CN112356475A

Movatterモバイル変換

Info

Publication number: CN112356475A
Application number: CN202011416415.9A
Authority: CN
Inventors: 龚立锋
Original assignee: Deqing Sunny Plastic Products Co Ltd
Current assignee: Deqing Sunny Plastic Products Co Ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-02-12
Anticipated expiration: 2040-12-04
Also published as: CN112356475B

Abstract

The invention discloses a production process of a slider type sealing bag sealing strip, a jig and extrusion equipment thereof, and the process comprises the following steps: mixing non-linear low density polyethylene, a first class of metallocene polyethylene, a second class of metallocene polyethylene and high density polyethylene to form a first mixture; mixing a non-linear low density polyethylene and a linear low density polyethylene into a second mixture; heating the two mixtures and the four types of metallocene polyethylene into melts, respectively adding the two mixtures into a first cavity of a jig through extrusion equipment, adding the four types of metallocene polyethylene into a second cavity of the jig, and converging the three melts in a discharge cavity of the jig to form a preformed clip chain attached with the four types of metallocene polyethylene on one side of a leaf of a rib; and then cooling and reducing to obtain a finished product clamping chain, and using a chain combining machine to combine the chain to obtain the sealing strip. The sealing strip produced by the production process has high strength, strong tensile strength and excellent performance in application of the sealing bag.

Description

Production process of slider type sealing bag sealing strip, jig and extrusion equipment thereof

Technical Field

The invention relates to the technical field of plastic production and manufacturing, in particular to a production process of a slider type sealing bag sealing strip, a jig and extrusion equipment thereof.

Background

The slider type sealing bag is a common sealing bag which is convenient to open and close, is widely applied to various fields of object sealing, food preservation and the like, and can prevent the sealed object from being influenced by external dirt or moisture and the like.

In the current production process of the sealing bag, the material of the sealing strip mainly has two forms, one is a single material, and the mode usually causes the performance of the sealing strip to be too single and cannot well take into account all performance requirements of the sealing bag. And the other method adopts a mixture, namely, after a plurality of materials are mixed, the mixture is extruded and plasticized by an extruding device to form the sealing strip, the performance of the sealing strip produced by the method is superior to that of the sealing strip made of a single material to a certain extent, but the performance of each part of the produced sealing strip is almost consistent because all the materials are mixed and then extruded and plasticized, and therefore, all the requirements of the sealing bag cannot be well met. For example, the sealing strip has to be stiff, and the strips have to be tough and tear resistant, and at the same time suitable for low temperature applications, which cannot be met by single materials or mixed materials.

The intensity of current production technology production sealing strip is not enough, pulling force bearing capacity in horizontal is less than 3 pounds, be less than 5 pounds at perpendicular ascending pulling force bearing capacity, and the bone strip is softer, bone strip leaf toughness is not enough, the required laminating temperature of sealing strip when laminating with the sealed bag body is higher, this will lead to especially bag body film through tensile, after high temperature laminating cooling, bag body film can shrink deformation, lead to the sealing strip to receive the influence of film shrink to become curved, the bag body takes place the fold, thereby influence the outward appearance, still take place to tear in laminating department easily when serious, lead to forming the defective products. In addition, limited by the existing production process formula, when equipment is produced for about three hours, a die needs to be cleaned, otherwise, coke materials at the edge of the die are easy to adhere to the sealing strip, so that a defective product can be formed, the continuous production time is short, and the production efficiency is not high.

Therefore, in combination with the above-mentioned technical problems, a new technical solution is needed.

Disclosure of Invention

The invention aims to provide a production process of a slider type sealing bag sealing strip, which can obtain the sealing strip with excellent characteristics, fuses a mixture of two specific materials in proportion to form a clip chain of the sealing strip by using a jig and an extrusion device, and coats a layer of low-temperature material on bone strip leaves of the clip chain to ensure that the bone strip leaves of the sealing strip can be bonded with a bag body of the sealing bag at low temperature during production of the sealing bag, so that the shrinkage degree of the bag body is reduced, the bonded sealing strip is basically in a straight state, and the sealing bag is more attractive. The specific scheme is as follows:

according to one aspect of the invention, the invention provides a production process of a slider type sealing bag sealing strip, which comprises the following steps: step S1: mixing non-linear low-density polyethylene, first-class metallocene polyethylene, second-class metallocene polyethylene and high-density polyethylene according to a set weight ratio to obtain a first mixture for forming the chain clamping bone strip; mixing nonlinear low-density polyethylene, linear low-density polyethylene and three types of metallocene polyethylene according to a set weight ratio to obtain a second mixture for forming the leaves of the chain clamping strips; step S2: respectively heating the first mixture, the second mixture and the four types of metallocene polyethylene by using an extrusion device to form melts; step S3: respectively adding the first mixture and the second mixture into a first cavity of a jig through the extrusion equipment, adding the four types of metallocene polyethylene into a second cavity of the jig, and converging the three types of melts in a discharge cavity of the jig to form a preformed clip chain attached with the four types of metallocene polyethylene at one side of the bone strip leaves; step S4: drawing the preformed clip chain formed in the step S3 into a cooling device through a drawing device for cooling to form a semi-finished clip chain; step S5: placing the semi-finished product clip chain obtained in the step S4 in a space with a set temperature for a set time to form a finished product clip chain; step S6: and (5) using a chain combining machine to combine the chains to form the finished sealing strip.

Further, the melt index of the nonlinear low density polyethylene ranges from 2 to 5g/10 min; the melt index range of the linear low-density polyethylene is 0.5-2.5g/10 min; the melt index range of the metallocene polyethylene is 0.2-1.2g/10 min; the melt index range of the second metallocene polyethylene is 3-5g/10 min; the melt index range of the high-density polyethylene is 0.5-1g/10 min; the melt index range of the three types of metallocene polyethylene is 0.2-5g/10 min; the melt index range of the four types of metallocene polyethylene is 0.5-2.5g/10 min.

Further, the density of the metallocene polyethylene is 0.93-0.95g/m³(ii) a The density of the second metallocene polyethylene is 0.93-0.95g/m³(ii) a The density of the three types of metallocene polyethylene ranges from 0.85 to 0.95g/m³(ii) a The density of the four types of metallocene polyethylene ranges from 0.91 to 0.92g/m³. Further, the first mixture comprises the following components in parts by weight: non-linear low density polyethylene: 35% -42%, linear low density polyethylene: 10% -15%, a metallocene polyethylene: 5% -9%, metallocene polyethylene of two types: 20% -30%, high density polyethylene: 10% -15%; the second mixture comprises the following components in parts by weight: non-linear low density polyethylene: 40% -60%, linear low density polyethylene: 10% -20%, three types of metallocene polyethylene: 30 to 40 percent.

Further, the first mixture comprises the following components in parts by weight: non-linear low density polyethylene: 39% -41%, linear low density polyethylene: 13% -14%, a metallocene polyethylene: 6% -7%, metallocene polyethylene of two types: 26% -27%, high density polyethylene: 13% -14%; the second mixture comprises the following components in parts by weight: non-linear low density polyethylene: 49% -51%, linear low density polyethylene: 16% -17%, three types of metallocene polyethylene: 33 to 34 percent.

Further, the cooling device used in the step S4 is a constant temperature water tank, the pre-formed clip chain is pulled into the constant temperature water tank by a pulling device for cooling, the temperature of cooling water in the constant temperature water tank is 26-30 ℃, and clip chains with different sizes are obtained by controlling the pulling speed of the pulling device, the extrusion speed of the extrusion device and the liquid level height of the cooling water in the constant temperature water tank; in step S6, when the zipper is closed by the zipper closing machine, the side of the four types of metallocene polyethylene provided on the framework leaves of the two types of zipper is respectively directed to the outer side of the sealing strip.

According to another aspect of the present invention, the present invention further provides a jig for a slider-type sealing bag sealing strip, which has a plate-shaped structure, and has a first side surface and a second side surface, the jig is respectively provided with two sets of cavities penetrating through the first side surface and the second side surface along a thickness direction of the jig, each set of cavity includes a first cavity having a set shape and a second cavity having a set shape, the first cavity and the second cavity respectively penetrate through the first side surface, the first cavity and the second cavity are communicated in the jig to form a discharging cavity, and the discharging cavity penetrates through the second side surface of the jig.

Further, first die cavity includes bone strip chamber and bone strip leaf chamber, bone strip leaf chamber with bone strip chamber intercommunication, the second die cavity is located one side of bone strip leaf chamber, the second die cavity with bone strip leaf chamber intercommunication.

According to another aspect of the invention, the invention further provides an extrusion device of the slider type sealing bag sealing strip, which comprises a die head, and a first extrusion unit, a second extrusion unit and a third extrusion unit which are respectively communicated with the die head, wherein each extrusion unit comprises an extrusion device, the extrusion device comprises a material barrel and a screw rod arranged in the material barrel, the material barrel is provided with a material inlet and a material outlet, the screw rod can heat the material in the material barrel, and the screw rod can be driven to rotate in the material barrel so as to extrude the material in the material barrel from the material outlet into the die head.

Furthermore, two groups of discharging cavities are respectively arranged on the die head, the discharging cavities are respectively communicated with the outside of the die head, each group of discharging cavities comprises a first discharging cavity, a second discharging cavity and a third discharging cavity, the first extruding unit is communicated with the first discharging cavity, the second extruding unit is communicated with the second discharging cavity, and the third extruding unit is communicated with the third discharging cavity; each extrusion unit also comprises at least one heating device, and a discharge hole of the extrusion device is communicated with a discharge cavity in the die head through the heating device.

Compared with the prior art, the production process of the slider type sealing bag sealing strip has one or more of the following beneficial effects:

(1) the sealing strip produced by the production process of the sliding block type sealing bag sealing strip can bear more than 7 pounds of pulling force in the opening direction or the closing direction, namely, the welding parts at the two sides of the sealing strip have stronger transverse pulling force bearing capacity compared with the prior art;

(2) the bearing capacity of the sealing strip produced by the production process of the sliding block type sealing bag sealing strip in the vertical direction is more than 10 pounds;

(3) the sealing strip produced by the production process of the sliding block type sealing bag sealing strip has excellent sealing property, and does not leak water or leak water;

(4) when the sealing strip produced by the production process of the sliding block type sealing bag sealing strip is used for producing the sealing bag, no matter the bag body attached to the bone strip leaves is a thin film or a thick film, the attached part is not easy to tear;

(5) according to the production process of the slider type sealing bag sealing strip, the material formula is improved, the performance of mixed materials is more excellent, the equipment can continuously produce for more than six hours, and the yield is higher;

(6) when the sealing strip produced by the production process of the sliding block type sealing bag sealing strip is used for producing the sealing bag, compared with the prior art, the transparency and the stiffness of the bag body with the same thickness are more transparent and stiffer;

(7) through the sealing strip of the production technology production of slider formula sealing bag sealing strip of this application, when producing the sealing bag, the laminating temperature of heat laminating sword compares prior art lower, when laminating bag body and bone strip leaf, and the shrink degree of the bag body is lower, and the sealing strip after the laminating is straight state basically.

Drawings

FIG. 1 is a schematic diagram of a part of the structure of an extrusion apparatus used in a production process provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of an extruding device used in a production process provided in an embodiment of the present application in a top view direction;

fig. 3 is a schematic structural diagram of an extruding device used in a production process provided by an embodiment of the present application in a front view direction;

fig. 4 is a schematic structural diagram of a screw in an extruding device used in the production process according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of an extruding device used in the production process provided by the embodiment of the present application in a side view direction;

FIG. 6 is a schematic structural view of a die head used in the production process provided in the examples of the present application, viewed from the bottom;

fig. 7 is a schematic structural view of a jig used in the manufacturing process according to an embodiment of the present disclosure in a top view direction;

fig. 8 is a schematic structural view of a jig used in the manufacturing process according to the embodiment of the present application in a bottom view direction;

FIG. 9 is a schematic cross-sectional view taken at A in FIG. 7;

fig. 10 is a schematic partial structural view of a slider type sealed bag according to an embodiment of the present application.

Wherein, 1-clip chain, 11-bone strip, 12-bone strip leaf, 2-slide block, 3-bag body, 4-four types of metallocene polyethylene layer, 5-extrusion device, 51-first extrusion unit, 52-second extrusion unit, 53-third extrusion unit, 54-extrusion device, 541-material cylinder, 5411-material inlet, 5412-material outlet, 542-screw rod, 55-die head, 551-first material outlet cavity, 552-second material outlet cavity, 553-third material outlet cavity, 554-positioning pin, 56-heating device, 6-jig, 61-first side surface, 62-second side surface, 63-first cavity, 631-bone strip cavity, 632-bone strip leaf cavity, 64-second cavity and 65-material outlet cavity, 66-positioning hole, 67-fixing hole.

Detailed Description

To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention will be given with reference to the accompanying drawings and preferred embodiments.

Referring to fig. 1 to 10, fig. 1 is a schematic partial structural view of an extrusion apparatus used in a production process according to an embodiment of the present disclosure; fig. 2 is a schematic structural diagram of an extruding device used in a production process provided in an embodiment of the present application in a top view direction; fig. 3 is a schematic structural diagram of an extruding device used in a production process provided by an embodiment of the present application in a front view direction; fig. 4 is a schematic structural diagram of a screw in an extruding device used in the production process according to an embodiment of the present application; fig. 5 is a schematic structural diagram of an extruding device used in the production process provided by the embodiment of the present application in a side view direction; FIG. 6 is a schematic structural view of a die head used in the production process provided in the examples of the present application, viewed from the bottom; fig. 7 is a schematic structural view of a jig used in the manufacturing process according to an embodiment of the present disclosure in a top view direction; fig. 8 is a schematic structural view of a jig used in the manufacturing process according to the embodiment of the present application in a bottom view direction; FIG. 9 is a schematic cross-sectional view taken at A in FIG. 7; fig. 10 is a schematic partial structural view of a slider type sealed bag according to an embodiment of the present application.

In order to better show the position relationship between the die head and each cavity on the jig, the bottom views shown in fig. 6 and 8 are mirror images.

Examples

The embodiment provides a production process of a slider type sealing bag sealing strip, which comprises the following steps:

step S1: mixing the non-linear low-density polyethylene, the first kind of metallocene polyethylene, the second kind of metallocene polyethylene and the high-density polyethylene according to the set weight ratio to obtain a first mixture for forming thebone strips 11 of theclip chain 1. Mixing the nonlinear low density polyethylene, the linear low density polyethylene and the three types of metallocene polyethylene according to the set weight ratio to obtain a second mixture for forming thebone strip 12 of theclip chain 1.

Wherein the density characteristics of the materials are as follows: the higher the density, the stiffer and harder the hand feeling of the finished product, the less likely it is to bend or deform; the melt index characteristics of each material are as follows: the higher the melt index, the better the fluidity, and the easier the molding, but the scorch and the formation of scorched particles are likely to occur. Of course, the selection of the material grade is only the preferred scheme, and other types of materials can be adopted, such as the second mixtureThe nonlinear low-density polyethylene may be a C125Y type nonlinear low-density polyethylene having a density of 0.921g/m, which is produced by Petlin Co³The melt index is 2.5g/10min, and for example, in the second mixture, the third metallocene polyethylene can also be a 8315 type metallocene polyethylene manufactured by Sabic, Inc., and its density is 0.915g/m³The melt index is 3g/10 min. The purpose of selecting the above parameter materials is mainly to enable thebone strip 11 part of the sealingstrip clip chain 1 obtained by the production process to be hard enough and stiff enough, the tear strength of thebone strip leaf 12 part of theclip chain 1 to be strong enough, and the material attached to one side of thebone strip leaf 12 to be suitable for low-temperature lamination.

When mixing materials, respectively adding the required different materials into a mixer according to a set weight ratio for uniform stirring, so that the materials are uniformly mixed to obtain a mixture. If the water content in the material is lower than 16%, uniformly stirring the material for 25-30min at the stirring speed of 960 r/min. Of course, the stirring time and speed are only preferred, and can be adjusted according to the total amount of the stirred materials in specific implementation. If the water content in the material is higher than 16%, the material needs to be dried before mixing, the drying temperature is 60-80 ℃, and the drying time is 45-60 min. Of course, the materials can also be stirred and dried at the same time, and stirred for 45-60min at a constant speed of 960r/min at the temperature of 60-80 ℃. Again, this stirring time and speed is only preferred and may be adjusted in practice depending on the total amount of material being stirred. The water content of the material is controlled to ensure the drying of material particles, so that the phenomenon that crystal points appear in the process of extruding theclamping chain 1 to influence the quality of the sealing strip can be avoided.

Step S2: the first mixture, the second mixture and the four types of metallocene polyethylene are heated separately using anextrusion apparatus 5 to form a melt. Preferably, the four types of metallocene polyethylene are 2012 type metallocene polyethylene produced by ExxonMobil company and the density of the metallocene polyethylene is 0.912g/m³The melt index is 2g/10 min. Similarly, the materials need to be dried before the four types of metallocene polyethylene are heated, the drying temperature is 60-80 ℃, and the drying time is 45-60 min.

As shown in fig. 1, theextrusion apparatus 5 includes adie 55 and afirst extrusion unit 51, asecond extrusion unit 52, and athird extrusion unit 53 respectively communicating with thedie 55. Each extrusion unit comprises anextrusion device 54, theextrusion device 54 comprises amaterial barrel 541 and ascrew 542 arranged in thematerial barrel 541, and amaterial inlet 5411 and amaterial outlet 5412 are arranged on thematerial barrel 541, as shown in fig. 2-5. Thescrew 542 can heat the material in thebarrel 541, and thescrew 542 can be driven to rotate in thebarrel 541, so as to extrude the material in thebarrel 541 from thedischarge opening 5412 into thedie head 55. Thedie head 55 is provided with two groups of discharging cavities, the discharging cavities are respectively communicated with the outside of thedie head 55 and penetrate through the bottom end face of thedie head 55, and when thejig 6 is arranged at the bottom end of thedie head 55, materials can be guaranteed to be extruded into the cavity of thejig 6 through the discharging cavities of thedie head 55. Each set of discharge chambers includes afirst discharge chamber 551, asecond discharge chamber 552, and athird discharge chamber 553, as shown in fig. 6. Thefirst extrusion unit 51 is in communication with the first dischargingchamber 551, thesecond extrusion unit 52 is in communication with the second dischargingchamber 552, and thethird extrusion unit 53 is in communication with the third dischargingchamber 553. In specific implementation, in order to improve the working efficiency and reduce the labor cost, an automatic suction machine may be used to suck the material to be heated into thecylinder 541 of thecorresponding extrusion device 54, that is, the first mixture is added into thecylinder 541 of thefirst extrusion unit 51, the second mixture is added into thecylinder 541 of thesecond extrusion unit 52, and the four types of metallocene polyethylene are added into thecylinder 541 of thethird extrusion unit 53.

In order to ensure the quality of the melt extruded by theextrusion device 5, at least oneheating device 56 is further arranged between thedischarge port 5412 of eachextrusion device 54 and thedie head 55, i.e. thedischarge port 5412 of eachextrusion device 54 is communicated with a discharge cavity in thedie head 55 through theheating device 56. One ormore heating devices 56 and the extrudingdevice 54 form a plurality of heating temperature zones with uniformly increasing temperatures, so that a better melting effect on the material is obtained, and high-quality melt extruded into thedie head 55 is guaranteed. Preferably, the temperature of the first temperature zone is 150 ℃, the temperature of the second temperature zone is 150-161 ℃, the temperature of the third temperature zone is 161-172 ℃, the temperature of the fourth temperature zone is 172-183 ℃, the temperature of the fifth temperature zone is 183-194 ℃, and the temperature of the sixth temperature zone is 194-205 ℃.

Step S3: the first mixture and the second mixture which are in a molten state are respectively added into afirst cavity 63 of thejig 6 through theextrusion equipment 5, four types of metallocene polyethylene which are in a molten state are added into asecond cavity 64 of thejig 6, and the three types of melts are converged in adischarge cavity 65 of thejig 6 to form a preformed clip chain attached with four types ofmetallocene polyethylene layers 4 on one side of the framework leaves 12.

Thejig 6 is a plate-shaped structure and has afirst side surface 61 and asecond side surface 62, two sets of cavities penetrating through thefirst side surface 61 and thesecond side surface 62 are respectively formed in thejig 6 along the thickness direction of the jig, and each set of cavities includes afirst cavity 63 having a set shape and asecond cavity 64 having a set shape, as shown in fig. 7. Two groups of cavities are two clampingchains 1 which can be clamped with each other and are used for producing the sealing strip. Thefirst cavity 63 and thesecond cavity 64 respectively penetrate through thefirst side surface 61. Thefirst cavity 63 and thesecond cavity 64 are communicated with each other to form a dischargingcavity 65 in thejig 6, and the dischargingcavity 65 penetrates through thesecond side surface 62 of thejig 6, as shown in fig. 8 and 9. Thefirst cavity 63 includes abone strip cavity 631 and a bonestrip leaf cavity 632, the bonestrip leaf cavity 632 being in communication with thebone strip cavity 631. The two sets of cavity bonestrip leaf cavities 632 are the same size and shape and are also elongated long cavities, as shown in fig. 7 and 8. Preferably, the length directions of the two groups of cavities are arranged along the length direction of thejig 6, and the two groups of cavities are arranged at intervals. The length direction of the bone strip leaves 12 in each set of cavities is also consistent with the length direction of thejig 6, and thebone strip cavity 631 is positioned at one side of the length direction of the bonestrip leaf cavity 632. Thebone strip cavity 631 and the bonestrip blade cavity 632 of each set of cavities are completely communicated in thejig 6, namely, one cavity is divided into thebone strip cavity 631 and thebone strip blade 12. Therib cavity 631 is a sub-cavity with one side provided with a plurality of sub-cavities for forming a rib buckling structure, and the shapes of the sub-cavities of therib cavities 631 in the two groups of cavities are correspondingly arranged, so that two producedclamp chains 1 can be perfectly clamped together to complete chain combination. Thesecond cavity 64 is located on one side of therib leaf cavity 632, preferably on one side of thefirst cavity 63 provided with the sub-cavity, so that when the chains are closed, one side of the fourmetallocene polyethylene layers 4 on the rib leaves 12 of the twoclamp chains 1 respectively faces the outer side of the sealing strip. Thesecond cavity 64 communicates with thebone slat cavity 632. When thejig 6 is installed on thedie head 55, thebone strip cavity 631 on thejig 6 is communicated with the first dischargingcavity 551, the bonestrip blade cavity 632 on thejig 6 is communicated with the second dischargingcavity 552, and thesecond die cavity 64 on thejig 6 is communicated with the third dischargingcavity 553.

It will be appreciated that, because thebone strip 11 is larger in size than thebone strip leaf 12, thebone strip chamber 631 is larger in size than the bonestrip leaf chamber 632, and therefore more material must be packed into thebone strip chamber 631. In specific implementation, the extrusion capacity of the first extrusion device is larger than that of the other two extrusion devices. And because therib cavity 631 is communicated with therib leaf cavity 632, the pressures of the two melts in thefirst cavity 63 of thejig 6 are basically consistent by controlling the extrusion speed ratio between the two extrusion devices, so that most of the first mixed material and the second mixed material in the melts are respectively located in the cavities of thejig 6, and a pre-forming clip chain formed by combining the two mixed materials is formed. Similarly, at the dischargingcavity 65 of thejig 6, thesecond cavity 64 is also communicated with therib blade cavity 632, so that the extrusion speed ratio between the third extrusion device and the second extrusion device needs to be controlled, and the four metallocene polyethylene materials in thesecond cavity 64 can be smoothly extruded from the dischargingcavity 65 of thejig 6 together with the two mixed materials.

Thejig 6 is further provided with a plurality of fixingholes 67 and a plurality of positioning holes 66, the bottom end surface of thedie head 55 is also provided with the fixing holes 67 at positions corresponding to the fixing holes 67 of thejig 6, positioning pins 554 are arranged at positions corresponding to the positioning holes 66 of thejig 6, thejig 6 can be fixedly mounted at the bottom end of thedie head 55 through the fixing holes 67 by using fasteners such as bolts, and the positioning pins 554 and the positioning holes 66 are positioned. It should be noted that thejig 6 and the bottom end surface of thedie head 55 need to have a certain smoothness, so as to ensure the tightness between thejig 6 and the bottom end surface of thedie head 55.

Step S4: and drawing the preformed clip chain formed in the step S3 to a cooling device through a drawing device for cooling to form a semi-finished clip chain. The cooling equipment is a constant-temperature water tank, and the pre-forming clamp chain is pulled into the constant-temperature water tank by the pulling equipment to be cooled. The water cooler can be connected to the water tank, so that the cooling water in the water tank can be kept at a constant temperature. The cooling water in the constant temperature water tank is 26-30 ℃. Theclamp chains 1 with different sizes are obtained by controlling the traction speed of the traction equipment, the extrusion speed of theextrusion equipment 5 and the liquid level height of cooling water in the constant-temperature water tank. During production, due to the extrusion effect of theextrusion device 5, the preformed clip chain in a melt shape at the position close to the dischargingcavity 65 of thejig 6 is thicker and wider, and the traction effect of the traction device on the preformed clip chain can be adjusted by adjusting the traction speed of the traction device. At a set extrusion speed of theextrusion device 5, the preformed clip chain is still in a plastic stage when extruded by thejig 6, so that a narrower or thinner preformed clip chain can be obtained by increasing the traction speed of the traction device. Meanwhile, the preformed clip chain is cooled and shaped after being cooled by the cooling water, and the size of the preformed clip chain can hardly change under the traction of the traction equipment, so that the traction time and the traction distance of the traction equipment to the preformed clip chain before being cooled can be adjusted by adjusting the liquid level height of the cooling water, namely the distance between the cooling water and thejig 6, and the width or the thickness of the producedclip chain 1 can be adjusted. It is to be understood that the lower the cooling water level, i.e. the further between the cooling water level distances, the thinner and narrower the resultingclip chain 1.

In order to better realize traction, one or more roll shafts can be arranged in the constant-temperature water tank, and the roll shafts are all arranged below the cooling water level of the constant-temperature water tank, preferably close to the bottom of the constant-temperature water tank, so that the cooling time is increased. The preforming clip chain is extruded through thejig 6 to form a linear melt, one end of the preforming clip chain penetrates through the lower portion of the roll shaft, and then the cooled preforming clip chain is pulled by the traction equipment, so that the preforming clip chain can be always located in cooling water of the cooling equipment during cooling, and the cooling effect is further guaranteed.

Step S5: thesemi-finished product zipper 1 with ideal quality can be obtained only after reduction of the extruded and cooled semi-finished product zipper, so that the sealing property of the sealing strip is ensured. And (5) placing the semi-finished product clip chain obtained in the step (S4) in a space with a set temperature for a set time to reduce to form a finished product clip chain. Preferably, the semi-finished product chain clip is placed in an environment with the temperature of not less than 20 ℃ for reduction for a set time. For example, if the outdoor temperature is higher than 20 ℃, the semi-finished clip chain can be placed indoors and naturally placed for 1 hour for reduction. And if the outdoor temperature is lower than 20 ℃, placing the semi-finished product clip chain in a sealed space with the temperature higher than 20 ℃ for not less than 3 hours for reduction. Wherein, the temperature in the sealed space can be ensured by the electric heating drying device.

Step S6: and (5) using a chain combining machine to combine the chains to form the finished sealing strip. When the chain combining machine is used for chain combining, one side of the fourmetallocene polyethylene layers 4 arranged on the rib leaves 12 of the twoclip chains 1 respectively faces the outer side of the sealing strip, so that the sealing strip with the fourmetallocene polyethylene layers 4 arranged on the outer side of the rib leaves 12 is formed.

In this embodiment, a specific structure of a slider type sealed bag is schematically provided, as shown in fig. 10. The slider formula sealing bag includes the bag body 3, and the sealing strip setting is in the opening part of the bag body 3, it is provided with glidingslider 2 of its length direction to slide on the sealing strip. When producing the sealing bag, need carry out the intercepting to the sealing strip according to the size of the sealing bag of producing to utilize modes such as ultrasonic bonding to weld the both ends of sealing strip length direction simultaneously, can guarantee thatslider 2 is in can not follow when sliding on the sealing strip roll-off on the sealing strip. The opening part of the bag body 3 is sleeved with the sealing stripbone strip leaf 12 outside, namely thebone strip leaf 12 is provided with one side of fourmetallocene polyethylene layers 4, and thebone strip leaf 12 is attached to the bag body 3 through a heat attaching knife, and then is shaped through a cooling knife. The slidingblock 2 can slide on the sealing strip, so that the twoclip chains 1 of the sealing strip can be in a buckled or unbuckled state. It should be noted that in order to ensure the adhesion between the sealing strip and the bag 3 and reduce the production cost, in the implementation, the four types of metallocene polyethylene may be coated only on the partial area of the rib leaves 12 near the bottom end, but the coated four types of metallocene polyethylene need to be able to completely cover all the area heated by the heat-adhering knife.

According to trial production, the production process of the sealing strip effectively reduces the bonding temperature between the sealing strip and the bag body 3 while ensuring the excellent performance of the sealing strip, for example, the 2012 type metallocene polyethylene produced by ExxonMobil is adopted by the four types of metallocene polyethylene, and after trial production, the temperatures of the upper and lower hot bonding knives are 252 ℃ and 298 ℃ respectively when the hot bonding knife is used for bonding, and compared with the bonding temperatures of the upper and lower hot bonding knives 276 ℃ and 325 ℃ before improvement, the bonding temperature is obviously reduced.

The production process of the slider type sealing bag sealing strip at least has one or more of the following beneficial effects compared with the prior art:

(4) when the sealing strip produced by the production process of the sliding block type sealing bag sealing strip is used for producing the sealing bag, the joint part is not easy to tear no matter the bag body 3 jointed on the bone strip leaves 12 is a thin film or a thick film;

(6) when the sealing strip produced by the production process of the sliding block type sealing bag sealing strip is used for producing the sealing bag, compared with the prior art, the transparency and the stiffness of the bag body 3 with the same thickness are more transparent and stiffer;

(7) through the sealing strip of the production technology production of slider formula sealing bag sealing strip of this application, when producing the sealing bag, the laminating temperature of heat laminating sword compares prior art lower, when laminating bag body 3 andbone strip leaf 12, the degree of contraction of the bag body 3 is lower, and the sealing strip after the laminating is straight state basically.

As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.

In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

The features of the embodiments and embodiments described herein above may be combined with each other without conflict.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The production process of the slider type sealing bag sealing strip is characterized by comprising the following steps:

step S1: mixing non-linear low-density polyethylene, first-class metallocene polyethylene, second-class metallocene polyethylene and high-density polyethylene according to a set weight ratio to obtain a first mixture for forming the chain clamping bone strip;

mixing nonlinear low-density polyethylene, linear low-density polyethylene and three types of metallocene polyethylene according to a set weight ratio to obtain a second mixture for forming the leaves of the chain clamping strips;

step S2: respectively heating the first mixture, the second mixture and the four types of metallocene polyethylene by using an extrusion device to form melts;

step S3: respectively adding the first mixture and the second mixture into a first cavity of a jig through the extrusion equipment, adding the four types of metallocene polyethylene into a second cavity of the jig, and converging the three types of melts in a discharge cavity of the jig to form a preformed clip chain attached with the four types of metallocene polyethylene at one side of the bone strip leaves;

step S4: drawing the preformed clip chain formed in the step S3 into a cooling device through a drawing device for cooling to form a semi-finished clip chain;

step S5: placing the semi-finished product clip chain obtained in the step S4 in a space with a set temperature for a set time to form a finished product clip chain;

step S6: and (5) using a chain combining machine to combine the chains to form the finished sealing strip.

2. The process for producing the slider type sealing bag sealing strip according to claim 1, wherein the melt index of the nonlinear low density polyethylene is in the range of 2 to 5g/10 min; the melt index range of the linear low-density polyethylene is 0.5-2.5g/10 min; the melt index range of the metallocene polyethylene is 0.2-1.2g/10 min; the melt index range of the second metallocene polyethylene is 3-5g/10 min; the melt index range of the high-density polyethylene is 0.5-1g/10 min; the melt index range of the three types of metallocene polyethylene is 0.2-5g/10 min; the melt index range of the four types of metallocene polyethylene is 0.5-2.5g/10 min.

3. The process for producing the slider type sealing bag sealing strip according to claim 2, wherein the density of the metallocene polyethylene is in the range of 0.93-0.95g/m³(ii) a The density of the second metallocene polyethylene is 0.93-0.95g/m³(ii) a The density of the three types of metallocene polyethylene ranges from 0.85 to 0.95g/m³(ii) a The density of the four types of metallocene polyethylene ranges from 0.91 to 0.92g/m³。

4. The production process of the slider type sealing bag sealing strip according to claim 3, wherein the first mixture comprises the following components in parts by weight: non-linear low density polyethylene: 35% -42%, linear low density polyethylene: 10% -15%, a metallocene polyethylene: 5% -9%, metallocene polyethylene of two types: 20% -30%, high density polyethylene: 10% -15%;

the second mixture comprises the following components in parts by weight: non-linear low density polyethylene: 40% -60%, linear low density polyethylene: 10% -20%, three types of metallocene polyethylene: 30 to 40 percent.

5. The production process of the slider type sealing bag sealing strip according to claim 4, wherein the first mixture comprises the following components in parts by weight: non-linear low density polyethylene: 39% -41%, linear low density polyethylene: 13% -14%, a metallocene polyethylene: 6% -7%, metallocene polyethylene of two types: 26% -27%, high density polyethylene: 13% -14%;

the second mixture comprises the following components in parts by weight: non-linear low density polyethylene: 49% -51%, linear low density polyethylene: 16% -17%, three types of metallocene polyethylene: 33 to 34 percent.

6. The production process of the slider type sealing bag sealing strip according to claim 1, wherein the cooling device used in step S4 is a constant temperature water tank, the pre-forming clip chain is pulled into the constant temperature water tank by a pulling device for cooling, the temperature of cooling water in the constant temperature water tank is 26-30 ℃,

obtaining chain clamps with different sizes by controlling the traction speed of the traction equipment, the extrusion speed of the extrusion equipment and the liquid level height of cooling water in the constant-temperature water tank;

in step S6, when the zipper is closed by the zipper closing machine, the side of the four types of metallocene polyethylene provided on the framework leaves of the two types of zipper is respectively directed to the outer side of the sealing strip.

7. The utility model provides a tool of slider formula sealing bag sealing strip, its characterized in that, it is platelike structure, and it has first side and second side, the tool has seted up two sets of cavitys that run through respectively along its thickness direction first side and second side, all including one in each group's die cavity have the first die cavity of setting for the shape and one have the second die cavity of setting for the shape, first die cavity and second die cavity run through respectively first side, first die cavity and second die cavity are in the tool in-connection forms a unloading chamber, the unloading chamber runs through the second side of tool.

8. The jig for the slider type sealing bag sealing strips as claimed in claim 7, wherein the first cavity comprises a bone strip cavity and a bone strip leaf cavity, the bone strip leaf cavity is communicated with the bone strip cavity, the second cavity is located at one side of the bone strip leaf cavity, and the second cavity is communicated with the bone strip leaf cavity.

9. The extrusion equipment of the slider type sealing bag sealing strip is characterized by comprising a die head, a first extrusion unit, a second extrusion unit and a third extrusion unit which are respectively communicated with the die head, wherein each extrusion unit comprises an extrusion device, the extrusion device comprises a material barrel and a screw rod arranged in the material barrel, a feeding hole and a discharging hole are formed in the material barrel, the screw rod can heat materials in the material barrel, and the screw rod can be driven to rotate in the material barrel so as to extrude the materials in the material barrel into the die head from the discharging hole;

10. the extrusion device of the slider type sealing bag sealing strip according to claim 9, wherein the die head is provided with two sets of discharging cavities respectively, the discharging cavities are communicated with the outside of the die head respectively, each set of discharging cavities comprises a first discharging cavity, a second discharging cavity and a third discharging cavity, the first extrusion unit is communicated with the first discharging cavity, the second extrusion unit is communicated with the second discharging cavity, and the third extrusion unit is communicated with the third discharging cavity,

when the jig is installed on the die head, a bone cavity on the jig is communicated with the first discharging cavity, a bone blade cavity on the jig is communicated with the second discharging cavity, and a second cavity on the jig is communicated with the third discharging cavity;

each extrusion unit also comprises at least one heating device, and a discharge hole of the extrusion device is communicated with a discharge cavity in the die head through the heating device.