JPH07841B2 - Stocking - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a stocking made of a polyamide yarn, and more particularly to a stocking having no color difference and made of a plurality of polyamide yarns having different spinning speeds.

<Conventional technology and problems> Conventionally, polyamide yarns for stocking have a high spinning speed.
After melt-spinning at 2,000 m / min or less, it is wound or drawn about 3 to 4 times without drawing (stretched yarn), and then bulked by false twisting, or a spandex yarn. It is manufactured by a method in which a drawn yarn is wound around (covering yarn). In recent years, with the development of high-speed spinning technology, a method of directly drawing false-twisting a yarn (POY) spun at a speed of 3,000 m / min or more without a drawing step has been put into practical use.

Various polyamide yarns obtained from such conventional techniques each have characteristics such as crimping characteristics, texture, and grade, and by utilizing these characteristics in combination, it is possible to design a variety of products. It is becoming possible. Especially, when POY false twisted textured yarn is used for the waist (welt) of the stocking and drawn yarn false twisted textured yarn is used for the leg (leg), the welt is rich in softness and the leg is soft. It is a rich product with extremely excellent feel and texture.
In addition, stretched yarn false twisted yarn is added to the stocking welt.
When POY false twisted yarn is used for the leg part, the welt part is rich in fitting property, the leg part is rich in softness and has no dyeing spots, and the product is extremely excellent in touch, feel and quality.

However, in the case of making a stocking by combining polyamide yarns having different spinning speeds in the production method, there is a problem that a hue difference / a shade difference (hereinafter referred to as a color difference) occurs due to a difference in yarn physical properties, particularly a dyeing property. It comes. For example, use only false-twisted drawn yarn or PO
Color difference does not occur when making a stocking by using only the yarn in which Y is drawn and false-twisted.
Color difference occurs when making stockings by combining POY with drawn false-twisted yarn.

Therefore, it has not been possible to achieve the disadvantage of color difference while keeping the advantages of the stocking made of polyamide yarns having different spinning speeds, which are excellent in touch, feel and quality, which cannot be achieved by the prior art.

<Object of the Invention> An object of the present invention is to provide a stocking having no color difference, which is composed of polyamide yarns having different spinning speeds.

<Specific Means for Solving Problems> In order to eliminate such a color difference, the present inventors have studied the relationship of the color difference with the fine structure of the polyamide yarn, particularly the fine structure of the amorphous region and the amount of amino terminal groups. Was examined. As a method of quantitatively evaluating the fine structure of the amorphous region, there is a method of using a mechanical loss tangent (tan δ) -temperature (T) curve. According to the method, the color difference and tan δ-T
As a result of extensive studies on the relationship of the curves, the ta of absorption (αa) that appears due to the Micro Brownian motion of the main chain
It was found that the nδ peak value (tanδmax) and its temperature position (Tmax) are very closely related to the occurrence of color difference. Furthermore, they have found that the amount of amino end groups is also related to the occurrence of color difference, and have completed the present invention. That is, the present invention is a stocking comprising a plurality of polyamide yarns that are spun at different spinning speeds, and the difference between the maximum spinning speed and the minimum spinning speed is at least 1000 m / min, and the viscoelastic properties of the polyamide yarn and The stocking is characterized in that the difference in the amount of amino end groups is in the range shown in the following formula.

(Tmax) max- (Tmax) min ≦ 6 (tanδmax) max- (tanδmax) min ≦ 0.03 (NH ₂ group) max- (NH ₂ group) min ≦ 5 where tanδmax and Tmax are in the dynamic viscoelasticity measurement. Mechanical loss tangent (tan δ) -temperature (T) curve αa absorption t
Peak value of anδ (tanδmax) and its temperature position [Tmax
(° C)], NH ₂ group is the amount of amino terminal group (milligram equivalent / k
g) () max and () min are maximum values,
Indicates the minimum value.

Here, the spinning speed means the speed of the first drive roll that draws the cooled and solidified yarn at a predetermined speed after further subjecting the yarn to the finishing treatment.

Nylon 6 or nylon 66 yarns are used in the stocking of the present invention, but these polyamides may contain matting agents, colorants, antistatic agents, stabilizers and the like. Moreover, the cross-sectional shape of the yarn is not limited to a circular shape, and may be a triangular shape, a T-shape, or any other irregular shape. In any case, when a plurality of polyamide yarns having a spinning speed difference of 1,000 m / min or more are combined to make a stocking, these yarns have a tanδmax difference of 0.03 or less, a Tmax difference of 6 ° C or less, and an amino The difference in the amount of end groups is 5 mg equivalent / kg
It is necessary that: When the stocking is made by combining yarns in which the difference in viscoelastic property or the difference in the amount of amino terminal groups exceeds the above range, a color difference occurs, which is not preferable.

In terms of eliminating the stocking color difference, tanδmax
A combination of yarns having a difference of 0.015 or less, a Tmax difference of 3 ° C. or less, and an amino terminal group amount difference of 3 mg / kg or less is more preferable.

Further, in order to leave the advantages of the feeling, feel and quality of the stockings made of polyamide yarns having different spinning speeds, at least one of the stockings of the present invention is constituted.
It is further preferred that the two polyamide yarns satisfy 95 ≦ Tmax ≦ 105 0.04 ≦ tanδmax ≦ 0.11 30 ≦ NH ₂ groups ≦ 45.

The polyamide yarn of the present invention can be obtained by appropriately setting the conditions in spinning, drawing, or bulking. For chips, the amount of amino end groups,
Further, by controlling the viscosity, by appropriately controlling the spinning temperature, the spinning speed, the heat treatment temperature, etc. during spinning, and by controlling the stretching and heat treatment temperatures during stretching, At the time of high processing, stretching, heat treatment temperature, processing method and device (for example, in the case of false twisting, the material of the disk
It can be obtained by controlling the shape).

The method of measuring the structural characteristics and other characteristics of the fiber used in the present invention will be described below.

[Mechanical loss tangent (tan δ)]

To measure the mechanical loss tangent, RH manufactured by Toyo Baldwin
EOVIBRON DDV-II-EA type is used. The tan δ-temperature (T) characteristic is measured in dry air with a measurement frequency of 110 Hz and a heating rate of 5 ° C./min. tan δ-temperature curve tan δ peak height tan
δmax and tanδ peak temperature Tmax (° C) are obtained.

[Amount of amino end group]

Dissolve 6 g of sample in 50 ml of 90% phenol aqueous solution, and add N / 20-
Measure with neutralization titration with hydrochloric acid.

〔Color difference〕

Using the yarn to make pante yeast packing, Nylosan Golden Yellow N4RL 0.14% owf, Nylosan Rubin N5BL (200%) 0.03% owf, Nylosan Blue NGFL (167%) 0.12owf, pH 6 with acetic acid and sodium acetate added, bath ratio Adjusted to 1:40, heated from room temperature to 80 ℃ for 120 minutes, kept at 80 ℃ for 60 minutes, dyed,
Taking out the pante yeast packing to obtain a dyed knitted fabric,
The color difference between the leg part and the toe part is visually judged.

<Effects of the Invention> The stocking of the present invention shows good quality with no color difference even though it is produced by combining polyamide yarns having different spinning speeds.

<Examples> Next, the present invention will be specifically described with reference to Examples.

Example 1 A sample of 8.4 wt% was dissolved in a formic acid solution having a relative viscosity (90%) having various amounts of amino end groups, and the nylon 66 of 40 was measured at a spinning temperature of 290 ° C. at a spinning temperature of 290 ° C. 0.46m
After melt-spinning from a spinneret with mφ and 10 holes and cooling and solidification,
After supplying the hydrous oil, it was wound at various spinning speeds, draw ratios and heat treatment temperatures. Then, this yarn is drawn at a draw ratio of 1.30,
Stretching false twisting was carried out using a urethane disk under the conditions of a temperature of 200 ° C and a twist number of 4,900 T / m to obtain a processed yarn of 30d / 10f.

On the other hand, nylon 66 with a relative viscosity of 40 has a diameter at a spinning temperature of 295 ° C.
It was melt-spun from a spinneret having a diameter of 0.32 mm and a number of holes of 5, cooled, solidified, and oiled, wound at a spinning speed of 800 m / min, and then stretched at a stretch ratio of 3.38. This drawn yarn has a draw ratio of 1.0
8. Twisting was carried out using a urethane disc under the conditions of temperature of 205 ° C and twist number of 6,800 T / m to obtain a finished yarn of 15d / 5f.

The production conditions of the textured yarn thus obtained, the microstructure characteristics,
The amount of amino end groups is shown in Table 1.

Table 2 shows the color difference occurrence status of the Pante yeast packing produced by combining these processed yarns.

In Table 2, the combination of No. 1 and No. 2 and 3 is the stocking of the present invention, and no color difference is observed. On the other hand, the combinations of No. 1 and Nos. 4 and 5 are stockings outside the scope of the present invention and cause a color difference, which is significantly inferior to the stockings of the present invention in this respect.

In addition, in all the combinations, the feeling and texture of the resulting stockings were excellent.

Example 2 Spinning conditions: spinning speed 3,600 m / min, draw ratio 1.30,
Heat treatment condition 200 ° C, and draw false twist condition, that is, draw ratio
Table 3 shows the microstructure characteristics of the processed color of 30d / 10f and the amount of amino end groups obtained under the same conditions as in Example 1 except for 1.15.

In addition, Table 4 shows the color difference occurrence state of the Pante yeast packing produced by combining these processed yarns with the No. 1 processed yarn of Example 1.

As is clear from Table 4, the combination of No. 1 and No. 6, 7 which is the stocking of the present invention does not show a color difference. In all combinations, the feeling and texture of the resulting stockings were excellent.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location D01F 6/60 331 7199-3B D04B 1/16 D06P 3/24 C 9356-4H

Claims (1)

[Claims] 1. A stocking comprising a plurality of polyamide yarns spun at different spinning speeds, the difference between the maximum spinning speed and the minimum spinning speed being at least 1000 m / min, the viscoelastic properties and amino of the polyamide yarn being used. A stocking having a difference in the amount of terminal groups within the range shown in the following formula. (Tmax) max- (Tmax) min ≦ 6 (tan δmax) max- (tan δmax) min ≦ 0.03 (NH ₂ group) max- (NH ₂ group) min ≦ 5 where tan δmax and Tmax are dynamic viscoelastic properties In the measurement,
Mechanical loss tangent (tan δ) -temperature (T) curve αa absorption tan δ peak value (tan δmax) and its temperature position [Tma
x (℃)], NH ₂ group is the amount of amino terminal group (milligram equivalent / k
g). () Max and () min indicate the maximum and minimum values, respectively.