JPH01314703A - Stockings - Google Patents

Abstract

PURPOSE:To obtain stockings excellent in durability and fittness by alternately interknitting polyamide-based synthetic fiber multifilament yarns, etc., and core spun yarns, etc., for each course in at least leg parts. CONSTITUTION:The objective stockings obtained by alternately interknitting (A) polyamide-based synthetic fiber multifilament yarns having 5-20 total denier or textured yarns thereof and (B) core spun yarns of >=100 total count (English cotton count) having a core layer formed from synthetic fiber multifilament yarns of 5-20 denier (most preferably high-tenacity polyamide fiber) or textured yarns thereof and a sheath layer formed from hydrophilic fibers or staples for each course in at least leg parts. Furthermore, the component (A) most preferably has 3.0-4.5 relative viscosity (RV) and 6.0-9.5g/d breaking strength. The constituent ratio of the hydrophilic fiber staples is preferably 50-90wt.%.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention has excellent soft texture, moisture absorption, and durability.
The invention also relates to thin stockings.

(Conventional technology) Support pantyhose, which provide moderate tension to the ankles, calves, thighs, and lower back to relieve fatigue and improve cosmetic appearance, have traditionally been made of nylon multifilament-based materials 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, fine-count spun yarns with hygroscopicity, such as cotton yarns, are produced from #100 to #200 single yarns, but even with #100 single yarns, the breaking strength is usually around 55g, Egyptian cotton, Sea Island yarn ring high quality Even if raw cotton is used, the average is 6
It is about 5g. Generally, when knitting with a stocking knitting machine, etc., in order to maintain smooth operation, the minimum breaking strength of the yarn used must be at least 80 g.
Fine-count cotton yarn with a count of 00 or higher cannot be used as material for stockings.

Furthermore, the fine count currently manufactured using the spun core yarn method is up to 60S. Furthermore, in order to obtain a finer yarn count, even a composite yarn obtained by electro-opening a synthetic fiber multifilament and inserting a roving in a draft can have a maximum yarn count of 80'/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 aim is to create stockings that have both the durability and tightness of conventional products.

(Means for Solving the Problem) The present invention provides that at least the leg portion has a total denier of 5 to 5.
A total count of 20 denier polyamide synthetic fiber multifilament or processed yarn thereof (A), 5 to 20 denier synthetic fiber multifilament or processed yarn thereof as the core layer, and hydrophilic fiber staple as the sheath layer.
Core spun yarn (English cotton count) of 100 or higher (B
) are alternately knitted for each course.

First, the polyamide synthetic fiber multifilament or its processed yarn (8) used in the present invention will be explained. As a material, for example, polycaprolactam (nylon 6)
, polyhexamethylene adipamide (nylon 66) is most suitable. The thickness needs to be 5 to 20 denier, more preferably 5 to 10 denier.
It is denier.

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 is
Relative viscosity (RV') is 2.5-4.5, breaking strength (D
T) is preferably 5.0 to 9.5 g/d, particularly preferably the relative viscosity (RV) is 3.0 to 9.5 g/d.
4.5, breaking strength is 6.0-9.5 g/d. It is particularly preferable that the elongation at break is 6.0 to 9.5 g/d because sufficient strength can be obtained even if the denier of the yarn is reduced, and durability in stonking can be maintained. Relative viscosity (RV) is 3.0 to 4.5, breaking strength ('DT) is 6.
A particularly preferred polyamide synthetic fiber having a relative viscosity of 3.0 to 4.5 is obtained by melt-spinning and then drawing a polyamide having a relative viscosity of 3.0 to 4.5. Of course, it can also be obtained by a direct spinning/drawing method. If this was spun by increasing the relative viscosity, the post-elongation rate would be large at the conventional spinning speed, making winding impossible, so the winding speed would be 1. o6° to 4,000 m/min is preferable, more preferably 1
The speed is 500 to 2000 m/min. In this case, the orientation of the undrawn yarn progresses, and Δn=20 to 60×10−3.

When the undrawn yarn is cold-stretched or hot-stretched at a draw ratio of 1.7 times, a high-strength polyamide fiber having a breaking strength of 6.0 to 9.5 g/d is 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.

Next, the core spun yarn (B) 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 most suitable for the covered yarn 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 yarn strength will be increased, but the blending ratio of hydrophilic fiber staples constituting the sheath layer will be low, and the hygroscopicity will be decreased, which is not preferable. In addition, when the token denier is less than 5 denier, although the blending ratio of hydrophilic fiber staples 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. is also less desirable. Single yarn denier is 0.5 to 5 denier, more preferably 2 to 5
Denier is fine.

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, resulting in the same drawbacks as the covered type 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. It is 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.

The hydrophilic fiber staples that make up the sheath layer of spun core yarn are vegetable fibers such as cotton and linen, animal fibers such as wool boxes,
Alternatively, cellulose-based regenerated fibers such as polynosic, semi-synthetic fibers such as acetate, etc. may be used alone or in a blend of two or more.

However, the composition ratio of hydrophilic fiber staples 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 to 90% by weight. Preferably, the fiber length is 1.5 denier and the effective fiber length is 30 to 60 mm.

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 fiber staples as a sheath layer, and the number n of staple 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. is necessary.

For example, using nylon 15D15' for the core thread, spinning-
7= If the count is 130s/1, the number of pieces n is F≦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 trees, more preferably 25 to 45 trees in the case of 100 count spinning, and 17 to 34 trees in the case of 130 count spinning is good.

Core spun yarns that meet the above conditions can be produced using a conventional core yarn spinning machine. That is, a roving made of hydrophilic fiber staples that meets the above conditions is supplied to the hack roller of a spinning machine, and is drafted at a low rate between it and the front roller to form a fleece. In this method, a slight tension is applied to the center of the frieze, the material is fed, and after passing through a front roller, both are heated and wound into spinning tube yarn.

It is necessary that the above-mentioned polyamide synthetic fiber multifilament (8) and core spun yarn (B) 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 stitches of the stockings from becoming diagonal, it is effective to alternately arrange the polyamide synthetic fibers and core spun yarns with different twist directions in S and Z directions.

Further, in the stockings of the present invention, it is sufficient that the above-mentioned interlaced knitted fabric is used at least in the leg portions, and for example, knitted fabrics made of other materials may be used in the panty portions and toe portions.

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 rng/ml, 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. When measuring, use the same viscometer,
The falling time T of 20 sulfuric acids is the same as when preparing the sample solution. (seconds) and fall time TI of 20 mfl sample solution
(seconds), the relative viscosity of 1'lV is calculated using the following formula.

RV = T + / T0 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 ThicknessGaugI
: Refers to the value measured by PEACOCK.

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 nylon resin with a relative viscosity (RV) 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 canylon filament of 10 denier 5 filament with a breaking strength (DT) of 7.5 g/d obtained by hot stretching at a magnification of 1.7 times was supplied, and twisted at 48 times/inch (twisting coefficient 4.2). Then, core spun yarn (2) of No. 130 was obtained in S twist and Z twist. The average breaking strength is 118g, the minimum strength is 95g,
The U% was 13.0%, the blend ratio of hydrophilic fibers was 75.5%, and the number n of hydrophilic fiber staples in the yarn cross section was 22 on average, and a core spun yarn suitable for the present invention was obtained.

Nylon false twisted yarn ■ On the other hand, nylon resin with a relative viscosity (RV) of 3.55 was spun at a spinning speed of 1500 m/min, and the breaking strength (DT) obtained by hot stretching at a draw ratio of 1.7 was 7.5. g/d high-strength Kanylon multifilament 12 denier 5 filament was used to obtain S-heated false-twisted yarn and Z-heated false-twisted yarn (using Mitsubishi Heavy Industries LS-6 false-twisting machine) with a twist coefficient of 26,500. In addition, twist coefficient - number of false twists x 111, Roe t,
I made it a child's token denier.

Apart from the above ■■, a 30 denier 10 filament of normal nylon filament is used as the covering yarn, and a polyurethane elastic yarn of 30 denier is used as the core.
A covering yarn ■ with 5 twists of 800 T/M was made and used as part of panties.

Using each of the above-mentioned yarns, we used a pantyhose knitting machine with 400 needles and a diameter of 4 inches, and the leg part was made of core spanner = 11 = 1 yarn and nylon false twisted yarn ■ for each course, and the twist direction was also alternated in S and Z. (■S twist, ■S twist, ■Z twist, ■Z twist) and alternate knitting was performed. For the panty part, a slightly thick knitted fabric was obtained using covering yarn ■. The resulting pantyhose has an average thickness of 0.25 to 0.30 at the leg part.
mm, and extremely thin pantyhose containing hydrophilic fibers were obtained, with excellent fit and stretch properties, and extremely good workability during knitting.

(Effects of the Invention) According to the present invention, extremely thin stockings with moisture absorption properties, which were not found in conventional stockings, can be obtained at low cost.
In addition, stockings that have the durability and tightness of conventional products can be obtained.

Patent applicant: Toyobo Co., Ltd.

Claims (1)

[Claims] (1) At least the leg part has a total denier of 5 to 2
A total count (English style) consisting of a 0 denier polyamide synthetic fiber multifilament or its processed yarn (A), a 5 to 20 denier synthetic fiber multifilament or its processed yarn as the core layer, and a hydrophilic fiber staple as the sheath layer. Core spun yarn (cotton count) of 100 or higher (B)
Stockings that are alternately knitted for each course.