JPH04108101A - Production of stockings - Google Patents

Abstract

PURPOSE:To obtain stockings excellent in feeling of wearing by knitting polyurethane-based rubber-like elastic yarn as core yarn, partially irradiating the resultant stockings with ultraviolet rays, reducing stretch elastic modulus of the aforementioned rubber-like elastic yarn and changing wearing pressure according to parts for wearing. CONSTITUTION:Conjugate elastic yarn composed of core yarn of polyurethane- based rubber-like elastic yarn and covering yarn of polyamide-based synthetic multifilament yarn alone or, together with, polyamide-based synthetic multifilament yarn is alternately fed to knit stockings and a substance such as a titanium-based substance is then applied to, e.g. a part (A). A light-shielding object is provided in a part (C) and the stockings are irradiated with ultraviolet light at 350-400nm wavelength at 190 deg.C under dry heat conditions for 30min to afford the objective stockings with tightness feeling at the maximum in the arch of the foot and the minimum in the femoral part.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of manufacturing stockings that takes comfort into consideration by changing the wearing pressure depending on the region where the stockings are worn. Note that the term "stockings" as used in the present invention includes not only stockings but also pantyhose.

(Prior Art) Stockings have been known that have elasticity to improve cosmetic appearance and relieve fatigue. This can be obtained by inter-knitting a covered yarn in which a nylon multifilament is wound around a polyurethane synthetic fiber yarn and a nylon multifilament or its processed yarn, or by knitting only the covered yarn in the front (commonly known as zokki). However, in these stockings, the thickness of the polyurethane elastic thread used to add elasticity is simply changed between the panty part and the leg part. It is not possible to suitably change the wearing pressure at each region, especially the leg region, such as the calf and thigh.

In addition, as a means to appropriately change the wearing pressure of each part mentioned above, it is possible to change the knitting structure or the size of the stitch loops, but the former is because the knitting structure generally used is the most basic plain knitting structure. , when using other tissues, the appearance, thickness,
If the texture changes to a wide width, and if other tissues are used partially, the wearing pressure can be changed to a large width, especially in the lug part, but the appearance, thickness, and texture are too different from the plain knitted part. I can't get what I want.

In addition, the method of changing the size of the loop of the latter stitch is as follows.
Generally speaking, a method is adopted in which a part such as the ankle, calf, or thigh is determined, and a loop length (generally called a loop length) is set according to the thickness of each part, and the circumference length of each part is changed.
Changes in yarn speed during knitting due to changes in stitches, changes in knitting speed,
Due to changes in the lifting distance of the knitting needles, considerable skill is required to maintain high operability in actual production, and since this method changes in the same way within the same circumference of the stocking, adjustment within that area is required. is extremely difficult. For example, the required wearing pressure is different for the calf region and the shin region, and this method cannot adequately meet the requirements.

In order to compensate for these, generally the foot is placed in a mold and heated to set it after the dyeing process, but it is difficult to make partial adjustments.
The elastic thread used in regular stockings is used in the leg section (
(from toes to thighs) and panty area (buttocks, lower back)
We use different thicknesses to change the wearing pressure, but inside the leg part and part of the panty, the elastic thread is of the same thickness, so
It is not possible to appropriately change the wearing pressure of each part within these parts.

(Problems to be Solved by the Invention) An object of the present invention is to provide stockings that are comfortable to wear and that vary the wearing pressure depending on the region where they are worn.

(Means for Solving the Problems) That is, the gist of the present invention is as set forth in the claims. Alternatively, the covering yarn is preferably formed by arranging at least one or more preferably I to two polyamide synthetic fiber multifilaments having a single filament denier of 0.5 to 3.0 deniers and a torque denier of 5 to 30 deniers. Stockings knitted with composite elastic yarns, or stockings and kings knitted with composite elastic yarns and polyamide multifilament or its processed yarn alternately for each course, are dyed and processed using foot prints. At the same time as heating, the desired area is irradiated with ultraviolet rays to moderately reduce the elasticity of the elastic yarn in that area to suit the needs, and the pressure applied to different areas when worn is changed to create stockings that are comfortable to wear. There is a particular thing.

In order to find out what constitutes stockings that are comfortable to wear, the inventors first manufactured various types of stockings and analyzed their comfort through wear evaluation. As a result, it was found that the main factors that affect the feeling of wearing are the feel, fit, tightness, and appearance.

Among these, regarding the feel and appearance, the thickness, number of filaments, cross-sectional shape, gloss, and It has been found that there are many factors related to the morphology that are due to individual differences, and that there are many factors that are difficult to clearly quantify. on the other hand,
As a result of various analyzes regarding the fit and tightness, it was found that although there are people who like tightness and people who do not like it, they all tend to be the same.

In other words, the best wearing feeling is achieved when the tightness is strongest at the foot of the leg and gradually becomes less tight at the ankle, calf, and thigh.

Therefore, the inventors created a standard foot shape for Japanese women and attached a number of special pressure measurement sensors to it in order to quantify these pressure-measuring sensations. The device was placed so that the pressure at each location could be measured. These measurement results will be described later.

On the other hand, the inventors discovered the following phenomenon while conducting various research on the physical properties of polyurethane-based rubber-like elastic threads.

That is, when a polyurethane rubber-like elastic yarn is irradiated with ultraviolet rays having a wavelength within a certain range for a long time, its elastic modulus decreases. As a result of further investigation, we found that this tendency is large in the case of near-ultraviolet rays with a wavelength of 350 to 400 nm (nanometers), and that this is related to the distance from the light source, the light energy, the temperature of the spot, etc.
It was also found that the closer the distance from the light source and the higher the temperature, the greater the tendency.

It has also been found that ultraviolet rays in the wavelength range of around 290 to 320 nm and in the visible light range have a large effect (discoloration, fading, etc.) on the polyamide synthetic fibers used in stockings. Although these phenomena occur in the natural world under extremely extreme environments, the present inventors have found a method of utilizing these phenomena for the purpose of the present invention.

In other words, stockings knitted with a composite elastic yarn formed by arranging a polyurethane-based rubber-like elastic yarn as a core yarn and arranging at least one polyamide-based synthetic fiber filament as a binding yarn or covering yarn, or the composite elastic yarn. Thread and polyamide-based synthetic multifilament or its processed yarn are alternately knitted for each course, and the stonking is dyed and processed, and then it is put into a foot last and set, or in the subsequent process, it is put into a foot last and reset. In each stage, the desired area is irradiated with ultraviolet light for the required time. A carbon arc lamp is suitable as an ultraviolet light source, and the desired near ultraviolet wavelength (
350-400 nanometers) is preferably passed through an optical filter.

In addition, in order to increase the irradiation effect in a short time, dry heat
°C or more and 195°C or less, thermal temperature is 115°C or more and 12
It is desirable that the ambient temperature be 0'C or lower, and each part of the foot print desired to be irradiated may be coated with a substance that improves the reflection of ultraviolet rays, such as titanium. In addition, it is advisable to mask areas that are not desired to be irradiated with an optical filter or other material so that the ultraviolet rays do not hit the area. Note that in order to make the boundary between the irradiated part and the non-irradiated part unclear, it is better to change both in stages.

(Examples) Example 1 The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples.

Nylon multifilament 10 denier 5 filament was used as the covering yarn, spandex filament yarn 30 denier was used as the core yarn, the spandex draft was set to 3.3 times, and the first twist was 270.
0. A double-covered X-shaped yarn with a ply twist of 2400 T/M and a nylon multifilament yarn of 15"-5' were used as the mixed knitting yarn, and both were knitted using a pantyhose W machine with a needle count of 400 and a diameter of 4 inches. Each course was alternately knitted at a ratio of 1:1, and the stitch loop length at the time of 0 knitting to obtain support stockings was shortened by about 10% in each section.

After relaxing and dyeing the support stonking, it was placed in a foot mold as schematically shown in Figure 1, and then subjected to a dry heat setting and then irradiated with ultraviolet rays. In the foot shape shown in Figure 1, part A is the part that is irradiated with ultraviolet rays, and this part is coated with titanium or the like to improve the reflection of the ultraviolet rays. Also, part B is A, C
It is located between the two AC parts, and no reflective material is applied to blur the boundary between the two AC parts, so that only ultraviolet rays or only ultraviolet rays that have passed through a filter are exposed to it. Part 0 indicates a portion where a light-shielding object is provided close to the last of the foot so that no ultraviolet rays are exposed to it.

A carbon arc lamp was used as a light source for ultraviolet light, and ultraviolet light having a wavelength of 350-b was obtained through an optical filter. Also, the distance to the foot shape with the Panty Stone King attached was made as short as possible. The ambient temperature was set to 190° C. by dry heat, and the treatment time was 30 minutes.

Comparative Example 1 Pantyhose were knitted using the same yarn as in the example and under the same knitting conditions as before.

After relaxing and dyeing the pantyhose, the pantyhose was placed in a foot mold and heated at 118°CiW for 60 seconds to form a product.

FIG. 2 shows the wearing pressure of each part of the pantyhose obtained in Example 1 and Comparative Example I.

The support stonking obtained in the Examples and Comparative Examples was worn on a monitor, and sensory evaluation was performed to determine the feeling of pressure in each part,
As a result of comparing the fit %, the presence or absence of sag, etc., the sample of Example 1 was evaluated as being extremely good in correlation with the pressure of each part shown in FIG.

[Brief explanation of the drawing]

FIG. 1 shows an example of the ultraviolet irradiated portion of the stocking of the present invention, and FIG. 2 shows the stocking pressure obtained by the method of the present invention.

Claims (1)

[Claims] (1) Stockings are knitted by supplying a composite elastic yarn consisting of a core yarn of polyurethane-based rubber-like elastic yarn and a covering yarn of polyamide-based synthetic fiber multifilament yarn either alone or alternately with polyamide-based synthetic fiber multifilament yarn. and then partially irradiating the stockings with ultraviolet rays to appropriately reduce the stretching force of the polyurethane rubber-like elastic yarn in that part depending on the purpose.