JP3154561B2 - Core-sheath type composite fiber for sports apparel with anti-friction performance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for fabricating a knitted fabric or a knitted fabric mainly made of synthetic fibers, which may be damaged by frictional heat when the fabric or knitted fabric hits a floor of a gymnasium or the like where wood is used. The present invention relates to a core-in-sheath type conjugate fiber for sports clothing having a friction-melting performance that solves the problem.

[0002]

2. Description of the Related Art Cloths made of synthetic fibers such as polyester and nylon and used as sports clothing slide on the floor surface and, when excessive friction is generated, is melted by the frictional heat generated to form holes. Therefore, various types of friction melting processing have been performed.

[0003] Surface treatments such as enhancing the smoothness of the cloth by applying a finishing agent containing silicone as a main component have been performed. Such a special processing method has good friction-melting resistance, but snagging or the like is required. In addition, the physical properties of the fabric deteriorate, and the performance deterioration due to washing is inevitable.

There is also a method of reinforcing synthetic fibers from heat by mixing and knitting with cotton, mixing and weaving, or forming a composite yarn with cotton (simple twisting, spinning and twisting, etc.). However, in this case, the synthetic fiber in the surface layer must be melted due to friction, and there are also problems such as the color resistance of cotton and the high cost based on processing labor.

[0005] Therefore, instead of imparting functions by post-processing as described above, the yarn itself expresses its performance,
A core-sheath type composite spun fiber using a polymer having a lower melting point than the polymer of the sheath component as the core component has been proposed in Japanese Patent Application Laid-Open No. Hei 4-11006. That is, this fiber is a composite spun fiber in which polyethylene terephthalate is provided as a sheath component and polypropylene or nylon 12 is provided as a core component.

[0006]

In order to further improve the friction-melting resistance, plasticized low-melting nylon 12 or nylon 6/12 copolymer having a lower melting point than nylon 12 is used as the core component polymer. It was found that the friction-melting resistance was not very high. The present invention is an improvement over the conventional technique disclosed in Japanese Patent Application Laid-Open No. 4-110006, and further increases the friction melting resistance,
It is an object of the present invention to provide a fiber which hardly shows a melting trace even when subjected to contact pressure friction.

[0007]

The gist of the present invention is that the core component polymer has a lower melting point and a heat of fusion than the sheath component.
A polymer having more than 0 J / g, a rotor-type friction
Contact pressure friction for 3 seconds at a load of 6 kg by abrasion melting test
Characterized by almost no trace of melting when
It is a core-sheath type composite fiber for sports clothing having friction melting performance .

[0008] Conventionally, polyethylene terephthalate is disposed on the sheath and polypropylene or nylon 1 is disposed on the core.
It has been known that the core-sheath type composite spun fiber provided with No. 2 exhibits good friction-melting resistance.

However, plasticized low melting point nylon 12 having a lower melting point (melting point = 171.5 ° C., heat of fusion = 4)
7.6 J / g) or a nylon 6/12 copolymer (melting point = 147.1 ° C., heat of fusion = 43.4 J / g) as a core component polymer has a friction-melting resistance. By using a polymer having a low melting point and a heat of fusion of 90 J / g or more as a core component polymer, the fiber for sports clothing which is excellent in friction-melting resistance aimed at by the present invention is obtained.

The sheath component polymer of the present invention is polyethylene terephthalate (melting point = 256 ° C., heat of fusion = 41 J /
g), nylon 66 (melting point = 265 ° C., heat of fusion = 67)
J / g) and nylon 6 (melting point = 224 ° C., heat of fusion = 67 J / g), and a polyester polymer whose main repeating unit is composed of a repeating unit of polyethylene terephthalate is preferably used.
On the other hand, a high-density polyethylene (melting point = 130 ° C., heat of fusion = 135 J / g) having a lower melting point than the sheath component polymer and having a heat of fusion of 90 J / g or more as the core component polymer.
g) can be used. Low-density polyethylene (melting point 114 ° C, heat of fusion 77 J / g), polypropylene (melting point = 168 ° C, heat of fusion = 81 J / g) as core components
Or nylon 12 (melting point = 182 ° C., heat of fusion = 5
When 5 J / g) or the like is used, the friction-melting resistance is exhibited to some extent, but the fiber for sports clothing which hardly shows a melting mark even when subjected to contact pressure friction, which is the object of the present invention, is not obtained.

[0011] The fiber produced in this manner shows almost no trace of melting even when subjected to contact pressure friction for 3 seconds under a load of 6 kg by a rotor type friction melting test.

It is not clear why the conjugate fiber of the present invention exhibits excellent friction-melting resistance, but the heat generated by friction causes the core to rise to near its melting point and melt. It is considered that the temperature rise of the sheath portion is suppressed by the melting endothermic effect generated at this time, and nylon 12 having a large heat of fusion is more preferable than having plasticized nylon 12 or a copolymer having a small heat of fusion as a core component. It can be fully understood that the performance is exhibited more.

[0013] Further, from this, a polymer having a lower melting point and a larger heat of fusion (90 J / g or more) than that of the sheath component polymer is effective as a core component polymer as a method for increasing the performance manifestation. Polyethylene has a larger heat of fusion than polypropylene or nylon 12, and has greater performance.

[0014]

EXAMPLES The present invention will be described in more detail with reference to the following examples. The friction melting test in the examples is based on JIS L105.
6B method (a method using a rotor-type friction melting tester). [Example 1] Relative viscosity 1.6, density 1.38 g / c
m ³ , a polyethylene terephthalate polymer (PET) having a melting point of 256 ° C. and a MI (melt flow index) of 20 g / 10 min, a density of 0.96 g / cm ³ ,
Using a high-density polyethylene polymer (PE) having a melting point of 130 ° C. and a heat of fusion of 135 J / g for the core, a composite-spinning is performed at 290 ° C. with a core-sheath composite ratio (volume ratio): high-density PE / PET = 1/4, 234.2d undrawn yarn was obtained. Next, it was stretched by a known two-stage stretching machine to obtain an 87.6d / 24f raw yarn, and the stability was good. Next, false twisting with a two-stage heater was performed using the obtained yarn. The heater temperature at this time is 1 lower than that of 100% polyester yarn.
Although 40 ° C. was employed, the false twisting process was stable without yarn breakage. Using this false twisted yarn, a 20G circular knitting machine was knitted with a mock rody, which is a typical structure when used for sports clothing, and dyed in the usual dyeing process employed when polyester fibers were used. Good fabrics such as color clarity and texture were obtained. When a rotor-type friction melting test (load: 6 kg, 3 seconds) was performed on the obtained dough, almost no melting trace was recognized, and no perforation phenomenon was observed.

Comparative Example 1 As a core component in Example 1, MI was 45 g / 10 min and density was 0.92 g / cm.
^{3. Using} a polypropylene polymer (PP) having a melting point of 170 ° C. and a heat of fusion of 81 J / g for the core, a composite spinning at 290 ° C. with a core-sheath composite ratio (volume ratio): PP / PET = 1/4, 236. 0d undrawn yarn was obtained. After that, stretching was performed in the same manner, and a 90.4 d / 24f raw yarn was obtained, and the stability was good. Next, false twisting was performed at a heater temperature of 150 ° C. using the obtained raw yarn. Thereafter, knitting and dyeing were carried out in the same manner, and a friction test (load: 6 kg, 3 seconds) was carried out. As a result, no thread breakage occurred even when pulled, and a perforation phenomenon was not observed, but melting marks were observed.

Comparative Example 2 Nylon 12 (N12) having a density of 1.02 g / cm ³ , a melting point of 182 ° C., and a heat of fusion of 55 J / g was used as a core component in Example 1, and a core-sheath composite ratio ( (Volume ratio): Composite spinning was performed at 290 ° C. with N12 / PET = 1/4 to obtain an undrawn yarn of 236.0 d. After that, stretching was performed in the same manner, and a 90.4 d / 24f raw yarn was obtained, and the stability was good. Next, false twisting was performed at a heater temperature of 150 ° C. using the obtained raw yarn. Thereafter, knitting and dyeing were carried out in the same manner, and a friction test (load: 6 kg, 3 seconds) was carried out. As a result, no thread breakage occurred even when pulled, and a perforation phenomenon was not observed, but melting marks were observed.

Comparative Example 3 Plastic core low melting point nylon 12 having a density of 1.02 g / cm ³ , a melting point of 172 ° C. and a heat of fusion of 48 J / g was used as a core component in Example 1.
Core-sheath composite ratio (volume ratio): plasticized low melting point N12 / PET
= 1/4 and composite spinning was performed at 290 ° C to obtain 218.1d undrawn yarn. Hereinafter, stretching is performed in the same manner, and 90.4
A d / 24f yarn was obtained, and the stability was good. Next, using the obtained raw yarn, false twisting was performed at a heater temperature of 160 ° C. Thereafter, knitting and dyeing were carried out in the same manner, and a friction test (load: 6 kg, 3 seconds) was carried out.

Comparative Example 4 As the core component in Example 1, plasticized low melting point nylon 12 having a density of 1.02 g / cm ³ , a melting point of 147 ° C. and a heat of fusion of 43 J / g was used for the core.
Core-sheath composite ratio (volume ratio): plasticized low melting point N12 / PET
= 1/4, and composite spinning was performed at 290 ° C to obtain an undrawn yarn of 243.0 d. Hereinafter, stretching is performed in the same manner, and 92.0
A d / 24f yarn was obtained, and the stability was good. Next, using the obtained raw yarn, false twisting was performed at a heater temperature of 160 ° C. Thereafter, knitting and dyeing were carried out in the same manner, and a friction test (load: 6 kg, 3 seconds) was carried out.

Comparative Example 5 Low-density polyethylene having a melting point of 114 ° C. and a heat of fusion of 77 J / g was used as a core component in Example 1, and a core-sheath composite ratio (volume ratio): low-density PE / PET = Composite spinning at 290 ° C as 1/4, 2
An undrawn yarn of 43.0d was obtained. Thereafter, stretching was carried out in the same manner, and a 92.0d / 24f raw yarn was obtained, and the stability was good. Next, using the obtained yarn, the heater temperature was 1: 1.
False twisting was performed at 40 ° C. Thereafter, knitting and dyeing were carried out in the same manner, and a friction test (load: 6 kg, 3 seconds) was carried out. As a result, no thread breakage occurred even when pulled, and a perforation phenomenon was not observed, but melting marks were observed.

[0020]

In recent years, there has been a demand for the development of fibers having high friction-melting resistance as sports clothing has been increasingly used in indoor stadiums with wooden floors and ball stadiums with artificial turf. The fiber of the invention is a fiber that slides on the floor surface and does not melt due to frictional heat generated even when excessive friction occurs, and is an optimal fiber for sports clothing.

Claims (3)

(57) [Claims] 1. A polymer wherein the core component polymer has a lower melting point than the sheath component and a heat of fusion of 90 J / g or more.
And a load of 6 kg by a rotor-type friction melting test.
Even after 3 seconds of contact pressure friction, traces of melting can be seen
Sports with friction-melting performance characterized by no
Core-sheath type composite fiber for clothing . 2. A polyester polymer whose main repeating unit is composed of a repeating unit of polyethylene terephthalate is disposed in a sheath portion, and a polymer having a lower melting point and a heat of fusion of 90 J / g or more than the polyester polymer is used as a core. A sports having a friction-melting resistance according to claim 1, which is disposed in a part.
Core-sheath type composite fiber for clothing . 3. A sports garment having friction-melting resistance according to claim 1, wherein a high-density polyethylene polymer is used for the core.
Use core-sheath type composite fiber.