JPH01314702A - Fitting stocking - Google Patents

Abstract

PURPOSE:To obtain light-gage stockings excellent in soft touch, hygroscopic properties, stretchability and fitness by alternately interknitting respective specific covered yarns and core spun yarns for each course. CONSTITUTION:The objective stockings prepared by alternately interknitting (A) covered yarns formed from core yarns of rubber-like elastic fiber yarns of 10-30 denier (optimally polyurethane-based synthetic fiber yarn) and covering yarns of polyamide-based synthetic multifilament yarns of 5-20 total denier (most preferably polycaprolactam) or textured yarns thereof and (B) core spun yarns >=100 total count (English cotton count) having a core layer formed from synthetic fiber multifilament yarns of 5-20 total denier or textured yarns thereof and a sheath layer formed from hydrophilic fiber staples for each course in at least leg parts.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention provides soft texture, hygroscopicity, stretchability,
The present invention relates to stockings that have excellent fit and are thin.

(Conventional technology) Support pantyhose, which provide moderate tension to the ankles, calves, thighs, and lower back to relieve fatigue and improve cosmetic appearance, are usually made of nylon multifilament yarn with physical properties or other materials. It was obtained by inter-knitting a processed yarn and a covered yarn made by winding a nylon multifilament yarn with normal physical properties around a polyurethane synthetic fiber yarn.

These stockings are excellent in the above-mentioned functions such as tightness and cosmetic properties, as well as durability and transparency, but they also have moisture absorption and
It lacked heat retention. It also has the disadvantage that it does not meet the recent needs for natural fibers.

On the other hand, as a fine spun yarn with hygroscopicity, for example, cotton yarn is produced from #100 single yarn to #200 single yarn, but even with #100 single yarn, the breaking strength is usually around 55 g, and high-grade cotton such as Egyptian cotton and Sea Island cotton. Even if raw cotton is used, the average is 6
It is about 5g. Generally, a stocking thread count of 8 or more is required, and therefore, the current fine cotton yarns with a count of 100 or more cannot be used as material for stockings.

In addition, the fine count currently manufactured using the spun core yarn method is up to 60"/1. In order to make the count even finer, composite yarn obtained by electrolytic opening of synthetic multifilamen 1~ and draft insertion of rovings. However, the maximum speed is 80s/1.

Although these yarns can be strongly used for stockings, the product becomes thick and the desired product cannot be obtained.

(Problems to be Solved by the Invention) The present invention is an extremely thin product that has hygroscopicity not found in conventional products and has a soft texture due to the fluff of the spun yarn.
The purpose is to obtain stockings that have both the surface durability and tightness of conventional products.

(Means for Solving the Problems) The present invention is characterized in that at least the leg portions are alternately knitted with covered yarns shown below and core spun yarns having a total count (Ei-ni cotton count) of 100 or more for each course. It's a very tight fit.

[Covered yarn]

Core yarn: rubber-like elastic fiber yarn of IO to 30 deniers.

Covering yarn: polyamide synthetic fiber multifilament having a 1-1 denier of 5 to 20 deniers or processed yarn thereof.

[Core spun yarn]

Core layer:) - Synthetic fiber multifilament with a tar denier of 5 to 20 deniers or processed yarn thereof.

Sheath layer: hydrophilic fiber stable.

Note that the term "stockings" as used in the present invention refers to support pantyhose, stockings, or tights.

First, the covered yarn used in the present invention will be explained.

In the present invention, as the rubber-like elastic fiber yarn constituting the core yarn of the covered yarn, polyurethane-based synthetic fiber yarn is most preferable. The thickness needs to be 10 to 30 deniers, and more preferably 10 to 20 deniers. If the thickness of the fiber is less than 10 denier, sufficient tension cannot be obtained, and if it exceeds 30 denier, the thickness of the covered yarn becomes too thick and the tension is too strong, which is not good.

Moreover, as a polyamide synthetic fiber multifilament which is a covering system for covered yarn or its processing system, for example, polycaprolactam (nylon 6) and polyhexamethylene adipamide (nylon 66) are most suitable. The thickness needs to be 5 to 20 deniers, more preferably 5 to 10 deniers. If the thickness of the fiber is less than 5 denier, it will not be strong enough to withstand practical use, and if it exceeds 20 denier, the thin product targeted by the present invention cannot be obtained, so it is excluded from the present invention. The single yarn denier of the covering yarn is 0.5 to 3.
．． It may be 0 denier, more preferably 1.0 to 2.5 denier. When the single yarn denier exceeds 3.0 denier, the number of filaments decreases, and the soft texture is lost, giving a rough and hard feeling, which is not suitable. Further, if the single yarn denier is less than 0.5 denier, the number of filaments becomes too large, which tends to cause stocking and deteriorate durability, which is not preferable.

The polyamide synthetic fiber multifilament yarn has a relative viscosity (RV) of 2.5 to 4.5 and a breaking strength (1
) T) is preferably 5.0 to 9.5 g/d, particularly preferably relative viscosity (R'V) is 3.0 to 9.5 g/d.
4.5, breaking strength is 6.0 to 9.5 g/d. It is particularly preferable that the elongation at break is 6.0 to 9.5 g/d, since sufficient strength can be obtained even if the denier of the yarn is made thinner, and the durability of the stockings can be maintained. Relative viscosity (RV
) is 3.0 to 4.5, and breaking strength (DT) is 6.0 to 9.
A particularly preferred polyamide synthetic fiber having a relative viscosity of 5 g/d is obtained by melt-spinning polyamide having a relative viscosity of 3.0 to 4.5 and then drawing it. Of course, it can also be obtained by a direct spinning/drawing method. If this is spun by increasing the relative viscosity, the post-elongation rate will be large at the conventional spinning speed, making winding impossible, so the winding speed is preferably 1.000 to 4,000 m/min. More preferably 1500-2000m/
It's a minute. In this case, the orientation of the unstretched system progresses, and △n-2
0 to 60 x 10-3. The undrawn yarn has a stretching ratio of 1.
When cold-stretched or hot-stretched at 7 times, the breaking strength is 6.0.
High tenacity polyamide fibers with extremely high strength of ~9.5 g/d are obtained. Further, in order to minimize the decrease in strength due to heat treatment in a subsequent step, a hot stretching method is more preferable.

A covered yarn is constructed by winding the above-mentioned elastic yarn around a core yarn and the covering yarn, but the winding direction may be either a right-handed direction, a left-handed direction, or an X-shape that is a combination of both. The number of windings is preferably 1500 to 3000 T/M.

Next, the core spun yarn used in the present invention will be explained. The synthetic fiber multifilament yarn or its processed yarn constituting the core layer of the core spun yarn is preferably a polyamide-based synthetic fiber, and more preferably a high-strength polyamide fiber that is optimal for the covered system described above. The thickness needs to be 5 to 20 deniers, more preferably 10 to 15 deniers. If the torque denier exceeds 20 denier, the thread strength will be increased, but the blending ratio of the hydrophilic fiber stable constituting the sheath layer will be low, and the hygroscopicity will be lowered, which is not preferable.

In addition, when the toque denier is less than 5 denier, although the blending ratio of hydrophilic fiber stable increases, the strength of the core spun yarn decreases, and yarn breakage occurs frequently when knitting with stocking knitting machines, etc., and the durability of the product decreases. It is also undesirable because of its inferiority. Single yarn denier is 0.5 to 5 denier, more preferably 2 to 5 denier.
5 denier is sufficient.

Further, it is desirable that the number of filaments is three or more.

When the single yarn denier exceeds 5 denier, the number of filaments decreases, causing the same drawbacks as the covered yarn described above, and when the single yarn denier is less than 0.5 denier, the strength tends to decrease and the yarn becomes too soft. Easy to cause defects. Furthermore, it is preferable that the number of filaments is less than 3 because the wrapping force of the sheath layer is likely to decrease when formed into a core spun yarn.

Hydrophilicity of the sheath layer of the spun core yarn -7 = Fiber staples are made of vegetable fibers such as cotton and hemp, animal fibers such as wool and silk, cellulose-based recycled fibers such as polynosic, semi-synthetic fibers such as acetate, etc. alone or It can be used as a blend of two or more types.

However, the composition ratio of the hydrophilic fiber stable in the core spun yarn is preferably 50 to 90% by weight, and in order to coat the synthetic fiber multifilament or its processed yarn as uniformly as possible, the average fineness should be 0.9. ~1.5 denier and an effective fiber length of 30 to 60 mm are preferred.

The core spun yarn consisting of the core layer and sheath layer needs to have a fine English cotton count of 100 or more. If the number is less than 100, the product becomes thick and flimsy, and the thin product that is the object of the present invention cannot be obtained, so it is excluded from the present invention.

Here, the core spun yarn will be explained in further detail.

A core spun yarn is obtained using hydrophilic stable fibers as a sheath layer, and the number n of stable fibers in the yarn cross section can be calculated using equation (1), and n satisfies equation (2) based on the average denier of the staples used. It is necessary to.

For example, if we use nylon 151115' for the core thread and make a spinning count of 130"/1, the number of constituent threads n is 17≦n
≦29. As a result of various studies to obtain a core spun yarn with a count of 100 or higher, the number of yarns n is 13 to 5.
It has been found that a range of 3 wood, more preferably 25 to 45 wood for 100 thread spinning, and 17 to 34 wood for 130 thread spinning is good.

Core spun yarn meeting the above conditions can be produced on a conventional core yarn spinning machine. In other words, a roving made of stable hydrophilic fibers that meets the above conditions is supplied to the hack roller of a spinning machine, is drafted at a low rate between it and the front roller to form a fleece, and then the core yarn is continuously placed just before the front roller. This is a method in which young children are supplied under tension to the center of the freeze, and after passing through a front roller, both are heated and wound into spinning tube yarn.

It is necessary that the above-mentioned covered yarn and core spun yarn are alternately knitted in each course. If this condition is not met, the homogeneity and appearance of the product will be significantly reduced, which is undesirable. Furthermore, in order to prevent the stocking stitches from being diagonal, it is effective to alternately arrange covered yarns and core spun yarns with different twist directions in S and Z directions.

In addition, the stockings of the present invention have at least the astragalus portion.
It is only necessary to use a fabric made of a two-dimensional cross 'tX'tlA fabric, and it is of course possible to use a knitted fabric made of another material for the panty portion and toe portion, for example.

In the present invention, relative viscosity and breaking strength refer to values measured by the following method.

A sample solution was prepared by dissolving the sample in reagent special grade concentrated sulfuric acid with a relative viscosity of 96.3 ± 0.1% by weight so that the polymer concentration was 10 mg/mR, and the temperature was 20°C ± 0.05°C. Measure the relative viscosity of the solution using an Ostwald viscometer with an ice fall time of 6 to 7 seconds. During the measurement, the same viscometer was used to prepare the sample solution, and the falling time T, (seconds) of 20 ml of sulfuric acid, and the falling time T, (seconds) of 20 ml of sample solution.
(seconds), the relative viscosity RV is calculated using the following formula.

RV = T I / T.

Breaking strength is measured one by one using Tensilon manufactured by Toyo Baldwin (g/d).

(Examples) The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples. In addition, in the examples, the thickness of the fabric is Dial Thickness Gauge.
: Refers to the value measured by P'EACOCK.

Example 1 Core spun yarn ■ Cotton roving (average denier 1.38 effective force fiber length 36 mm)
is fed to the hack roller of a ring spinning machine and subjected to a total draft of 45 times, while a nylon resin with a relative viscosity (calendar) of 3.55 is spun at a spinning speed of 1500 m/min as a core yarn just before the front roller and drawn. A high-strength iron filament with a breaking strength (DT) of 7.5 g/d obtained by hot stretching at a magnification of 1.7 times, Ironficimene 1-10 denier 5 filament was supplied, and 48 turns/inch (twisting coefficient 4.2) Twisting was applied to obtain 130-count core spun yarn ■ in S-twist and Z-twist. The average breaking strength is 118 g, the minimum strength is 95 g, the U% is 13.0%, the mixed ratio of hydrophilic fibers is 75.5%, and the average number n of hydrophilic fiber stable structures in the cross section of the system is 22, and the present invention A core spun yarn suitable for this purpose was obtained.

Covered yarn ■ The covering yarn uses 20 denier ether-based polyurethane elastic yarn as the core yarn, and has a relative viscosity (R
V) 3.55 nylon resin spinning speed 1500m/m
A polyurethane elastic system was fabricated using a single covering machine using a high-strength multifilament 12 denier 5 filament with a breaking strength (DT) of 7.5 g/d obtained by spinning in and hot stretching at a draw ratio of 1.7. The yarn was drafted 3 times and covered with the covering yarn 1800 times/make to obtain S and Z twisted covered yarns, respectively.

Covered Yarn■ Apart from the above ■■, a nylon filament of 30 denier and 10 filament is usually used as the covering system, and a polyurethane elastic yarn of 30 denier is used as the core, and draft 3.
A covered yarn ■ with 5 twists of 800 T/M was made and used for a part of panties.

Using a pantyhose knitting machine with 400 needles and a diameter of 4 inches, using each of the above-mentioned yarns, the core spun yarn ■ and covering yarn ■ were used for each course in the astragalus section, and the twist directions were also alternated in S and Z (■ S twist, ■S twist, ■Z twist, ■Z twist) were arranged and alternately knitted. For the panty part, a slightly thick knitted fabric was obtained using covering yarn ■. The obtained pantyhose had an average thickness of 0.30 to 0.35 mm at the leg part, and was extremely thin for a support pantyhose containing hydrophilic fibers, with excellent fit and stretch properties. Operability during knitting was also extremely good.

(Effects of the Invention) According to the present invention, it is possible to obtain stockings that are extremely thin and have hygroscopic properties that were not found in conventional stockings, and also have the durability and tightness of conventional stockings.

Patent applicant: Toyobo Co., Ltd.

Claims (1)

[Claims] (1) Fitting stockings in which at least the leg portions are alternately knitted with covered yarn shown below and core spun yarn having a total count (English cotton count) of 100 or more for each course. [Covered yarn] Core yarn: Rubber-like elastic fiber yarn of 10 to 30 deniers. Covering yarn: polyamide synthetic fiber multifilament or its processed yarn with a total denier of 5 to 20 deniers. [Core spun yarn] Core layer: Synthetic fiber multifilament or processed yarn thereof with a total denier of 5 to 20 deniers. Sheath layer: hydrophilic fiber staples.