JPH03220301A - Stocking - Google Patents

Abstract

PURPOSE:To obtain stockings having excellent elasticity and transparent feeling, providing a pleasant feeling in wearing by knitting leg parts by alternately arranging conjugate yarn comprising polyurethane and polyamide and covering yarn consisting of polyurethane elastic yarn as core yarn. CONSTITUTION:Conjugate yarn 4 which comprises two components of a polyamide component A and a polyurethane component B and has structure in which, in a cross-section of monofilament, a polyurethane core component B is laid in an eccentric state in a polyamide sheath component A and the polyurethane core component B is uniformly exposed to the surface of fiber by a neck part D passing through a thin part C of the polyamide sheath component A and covering yarn 5 consisting of polyurethane elastic yarn as core yarn are arranged alternately one by one to give the objective stockings wherein at least leg parts 2 are knitted among pantystockings P composed of three parts of panty part 1, leg parts 2 and foot parts 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to stockings with excellent elasticity, comfortable tightening that provides a feeling of wearing with soft force, and a transparent and beautiful appearance. It is something.

[Conventional technology]

Conventionally, bulky crimped yarn made from thermoplastic synthetic fibers with good elasticity has been used as yarn for stockings.

Highly twisted torque yarns have been used.

In recent years, single covered yarn (SCY)
, or stocking yarn called double covered yarn (DCY) is often used. These stockings are made of polyurethane elastic yarn (spandex) filament yarn as a core and covered with nylon yarn, and have extremely excellent elongation elastic recovery power. ” and many are on the market.

And recently, stockings have a particularly strong tightening force.
It has become popular because it makes the legs look beautiful and has the effect of relieving leg fatigue. This is 70 denier,
The most extreme type is made of 140 denier thick polyurethane elastic thread covered with nylon, and exhibits unprecedented tightening strength.

[Problem to be solved by the invention]

However, as mentioned above, the tightness of stockings using covering yarn with polyurethane elastic yarn as the core yarn was aimed only at the effect, and the texture was hard and gave an extremely tight feeling. .

In addition, the thicker the polyurethane elastic thread was made in order to increase the tightening force, the less transparent it became, resulting in a dull image.

Furthermore, as the amount of polyurethane elastic yarn used increases, the abrasion resistance strength decreases accordingly, causing problems such as the polyurethane peeling off to the surface and becoming sticky, and the knitted fabric stretching out after washing and not being able to recover. Ta.

The present invention was made in view of the above circumstances, and aims to provide stockings that have sufficient elasticity and strong tightening properties, are soft to the touch when worn, and have excellent transparency. It is something.

[Means to solve the problem]

In order to achieve the above objective, the stockings of the present invention:
It has a structure in which at least the leg portions are knitted by alternately arranging composite threads made of a two-component polymer of a polyurethane component and a polyamide component and one covering thread having a polyurethane elastic thread as a core thread.

Further, the above-mentioned composite yarn has a polyurethane core component arranged eccentrically in a polyamide sheath component in the cross section of a single filament, and the polyurethane core component is formed by a neck portion penetrating the thin wall portion of the polyamide sheath component. It is preferable to use a structure in which the fiber is uniformly exposed on the fiber surface.

[Effect]

In this structure, the composite yarn exhibits excellent stretchability with a soft touch due to its characteristic self-crimping, and the tightening by the covering yarn with polyurethane elastic yarn as the core yarn allows the force to be applied flexibly. .

In addition, by inter-knitting the composite yarn and covering yarn,
Not only does it have sufficient elasticity, but it also provides excellent transparency when worn.

Furthermore, even after washing, the self-crimping properties of the composite yarn remain in effect, providing excellent return power and preventing the knitted fabric from becoming completely stretched.

〔Example〕

Hereinafter, embodiments of stockings according to the present invention will be described based on the drawings. Stockings as used in the present invention include over-the-knee stockings that reach above the knees, full-length stockings that extend to the base of the thighs, and pantyhose that combine a panty portion and a stocking portion.

FIG. 1 shows an example in which the present invention is applied to pantyhose. This pantyhose (P) is composed of three parts, a panty part (1), a leg part (2), and a foot part (3), as usual.
is a raw yarn appropriately selected from woolly nylon, polyurethane covering yarn, etc., and is knitted into a stretchable knitted structure.

The leg portion (2) and foot portion (3) are made by alternately using one composite yarn (4) and one covering yarn (5) having a polyurethane elastic yarn as the core yarn, as shown in Fig. 2. organized.

The composite yarn (4) referred to in the present invention is a so-called conjugate yarn in which polymers of a polyurethane component and a polyamide component are supplied separately and the two are bonded together during spinning. In this example, a composite yarn (4) as shown in FIG. 3, which has particularly excellent crimp performance and abrasion resistance, is used.

In this composite yarn (4), a polyurethane core component B is arranged in a polyamide sheath component A in an appropriate eccentric relationship with an appropriate bonding ratio, and the polyurethane core component penetrates the thinnest interior C of the polyamide sheath component. The fibers are exposed uniformly on the fiber surface due to the neck portion. The exposed width of the fiber surface at this neck portion is approximately 2 to 2596 of the fiber circumference.
, preferably within the range of S to 1506, thereby making it substantially uniform. That is, if the exposure width is too small than the above range, crimpability will be insufficient, and if it is too large, it will cause problems such as sticking.
This is not preferable because there is a tendency for the wear resistance to deteriorate due to peeling of the two components.

In addition, the bonding ratio of the polyamide component and the polyurethane component is preferably 40' (i0~8°20, more preferably 45'55~70.30 in terms of volume ratio), and good crimp characteristics can be obtained within this range. .

The polyamide applicable to the present invention is preferably poly-ε-cabramide and a copolymer containing 80 moles or less of a copolymer component thereto. Of course, polyhexamethylene adipamide and other known polyamides, copolymers and mixtures thereof, etc. are also applicable.

Moreover, the polyurethane suitable for the present invention has a Shore hardness of A
(7) Measurement standard JIS K-6801i: Therefore, it is a thermoplastic polyurethane elastomer with a measured hardness of 90 to 100, such as polyester polyurethane and polycaprolactone polyurethane.

Examples include polycarbonate polyurethane. Polyurethane with a hardness of less than 90 has a melt viscosity balance with polyamide (<< (difficult for stable spinning)), while a polyurethane with a hardness of more than 100 tends to have a poor elastic recovery rate. Furthermore, a more preferable polyurethane in terms of suppressing adhesion between two components is a polycarbonate polyurethane, and most preferably a polyester polyurethane in which the soft segment is a polycarbonate (mixing weight ratio of the two components: 8, -'2 to 4/6). It is.

Such a composite yarn (4) can be manufactured using a die device as shown in FIG. That is, the molten polyamide component is supplied from the polyamide guiding groove (6), and the molten polyamide component is supplied from the conduit (6).
7) and then extruded from the spinneret orifice (8). On the other hand, the molten polyurethane component has polyurethane guide grooves (
9) and is supplied by the injection pipe (1o) to the conduit (
7) Injected into the body.

This injection pipe (lO) is inclined and a conduit (
7) penetrates and protrudes into the interior and opens just before the orifice (8). The inner diameter of the injection pipe (1o) is set in a range of 30 to 80% of the inner diameter of the conduit, depending on the proportion of the same component joining of the composite yarn (4). In addition, in order to obtain an appropriate degree of eccentricity of the polyurethane component in order to impart good crimp performance to the resulting composite system (4), the protrusion length and inclination angle of the injection pipe (1o) are as follows:
In the projected figure of the pipe (10) on a horizontal plane,
The inner circumferential upper edge of the pipe tip is approximately 12 to 34 mm larger than the diameter of the conduit (7).
It is preferable to select an appropriate length so that the protruding length of the inner circumferential lower edge of the pipe tip is approximately 2 to 20% of the diameter of the conduit (7).

However, the most important point in the above method is that inside the conduit (7) of the injection pipe (1o)...a slit (J]) extending in the longitudinal direction of the pipe (1o) is formed over the entire length of the lower surface of the protruding part. It is because it was founded. Here, the lower surface refers to the portion along the lower generatrix including the vertical plane passing through the central axis of the pipe. If the position of this slit (11) deviates from the bottom surface, the neck portion formed by the slit (11) will be deviated from the thinnest interior C of the polyamide component.
There is a possibility that the crimp characteristics of the resulting composite yarn may be deteriorated. The width of the slit (11) is approximately 0.2 to 0.2 of the circumference of the conduit (7).
Preferably it is 10.0%. That is, the width is 0.2%
If it is less than 20%, the desired composite form may not be obtained, and a complete core-sheath type may result. In addition, since the polyurethane component exceeds IO and Oo6 and is exposed too much on the surface of the resulting fiber, the abrasion resistance, which is a drawback of the site-by-site type composite yarn, is poor, and the undrawn yarn wound up tends to stick. It is preferable to avoid it because it will cause severe adverse effects.

By applying such an injection pipe (10),
The polyurethane component is combined with the polyamide component flowing inside the conduit (7) with an appropriate bonding ratio and eccentricity, and
The polyurethane component flowing vertically down from the slit (11) along the wall surface of the conduit (7) is inserted into the thin layer of the polyamide component and spun out from the orifice (8) to form a composite yarn.

At this time, since the opening of the protruding portion of the injection pipe (10) is located just before the orifice, the relative arrangement of the same components is maintained substantially undisturbed in the spun filament.

The shape of the orifice may be straight cylindrical, but the stress relaxation effect reduces double ink (bending phenomenon of the ejected polymer immediately after spinning), and the adhesion of polymer decomposition products to the orifice mouth edge causes thread breakage. From the perspective of preventing
It is preferable to form the

In addition, the polyamide component applied to this method is 95.70
6 The relative viscosity measured at a concentration of 1% in sulfuric acid is in the range ZO to Z6, while polyurethane can have a melt viscosity of 20.000 to 50.000 voids measured at 210°C using a flow tester. preferable. If the viscosity difference decreases outside this range, good crimp characteristics cannot be guaranteed, and if the viscosity difference is too large, due to the 2-ing phenomenon,
There is a risk that stable spinning will not be possible.

After cooling and solidifying the spinning line according to the conventional method, it is wound onto a bobbin.
Next, the wound undrawn yarn is stretched at an appropriate stretching ratio,
Further, a method may be used in which the material is subjected to heat treatment and then wound up into a burn or cheese shape, or a method in which the material is melt-spun, cooled, and then directly stretched or heat treated without being wound up first.

However, since the neck portion is formed using the injection pipe (10) described above, the shape and exposed width of the neck portion are uniform, and fluctuations due to temperature conditions and other influences are extremely small. Of course, in a preferred embodiment, the standard deviation of exposure width variation within lots with the same specifications is less than z o o 6! , 606 or less. This results in uniformity of the undrawn yarn and reduced sticking, improving the knitting properties of stockings, and greatly reducing defects such as weft rows in the knitted fabric, resulting in a knitted fabric of excellent quality. It becomes a thread.

Next, a composite yarn was actually manufactured using the method described above, and its physical properties were measured.

First, 6-nylon with a relative viscosity of 2.35 and 210°C
Melt viscosity measured at 32.000 poise.

Polycarbonate polyurethane having a Shore A hardness of 95 was melted separately, then weighed separately at a volume ratio of 50:50, and then heated to 235°C in a composite spinneret as shown in Figure 4 to produce 55d,/2f. The undrawn yarn was composite-spun at a winding speed of 500 m7'. The composite spinneret used at that time had a conduit (7) with an inner diameter of 2 mmφ, a polyurethane injection pipe (10) with an inner diameter of 1 mm, and an outer diameter of 1.26 mmφ.
Met.

The angle between the conduit (7) and the polyurethane injection pipe (10) is 35°, and the distance between the lower edge of the inner circumference of the tip of the pipe (10) and the inner wall of the conduit (α in Fig. 4) is 0.16 mm. did. The length of the slit at the bottom of the injection pipe (β in FIG. 4) was 0.4 mm, and three types of composite spinnerets with the following slit widths were used.

Slit width (mm) 0.02 0.10 0.50 Next, the three types of undrawn yarns wound up were subjected to stretching to relaxation heat treatment, and the three types of composite yarns Y, Y, Y, 17d, '2f, ,
I got Y.

Table 1 shows the measurement results of the physical properties of these three types of composite yarns Y, Y*, and Y. In addition, each measurement method was as follows.

In other words, the thread is approximately 1,000 denier in thickness and approximately 50 cm in length.
A skein-like shape is applied, a load of log/d is applied, and this length is made into an original length of 1. shall be. Next, apply a load of 1g and immerse it in boiling water for 10 minutes.
After carrying out a crimp development treatment for a minute and leaving it for day and night, the length (l,) is measured with an Ig load applied.

The shrinkage rate is calculated according to the following formula (1).

Shrinkage rate (%) = CI! o-z,),,i. ×100・
...(1) The elongation rate was 250
Apply a load of 10g, /d, process for 10 minutes in boiling water, leave it for a day and night, measure the original length (l,), then apply a load of 10g, /d, and measure the length (i,). It is calculated from the following equation (2).

Elongation rate (%) ” CIl* −Is＞/Il=X
100...(2) Abrasion resistance is determined by circularly knitting the fibers that have been heat-treated for stretching and relaxation, continuously reversing the abrasion under a load of 1 kg, and then measuring the IM separation of the two components on the surface of the knitted fabric. Evaluation was made by observing with a microscope.

In addition, this composite yarn was used on a regular 40 tubular knitting machine (
After knitting at a rotational speed of 600 rpm using a machine (with 400 needles), the circular knit was subjected to relaxation heat treatment in hot water to develop crimp, and the weft row defects were observed. As you can see, the width of the exposed part of the composite yarn obtained by the above method is 10 times the outer circumference of the fiber! %, it has been confirmed that it has excellent crimpability and abrasion resistance among a wide variety of composite yarns, and the quality of the knitted fabric is also good, so it is suitable as a raw yarn for stockings. It becomes clear that it is something.

And the other covering thread (5) is 20 to 14
0d polyurethane elastic thread covered with nylon thread. This nylon thread has a fineness of 10 to 20
d. The number of filaments is 1 to 7, preferably 13.
~15d, 2 to 3 woolly yarns, kennel yarns, etc., as appropriate.

Whether the covering should be single or double can be selected based on the thickness of the polyurethane elastic thread and the required tightening power.

In stockings according to the present invention, the covering yarn (5) and the composite yarn (4) described above are alternately knitted one by one, but this is done in consideration of the beauty of the knitted surface. . That is, when the alternating knitting structure is made into a 1:2 or 2:1 structure, both yarns (4) are created.

The characteristic (5) appears unbalanced on the knitted surface, which is unfavorable in terms of appearance.

As the covering yarn, we used a 20 d polyurethane elastic yarn double-covered with 13 d 5 f woolly nylon, and as the composite yarn, we used one of the above-mentioned yarns with a slit width of 0.1 mm for the injection pipe.
0 seamless stockings edition v1 (rotation speed 60 Orp
Stockings were obtained in which leg portions and foot portions were formed using alternately knitted fabric according to m). As comparative examples, one knitted with the composite yarn 10096 of the example (Comparative example A), one knitted with the covering yarn 10096 of the example (comparative example B), and the same composite yarn and covering yarn knitted at 1°3. A cross-knitted one (comparative example C) was made, and 3
A wearing test was conducted by 0 people.

In addition, when these stonkings were put in a laundry net, washed in a washing machine, worn for about 6 hours, and washed again for 3 cycles, the ones from the comparative example had poor recovery power and were not as good as the original. Although it was more likely to stretch than the case, the example was able to maintain its original size even after washing.

〔Effect of the invention〕

As described above, the stockings of the present invention exhibit excellent elasticity with a soft touch due to the self-crimping property of the composite yarn, and the tightening by the covering yarn with polyurethane elastic yarn as the core yarn reduces the force to hard tightening. It is not a feeling, but something that makes you feel comfortable.

In addition, it has sufficient elasticity, has excellent transparency, and has a beautiful appearance on the surface of the knitted fabric.

Furthermore, it has excellent recovery ability after washing, and does not lose its original dimensions even after repeated washing and wearing.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the stocking of the present invention, Fig. 2 is an explanatory diagram of its knitting structure, Fig. 3 is an explanatory diagram of the composite yarn used in the same embodiment, and Fig. 4 is a diagram illustrating the composite yarn used in the same embodiment. FIG. 2 is a schematic vertical cross-sectional view of the spinneret device used for manufacturing the composite yarn shown in FIG. (1)...Panty part, (2)...Leg part. (3)...Foot part, (4)...ti doubling thread. (5)...Covering thread. (P)...Pantyhose. A...Polyamide component. B...Polyurethane component, C...Thin wall portion. D...Neck part. Figure 1 Figure 3 Figure 2

Claims (1)

[Scope of Claims] 1) One composite yarn (4) composed of a two-component polymer of a polyurethane component and a polyamide component and one covering yarn (5) having a polyurethane elastic yarn as a core yarn are arranged alternately. Stockings with at least the leg portion (2) knitted. 2) The composite yarn (4) according to claim 1 has a polyurethane core component arranged eccentrically in a polyamide sheath component in the cross section of a single filament, and the polyurethane core component is arranged in a thin-walled portion of the polyamide sheath component. A stocking whose fiber surface is uniformly exposed through the neck section.