JPH03199414A - Heat-fusion yarn and heat-fusion composite yarn - Google Patents

Abstract

PURPOSE: To obtain a thermally fused fiber capable of giving an excellent anti- fraying property to gloves, etc. by mixing polyethylene with isotactic polypropylene in a specific ratio, melting the mixture, extruding the melted mixture in the form of a fiber, and simultaneously cooling the fiber. CONSTITUTION: This thermally fused fiber is obtained by mixing polyethylene with isotactic polypropylene in such a ratio that the polyethylene occupies 50-95% of the total amount of the mixture, melting the mixture, extruding the melted mixture in the form of a fiber, and simultaneously cooling the fiber. The thermally fused composite yarn is obtained by combining a polyurethane fiber elongated by the application of a tensile force with an acrylic yarn to form a core yarn and then winding the above thermally fused fiber and another acrylic yarn on the core yarn in mutually opposed directions. The obtained thermally fused composite yarn is fused to give an excellent anti-fraying property to the ends of gloves and the like.

Description

Detailed Description of the Invention A. Field of Industrial Application The present invention relates to a heat-fusible yarn used to prevent fraying of the edges of textile products, especially the edges of the wrist portion of gloves such as work gloves, and This invention relates to a heat-fused composite yarn using a fusible yarn.

B) Conventional techniques For edge treatment of textile products including gloves such as work gloves, instead of overlock stitching, for example, Japanese Patent Publication No. 61-17938
As described in the above publication, there is a technique in which the edge portion is knitted with a heat-fusible composite yarn in which a heat-fusible yarn is wound around a core yarn, and the heat-fusible yarn is fused by heating to prevent fraying. Conventionally, the method for preventing fraying has been to use threads made by twisting polyester threads and staple threads as core threads, and as heat-fusible threads, such as Erg series (registered trademark) manufactured by Toshi Co., Ltd. and Mobilon (registered trademark) manufactured by Nisshinbo Co., Ltd. (registered trademark) was used.

C1 Problems to be Solved by the Invention Polyester yarn has a good feel, and it is not preferable to twist it together in a loose yarn manner. However, conventionally used heat-fusible yarns harden after being heated and cooled, so the amount used must be limited in order to improve the feel after treatment, which impairs the fusibility. Therefore, in order to compensate for the lack of fusibility of the heat-fusible yarn, a core yarn made by twisting a polyester yarn with a staple yarn must be used, so the usability is similar to overlock stitching.

On the other hand, polyethylene thread is a fiber that is sufficiently soft even when heated and cooled, but it lacks strength and is not suitable for thin threads for textiles.

2. Means for solving the problem The present invention is based on the fact that isotactic polypropylene yarn, which has high strength but hardens after heating and cooling, and polyethylene yarn, which has the opposite properties, are not used for textiles. Focusing on the molecular structures of both polyethylene and isotactic polypropylene, we developed applications for them as raw materials for textiles, as well as heat-fusible threads and heat-fusible composites that enable edge treatment of textile products superior to overlock stitching. The purpose is to provide a thread, and its composition is a heat-sealable thread made by mixing and melting polyethylene and isotactic polypropylene at a ratio of 50 to 95% of the total amount of polyethylene, and cooling the mixture while drawing it out into a thread. , and a polyurethane thread that has been stretched by applying a tensile force and is attached with an acrylic thread to form a core thread, and other acrylic threads are wound around the core thread in two directions, and the heat-sealable thread is wound in the S direction. In fused composite yarn.

E1 Effect Polyethylene and isotactic polypropylene do not undergo chemical changes even when mixed and melted, and the fibers drawn out in the form of threads from the mixed melt remain soft even when cooled after heating and melting, which is ideal for textiles. It is a heat-sealable thread that combines the properties of polyethylene and the properties of isotactic polypropylene, which has excellent strength and does not have to worry about breaking even when used as a thin thread for textiles. Furthermore, the heat-fusible composite yarn is made by winding the heat-fusible yarn and the acrylic yarn around the core yarn, which is made by attaching an acrylic yarn to a polyurethane yarn that has been stretched by applying a tensile force, and the tensile force is released. As a result, the acrylic thread becomes slack and swells around the polyurethane thread in a molded shape, and becomes intricately intertwined.

Embodiment An embodiment of the present invention will be described below based on the drawings.

First, to explain the heat-sealing yarn, as shown in the first diagram,
The same amount of polyethylene 1 and isotactic polypropylene 2 are charged into the hopper 3, and the screw conveyor 4
A general melt spinning method is used in which the fibers are extruded from the nozzle 5 while being mixed and melted at 00°C to 320°C, and the undrawn fibers 6 are produced by cooling while being drawn out from the nozzle 5, and then hot drawn and rolled up into thinner fibers. The heat-sealable thread A is formed into a thread.

The mixing ratio of polyethylene 1 and isotactic polypropylene 2 should be such that the amount of polyethylene 1 is 50% or more of the total, and the amount of isotactic polypropylene 2 is 5% or more of the total, and the amount of polyethylene 1 is 95 to 50% of the total. %, the amount of intact polybrobylene 2 can be changed as appropriate within the range of 5 to 50%. Further, the apparatus used in the melt spinning method is not limited to the above embodiment.

Next, to explain the heat-fused composite yarn B, first, as shown in FIG. The polyurethane thread 7 is placed on top of the cone 9a with the centers parallel to each other so as to be transferable, and the acrylic thread 9 of the cone 9a around which the acrylic thread 9 is wound is pulled out along the polyurethane thread 7. . In the thread pull-out path, a cheese 10 wrapped around the heat-sealable thread A with both threads 7.9 passed through the through-hole at the center of the thread winding, and a cheese 11a wrapped around an acrylic thread 11 are placed on the upper and lower sides, respectively. The polyurethane threads 7 and the acrylic threads 9 are pulled upward from each cheese 10, lla together with the polyurethane threads 7 and the acrylic threads 9. The threads of the trowel are wound together while being sandwiched between a pair of winding rollers 12, 12, and wound onto a core tube.

The winding roller 12 is adjusted to rotate 3.5 times while the feed roller 8 rotates once, so that the polyurethane thread 7 is stretched to 3.5 times the length and sent out. Also, the cheese 10 is 2
The cheese 11a rotates in the S direction, and the heat-sealing yarn A and the acrylic yarn 11 are wound around the core yarns of the polyurethane yarn 7 and the acrylic yarn 9 in opposite directions.

As a result, the heat-fused composite yarn changes from the stretched state shown in FIG. 3a to the state shown in FIG. Due to the shrinkage, the acrylic threads constituting the core threads curl and swell into a malleable shape, becoming intricately intertwined.

Note that the polyurethane yarn constituting the core yarn is stretched to a length of 2.5 to 3.5 times its normal length, so that the resulting heat-sealable composite yarn is in the best condition.

In addition, the usage ratio of each yarn is 8% polyurethane yarn that makes up the core yarn, 60% in total for the acrylic yarn that becomes the core yarn and the acrylic yarn that is wrapped around the core yarn, and 32% for the heat-fusible yarn.
However, these ratios can be changed as appropriate.

In addition, when the edges of fibers such as gloves are knitted using this heat-fused composite yarn and heat treated at 110°C to 180°C, the melting point of polyethylene is 110°C to 130°C.
Since the melting point of isotactic polypropylene is about 170°C, the heat-fusible thread melts and fuses to the surface of the acrylic thread constituting the core thread and the acrylic thread wound around the core thread. On the other hand, since the melting point of acrylic is higher than that of polyethylene and isotactic polypropylene, heating at the above temperature does not change the melting point of acrylic.

Effects of the Invention According to the present invention, a way has been opened to utilize polyethylene and isotactic polypropylene for textiles, and in addition, the heat-fusible yarn of the present invention retains the softness and feel of polyethylene even after heat treatment. It has both the good properties of polypropylene and the strength of intact polypropylene, so when it is used in heat-sealed composite yarns, it is used in large quantities to tightly fuse the yarns together to prevent fraying. It also never hardens.

As a result, the amount of acrylic used can be increased and the softness of the acrylic yarn can be fully utilized because it does not contain staple fibers. Furthermore, a core thread is formed from a polyurethane thread stretched by applying a tensile force and an acrylic thread attached thereto, and the heat-sealable thread and another acrylic thread are wound around the core thread in opposite directions. The heat-fused composite yarn of the invention not only does not lose the soft feel of acrylic yarn, but also has an even softer feel because the acrylic yarn that makes up the core yarn forms a loop around the polyurethane yarn. The edges are tightly fused to prevent fraying of the edges.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a melt spinning apparatus, Fig. 2 is an explanatory diagram showing a heating mechanism for producing the heat-sealable composite yarn of the present invention, and Fig. 3a is an illustration of the structure of the heat-sealable yarn of the present invention. FIG. 3 is an explanatory diagram showing a state in which polyurethane is stretched, and FIG. 3 is an explanatory diagram showing a state in which the polyurethane is stretched and the heat-sealing yarn structure is removed. l...Polyethylene, 2...Isotactic polypropylene, 3...Hopper, 4...Screw conveyor, 5
...Nozzle, 6..Undrawn fiber, 7..Polyurethane thread, 8..Feeding roller, 9..Acrylic thread, 9a..
Corn, 10...cheese, 11...acrylic thread, lla
...Cheese, 12.. Winding roller, A.. Heat fusion yarn, B.. Heat fusion composite yarn,

Claims (2)

[Claims] (1) A heat-sealable thread made by mixing and melting polyethylene and isotactic polypropylene in a proportion where the amount of polyethylene is 50 to 95% of the total, and cooling the mixture while drawing it out into a thread. (2) An acrylic thread is attached to a polyurethane thread stretched by applying a tensile force to form a core thread, and other acrylic threads are attached around the core thread in the Z direction, and the heat treatment according to claim 1 is applied. A heat-fused composite yarn made by winding each fused yarn in the S direction.