KR101096112B1 - preparation method of loop tape for hook-loop fastening system and loop tape formed therefrom - Google Patents

Abstract

The present invention relates to a method of manufacturing a loop tape constituting a hook-loop fastening system called velcro, wherein (S1) a paper structure composed of a first fiber comprising a first thermoplastic polymer having a predetermined melting point, and Preparing a loop structure comprising a plurality of loops formed of a second fiber made of a second polymer having a melting point higher than the melting point of the first thermoplastic polymer or having a high decomposition temperature and fixed to the paper tissue; (S2) laminating the loop structure on a nonwoven fabric made of a third fiber including a third thermoplastic polymer having a melting point lower than the melting point or decomposition temperature of the second polymer; And (S3) compressing the resultant of (S2) and applying heat to a temperature higher than the melting point of the first thermoplastic polymer and the third thermoplastic polymer and lower than the melting point or decomposition temperature of the second polymer, thereby allowing the paper tissue and the nonwoven fabric to cross each other. Heat fusion step. According to the production method of the present invention, it is possible to obtain a loop tape having good bonding strength such as peel strength and excellent breathability.

Description

Preparation method of loop tape for hook-loop fastening system and loop tape formed therefrom}

The present invention relates to a fastening system for dairy products, such as diapers, gloves and gowns, and more particularly, as referred hook Velcro (velcro) - relates to a loop tape from the production process and which the loop tape from the loop fastening system are formed .

As a fastening system for household goods such as diapers, sanitary napkins, gloves, gowns and the like, frontal tapes using adhesive films have been used. However, in the case of the frontal tape, an odor occurs due to the adhesive component, and a problem such as a significant decrease in the adhesive strength during repeated use occurs. Accordingly, a hook-loop fastening system (also referred to as Velcro) has been applied, which consists of hook and loop tapes that can be releasably engaged with one another.

For example, Korean Patent Laid-Open Publication No. 2007-32352 discloses a loop tape in which a loop structure is bonded to a film as a loop tape bound with a hook tape. However, when the loop tape is manufactured by bonding the loop tissue to the film, the bonding strength is excellent, but there is a drawback of causing sweat and discomfort because it is not breathable. In order to solve this problem, a loop tape using a long fiber nonwoven fabric has been proposed, but has a disadvantage in that the bonding strength is poor. Therefore, the research on the breathable loop tape firmly bound to the loop structure without impairing the function of the nonwoven fabric having excellent breathability continues.

Accordingly, an object of the present invention is to solve the above problems, and to provide a loop tape manufacturing method of a hook-loop fastening system having good bonding strength such as peel strength and excellent breathability, and a loop tape formed therefrom.

Method for producing a loop tape constituting the hook-loop fastening system of the present invention to achieve the above object,

(S1) consisting of a branched structure consisting of a first fiber comprising a first thermoplastic polymer having a predetermined melting point and a second fiber of a second polymer having a melting point higher than the melting point of the first thermoplastic polymer or having a high decomposition temperature; Preparing a loop tissue including a plurality of loops fixed to the branch tissue;

(S2) laminating the loop structure on a nonwoven fabric made of a third fiber including a third thermoplastic polymer having a melting point lower than the melting point or decomposition temperature of the second polymer; And

(S3) compressing the resultant of (S2) and applying heat to a temperature higher than the melting point of the first thermoplastic polymer and the third thermoplastic polymer and lower than the melting point or decomposition temperature of the second polymer to heat the paper tissue and the nonwoven fabric. Fusion step.

In the manufacturing method of the present invention, the melting point or decomposition temperature of the second polymer is preferably at least 20 degrees higher than the melting point of the first thermoplastic polymer and the third thermoplastic polymer, the first thermoplastic polymer and the third thermoplastic polymer It is preferable that the melting point difference of is 20 degrees or less.

In the manufacturing method of the present invention, it is preferable that the third fiber uses a composite spun fiber of a polymer having a higher melting point than the third thermoplastic polymer and the third thermoplastic polymer.

Loop tape of the present invention formed according to the above-described manufacturing method,

(a) a branched structure consisting of a first fiber comprising a first thermoplastic polymer having a predetermined melting point and a second fiber of a second polymer having a melting point higher than the melting point of the first thermoplastic polymer or having a high decomposition temperature; A loop tissue comprising a plurality of loops fixed to the branch tissue; And

(b) a nonwoven fabric made of a third fiber comprising a third thermoplastic polymer laminated on the lower surface of the loop structure and having a melting point lower than the melting point or decomposition temperature of the second polymer,

The paper tissue and the nonwoven fabric are thermally bonded to each other by melting the first fiber and the third fiber.

 According to the manufacturing method of the present invention, the loop structure including loops that can be releasably coupled with the hook has good joint strength because the underlying tissue is firmly fixed by thermally fusion with the nonwoven fabric. At this time, since many loops are not affected by heat treatment, their shape is maintained as it is, and the breathability of the loop tape is maintained well due to the characteristics of the nonwoven fabric.

Hereinafter, the present invention will be described in detail. The terms or words used in this specification and claims are not to be construed as limiting in their usual or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

The present invention relates to a method of manufacturing a loop tape in a hook-loop fastening system, wherein the melting point is higher than the melting point of the first structure and the branching structure of the first fiber comprising the first thermoplastic polymer having a predetermined melting point or Prepare a loop structure consisting of a second fiber of a second polymer having a high decomposition temperature and comprising a plurality of loops fixed to the paper tissue (step S1).

As shown in FIG. 1, a loop tissue 10 including a branch tissue 1 and a plurality of loops 3 formed to be fixed to the branch tissue 1 is prepared. This type of loop structure 10 can be manufactured using a conventional knitting machine or the like, which is well known in the art as a loop knit structure, and is used as a component of a loop tape of a hook-loop fastening system. Detailed manufacturing method is omitted.

In the manufacturing method of this invention, the 1st fiber which comprises the branch structure 1 contains the 1st thermoplastic polymer which has a predetermined melting | fusing point. In addition, the loops 3 are formed of a second polymer having a higher melting point or higher decomposition temperature than the melting point of the first thermoplastic polymer. In the present invention, when the thermoplastic polymer is used as the second polymer, the thermal characteristics of the second polymer with respect to the other thermoplastic polymer are compared by melting point, but when the thermosetting polymer is used as the second polymer, the second polymer with respect to the other thermoplastic polymer is used. The thermal properties of are compared by their decomposition temperature instead of their melting point. Accordingly, through heat treatment at an appropriate temperature, the second polymer can selectively melt only the first fiber made of the first thermoplastic polymer without being melted or pyrolyzed and damaged. In other words, only the paper tissue 1 can be melted without affecting the shape of the loop 3. In this aspect, the melting point of the second polymer (decomposition temperature when the second polymer is thermosetting) is preferably at least 20 degrees higher than the melting point of the first thermoplastic polymer.

On the other hand, the first fiber constituting the branch structure (1) may be formed of only the first thermoplastic polymer, but the composite spun fiber spun composite polymer of the first thermoplastic polymer and a polymer having a higher melting point than the first thermoplastic polymer ( Polyethylene / polypropylene, polyethylene terephthalate / polyethylene terephthalate copolymer, etc.) may be used. As the composite spun fiber, the inner and outer composite spun fiber or the side by side composite spun fiber in which the first thermoplastic polymer constitutes the outer surface can be used.

 Subsequently, the above-described loop structure is laminated on a nonwoven fabric made of a third fiber comprising a third thermoplastic polymer having a melting point lower than the melting point or decomposition temperature of the second polymer. The local tissue of the loop tissue is brought into contact with the nonwoven fabric (step S2).

As well-known nonwoven fabrics, as well as a spunbond nonwoven fabric, a melt blown nonwoven fabric, and an air-laid nonwoven fabric, a high fiber cohesion, as well as a web form formed by carding short fibers, has a weak cohesion. If necessary, the binding force can be increased by needle punching or the like. The nonwoven fabric may be composed of, for example, a fiber having a fineness of 1 to 15 denier to have a weight of 15 to 100 g / m 2, but is not limited thereto.

The third fiber constituting the nonwoven fabric includes a thermoplastic polymer having a melting point lower than the melting point (or decomposition temperature) of the second polymer forming the loop. Accordingly, through heat treatment at an appropriate temperature, the second polymer can selectively melt only the third fiber made of the third thermoplastic polymer without being melted or pyrolyzed and damaged. That is, only the nonwoven fabric can be melted without affecting the shape of the loop. In this aspect, the melting point of the second polymer (decomposition temperature when the second polymer is thermosetting) is preferably at least 20 degrees higher than the melting point of the third thermoplastic polymer.

On the other hand, the third fiber constituting the nonwoven fabric may be formed of only the third thermoplastic polymer, but composite spinning (polyethylene / polypropylene, composite spinning of the third thermoplastic polymer and a polymer having a higher melting point than the third thermoplastic polymer) Polyethylene terephthalate / polyethylene terephthalate copolymer) fibers may be used. As the composite spun fiber, the inner and outer composite spun fiber or the side by side composite spun fiber in which the third thermoplastic polymer constitutes the outer surface can be used.

Then, the resultant of the step (S2) is pressed and heat is applied to a temperature higher than the melting point of the first thermoplastic polymer and the third thermoplastic polymer and lower than the melting point or decomposition temperature of the second polymer, so that the paper tissue and the nonwoven fabric are mutually Heat fusion. Accordingly, the structure of the loop and the nonwoven fabric are fixed to each other while maintaining the shape of the loop. In this aspect, the melting point or decomposition temperature of the second polymer is preferably at least 20 degrees higher than that of the first thermoplastic polymer and the third thermoplastic polymer, and the difference between the melting point of the first thermoplastic polymer and the third thermoplastic polymer is 20 degrees. It is preferable that it is the following. As a combination of such polymers, polyethylene terephthalate, nylon, acryl, acetate, etc. may be used as the second polymer, and polyethylene, polypropylene, low-melting polyester copolymer, etc. may be used as the first thermoplastic polymer and the third thermoplastic polymer. have.

When the first fiber and / or the third fiber is a composite spun fiber, the heat treatment temperature may be treated to a temperature at which the whole of the spun spun fiber can be melted, but only the low melting point component of the composite spun fiber can be selectively melted. It can also be heat treated to temperature.

At this time, the heat treatment is preferably achieved by passing the resultant (S2) through a heated calender roll, which can be entangled with fibers in the nonwoven fabric (especially in the form of a web) by applying hot air before inputting the calender roll, if necessary. Of course, in addition to the calender roll, other methods capable of thermal fusion, such as ultrasonic, can also be used.

Loop tapes produced according to the method described above,

(a) a branched structure consisting of a first fiber comprising a first thermoplastic polymer having a predetermined melting point and a second fiber of a second polymer having a melting point higher than the melting point of the first thermoplastic polymer or having a high decomposition temperature; A loop tissue comprising a plurality of loops fixed to the branch tissue; And

(b) a nonwoven fabric made of a third fiber comprising a third thermoplastic polymer laminated on the lower surface of the loop structure and having a melting point lower than the melting point or decomposition temperature of the second polymer,

The paper tissue and the nonwoven fabric are thermally bonded to each other by melting the first fiber and the third fiber.

The loop tape of the above-described structure can be usefully used as a fastening system for household goods such as diapers, gloves, gowns, etc. together with the hooks.

Hereinafter, examples will be described in detail to help understand the present invention. However, embodiments according to the present invention can be modified in many different forms, the scope of the invention should not be construed as limited to the following examples. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.

Example 1

A loop knit structure was prepared having a branch structure composed of 75 d / 36f polyethylene terephthalate fibers and formed using polypropylene 75d / 72f as the warp and polypropylene DTY 75d / 36f as the weft.

In addition, a web-like nonwoven fabric prepared by feeding a composite spun fiber composed of two components of polypropylene / polyethylene into a carding machine was prepared.

While the nonwoven fabric prepared as shown in FIG. 2 is transferred to a conveyor belt, it is laminated on the nonwoven fabric so that the paper tissue goes down, and then passed through a calender roll heated to a temperature of 170 degrees Celsius, which is higher than the melting point of polypropylene. The tissues were thermally fused together.

Example 2

The same procedure as in Example 1 was conducted except that polypropylene DTY 150d / 48f was used instead of polypropylene DTY 75d / 36f as the weft thread.

Example 3

Except for using a laminate of spunbonded nonwoven fabrics and meltblown nonwoven fabrics formed by spinning the composite spun fiber composed of two components of polypropylene / polyethylene instead of the web nonwoven fabric formed by feeding the composite fiber into the carding machine. It carried out by the same method as Example 1.

Comparative Example 1

Polyurethane bonding the OPP film to the loop knit tissue prepared by using polyethylene terephthalate instead of polypropylene as the weft part and the inclined part constituting the paper tissue was composited in a gravure method.

180 ° peeling strength, shear strength and air permeability were measured for the loop tapes of the examples and the comparative examples prepared by the above-described method, and the results are shown in Table 1 below.

180 ° Peel Strength Measurement—The 180 degree peel strength test measured the force required to separate the hook and loop at an angle of 180 degrees after fastening the hook and loop tapes of the examples and comparative examples. Loop tapes of length 40mm and width 50mm and hooks of length 25mm and width 24mm were prepared and fastened to each other. Then, using a roll having a load of 2Kg was pressed back and forth between the coupling surface of the hook and loop. After 10 seconds had elapsed, one end of the hook and one end of the loop were bitten by the joint of the tensile tester and tensioned at a speed of 300 mm per minute to measure the peel force between the hook and the loop.

Shear strength measurement-Samples were prepared in the same manner as the peel strength test, and the opposite ends of the hook and loop were bitten by the joints of the tensile tester, and the shear force between the hook and the loop was measured by pulling at a speed of 300 mm per minute.

Air permeability measurement-Air permeability was measured using FX-3300 air permeability tester of TEXTEST of Switzerland according to the method of KS K 0570.

180 ° peel strength
(g) shear strength
(Kg) Air permeability
(Cm 3 / cm 2 / sec) Example 1 352 3.3 120 Example 2 365 3.6 115 Example 3 346 3.3 86 Comparative Example 1 328 3.1 0

 The following drawings, which are attached to this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention, serve to facilitate understanding of the technical spirit of the present invention. It should not be construed as limited to matters.

1 is a schematic plan view of a loop structure used in the loop tape of the present invention.

2 is a schematic diagram illustrating a process of manufacturing a loop tape according to an embodiment of the present invention.

Claims (6)

(S1) consisting of a branched structure consisting of a first fiber comprising a first thermoplastic polymer having a predetermined melting point and a second fiber of a second polymer having a melting point higher than the melting point of the first thermoplastic polymer or having a high decomposition temperature; Preparing a loop tissue including a plurality of loops fixed to the branch tissue; (S2) laminating the loop structure on a nonwoven fabric made of a third fiber including a third thermoplastic polymer having a melting point lower than the melting point or decomposition temperature of the second polymer so that the branched tissue of the loop structure is in contact with the nonwoven fabric ; And (S3) compressing the resultant of (S2) and applying heat to a temperature higher than the melting point of the first thermoplastic polymer and the third thermoplastic polymer and lower than the melting point or decomposition temperature of the second polymer to heat the paper tissue and the nonwoven fabric. A method of making a loop tape of a hook-loop fastening system comprising fusing. The method of claim 1, wherein the melting point or decomposition temperature of the second polymer is at least 20 degrees higher than the melting point of the first thermoplastic polymer and the third thermoplastic polymer. The method of claim 2, wherein the melting point difference between the first thermoplastic polymer and the third thermoplastic polymer is 20 degrees or less. The method of claim 1, wherein the third fiber is a composite spinning fiber of the third thermoplastic polymer and a polymer having a higher melting point than the third thermoplastic polymer. The loop tape of a hook-loop fastening system according to claim 1, wherein the first thermoplastic polymer is polypropylene, the second polymer is polyethylene terephthalate, and the third thermoplastic polymer is polyethylene or polypropylene. Manufacturing method. (a) a branched structure consisting of a first fiber comprising a first thermoplastic polymer having a predetermined melting point and a second fiber of a second polymer having a melting point higher than the melting point of the first thermoplastic polymer or having a high decomposition temperature; A loop tissue comprising a plurality of loops fixed to the branch tissue; And (b) a nonwoven fabric made of a third fiber comprising a third thermoplastic polymer laminated on the lower surface of the loop structure and having a melting point lower than the melting point or decomposition temperature of the second polymer, The branched fabric and the nonwoven fabric are thermally bonded to each other by melting the first fiber and the third fiber at a temperature higher than the melting point of the first thermoplastic polymer and the third thermoplastic polymer and lower than the melting point or decomposition temperature of the second polymer. Loop tape of hook-loop fastening system.

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