CN101166858B - Stretchable sheet and its manufacturing method - Google Patents

Abstract

A process for stretch sheet production which comprises stretching either a strip-form layered sheet (10A) comprising an elastic layer (1) having elastic stretchability and non-elastic fibrous layers (2) and (3) which are substantially non-elastic and have been partly bonded to the elastic layer (1) or a fibrous sheet comprising an elastic ingredient and a substantially non-elastic ingredient and partly having embossed parts formed by embossing. The stretching is conducted using the bonding parts (4) where the two kinds of layers are bonded to each other or the embossed parts, as base points. Thus, a stretch sheet (10) is obtained. The stretch sheet has protrusions and grooves extending in the direction perpendicular to the stretching direction, the bonding parts (4) or embossed parts being formed in the protrusions.

Description

Translated fromChinese

伸缩性片材及其制造方法Stretchable sheet and its manufacturing method

技术领域technical field

本发明涉及伸缩性片材的制造方法、层叠片材或纤维片材的拉伸方法以及伸缩性片材。 The present invention relates to a method for producing a stretchable sheet, a method for stretching a laminated sheet or a fiber sheet, and a stretchable sheet. the

背景技术Background technique

已知一种将具有弹性收缩性的片材与实质上为非弹性的片材进行部分结合后施以拉伸加工以获得伸缩性片材的方法。例如，在EP0556749A1中记载了下述弹性复合体的制造方法：将缓和状态的片材状弹性体和具有与该弹性体相同的伸长性但不具有伸长回复性的片材状基材在长度方向(MD)上连续地、在宽度方向(CD)上不连续地结合，形成弹性复合体后，在不发生基材的截断、破坏的范围内拉伸该弹性复合体至拉伸界限，使基材产生永久变形后，使拉伸缓和。 A method is known in which an elastically shrinkable sheet is partially bonded to a substantially inelastic sheet, and then stretched to obtain a stretchable sheet. For example, EP0556749A1 describes a method for producing an elastic composite: a sheet-like elastic body in a relaxed state and a sheet-like base material having the same extensibility as the elastic body but without elongation recovery Continuously in the longitudinal direction (MD) and discontinuously combined in the width direction (CD) to form an elastic composite, stretch the elastic composite to the limit of stretching within the range where the substrate is not cut off or damaged, After permanently deforming the base material, the stretching is relaxed. the

但是，在上述以往的伸缩性片材的制造方法中，根据拉伸的程度不同，有可能发生部分结合的2张片材之间在拉伸加工时剥离、所制造的伸缩性片材的拉伸强度不充分、或者发生起毛或破坏、或者手感和外观变差。为了防止这种不良状况，考虑了抑制拉伸加工时的伸长率等，但此种情况下难以获得高伸缩性的片材。 However, in the above-mentioned conventional method for producing stretchable sheets, depending on the degree of stretching, there is a possibility that two partially bonded sheets may be peeled off during the stretching process, and the stretchable sheet produced may be stretched. The tensile strength is insufficient, or fuzzing or breakage occurs, or the texture and appearance are deteriorated. In order to prevent such a problem, it is conceivable to suppress elongation during stretching, but it is difficult to obtain a highly stretchable sheet in this case. the

发明内容Contents of the invention

本发明提供一种伸缩性片材的制造方法，其中，将含有具有弹性伸缩性的弹性层和实质上为非弹性的非弹性纤维层，且上述两层进行部分接合而成的层叠片材以上述两层彼此的接合部为基点进行拉伸，从而获得伸缩性片材(以下提到第1发明时是指该发明)。 The present invention provides a method for producing a stretchable sheet, wherein a laminated sheet comprising an elastic layer having elastic stretchability and a substantially non-elastic non-elastic fiber layer, wherein the two layers are partially bonded, is A stretchable sheet is obtained by stretching the joined portion of the above-mentioned two layers as a base point (hereinafter, when the first invention is referred to, it refers to this invention). the

另外，本发明还提供一种伸缩性片材的制造方法，其中，将含有弹 性成分和实质上为非弹性的成分，且形成有通过压花加工产生的部分压花部的纤维片材以上述压花部为基点进行拉伸，从而获得伸缩性片材(以下提到第2发明时是指该发明)。 In addition, the present invention also provides a method for producing a stretchable sheet, wherein a fibrous sheet containing an elastic component and a substantially inelastic component and having a partially embossed portion formed by embossing is used as The above-mentioned embossed portion is stretched as a base point to obtain a stretchable sheet (hereinafter, when referring to the second invention, it refers to this invention). the

另外，本发明还提供一种伸缩性片材的制造方法，该方法包括下述拉伸工序：将含有具有弹性伸缩性的弹性层和实质上为非弹性的非弹性纤维层，且两层进行部分接合而成的带状层叠片材，或者将含有弹性成分和实质上为非弹性的成分，且形成有通过压花加工产生的部分压花部的带状纤维片材插入在一对凹凸辊之间，所述一对凹凸辊为在轴长方向上交替形成有大径部和小径部的一对凹凸辊，且按照一个凹凸辊的大径部松弛地嵌入在另一个凹凸辊的大径部之间的方式组合在一起；其中，在所述拉伸工序中，使上述层叠片材或上述纤维片材的宽度方向上的上述两层彼此的接合部或上述压花部的位置与凹凸辊的大径部的位置一致，使该层叠片材或上述纤维片材在其宽度方向上拉伸。 In addition, the present invention also provides a method for manufacturing a stretchable sheet, which method includes the following stretching process: an elastic layer having elastic stretchability and a non-elastic fiber layer that is substantially non-elastic, and the two layers are stretched. A partially bonded belt-shaped laminated sheet, or a belt-shaped fiber sheet containing an elastic component and a substantially inelastic component, and formed with a partial embossed portion produced by embossing is inserted between a pair of concave-convex rollers Among them, the pair of concave-convex rollers is a pair of concave-convex rollers that are alternately formed with large-diameter parts and small-diameter parts in the axial direction, and the large-diameter part of one concave-convex roller is loosely embedded in the large-diameter part of the other concave-convex roller. The parts are combined together; wherein, in the stretching process, the positions of the joining parts of the above-mentioned two layers in the width direction of the above-mentioned laminated sheet or the above-mentioned fiber sheet or the position of the above-mentioned embossed part and the concavo-convex The positions of the large-diameter portions of the rollers are aligned, and the laminated sheet or the fiber sheet is stretched in its width direction. the

另外，本发明还提供一种层叠片材的拉伸方法，其中，将含有具有弹性伸缩性的弹性层和实质上为非弹性的非弹性纤维层，且两层进行部分接合而成的层叠片材以上述两层彼此的接合部为基点进行拉伸。 In addition, the present invention also provides a method for stretching a laminated sheet, wherein a laminated sheet comprising an elastic layer having elastic stretchability and a substantially non-elastic non-elastic fiber layer, and the two layers are partially bonded The material is stretched based on the junction of the above two layers. the

另外，本发明还提供一种纤维片材的拉伸方法，其中，将含有弹性成分和实质上为非弹性的成分，且形成有通过压花加工产生的部分压花部的纤维片材以压花部为基点进行拉伸。 In addition, the present invention also provides a method for stretching a fibrous sheet, wherein a fibrous sheet containing an elastic component and a substantially inelastic component and having a partially embossed portion formed by an embossing process is compressed by embossing The flower part is used as the base point for stretching. the

另外，本发明还提供一种伸缩性片材，其含有具有弹性伸缩性的弹性层和实质上为非弹性的非弹性纤维层，且两层接合而成的接合部形成在片材的拉伸方向的多个位置上，其中，所述伸缩性片材的至少一个面上具有分别沿着与上述拉伸方向大致垂直的方向延伸的隆起部和凹槽部，该隆起部和该凹槽部交替形成在上述拉伸方向上，且分别形成有多个，上述接合部至少位于上述隆起部上。 In addition, the present invention also provides a stretchable sheet comprising an elastic layer having elastic stretchability and a substantially inelastic non-elastic fiber layer, and a joint formed by joining the two layers is formed at the stretching point of the sheet. direction, wherein at least one surface of the stretchable sheet has ridges and grooves respectively extending in a direction substantially perpendicular to the above stretching direction, the ridges and the grooves Alternately formed in the above-mentioned stretching direction, and a plurality of each are formed, and the above-mentioned joint part is located at least on the above-mentioned protruding part. the

另外，本发明还提供一种伸缩性片材，其含有弹性成分和实质上为非弹性的成分，且在片材的拉伸方向的多个位置上形成有通过压花加工产生的部分压花部，其中，所述伸缩性片材的至少一个面上具有分别沿 着与上述拉伸方向大致垂直的方向延伸的隆起部和凹槽部，该隆起部和该凹槽部交替形成在上述拉伸方向上，且分别形成有多个，上述压花部至少位于上述隆起部上。 In addition, the present invention also provides a stretchable sheet comprising an elastic component and a substantially inelastic component, and partially embossed by embossing at a plurality of positions in the stretching direction of the sheet. wherein, at least one surface of the stretchable sheet has ridges and grooves respectively extending in a direction substantially perpendicular to the above-mentioned stretching direction, and the ridges and the grooves are alternately formed on the above-mentioned pull In the stretching direction, a plurality of embossed parts are respectively formed, and the above-mentioned embossed part is located at least on the above-mentioned raised part. the

附图说明Description of drawings

图1为表示本发明的伸缩性片材的制造方法的一个实施方式中使用的伸缩性片材的制造装置的示意图。 Fig. 1 is a schematic diagram showing a stretchable sheet manufacturing apparatus used in one embodiment of the stretchable sheet manufacturing method of the present invention. the

图2为表示本发明中实施拉伸加工的层叠片材的一个例子的俯视图。 Fig. 2 is a plan view showing an example of a laminated sheet subjected to stretch processing in the present invention. the

图3(a)～图3(d)为图2所示的层叠片材的CD方向的示意截面图，图3(a)为表示沿着图2的I-I线的截面的图、图3(b)为表示在凹凸辊之间发生变形的状态(使其拉伸的状态)的对应于图3(a)的截面的图、图3(c)为表示沿着图2的II-II线的截面的图、图3(d)为表示在凹凸辊之间发生变形的状态(使其拉伸的状态)的对应于(c)的截面的图。 Fig. 3 (a) ~ Fig. 3 (d) are the schematic sectional views of the CD direction of the laminated sheet shown in Fig. b) is a diagram corresponding to the cross-section of FIG. 3( a ) showing the state of deformation between the concave and convex rollers (the state of making it stretched), and FIG. 3( c ) is a view along the line II-II of FIG. 2 Fig. 3(d) is a cross-sectional view corresponding to (c) showing a state in which deformation occurs between concave-convex rollers (a state in which it is stretched). the

图4(a)和图4(b)为表示将图2所示的层叠片材沿CD方向拉伸获得的伸缩性无纺布(伸缩性片材)的示意图，图4(a)为表示对应于图2的I-I线截面的截面的图、图4(b)为表示对应于图2的II-II线截面的截面的图。 Figure 4(a) and Figure 4(b) are schematic diagrams showing stretchable non-woven fabrics (stretchable sheets) obtained by stretching the laminated sheet shown in Figure 2 along the CD direction, and Figure 4(a) is a schematic diagram showing FIG. 4( b ) is a diagram showing a cross section corresponding to the II-II line cross section in FIG. 2 . the

图5(a)和图5(b)为表示本发明的伸缩性片材的一个实施方式的图，图5(a)为表示伸缩性无纺布(伸缩性片材)的非弹性纤维层侧的面的示意俯视图、图5(b)为沿着图5(a)III-III线的截面图。 Figure 5(a) and Figure 5(b) are diagrams showing one embodiment of the stretchable sheet of the present invention, and Figure 5(a) shows the non-elastic fiber layer of the stretchable nonwoven fabric (stretchable sheet) A schematic top view of the side surface, Fig. 5(b) is a cross-sectional view along line III-III in Fig. 5(a). the

图6为表示用于将层叠片材或纤维片材在MD方向上拉伸的拉伸装置的一个例子的图。 Fig. 6 is a diagram showing an example of a stretching device for stretching a laminated sheet or a fiber sheet in the MD direction. the

图7为表示用于将层叠片材或纤维片材在MD方向上拉伸的拉伸装置的另一个例子的图。 Fig. 7 is a diagram showing another example of a stretching device for stretching a laminated sheet or a fiber sheet in the MD direction. the

图8为表示用于将层叠片材或纤维片材在MD方向上拉伸的拉伸装置的又一个例子的图。 Fig. 8 is a diagram showing still another example of a stretching device for stretching a laminated sheet or a fiber sheet in the MD direction. the

具体实施方式Detailed ways

以下根据优选的实施方式参照着附图说明本发明。 Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. the

本发明的第1实施方式中，如图3(a)和图3(c)所示，在具有弹性伸缩性的第1纤维层(弹性层)1的两面上分别层叠实质上为非弹性的第2和第3纤维层(非弹性纤维层)2、3，对上述层以规则图案进行部分接合而成的层叠片材10A实施拉伸加工。 In the first embodiment of the present invention, as shown in Fig. 3(a) and Fig. 3(c), substantially non-elastic fibers are laminated on both sides of the first fiber layer (elastic layer) 1 having elastic stretchability. The second and third fiber layers (non-elastic fiber layers) 2 and 3 are stretched on a laminatedsheet 10A obtained by partially joining the layers in a regular pattern. the

本实施方式中，例如可以使用如图1所示那样获得的层叠片材10A。即，在由第1梳理机21供给并在一个方向(流动方向、MD)上连续搬送的纤维网(第3纤维层)3上供给通过纤维成形机22而成形的弹性纤维1’，在该纤维网3上连续地形成由弹性纤维1’构成的层(第1纤维层)1。进而，在其上连续地供给由第2梳理机23供给的纤维网(第2纤维层)2后，对于所得的3层结构的层叠片材10B通过热风方式的干燥机24实施热风处理，通过具有在周面上规则地配置有压花用凸部的压花辊26和与其相对配置的支承辊27的压花装置25对热风处理后的层叠片材10B实施压花加工。由此，如图2及图3(a)和图3(c)所示，获得以规则图案形成有接合部4的层叠片材10A。 In this embodiment, for example, a laminatedsheet 10A obtained as shown in FIG. 1 can be used. That is, the elastic fiber 1' formed by thefiber forming machine 22 is supplied on the fiber web (the third fiber layer) 3 supplied by the first carding machine 21 and continuously conveyed in one direction (flow direction, MD). A layer (first fiber layer) 1 made ofelastic fibers 1 ′ is continuously formed on thefiber web 3 . Furthermore, after the fiber web (the second fiber layer) 2 supplied by the 2nd carding machine 23 is continuously supplied thereon, the laminated sheet 10B of the obtained 3-layer structure is subjected to hot air treatment by a dryer 24 of a hot air method, and The embossing apparatus 25 which has the embossing roll 26 in which the embossing convex part was arrange|positioned regularly on the peripheral surface, and the back-up roll 27 arrange|positioned facing this embosses the laminated sheet 10B after hot-air processing. Thereby, as shown in FIG. 2 and FIG. 3( a ) and FIG. 3( c ), a laminatedsheet 10A in which the joiningportions 4 are formed in a regular pattern is obtained. the

在上述层叠片材10A的制造方法中，虽然为了弹性纤维和非弹性纤维的热熔融粘接以及纤维的进入而进行了利用干燥机24的热风处理，但也可以省略该热风处理。 In the method for producing the laminatedsheet 10A described above, the hot air treatment by the dryer 24 is performed for thermal fusion bonding of elastic fibers and inelastic fibers and entry of fibers, but this hot air treatment may be omitted. the

对层叠片材10A的优选构成进行说明。 A preferred configuration of the laminatedsheet 10A will be described. the

第1纤维层(弹性层)1具有能够拉伸且当从拉伸力中释放出来时进行收缩的性质，在至少与面平行的一个方向上，优选在拉伸100％后使其收缩时的残留变形为20％以下、更优选在拉伸100％后使其收缩时的残留变形为10％以下。这些值优选至少在MD方向和CD方向中的任何一个方向上满足，更优选在两个方向上满足。最大伸长率优选为30～500％、特别优选为300～500％。 The first fibrous layer (elastic layer) 1 has the property of being stretchable and shrinking when released from the stretching force, in at least one direction parallel to the surface, preferably when stretched 100% and shrunk. The residual strain is 20% or less, more preferably 10% or less when the film is stretched 100% and shrunk. These values are preferably satisfied at least in any one of the MD direction and the CD direction, more preferably in both directions. The maximum elongation is preferably 30 to 500%, particularly preferably 300 to 500%. the

第1纤维层(弹性层)1优选含有由弹性材料构成的弹性纤维。作 为弹性材料，可以列举出热塑性弹性体、橡胶、乙烯-丙烯共聚物等，其中，从纤维状的弹性体能够比较容易地成形的观点出发，优选为热塑性弹性体。作为热塑性弹性体，可以列举出聚氨酯、苯乙烯系(SBS、SIS、SEBS、SEPS等)、烯烃系(乙烯、丙烯、丁烯等的共聚物等)、氯乙烯系、聚酯系等。这些物质可以单独使用一种或者组合2种以上使用。 The first fiber layer (elastic layer) 1 preferably contains elastic fibers made of an elastic material. Examples of elastic materials include thermoplastic elastomers, rubber, ethylene-propylene copolymers, etc. Among them, thermoplastic elastomers are preferable from the viewpoint that fibrous elastomers can be molded relatively easily. Examples of thermoplastic elastomers include polyurethane, styrene-based (SBS, SIS, SEBS, SEPS, etc.), olefin-based (copolymers of ethylene, propylene, butene, etc.), vinyl chloride-based, polyester-based, and the like. These substances can be used individually by 1 type or in combination of 2 or more types. the

第1纤维层1中的由弹性材料构成的弹性纤维的含有率优选为50～100重量％、特别优选为75～100重量％。在第1纤维层的弹性纤维树脂中还可以含有聚乙烯、聚丙烯、聚酯(PET或PBT)、尼龙等非弹性树脂或者有机或无机颜料、各种添加剂(抗氧化剂、增塑剂等)。另外，第一纤维层中可以含有非弹性纤维、有机或无机颜料。 The content of the elastic fibers made of an elastic material in thefirst fiber layer 1 is preferably 50 to 100% by weight, particularly preferably 75 to 100% by weight. The elastic fiber resin of the first fiber layer may also contain non-elastic resins such as polyethylene, polypropylene, polyester (PET or PBT), nylon, or organic or inorganic pigments, various additives (antioxidants, plasticizers, etc.) . In addition, non-elastic fibers, organic or inorganic pigments may be contained in the first fiber layer. the

作为弹性层，还可以使用薄膜状、网状的弹性层等来代替由纤维层构成的弹性层。作为薄膜或网的形成材料，可以使用上述各种弹性材料。 As the elastic layer, a film-like or mesh-like elastic layer or the like may be used instead of the elastic layer made of a fiber layer. As the film or web forming material, various elastic materials mentioned above can be used. the

第2和第3纤维层(非弹性纤维层)2、3虽然具有伸长性，但实质上为非弹性。这里所说的伸长性可以是构成纤维本身伸长的情况；也可以是即使构成纤维本身不伸长，但在纤维之间交点处发生了热熔融粘接的两纤维之间分离、或由于纤维之间的热熔融粘接等而多根纤维所形成的立体结构在结构上发生变化、或构成纤维发生破碎、从而以纤维层的形式发生伸长的情况。 Although the second and third fiber layers (non-elastic fiber layers) 2 and 3 are extensible, they are substantially inelastic. The elongation mentioned here may be the case where the constituent fibers themselves are elongated; it may also be that even if the constituent fibers themselves are not elongated, the separation between the two fibers caused by thermal fusion bonding at the intersection between the fibers, or due to When the three-dimensional structure formed by a plurality of fibers changes structurally due to thermal fusion bonding between fibers, or the constituent fibers are broken and elongated in the form of fiber layers. the

作为构成非弹性纤维层的纤维，可以列举出聚乙烯、聚丙烯、聚酯(PET或PBT)、尼龙等或由聚乳酸等生物降解树脂构成的纤维等。构成非弹性纤维层的纤维可以是短纤维也可以是长纤维，可以是亲水性也可以是疏水性的。另外，还可以使用芯鞘型的复合纤维、分割纤维、异形截面纤维、卷曲纤维、热收缩纤维等。这些纤维可以单独使用1种或者组合2种以上使用。特别是在为短纤维时，由于拉伸易引起起毛，但如果使用本方法，则难以引起接合部的破坏，因此可以得到强度高、且能够防止起毛，肌肤触感良好的产品，从这点出发是优选的。 Examples of fibers constituting the inelastic fiber layer include polyethylene, polypropylene, polyester (PET or PBT), nylon, and fibers made of biodegradable resins such as polylactic acid. The fibers constituting the inelastic fiber layer may be short fibers or long fibers, and may be hydrophilic or hydrophobic. In addition, core-sheath-type conjugated fibers, split fibers, modified cross-section fibers, crimped fibers, heat-shrinkable fibers, and the like can also be used. These fibers can be used individually by 1 type or in combination of 2 or more types. Especially in the case of short fibers, it is easy to cause fuzz due to stretching, but if this method is used, it is difficult to cause damage to the joint part, so it is possible to obtain a product that is high in strength, prevents fuzz, and has a good touch on the skin. is preferred. the

例如如图2及图3(a)和图3(c)所示那样，接合部4优选在层 叠片材10A的流动方向(MD)及其垂直方向(CD)这两个方向上不连续地形成。另外，从获得肌肤触感良好的伸缩性无纺布(伸缩性片材)的观点出发，层叠片材10A优选第2纤维层和/或第3纤维层的接合部4在层叠片材10A表面上形成凹部，除此以外的部分成为凸部。 For example, as shown in FIG. 2 and FIG. 3(a) and FIG. 3(c), thejoint portion 4 is preferably discontinuous in both the flow direction (MD) and the vertical direction (CD) of thelaminated sheet 10A. formed. In addition, from the viewpoint of obtaining a stretchable nonwoven fabric (stretchable sheet) with good skin feel, thelaminated sheet 10A preferably has thejoint portion 4 of the second fiber layer and/or the third fiber layer on the surface of thelaminated sheet 10A. A concave portion is formed, and the other portion becomes a convex portion. the

在第1实施方式中，如上所述，对3层结构的层叠片材10A实施拉伸加工。 In the first embodiment, as described above, thelaminated sheet 10A having a three-layer structure is stretched. the

在第1实施方式中，如图1及图3(b)和图3(d)所示，使用具有在轴长方向上分别交替形成有大径部31、32和小径部(未图示)的一对凹凸辊33、34的拉伸装置30，使层叠片材10A在与其流动方向垂直的方向(CD)上拉伸。 In the first embodiment, as shown in FIG. 1 and FIG. 3( b ) and FIG. 3( d ), a motor with large-diameter portions 31 and 32 and small-diameter portions (not shown) alternately formed in the axial length direction is used. The stretching device 30 of a pair of concave-convex rollers 33, 34 stretches thelaminated sheet 10A in a direction (CD) perpendicular to its flow direction. the

拉伸装置30的构成为：通过公知的升降机构使一个或两个凹凸辊33、34的枢轴部上下变位，从而能够调节两辊33、34之间的间隔。 The stretching device 30 is configured to vertically displace the pivot portion of one or two concave-convex rollers 33, 34 by a known elevating mechanism, so that the distance between the two rollers 33, 34 can be adjusted. the

在本实施方式的方法中，如图1及图3(b)和图3(d)所示那样，按照一个凹凸辊33的大径部31松弛地嵌入在另一个凹凸辊34的大径部32之间、另一个凹凸辊34的大径部32松弛地嵌入在上述一个凹凸辊33的大径部31之间的方式组合各凹凸辊33、34，在该状态的两辊33、34之间插入层叠片材10A，使该层叠片材10A拉伸。 In the method of this embodiment, as shown in FIG. 1 and FIG. 3(b) and FIG. 32, and the large-diameter portion 32 of the other concave-convex roller 34 is loosely embedded in the mode between the large-diameter portion 31 of the above-mentioned one concave-convex roller 33. Combine each concave-convex roller 33,34. Thelaminated sheet 10A is inserted between them, and thelaminated sheet 10A is stretched. the

在该拉伸工序中，如图2及图3(a)～图3(d)所示，使层叠片材10A的宽度方向上的接合部4的位置与凹凸辊33、34的大径部31、32的位置一致。具体地说，如图2所示，在层叠片材10A上形成有多根接合部列，该接合部列由多个接合部4在MD方向上串联且直线状地排列而形成(图2中显示了10根)，在图2中，对于以位于最左侧的接合部列R₁为起点、由此开始的每隔一个的接合部列R₁分别含有的接合部而言，使一个凹凸辊33的大径部31的位置一致；对于以位于左侧第2个接合部列R₂为起点、由此开始的每隔一个的接合部列R₂分别含有的接合部而言，使另一个凹凸辊34的大径部32的位置一致。图2中符号31、32所示的范围表示在层叠片材10A插入到两凹凸辊33、34之间的状态的一个时刻，与各辊的大径部31、32的周面相重叠的范围。 In this stretching step, as shown in FIG. 2 and FIG. The positions of 31 and 32 are consistent. Specifically, as shown in FIG. 2 , a plurality of joining portion rows are formed on thelaminated sheet 10A, and the joining portion rows are formed by arranging a plurality of joiningportions 4 in series and linearly in the MD direction (in FIG. 10 are shown), in FIG. 2 , for the junctions included in every other junction row R₁ starting from the leftmost junction row R₁ , one concavo-convex The positions of the large-diameter portions 31 of the rollers₃₃ are consistent; for the joints included in every other joint row R2 starting from the second joint row_R2 on the left side, the other The positions of the large-diameter portion 32 of one concave-convex roller 34 are aligned. The ranges indicated byreference numerals 31 and 32 in FIG. 2 represent the ranges overlapping the peripheral surfaces of the large-diameter portions 31 and 32 of the respective rollers at a moment when thelaminated sheet 10A is inserted between the two concave-convex rollers 33 and 34 .

根据本实施方式，当层叠片材10A通过凹凸辊33、34之间时，如图3(b)和图3(d)所示，接合部4与任何一个凹凸辊的大径部31、32重叠，而不与大径部31、32重叠的大径部之间的区域、即上述接合部列间的区域被积极地拉伸。这样，通过以接合部4为基点拉伸层叠片材10A，可以防止接合部4的破坏(层间的剥离等)，同时高效地拉伸层叠片材10A的接合部以外的部分。另外，通过该拉伸，在第2和第3纤维层(非弹性纤维层)2、3上产生即便层叠片材10A收缩也不会回复的变化，通过该变化，第2和第3纤维层(非弹性纤维层)2、3阻碍弹性纤维层自由伸缩的程度大大降低。 According to this embodiment, when thelaminated sheet 10A passes between the concave-convex rollers 33, 34, as shown in FIG. 3(b) and FIG. The region between the large-diameter parts that overlap but does not overlap with the large-diameter parts 31 and 32 , that is, the region between the above-mentioned joining part rows, is actively stretched. In this way, by stretching thelaminated sheet 10A with thejunction 4 as the base point, it is possible to efficiently stretch the portion of thelaminated sheet 10A other than the junction while preventing damage to the junction 4 (delamination between layers, etc.). In addition, by this stretching, the second and third fiber layers (non-elastic fiber layers) 2 and 3 undergo a change that does not recover even if thelaminated sheet 10A shrinks. Through this change, the second and third fiber layers (Non-elastic fiber layer) 2, 3 greatly reduce the degree of hindering the free expansion and contraction of the elastic fiber layer. the

由此，根据本实施方式，可以高效地制造高伸缩性、肌肤触感柔软、强度高、破裂或起毛少的外观良好的伸缩性无纺布(伸缩性片材)。 Thus, according to the present embodiment, it is possible to efficiently manufacture a stretchable nonwoven fabric (stretchable sheet) with high stretchability, soft touch, high strength, and good appearance with little cracking or fuzzing. the

作为在第2和第3纤维层(非弹性纤维层)2、3上产生的、即便层叠片材10A收缩也不会回复的变化，如上所述，可以列举出构成纤维不能回复地拉伸、或者在纤维之间的交点处发生了热熔融粘接的两纤维之间分离、或者由于纤维之间的热熔融粘接等而由多根纤维形成的立体结构发生结构上变化、或者构成纤维破碎等。但是，从获得肌肤触感良好的伸缩性无纺布(伸缩性片材)的观点出发，构成纤维优选发生了热熔融粘接的两纤维之间分离或者构成纤维以起毛不严重的程度部分地破碎。 As the change that occurs on the second and third fiber layers (non-elastic fiber layers) 2 and 3, even if thelaminated sheet 10A shrinks and does not recover, as described above, the constituent fibers can be stretched without recovery, Either the two fibers are separated by thermal fusion bonding at the intersection point between the fibers, or the three-dimensional structure formed by a plurality of fibers is structurally changed due to thermal fusion bonding between the fibers, or the fiber is broken. wait. However, from the viewpoint of obtaining a stretchable nonwoven fabric (stretchable sheet) with a good touch on the skin, the constituent fibers are preferably separated from each other by thermal fusion bonding, or the constituent fibers are partially broken to such an extent that fluffing is not serious. . the

图4(a)和图4(b)表示在第1实施方式的制造方法中获得的伸缩性无纺布10的截面。图4(a)为对应于图2的I-I线截面的截面、图4(b)为对应于图2的II-II线截面的截面。 4( a ) and FIG. 4( b ) show cross-sections of thestretchable nonwoven fabric 10 obtained in the manufacturing method of the first embodiment. FIG. 4( a ) is a section corresponding to the I-I line section of FIG. 2 , and FIG. 4( b ) is a section corresponding to the II-II line section of FIG. 2 . the

另外，图5(a)为表示伸缩性无纺布10的非弹性纤维层2侧的面的示意俯视图、图5(b)为沿着图5(a)的III-III线的截面图。 5( a ) is a schematic plan view showing the surface of thestretchable nonwoven fabric 10 on the side of theinelastic fiber layer 2 , and FIG. 5( b ) is a cross-sectional view along line III-III of FIG. 5( a ). the

伸缩性无纺布10如图5(b)所示，具有在具有弹性伸缩性的第1纤维层(弹性层)1的两面上分别层叠有实质上为非弹性的第2和第3纤维层(非弹性纤维层)2、3而成的结构。而且，在伸缩性无纺布(伸缩性片材)10的拉伸方向(图中D1方向)的多个位置上形成有从第2纤维层2至第3纤维层3在厚度方向上一体化了的接合部4、4。 Thestretchable nonwoven fabric 10 is shown in Fig. 5 (b), has the 2nd and the 3rd fibrous layer that are substantially non-elastic and laminated respectively on both sides of the 1st fibrous layer (elastic layer) 1 that has elastic stretchability. (Non-elastic fiber layer) The structure formed by 2,3. And, on the stretching direction (D1 direction in the drawing) of stretch nonwoven fabric (stretchable sheet) 10, form at a plurality of positions, from the 2ndfibrous layer 2 to the 3rdfibrous layer 3 integrally in the thickness direction. Thejoints 4,4. the

这里，拉伸方向是指将弹性层和非弹性纤维层的两层进行部分接合而成的层叠片材或者含有弹性成分和实质上为非弹性的成分、且形成有部分压花部的纤维片材拉伸以获得伸缩性片材时实施拉伸的方向，是指与片材的面平行的方向。在伸缩性片材中，拉伸方向为伸缩方向，当从伸缩性片材无法确认拉伸方向时，将伸缩方向的最大伸缩方向作为拉伸方向。最大伸缩方向在伸缩性片材仅在与该片材的面平行的方向中的一个方向上伸缩时，为该一个方向；当伸缩片材在与该片材的面平行的方向中的多个方向上伸缩时，将与拉伸试验的拉伸方向中最大强度点的伸长率(最大伸长率)最小的方向垂直的方向作为最大伸缩方向。 Here, the stretching direction refers to a laminated sheet in which two layers of an elastic layer and a non-elastic fiber layer are partially bonded, or a fiber sheet containing an elastic component and a substantially non-elastic component, and a partially embossed portion is formed. The direction in which stretching is performed when stretching a material to obtain a stretchable sheet means a direction parallel to the surface of the sheet. In the stretchable sheet, the stretching direction is the stretching direction, and when the stretching direction cannot be confirmed from the stretchable sheet, the stretching direction is the maximum stretching direction in the stretching direction. When the stretchable sheet stretches only in one direction parallel to the face of the sheet, it is the one direction; when the stretchable sheet stretches in multiple directions parallel to the face of the sheet When stretching in one direction, the direction perpendicular to the direction in which the elongation at the point of maximum strength (maximum elongation) is the smallest in the stretching direction of the tensile test was defined as the direction of maximum stretching. the

本实施方式的伸缩性无纺布10是将上述层叠片材10A在宽度方向(CD方向)上拉伸而获得，与层叠片材10A的宽度方向相同的方向最富有伸缩性。因此，与层叠片材10A的宽度方向相同的方向、换而言之在制造时垂直于机械方向(MD)的方向(CD)为拉伸方向、且为最大伸缩方向。 Thestretchable nonwoven fabric 10 of the present embodiment is obtained by stretching the above-mentionedlaminated sheet 10A in the width direction (CD direction), and is most stretchable in the same direction as the width direction of thelaminated sheet 10A. Therefore, the same direction as the width direction of thelaminated sheet 10A, in other words, the direction (CD) perpendicular to the machine direction (MD) at the time of manufacture is the stretching direction and is the maximum stretching direction. the

伸缩性无纺布10如图4(a)、图4(b)、图5(a)和图5(b)所示，在其两面上分别具有多个隆起部12和多个凹槽部13。而且，在伸缩性无纺布10的任何面上，隆起部12和凹槽部13分别沿着与伸缩性无纺布10的拉伸方向(图中D1方向)大致垂直的方向(图中D2方向)延伸，并且在拉伸方向(图中D1方向)上交替形成。 As shown in Fig. 4(a), Fig. 4(b), Fig. 5(a) and Fig. 5(b), the stretchablenon-woven fabric 10 has a plurality ofridges 12 and a plurality of grooves on its two sides respectively. 13. Moreover, on any face of thestretchable nonwoven fabric 10, the protrudingportion 12 and thegroove portion 13 are respectively along a direction (D2 in the figure) approximately perpendicular to the stretching direction (D1 direction in the figure) of thestretchable nonwoven fabric 10 direction) and alternately formed in the stretching direction (D1 direction in the figure). the

这样，在伸缩性无纺布10的两面分别在拉伸方向上交替形成有隆起部12和凹槽部13。由此，伸缩性无纺布10的截面在微观上成为波浪形状。该波浪形状通过制造伸缩性无纺布10时的拉伸加工而生成。该波浪形状产生赋予伸缩性无纺布10伸缩性的结果，并不会对无纺布10的手感本身造成较大的不良影响，可以获得更为柔软、优良的无纺布。 In this way, the raisedportions 12 and thegrooved portions 13 are alternately formed on both surfaces of thestretchable nonwoven fabric 10 in the stretching direction. Thereby, the cross section of thestretchable nonwoven fabric 10 becomes a wave shape microscopically. This wavy shape is produced by stretching when manufacturing thestretchable nonwoven fabric 10 . This wavy shape is the result of imparting stretchability to thestretchable nonwoven fabric 10, and does not have a large adverse effect on the texture of thenonwoven fabric 10 itself, and a softer and superior nonwoven fabric can be obtained. the

伸缩性无纺布10各面上的隆起部12如图5(a)所示，作为整体沿着大致垂直于拉伸方向的方向(图中D2方向)延伸。在隆起部12的长度方向上间断地形成有多个上述接合部4。接合部4位于隆起部12的宽度方向的大致中央。 As shown in FIG. 5( a ), the raisedportions 12 on each surface of thestretchable nonwoven fabric 10 extend in a direction substantially perpendicular to the stretching direction (D2 direction in the figure) as a whole. A plurality of thejoint portions 4 described above are intermittently formed in the longitudinal direction of the protrudingportion 12 . The joiningportion 4 is located substantially at the center of the raisedportion 12 in the width direction. the

隆起部12的长度方向上的接合部4和接合部4之间的大致中央部分12a变得最高，而接合部4及其周围相对地变低，在隆起部12的一部分上形成小的凹部12b。 The substantiallycentral portion 12a between thejoint portion 4 and thejoint portion 4 in the longitudinal direction of the protrudingportion 12 becomes the highest, while thejoint portion 4 and its surroundings become relatively low, and a smallconcave portion 12b is formed on a part of the protrudingportion 12 . the

在本实施方式的伸缩性无纺布10中，在凹槽部13的长度方向上也间断地形成有多个接合部4，该接合部4位于凹槽部13的宽度方向的大致中央。 In thestretch nonwoven fabric 10 of this embodiment, also in the longitudinal direction of thegroove part 13, theseveral junction part 4 which is located in the approximate center of the width direction of thegroove part 13 is intermittently formed. the

通过在隆起部12上形成接合部4，可以防止起毛的发生。 By forming the joiningportion 4 on the protrudingportion 12, occurrence of fluff can be prevented. the

在本发明的伸缩性片材中，只要是在从该伸缩性片材任何一个面侧观察时为隆起部的位置上形成即可。即，即便接合部形成在从伸缩性片材的一个面侧观察为凹槽部的位置上，只要该凹槽部从其它面侧观察时为隆起部，则该接合部即为形成在隆起部上的接合部。 In the stretchable sheet of the present invention, what is necessary is just to form it at a position that is a raised portion when viewed from either side of the stretchable sheet. That is, even if the joining portion is formed at a position where the groove is viewed from one side of the stretchable sheet, as long as the groove is a raised portion when viewed from the other side, the joining portion is formed on the raised portion. joint on the top. the

另外，本实施方式的伸缩性无纺布10的位于隆起部12的接合部列R₁与位于相邻凹槽部13的接合部列R₂之间的区域可以伸缩，相反，位于隆起部12的接合部列R₁与位于凹槽部13的接合部列R₂实质上不能伸缩、或者即便伸缩其伸缩程度也小于接合部列间的区域。这里，隆起部12的接合部列R₁与各隆起部12的多个接合部4重叠，为实质上宽度与各接合部4的宽度相同的带状区域。凹槽部13的接合部列R₂与各凹槽部13的多个接合部4重叠，为实质上宽度与各接合部4的宽度相同的带状区域。 In addition, in thestretchable nonwoven fabric 10 of the present embodiment, the region between the junction row_R1 of thebulge 12 and the junction row_R2 of theadjacent groove part 13 can be stretched and contracted. The junction row_R1 and the junction row_R2 located in thegroove part 13 are substantially incapable of expansion and contraction, or even if stretched, the degree of expansion and contraction is smaller than the region between the junction rows. Here, the joining part row_R1 of the raisedpart 12 overlaps with the plurality of joiningparts 4 of each raisedpart 12 , and is a band-shaped region whose width is substantially the same as that of each joiningpart 4 . The junction row R₂ of thegroove portion 13 overlaps the plurality ofjunction portions 4 of eachgroove portion 13 , and is a strip-shaped region having substantially the same width as eachjunction portion 4 .

为了不破坏层叠片材10A(第2发明中的纤维片材)，凹凸辊的大径部的周面优选为不尖锐，如图3(b)和图3(d)所示，优选为规定宽度的平坦面。大径部前端面的宽度W[参照图3(b)]优选为0.3～1mm，优选为接合部4的CD方向尺寸的0.7～2倍、特别优选为0.9～1.3倍。 In order not to damage thelaminated sheet 10A (fibrous sheet in the second invention), the peripheral surface of the large-diameter portion of the concave-convex roll is preferably not sharp, as shown in Figure 3 (b) and Figure 3 (d), preferably prescribed Width flat side. The width W of the front end surface of the large-diameter portion [see FIG. 3(b)] is preferably 0.3 to 1 mm, preferably 0.7 to 2 times, and particularly preferably 0.9 to 1.3 times the dimension in the CD direction of the joiningportion 4 . the

另外，大径部间的间距P[参照图3(b)]优选为0.7～2.5mm，优选为接合部4的CD方向尺寸的1.2～5倍、特别优选为2～3倍。由此可以获得布一样的外观，肌肤触感良好。另外，层叠片材10A的接合部4的CD方向的间距(CD方向上相邻的接合部列R₁之间的间距或者CD 方向上相邻的接合部列R₂之间的间距)P1[参照图3(a)]，相对于大径部间的间距P，为了使位置关系一致基本为2倍，但为了层叠片材10A在CD方向上的伸长或缩幅，如果在1.7倍～2.3倍的范围内即可使位置一致。通过将大径部间的间距P和接合部4的间距P1设定为该比例，可以稳定地使层叠片材10A的具有接合部列的部分稳定地位于与大径部相接触的位置。而且，层叠片材10A的通过大径部之间的部分与接触于大径部的部分相比，被高倍率地拉伸。层叠片材10A的与凹凸辊的大径部压接的部分与通过大径部之间的部分相比，拉伸倍率更低，因此具有接合部列的部分的位置与大径部的位置在拉伸方向上难以错位。 In addition, the pitch P between the large-diameter parts [see FIG. 3(b)] is preferably 0.7 to 2.5 mm, and is preferably 1.2 to 5 times, particularly preferably 2 to 3 times, the dimension in the CD direction of the joiningportion 4 . As a result, a cloth-like appearance can be obtained with a good touch on the skin. In addition, the pitch in the CD direction of thejoint parts 4 of thelaminated sheet 10A (the pitch between the joint part rows_R1 adjacent in the CD direction or the pitch between the joint part rows_R2 adjacent in the CD direction) P1[ Referring to Fig. 3(a)], with respect to the pitch P between the large-diameter parts, in order to make the positional relationship consistent, it is basically 2 times, but for the elongation or shrinkage of thelaminated sheet 10A in the CD direction, if it is 1.7 times ~ The position can be made consistent within the range of 2.3 times. By setting the pitch P between the large-diameter parts and the pitch P1 of thejoint parts 4 to this ratio, the part having the joint part row of thelaminated sheet 10A can be stably positioned in contact with the large-diameter parts. Furthermore, the portion of thelaminated sheet 10A that passes between the large-diameter portions is stretched at a higher ratio than the portion that is in contact with the large-diameter portions. The portion of thelaminated sheet 10A that is in pressure contact with the large-diameter portion of the concave-convex roll has a lower draw ratio than the portion that passes between the large-diameter portions. Therefore, the position of the portion having the joining portion row and the position of the large-diameter portion are between Difficult to misalign in the stretching direction.

作为以弹性层与非弹性纤维层的接合部4为基点拉伸层叠片材10A的方法，除了如上述实施方式那样，使接合部4的位置与凹凸辊的大径部31、32的位置一致并使大径部31、32间积极地拉伸的方法之外，还可以使用日本特开平6-133998号公报所记载的方法。 As a method of stretching thelaminated sheet 10A based on thejoint portion 4 of the elastic layer and the non-elastic fiber layer, as in the above embodiment, the position of thejoint portion 4 is aligned with the positions of the large-diameter portions 31 and 32 of the concave-convex roll. In addition to the method of actively stretching between the large-diameter portions 31 and 32, the method described in Japanese Patent Application Laid-Open No. 6-133998 may also be used. the

另外，在图3(a)～图3(d)所示的方法中，虽然是扩大一个凹凸辊的大径部和另一个凹凸辊的小径部之间的空隙、以在其大径部和小径部之间不夹有层叠片材10A的构成进行拉伸，但也可以缩小两者间的间隔，以夹有层叠片材10A的构成进行拉伸。 In addition, in the method shown in Fig. 3 (a) ~ Fig. 3 (d), although it is to enlarge the gap between the large-diameter portion of one concave-convex roller and the small-diameter portion of another concave-convex roller, so that the large-diameter portion and the small-diameter portion of the other concave-convex roller The small-diameter portions are stretched without thelaminated sheet 10A interposed therebetween, but stretching may be performed with thelaminated sheet 10A sandwiched between the small-diameter portions with the space between them narrowed. the

通过上述拉伸加工，层叠片材10A的厚度在拉伸加工前后优选增加到1.1倍～3倍、特别优选增加到1.3倍～2倍。由此，非弹性纤维层2、3的纤维发生塑性变形而拉伸，由此纤维变细，与此同时，非弹性纤维层2、3变得更加膨松，肌肤触感良好、缓冲性优良。 By the stretching process described above, the thickness of thelaminated sheet 10A is preferably increased by 1.1 to 3 times, particularly preferably 1.3 to 2 times, before and after the stretching process. As a result, the fibers of theinelastic fiber layers 2 and 3 are plastically deformed and stretched, thereby making the fibers thinner, and at the same time, theinelastic fiber layers 2 and 3 become more bulky, providing good skin feel and excellent cushioning properties. the

被拉伸加工前的层叠片材10A的厚度如果薄，则具有可以减小搬送和保管层叠片材10A的辊坯的空间的优点。 If the thickness of thelaminated sheet 10A before drawing processing is thin, there is an advantage that the space for conveying and storing the roll stock of thelaminated sheet 10A can be reduced. the

另外，通过上述拉伸加工，层叠片材10A的弯曲刚性与拉伸加工前相比优选变化为30～80％、特别优选变化为40～70％。由此，可以获得悬垂性良好、柔软的无纺布。另外，优选被拉伸加工前的层叠片材10A的弯曲刚性高，其原因在于在搬送线路中层叠片材10A难以产生皱褶。而且，在拉伸加工时层叠片材10A也不会产生皱褶，易于加工，因此优选。 In addition, the bending rigidity of thelaminated sheet 10A is preferably changed by 30 to 80%, particularly preferably by 40 to 70%, compared with that before the stretching process by the stretching process. Thereby, a soft nonwoven fabric with good drapability can be obtained. In addition, it is preferable that the bending rigidity of thelaminated sheet 10A before being stretched is high because it is difficult for thelaminated sheet 10A to be wrinkled in the conveyance line. Furthermore, since thelaminated sheet 10A does not generate wrinkles during stretching processing, and is easy to process, it is preferable. the

拉伸加工前后的层叠片材10A的厚度和弯曲刚性可以根据非弹性纤维层2、3所用纤维的伸长率、压花辊的压花图案、凹凸辊33、34的间距或前端部的厚度、咬合量来控制。 The thickness and bending rigidity of thelaminated sheet 10A before and after the stretching process can be determined according to the elongation rate of the fibers used in theinelastic fiber layers 2, 3, the embossing pattern of the embossing rolls, the distance between the concave and convex rolls 33, 34, or the thickness of the front end. , Bite amount to control. the

本发明的伸缩性片材如果在接合部的数量中其40％以上、优选70％以上是以接合部为基点拉伸，则可以获得高伸缩性、手感及外观良好、最大强度也高、膨松、缓冲性优异的片材。 In the stretchable sheet of the present invention, if 40% or more, preferably 70% or more, of the number of joints are stretched based on the joints, high stretchability, good hand feeling and appearance, high maximum strength, and high expansion can be obtained. A loose, cushioning sheet. the

本发明的第2实施方式中，对含有弹性成分和实质上为非弹性的成分、且形成有通过压花加工产生的部分压花部的单层纤维片材实施拉伸加工。 In the second embodiment of the present invention, stretching is performed on a single-layer fibrous sheet containing an elastic component and a substantially inelastic component and having partially embossed portions formed by embossing. the

作为第2实施方式的纤维片材，可以使用(1)在芯部由弹性成分构成、鞘部为实质上为非弹性的成分构成的芯鞘型复合纤维、或者由弹性成分和实质上为非弹性的成分构成的并列型或多数分割型的复合纤维所构成的纤维网或各种制法的无纺布等上以与上述第1实施方式同样的图案形成有通过压花加工产生的压花部的纤维片材；(2)在以混合状态含有弹性纤维和非弹性纤维的纤维网或各种制法的无纺布等上以与上述第1实施方式的接合部同样的图案形成有通过压花加工产生的压花部的纤维片材等。作为纤维片材的具体例子，可以列举出在利用梳理法获得的纤维网或通过纺粘法、熔喷法等纺丝而成的纤维网、水流交织纤维网、在针刺交织纤维网上通过加热辊形成有大量俯视时为散点状的热熔融粘接部的纤维片材。 As the fibrous sheet of the second embodiment, (1) a core-sheath composite fiber in which the core is composed of an elastic component and the sheath is composed of a substantially non-elastic component, or an elastic component and a substantially non-elastic component can be used. Embossing by embossing is formed in the same pattern as in the above-mentioned first embodiment on a fiber web composed of side-by-side or multi-divided conjugate fibers composed of elastic components, or non-woven fabrics of various manufacturing methods. (2) a fiber web containing elastic fibers and non-elastic fibers in a mixed state or a non-woven fabric of various manufacturing methods is formed with the same pattern as the joint part of the first embodiment above. Fiber sheets and the like of the embossed portion produced by embossing. Specific examples of the fibrous sheet include fibrous webs obtained by carding, fibrous webs spun by spunbond methods, melt blown methods, etc., water-entangled fibrous webs, needle-punched interwoven fibrous webs by heating The roll is formed with a large number of fibrous sheets having scattered thermally-bonded portions in a planar view. the

作为弹性成分，可以列举出上述弹性纤维的构成材料。作为实质上为非弹性的成分，可以列举出上述非弹性纤维的构成材料。 Examples of the elastic component include the constituent materials of the above-mentioned elastic fibers. Examples of the substantially inelastic component include the constituent materials of the above-mentioned inelastic fibers. the

在第2实施方式中，纤维片材的拉伸以压花部为基点进行。作为其方法，只要是与第1实施方式中以接合部为基点拉伸层叠片材同样地以压花部为基点拉伸纤维片材即可。例如，在上述第1实施方式中，将接合部4和凹凸辊的大径部的位置对齐，并将3层结构的层叠片材10A插入到凹凸辊中，而在本实施方式中取而代之，将压花部与凹凸辊的大径部的位置对齐，将单层的纤维片材插入到凹凸辊中。 In the second embodiment, the stretching of the fiber sheet is performed based on the embossed portion. As the method, the fiber sheet may be stretched from the embossed portion as the base in the same manner as the laminated sheet was stretched from the joint portion in the first embodiment. For example, in the above-mentioned first embodiment, thejoint portion 4 and the large-diameter portion of the concave-convex roll were aligned, and thelaminated sheet 10A with a three-layer structure was inserted into the concave-convex roll. The embossing part is aligned with the position of the large-diameter part of the concave-convex roll, and the single-layer fiber sheet is inserted into the concave-convex roll. the

通过以压花部为基点将具有压花部的纤维片材拉伸，可以防止压花部的破损，同时高效地拉伸除此以外的部分。     By stretching the fibrous sheet having the embossed portion based on the embossed portion, it is possible to efficiently stretch the other portions while preventing damage to the embossed portion. ``

另外，在所得伸缩性片材的两面上分别与上述伸缩性无纺布10同样地形成有沿着与拉伸方向大致垂直的方向延伸的隆起部和凹槽部，该隆起部和该凹槽部在上述拉伸方向上分别交替形成有多个。另外，压花部位于这些隆起部和凹槽部上。对单层纤维片材的拉伸加工也优选在与对上述层叠片材10A进行拉伸加工的条件相同的条件下进行。 In addition, similar to the above-mentionedstretch nonwoven fabric 10, protuberances and grooves extending in a direction approximately perpendicular to the stretching direction were formed on both sides of the obtained stretchable sheet, and the protuberances and the grooves were formed. A plurality of portions are alternately formed in the stretching direction. In addition, embossed portions are located on these raised portions and grooved portions. Stretching of the single-layer fiber sheet is also preferably performed under the same conditions as those of the aforementionedlaminated sheet 10A. the

通过本发明的制造方法获得的伸缩性无纺布(伸缩性片材)还可以在衣服、清扫片材、汽车、家具、寝具等各种用途中使用，特别优选作为与身体相接触的物品、生理用卫生巾或一次性尿布等吸收性物品的构成材料使用。例如，可以作为用于对一次性尿布的腰身部或腰部、腿周部等赋予弹性伸缩性的片材等使用。另外，可以作为形成卫生巾的伸缩性翼部的片材等使用。另外，也可以在即便是除此以外的部位也想赋予伸缩性的部位等中使用。层叠有弹性层和非弹性纤维层的构成(2层或3层结构)的伸缩性无纺布在用于接触于穿戴者肌肤的位置上时，从肌肤触感和防止发粘等的观点出发，优选按照朝向穿戴者的肌肤侧的方式使用非弹性纤维层。本发明的层叠片材或纤维片材的拉伸方法如上述实施方式那样，特别优选在伸缩性无纺布(伸缩性片材)的制造方法中使用，但也可以在除此以外的用途中使用。 The stretchable nonwoven fabric (stretchable sheet) obtained by the production method of the present invention can also be used in various applications such as clothing, cleaning sheets, automobiles, furniture, bedding, etc., and is particularly suitable as articles that come into contact with the body, Used as a constituent material of absorbent articles such as sanitary napkins and disposable diapers. For example, it can be used as a sheet for imparting elastic stretchability to the waist part of a disposable diaper, the waist part, the leg circumference part, and the like. Moreover, it can be used as a sheet|seat etc. which form the elastic wing part of a sanitary napkin. Moreover, it can also be used also in the site|part etc. which want to impart stretchability also to other site|parts. Stretchable non-woven fabrics consisting of laminated elastic layers and non-elastic fiber layers (2-layer or 3-layer structure) are used in a position that contacts the wearer's skin, from the viewpoint of skin touch and stickiness prevention, etc. The inelastic fiber layer is preferably used facing the wearer's skin side. The method for stretching a laminated sheet or a fiber sheet of the present invention is particularly preferably used in a method for producing a stretchable nonwoven fabric (stretchable sheet) as in the above-mentioned embodiment, but it may also be used in other applications. use. the

本发明并不限制于上述实施方式。例如，在第1实施方式中使用的层叠片材10A为3层结构，但也可以同样使用仅在第1纤维层(弹性层)的任何一个面侧上层叠有非弹性纤维层的片材。另外，第1发明的接合部和第2发明的压花部的配置可以并非锯齿状的图案，而是以其它图案形成。层叠片材的接合部或纤维片材的压花部的配置图案可以为多种图案，例如在图2所示图案的MD方向上延伸的上述接合部列在相邻的接合部列之间，接合部的位置可以相同，或者也可以存在3种以上接合部的位置不同的接合部列。在CD方向上使其伸缩时，接合部可以在MD方向上连续；在MD方向上使其伸缩时，接合部可以在CD方向上连续。如果接合部列位于凹凸辊的大径部，则其间可以是接合部。The present invention is not limited to the above-mentioned embodiments. For example, thelaminated sheet 10A used in the first embodiment has a three-layer structure, but a sheet in which a non-elastic fiber layer is laminated only on either side of the first fiber layer (elastic layer) may be similarly used. In addition, the arrangement|positioning of the junction part of 1st invention and the embossed part of 2nd invention may be formed in another pattern instead of a zigzag pattern. The disposition pattern of the joint portion of the laminated sheet or the embossed portion of the fiber sheet can be a variety of patterns, for example, the above-mentioned joint line extending in the MD direction of the pattern shown in Figure 2 is between adjacent joint line columns, The positions of the joints may be the same, or there may be three or more types of joint lines in which the positions of the joints are different. When expanding and contracting in the CD direction, the joining portion may be continuous in the MD direction; and when expanding and contracting in the MD direction, the joining portion may be continuous in the CD direction. If the joining part row is located in the large-diameter part of an uneven|corrugated roll, there may be a joining part in between.

另外，第1发明的接合部也可以不通过热压花形成，而是通过超声波压花、高频压花、粘合剂等形成。第2发明的压花部除了热压花之外，还可以通过超声波压花、高频压花等形成。接合部和压花部的俯视形状除了圆形之外，还可以是椭圆形、三角形、矩形等，或者这些2种以上形状的接合部或压花部也可以形成在层叠片材或纤维片材上。 In addition, the junction part of 1st invention may be formed not by thermal embossing, but ultrasonic embossing, high-frequency embossing, an adhesive agent, etc. may be formed. The embossed part of 2nd invention can also be formed by ultrasonic embossing, high-frequency embossing, etc. other than thermal embossing. The top view shape of the joining portion and the embossing portion may be oval, triangular, rectangular, etc. in addition to a circle, or joining portions or embossing portions of two or more shapes may be formed on a laminated sheet or a fiber sheet. superior. the

进而，在上述各实施方式中，层叠片材或纤维片材是在流动方向的CD方向上拉伸的，但也可以在MD方向上拉伸。 Furthermore, in each of the above-described embodiments, the laminated sheet or the fiber sheet is stretched in the CD direction of the flow direction, but may also be stretched in the MD direction. the

例如，可以使用图6～8所示的拉伸装置。图6所示的拉伸装置具有在相互相对的面上形成有多根在垂直于X方向的方向上延伸的凸条部36的一对凹凸板37，使各凹凸板构成为使用凸轮装置能够变位以便可以扩大缩小相互间的距离。在拉伸层叠片材或纤维片材时，在使层叠片材或纤维片材的MD方向与X方向一致、且层叠片材的接合部或纤维片材的压花部的位置与凹凸板的凸条部相一致的状态下，将两凹凸板从相互间分离的状态变位成咬合的状态(图6所示的状态)。 For example, stretching devices as shown in FIGS. 6 to 8 can be used. The stretching device shown in FIG. 6 has a pair of concave-convex plates 37 formed with a plurality ofconvex strips 36 extending in a direction perpendicular to the X direction on the surfaces facing each other, and each concave-convex plate is configured to be able to use a cam device. Displacement so that the distance between them can be enlarged or reduced. When stretching a laminated sheet or a fiber sheet, the MD direction of the laminated sheet or the fiber sheet is aligned with the X direction, and the position of the joint part of the laminated sheet or the embossed part of the fiber sheet is aligned with the position of the concave-convex plate. In the state where the protruding lines are aligned, the two concave-convex plates are displaced from the state of being separated from each other to the state of being engaged (the state shown in FIG. 6 ). the

图7所示的拉伸装置具有一对履带38，其上分别形成有与图6装置的凸条部同样的凸条部36’。通过从图7中的箭头方向导入层叠片材或纤维片材，可以在其层叠片材或纤维片材上连续地实施MD方向的拉伸加工。 The stretching device shown in FIG. 7 has a pair ofcaterpillar belts 38 on which protruding parts 36' similar to those of the device in FIG. 6 are respectively formed. By introducing the laminated sheet or the fibrous sheet from the direction of the arrow in FIG. 7 , stretching in the MD direction can be continuously performed on the laminated sheet or the fibrous sheet. the

图8所示的拉伸装置为多段齿轮式的拉伸装置，将组合有具有凸条部的齿轮的拉伸部39设置为多段。从下游侧的拉伸部朝向上游侧的拉伸部增大拉伸倍率。 The stretching device shown in FIG. 8 is a multi-stage gear-type stretching device, and the stretchingunit 39 combined with a gear having a convex portion is provided in multiple stages. The draw ratio increases from the stretching section on the downstream side toward the stretching section on the upstream side. the

根据图6～8的拉伸装置，可以以其接合部或压花部为基点将层叠片材或纤维片材在MD方向上拉伸。 According to the stretching device shown in Figs. 6 to 8, the laminated sheet or the fiber sheet can be stretched in the MD direction with the joining portion or the embossed portion as the base point. the

另外，所拉伸的层叠片材的弹性层和实质上为非弹性的层整面地接合在一起，进而即便是部分接合在一起的层叠片材，只要具有接合点强度的差别即可有效地拉伸。作为整面接合的例子，可以列举出利用热熔融等粘合剂的接合、利用纺丝时的熔融热进行熔融粘接的接合、通过热层叠或热风将纤维或薄膜熔融粘接的接合、通过针刺法或水流交织使纤维交织在一起的接合。作为部分接合的例子，可以列举出利用上述热压花、超声波压花、粘合剂的接合。可以以接合点强度高的接合部分为基点实施拉伸加工。 In addition, the elastic layer and the substantially non-elastic layer of the stretched laminated sheet are bonded together over the entire surface, and even a partially bonded laminated sheet can be effectively bonded as long as there is a difference in the strength of the bonding point stretch. Examples of full-surface bonding include bonding using adhesives such as heat fusion, bonding using fusion heat during spinning, bonding fibers or films by thermal lamination or hot air, bonding by A joint in which fibers are interwoven together by needle punching or hydroentanglement. As an example of partial joining, the joining by the said heat embossing, ultrasonic embossing, and an adhesive is mentioned. Stretching can be performed based on the joint portion with high joint strength. the

另外，接合点密度的差别例如在具有利用热熔融整面接合弹性层和实质上为非弹性的层之间、进而利用热密封等部分地接合两者而成的接合部时，是指在热熔融的接合点和利用热密封等所产生的接合点处，接合图案不同、或者在整面接合后进行部分接合时，在两者中的接合图案不同。 In addition, the difference in joint density means, for example, when there is a joint formed by joining the entire surface of the elastic layer and the substantially inelastic layer by thermal fusion, and further partially joining the two by heat sealing or the like, it means The bonding pattern differs between a molten bonding point and a bonding point generated by heat sealing or the like, or when partial bonding is performed after bonding the entire surface, the bonding pattern differs between the two. the

另外，本发明的伸缩性片材还可以仅在片材的一个面上具有上述伸缩性无纺布10的隆起部和凹槽部。另外，可以在隆起部12上形成有上述接合部4，而在凹槽部13上没有形成上述接合部4。另外，伸缩性片材的拉伸方向可以并非是在制造时与机械方向(成为原料的层叠片材等的搬送方向)垂直的宽度方向，还可以是长度方向，另外还可以是相对于宽度方向和长度方向分别成45度的方向等。 In addition, the stretchable sheet of the present invention may have the ridges and grooves of thestretchable nonwoven fabric 10 described above only on one surface of the sheet. In addition, the above-mentionedengaging portion 4 may be formed on the protrudingportion 12 while the above-mentionedengaging portion 4 may not be formed on thegroove portion 13 . In addition, the stretching direction of the stretchable sheet may not be the width direction perpendicular to the machine direction (the conveying direction of the laminated sheets used as raw materials, etc.) at the time of production, but may also be the longitudinal direction, and may also be relative to the width direction. 45 degrees to the length direction, etc. the

根据本发明的伸缩性片材的制造方法，可以高效地制造高伸缩性、手感和外观良好的伸缩性片材。 According to the method for producing a stretchable sheet of the present invention, a stretchable sheet with high stretchability and good texture and appearance can be efficiently produced. the

根据本发明的层叠片材或纤维片材的拉伸方法，可以不破坏纤维层之间的接合部或压花部，高效地拉伸除此以外的部分。 According to the stretching method of the laminated sheet or the fiber sheet of the present invention, the other parts can be stretched efficiently without breaking the joint portion or the embossed portion between the fiber layers. the

本发明的伸缩性片材富有伸缩性、膨松、且缓冲性(在厚度方向上压缩后的厚度回复性)优异。 The stretchable sheet of the present invention is rich in stretchability, bulky, and excellent in cushioning properties (thickness recovery property after being compressed in the thickness direction). the

Claims (6)

Translated fromChinese

1.伸缩性片材的制造方法，其中，使用拉伸装置将含有具有弹性伸缩性的弹性层和为非弹性的非弹性纤维层、且所述两层进行部分接合而成的层叠片材以所述两层彼此的接合部为基点在MD方向上进行拉伸，从而获得伸缩性片材，所述拉伸装置具有在相互相对的面上形成有多根在垂直于MD方向的方向上延伸的凸条部的一对凹凸板，使各凹凸板构成为使用凸轮装置能够变位以便可以扩大缩小相互间的距离，其中在拉伸所述层叠片材时，在使所述层叠片材的MD方向与所述拉伸装置的MD方向一致、且在所述层叠片材的接合部的位置与所述凹凸板的所述凸条部相一致的状态下，将两凹凸板从相互间分离的状态变位成咬合的状态。1. A method for producing a stretchable sheet, wherein a laminated sheet comprising an elastic layer having elastic stretchability and a non-elastic fiber layer which is inelastic and the two layers are partially bonded is formed by using a stretching device. The junction of the two layers is used as the base point to stretch in the MD direction, so as to obtain a stretchable sheet. A pair of concave-convex plates in the protruding part, each concave-convex plate is configured to be displaceable using a cam device so that the distance between them can be enlarged or reduced, wherein when the laminated sheet is stretched, the laminated sheet The MD direction coincides with the MD direction of the stretching device, and the two uneven plates are separated from each other in a state where the joint portion of the laminated sheets coincides with the convex line portion of the uneven plate. The state changes to the occlusal state.2.伸缩性片材的制造方法，其中，使用拉伸装置将含有弹性成分和为非弹性的成分、且形成有通过压花加工产生的部分压花部的纤维片材以所述压花部为基点在MD方向上进行拉伸，从而获得伸缩性片材，所述拉伸装置具有在相互相对的面上形成有多根在垂直于MD方向的方向上延伸的凸条部的一对凹凸板，使各凹凸板构成为使用凸轮装置能够变位以便可以扩大缩小相互间的距离，其中在拉伸所述纤维片材时，在使所述纤维片材的MD方向与所述拉伸装置的MD方向一致、且在所述纤维片材的接合部的位置与所述凹凸板的所述凸条部相一致的状态下，将两凹凸板从相互间分离的状态变位成咬合的状态。2. A method for producing a stretchable sheet, wherein a fibrous sheet containing an elastic component and a non-elastic component and having a partially embossed portion formed by embossing is formed with the embossed portion using a stretching device. Stretching in the MD direction as a base point, thereby obtaining a stretchable sheet, the stretching device has a pair of concavities and convexities formed with a plurality of ridges extending in a direction perpendicular to the MD direction on surfaces facing each other Plates, so that each concave-convex plate is configured to be displaceable using a cam device so that the distance between them can be enlarged or reduced. When stretching the fiber sheet, the MD direction of the fiber sheet is aligned with the stretching device. In a state where the MD directions of the fibrous sheets are aligned and the position of the joining portion of the fiber sheet coincides with the convex line portion of the uneven plate, the two uneven plates are displaced from a state of being separated from each other to a state of being engaged. .3.伸缩性片材的制造方法，其具有下述拉伸工序：将含有具有弹性伸缩性的弹性层和为非弹性的非弹性纤维层，且两层进行部分接合而成的带状层叠片材，或者含有弹性成分和为非弹性的成分，且形成有通过压花加工产生的部分压花部的带状纤维片材插入在一对凹凸辊之间，所述一对凹凸辊为在轴长方向上交替形成有大径部和小径部的一对凹凸辊，并按照一个凹凸辊的大径部松弛地嵌入在另一个凹凸辊的大径部之间的方式组合在一起；其中，在所述拉伸工序中，使所述层叠片材或所述纤维片材的宽度方向或长度方向或相对于宽度方向和长度方向分别成45度的方向上的所述两层彼此的接合部或所述压花部的位置与凹凸辊的大径部的位置一致，使所述层叠片材或所述纤维片材在其宽度方向或长度方向或相对于宽度方向和长度方向分别成45度的方向上拉伸。3. A method for producing a stretchable sheet, comprising a stretching step: a belt-shaped laminated sheet comprising an elastic layer having elastic stretchability and a non-elastic non-elastic fiber layer, and partially joining the two layers material, or a belt-shaped fiber sheet containing an elastic component and a non-elastic component, and formed with a partial embossed portion produced by embossing, is inserted between a pair of concave-convex rollers that are on the shaft A pair of concave-convex rollers with large-diameter parts and small-diameter parts alternately formed in the long direction are combined together in such a way that the large-diameter part of one concave-convex roller is loosely embedded between the large-diameter parts of the other concave-convex roller; wherein, in In the stretching step, the joints or joints of the two layers in the width direction or the length direction of the laminated sheet or the fiber sheet or in a direction that is 45 degrees with respect to the width direction and the length direction, respectively, are adjusted. The position of the embossing part is consistent with the position of the large-diameter part of the concave-convex roller, so that the laminated sheet or the fiber sheet is at an angle of 45 degrees in the width direction or the length direction or relative to the width direction and the length direction, respectively. Stretch in direction.4.伸缩性片材，其含有具有弹性伸缩性的弹性层和为非弹性的非弹性纤维层，且两层接合的接合部形成在片材的拉伸方向的多个位置上，其中，在所述伸缩性片材的至少一个面上形成分别沿着与所述拉伸方向大致垂直的方向延伸的隆起部和凹槽部，该隆起部和该凹槽部在所述拉伸方向上交替形成，且分别形成有多个，所述接合部至少位于所述隆起部上，所述伸缩性片材的截面在微观上为波浪形状。4. A stretchable sheet comprising an elastic layer having elastic stretchability and an inelastic non-elastic fiber layer, and joints where the two layers are joined are formed at a plurality of positions in the stretching direction of the sheet, wherein, in At least one surface of the stretchable sheet is formed with ridges and grooves respectively extending in a direction approximately perpendicular to the stretching direction, and the ridges and grooves alternate in the stretching direction Formed, and respectively formed a plurality of, the joint portion is located at least on the raised portion, and the section of the stretchable sheet is wave-shaped microscopically.5.伸缩性片材，其含有弹性成分和为非弹性的成分，且通过压花加工产生的部分压花部形成在片材的拉伸方向的多个位置上，其中，在所述伸缩性片材的至少一个面上形成分别沿着与所述拉伸方向大致垂直的方向延伸的隆起部和凹槽部，该隆起部和该凹槽部在所述拉伸方向上交替形成，且分别形成有多个，所述压花部至少位于所述隆起部上，所述伸缩性片材的截面在微观上为波浪形状。5. A stretchable sheet comprising an elastic component and a non-elastic component, and partially embossed portions produced by embossing are formed at a plurality of positions in the stretching direction of the sheet, wherein the stretchable At least one surface of the sheet is formed with ridges and grooves respectively extending in a direction approximately perpendicular to the stretching direction, the ridges and the grooves are alternately formed in the stretching direction, and respectively A plurality of embossed parts are formed, the embossed part is located at least on the raised part, and the cross section of the elastic sheet is wave-shaped microscopically.6.权利要求4或5所述的伸缩性片材，其中，在所述伸缩性片材的两面上形成有所述隆起部和所述凹槽部，在所述拉伸方向上，所述伸缩性片材的一个面的隆起部的位置与另一个面的凹槽部的位置一致。6. The stretchable sheet according to claim 4 or 5, wherein the raised portion and the groove portion are formed on both sides of the stretchable sheet, and in the stretching direction, the The positions of the raised portions on one surface of the stretchable sheet coincide with the positions of the grooved portions on the other surface.

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