabsorbent layer 42 in the width direction W and the 1st water absorbent 45 is enclosed in the 1 stabsorbent layer 41 in the width direction W. In another embodiment, both ends in the width direction W of the 1 st base material cover the side surfaces in the width direction W of the 1 st absorbent material, and cover the side surfaces in the width direction W of the 2 nd base material. In another embodiment, the 1 st base material, the intermediate layer, and the 2 nd base material are laminated and joined in the thickness direction T at both ends in the width direction W.

In the present embodiment, the 1st base material 44, theintermediate layer 43, and the 2nd base material 46 are laminated and joined in the thickness direction T at both ends in the longitudinal direction L of theabsorbent body 14. Thus, the 1 st waterabsorbent material 45 is enclosed in the 1 stabsorbent layer 41 by the 1st base material 44 and theintermediate layer 43 in the longitudinal direction L, and the 2 nd waterabsorbent material 47 is enclosed in the 2 ndabsorbent layer 42 by the 2nd base material 46 and theintermediate layer 43 in the longitudinal direction L. In another embodiment, both ends of the absorbent body in the longitudinal direction L are not covered with the 1 st base material and the 2 nd base material. In another embodiment, the absorbent body does not include the 1 st base material.

(1 st base material)

The 1st base material 44 is not particularly limited as long as it is a liquid-permeable sheet. Examples of the 1st substrate 44 include a liquid-permeable nonwoven fabric, a hydrophilic nonwoven fabric, and a laminated nonwoven fabric thereof, and among them, a nonwoven fabric having high water permeability is preferable. Examples of the nonwoven fabric include a spunbond nonwoven fabric and a through-air nonwoven fabric formed of polyolefin fibers such as Polyethylene (PE) and polypropylene (PP), polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) and polyethylene naphthalate (PEN), and a combination thereof. These fibers are preferably in a known mannerThe method performs hydrophilization treatment. Alternatively, for example, an air-laid nonwoven fabric in which hydrophilic fibers such as pulp fibers and rayon fibers are coated with a hydrophilic binder, and a spunlace nonwoven fabric in which the hydrophilic fibers and the synthetic fibers are combined may be mentioned. In the present embodiment, an air-laid nonwoven fabric having liquid permeability and liquid retention properties, in which pulp fibers are coated with a hydrophilic binder, is used. Further, as the 1st base material 44, one kind or plural kinds of the above nonwoven fabrics may be laminated in plural. The weight per unit area of the 1st substrate 44 is, for example, 10g/m²～100g/m²Preferably 20g/m²～80g/m². The thickness of the 1st substrate 44 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.

(2 nd base material)

The 2nd substrate 46 is not particularly limited as long as it is a sheet having water retentivity and liquid diffusibility. The fibers constituting the 2nd substrate 46 include water-absorbent fibers, and the sheet having water retentivity and liquid diffusibility includes a water-absorbent nonwoven fabric. Thus, the 2nd base material 46 easily diffuses the body fluid in the longitudinal direction L and the width direction W, and the 2 nd water-absorbent material 47 uniformly absorbs water, so that theabsorbent body 14 is less likely to be deformed. Examples of the water-absorbent fibers include synthetic fibers such as polyamide fibers, regenerated fibers such as rayon fibers and acetate fibers, and natural fibers such as cotton, silk, hemp and pulp (cellulose) fibers, and examples of the water-absorbent nonwoven fabric formed of the water-absorbent fibers include a nonwoven fabric formed using only 1 type of the water-absorbent fibers described above, or a nonwoven fabric formed by combining a plurality of types of the water-absorbent fibers. Specifically, for example, a spunbonded nonwoven fabric containing nylon and a spunlace nonwoven fabric containing rayon fibers and/or pulp fibers can be cited. Since spunlace nonwoven fabrics and spunbond nonwoven fabrics containing water-absorbent fibers are excellent in the diffusion of body fluid in the longitudinal direction L and the width direction W, theabsorbent body 14 uniformly swells in the longitudinal direction L and the width direction W when absorbing body fluid, and theabsorbent body 14 is less likely to have a shape running. Hydroentangling with rayon and/or pulp fibersThe nonwoven fabric may contain polyolefin fibers and/or polyester fibers. In the present embodiment, a spunlace nonwoven fabric containing rayon fibers and pulp fibers, which has liquid retention and liquid diffusion properties, is used. Further, as the 2nd base material 46, one kind or plural kinds of the above nonwoven fabrics may be laminated in plural. The weight per unit area of the 2nd substrate 46 is, for example, 10g/m²～200g/m²Preferably 35g/m²～150g/m². The thickness of the 2nd substrate 46 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.

In another embodiment, the 1 st base material and the 2 nd base material may be both sheets having water retentivity and liquid diffusibility, or the 1 st base material and the 2 nd base material may be both sheets having liquid permeability.

(adhesive 51)

The adhesive 51 applied to the 1st substrate 44, theintermediate layer 43, and the 2nd substrate 46 is not particularly limited as long as it can fix the super absorbent polymer to the adhesive 51, and examples thereof include a hot melt adhesive. The pattern of the adhesive 51 to be applied is not particularly limited, and examples thereof include a continuous or intermittent Ω pattern, a spiral pattern, and a line pattern. The weight per unit area of the adhesive 51 can be appropriately adjusted so as not to significantly reduce the liquid absorbency of theabsorbent body 14, and for example, the weight per unit area of each layer of adhesive is 3g/m²～50g/m². Each layer is a layer of the adhesive 51 between the 1 st waterabsorbent material 45 and the 1st base 44, a layer of the adhesive 51 between the 1 st waterabsorbent material 45 and theintermediate layer 43, a layer of the adhesive 51 between the 2 nd waterabsorbent material 47 and the 2nd base 46, and a layer of the adhesive 51 between the 2 nd waterabsorbent material 47 and theintermediate layer 43.

(leakage-proof wall)

In the present embodiment, the surface of the absorbentmain body 10 on the skin side includes a pair ofside sheets 17 and 17 located on both sides in the width direction W and extending in the longitudinal direction L. Eachside sheet 17 has aleakage preventing wall 16 andfastening regions 15, 15. Thefastening regions 15, 15 are positioned at the front and rear ends of theside sheet 17 in the longitudinal direction L and are fastened to the skin-side surface of the absorbentmain body 10. Theleakage preventing wall 16 is positioned between the front andrear fixing regions 15, 15 in the longitudinal direction L of theside sheet 17, is adjacent thereto, and is fixed at the outer end edge in the width direction W of theleakage preventing wall 16 on the skin-side surface of the absorbentmain body 10, and is non-fixed at the inner end edge in the width direction W of theleakage preventing wall 16. In this case, theleakage preventing walls 16 and thefastening regions 15, 15 are formed by, for example, inner portions of theside sheets 17 in the width direction W, and outer portions of theside sheets 17 in the width direction W are fastened to the absorbentmain body 10. In this manner, the absorbentmain body 10 includes the pair ofleakage preventing walls 16, 16. The pair ofleakage preventing walls 16, 16 are disposed so as to face each other at both end portions in the width direction W on the skin side of the absorbentmain body 10, and extend continuously along the longitudinal direction L. Each of theleakage preventing walls 16 includes two elastic members 61 for leakage preventing walls extending in the longitudinal direction L at inner ends in the width direction W. The elastic member 61 for the leakage preventing wall is exemplified as a rubber band. In another embodiment, the pair of leakage preventing walls each further folds back an inner end portion in the width direction W to an outer side in the width direction W. In another embodiment, the number of the elastic members for the leakage preventing wall is one or more than three. The pair ofleakage preventing walls 16, 16 are each formed of a hydrophobic sheet, such as a hydrophobic nonwoven fabric. In another embodiment, it is formed of a hydrophilic sheet, such as a hydrophilic nonwoven fabric.

[ leg gather ]

In the present embodiment, the pants-type diaper 1 includes a plurality of leg gatherelastic members 8 for leg gathers from thecrotch portion 4 to theback portion 3 and the abdomen portion 2. The plurality of leg gatherelastic members 8 extend mainly in the longitudinal direction L at both ends in the width direction W of thecrotch portion 4. The plurality of leg gatherelastic members 8 are for stretching and contracting the pair of leg openings, respectively, and are exemplified by rubber bands.

[ waist gather ]

In the present embodiment, the abdomen-side portion 2 is provided with a plurality ofelastic members 6a, 6b for waist gather between the covering sheet 5a and the covering sheet 5b, and the back-side portion 3 is provided with a plurality ofelastic members 7a, 7b for waist gather between the covering sheet 5a and the covering sheet 5 b. The plurality ofelastic members 6a and 6b are disposed inside and outside the abdominal portion 2 in the longitudinal direction L. The plurality ofelastic members 6a are arranged in the longitudinal direction L along the width direction W in predetermined regions on both sides across the longitudinal center line CL at intervals. The predetermined region is a region from theend portion 2a to a portion inside an end edge of the absorbentmain body 10 in the width direction W opposed to theend portion 2 a. The plurality ofelastic members 6b extend from the oneend portion 2a to theother end portion 2a in the width direction W, and are arranged at intervals in the longitudinal direction L. Similarly, the plurality ofelastic members 7a and 7b are disposed inside and outside theback portion 3 in the longitudinal direction L. The plurality ofelastic members 7a are arranged in the longitudinal direction L along the width direction W in predetermined regions on both sides across the longitudinal center line CL at intervals from each other. The predetermined region is a region from theend portion 3a to a portion inside an end edge of the absorbentmain body 10 in the width direction W opposed to theend portion 3 a. The plurality ofelastic members 7b extend from the oneend portion 3a to theother end portion 3a in the width direction W and are arranged at intervals in the longitudinal direction L. The plurality ofelastic members 6a, 6b, 7a, and 7b are for extending and contracting the waist opening, and are exemplified by rubber bands. The abdomen-side portion (abdomen-side waistband) 2 and the back-side portion (back-side waistband) 3 may be defined by a range in the longitudinal direction L in which the plurality ofelastic members 6a, 6b, 7a, 7b are arranged.

Next, a method for producing theabsorbent body 14 will be described.

First, the sheet for the 2nd substrate 46 is moved in the longitudinal direction L, and the hot melt adhesive is applied onto the sheet for the 2nd substrate 46. Next, a super absorbent polymer was sprayed from a super absorbent polymer supply device onto both end portions and a central portion in the width direction W of the sheet for the 2nd substrate 46 coated with the hot melt adhesive along the length direction L, respectively. At this time, a small amount of the super absorbent polymer is transferred to the region (corresponding to the channel) between the both end portions and the central portion. Next, a sheet for theintermediate layer 43 coated with hot melt adhesive on both sides was laminated on the super absorbent polymer on the sheet for the 2nd substrate 46. Next, the laminate was moved in the longitudinal direction L, and a super absorbent polymer was sprayed from another super absorbent polymer supply device in the longitudinal direction L onto the central portion in the width direction W of the sheet for theintermediate layer 43 coated with the hot melt adhesive. Next, the sheet for the 1st substrate 44 coated with the hot melt adhesive was laminated on the super absorbent polymer on the sheet for theintermediate layer 43 so that the hot melt adhesive was located on the super absorbent polymer side. Then, both side portions in the width direction W of the sheet for the 2nd base material 46 were folded back onto both side portions in the width direction W of the sheet for the 1st base material 44 to obtain a laminate. After that, the thickness of the laminate is adjusted by passing the laminate through a pair of press rolls, i.e., pressing, to obtain theabsorbent body 14.

Next, a method for manufacturing a pants-type diaper using theabsorbent body 14 will be described.

A liquid-permeable top sheet 12 coated with a skin care agent is attached to the top surface (surface of the 1 st base 44) of theabsorbent body 14 produced as described above, and a liquid-impermeable back sheet 13 is attached to the bottom surface (surface of the 2 nd base 46) of theabsorbent body 14, thereby obtaining a laminate. Next, theside sheets 17 with theleakage preventing walls 16 are attached to both sides in the width direction W of the laminate to obtain the absorbentmain body 10. Thereafter, theabsorbent body 10 is attached to the cover sheet 5 (including the elastic members 6, 7, and 8), and bothends 2a and 2a in the width direction W of the abdomen-side portion 2 and bothends 3a and 3a in the width direction W of the back-side portion 3 are joined. Thereby, the pants-type diaper 1 is manufactured.

The pants-type diaper of the present invention and the absorber thereof are not limited to the above-described embodiments, and known techniques can be applied by combining the embodiments without departing from the object and spirit of the present invention.

Claims (7)

1. An absorbent article comprising a front sheet, a back sheet, and an absorbent body disposed between the front sheet and the back sheet, the absorbent article having a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other,

the absorbent body comprising at least an absorbent core and a core wrap sheet covering at least the non-skin side of the absorbent core,

the absorbent core contains 90 mass% or more of a super absorbent polymer with respect to the total amount of the absorbent material,

the superabsorbent polymer is secured to the core wrap sheet on at least the non-skin side of the absorbent core with an adhesive,

the absorbent core is provided with a low unit area weight part which extends along the length direction and has a lower unit area weight of the super absorbent polymer than the surrounding,

the member located on the skin side of the absorbent core has a skin care agent coating section coated with a skin care agent containing a skin care ingredient,

the skin care agent-coated portion and the low basis weight portion do not overlap in the thickness direction.

2. The absorbent article of claim 1,

the skin care agent application section is provided on the skin side of the topsheet.

3. The absorbent article according to claim 1 or 2, wherein,

the absorbent core is a laminated absorbent core in which a 1 st water absorbent material containing the super absorbent polymer, an intermediate layer, and a 2 nd water absorbent material containing the super absorbent polymer are laminated in this order from the skin side toward the non-skin side.

4. The absorbent article according to claim 3,

the middle layer is hot air non-woven fabric.

5. The absorbent article according to claim 3,

the dimension of the 2 nd water absorbent material in the longitudinal direction is larger than the maximum dimension of the 1 st water absorbent material in the longitudinal direction, and the dimension of the 2 nd water absorbent material in the width direction is larger than the maximum dimension of the 1 st water absorbent material in the width direction.

6. The absorbent article according to claim 5,

the skin care agent-coated portion overlaps with the 2 nd water absorbent material in the thickness direction.

7. The absorbent article according to claim 3,

in the 2 nd water-absorbent material, the weight per unit area of the superabsorbent polymer in the low weight-per-unit-area portion is lower than the weight per unit area of the superabsorbent polymer in the periphery of the low weight-per-unit-area portion,

in the 1 st water-absorbent material, the weight per unit area of the superabsorbent polymer in the low weight-per-unit-area portion is equal to the weight per unit area of the superabsorbent polymer in the periphery of the low weight-per-unit-area portion.

Images