JPS58115173A - Production of transparent fabric - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a four-wall knitted fabric made of polyester Il fibers, and the object thereof is to produce a four-wall knit fabric having excellent dimensional stability, shape stability, appearance, and characteristic texture. There is a cane that offers knitted fabrics.

Traditionally, striped legs are used to create so-called sky feathers that have a watermark pattern in a lattice pattern.

It has been known for a long time to be made using methods such as blank punching in the weaving process. However, during weaving, some of the threads move from the dormer part to the empty part during weaving, and for this reason, when using *ttc fine denier or fine count yarn, the actual part and the empty part move. The boundaries between the parts become blurred, making it almost impossible to produce a clear watermark pattern.9. In order to solve these drawbacks, a method is known in which a gray fabric made by interweaving fiber threads made of a water-soluble resin such as polyvinyl alcohol is dissolved and removed in a process such as scouring. Although this method prevents the yarn from moving during the weaving process, it easily dissolves during the scouring process, and has the same disadvantages as the above-mentioned method.

Particularly when trying to introduce patterns to highly twisted grained fabrics, which are one of the popular products in recent years, the violent movement of the twisted threads during the scouring and relaxing process is very attractive, creating a clear watermark pattern with an excellent appearance. It is completely impossible to make any appearance, and it has drawbacks such as poor stability and poor appearance. For this reason, water-insoluble and alkali-soluble modified polyesters, such as ethylene terephthalate polyesters copolymerized with a small amount of 5-sodium sulfoisophthalic acid, polyoxyethylene glycol/
Some attempts have been made to use fibers such as polyethylene terephthalate blended with organic sulfonates; however, the alkali solubility tends to decrease and fluctuate depending on the heat treatment conditions before scouring or melting treatment, and therefore the fibers are strengthened during melting treatment. When trying to dissolve and remove the modified polyester under certain conditions, the polyethylene terephthalate fibers on one side are also greatly reduced, making it easy to slip during subsequent processes and wearing, making it difficult to obtain a clear watermark pattern with an excellent appearance. have.

The inventors of the present invention have conducted extensive research to produce a watermarked fabric free of the above-mentioned drawbacks, and as a result have arrived at the method of the present invention. That is,
The present invention heat-treats a cross-knit woven fabric of a polyalkylene terephthalate-based polyester fiber yarn (A) and a modified polyester fiber yarn (B) whose alkali weight loss rate is at least 5 times that of the polyester fiber yarn CI'k). The alkali weight loss rate of the polyester fiber yarn (A) does not increase or decreases compared to the previous one, while the modified polyester fiber yarn (A)
In the l fiber (B), under conditions where it increases by at least 10%, ll! After the 11 treatment, the modified polyester fiber thread is dissolved and removed by alkali treatment.

When using the method of the present invention, polyester fiber yarn (A)
It is sufficiently set and exhibits excellent shape exposure stability, giving a firm and flexible texture, and the weight loss rate of the polyester fiber yarn (A) is reduced by making the Kf-based polyester fiber yarn (B) more easily soluble. As a result, a rip-free watermark fabric with excellent strength and appearance can be obtained. Also, by using highly twisted yarn, you can obtain a uniform grain effect. In the method of using soluble vinylon as the yarn to be dissolved and removed, sizing cannot be performed due to its water solubility, and the twisted yarn cannot be untwisted by heat after medium twisting, which tends to cause weaving. However, the present invention has the advantage that all such problems are solved and a product with extremely high commercial value can be provided at a low cost.

The polyalkylene terephthalate-based polyester*fiber (A) used in the present invention is as follows.

Copolymerization of polyethylene terephthalate, polybutylene terephthalate, and the copolymerization component of the polyester K10 or less (however, the copolymerization component does not introduce acid groups into the side chains of the polyester produced). Examples include fiber yarns such as. The fiber yarn may be treated with an alkali resistance imparting agent such as a water-repellent finishing agent, a water-repellent finishing agent, and a Mehumin 1ilQ1 finishing agent. The polyester constituting the polyester fiber yarn (A) usually has a melting point of 245°C or higher, and a crystallization rate (according to crystallization when heated at a temperature increase rate of 5°C/min using a differential thermal analyzer). The temperature at which an exothermic peak appears) is preferably less than 135'C.

On the other hand, the modified polyester fiber yarn (B) has an alkali weight loss rate that is 5 times or more higher than that of the polyester fiber yarn (A). In addition to 1 to 3.5 moles of the above-mentioned copolymer components, fiber threads made of copolymerized ethylene terephthalate polyester are particularly preferred. Modified by copolymerizing ethylene glycol, dipropylene glycol, neopentyl glycol alkylene oxide adduct (addition mole 1 to 10), etc. to the acid component and/l or glycol component by copolymerizing 15 molar or less, and furthermore 2 to 15 molar. After manufacturing the polyester or the above-mentioned modified polyester, the modified polyester (copolymerized with components other than ethylene terephthalate) is blended and/or copolymerized with polyalkylene glycols for about 0.5 to 5 seconds at any stage during the polymerization process of the modified polyester. The polymerization ratio is preferably 20% by weight or less. The modified polyester constituting the fiber yarn (B) usually has a melting point of 220 to 245°C and a crystallization temperature of 135°C.
It is preferable that it is -170 degreeC. As a specific example of a particularly preferred modified polyester, 5 to 15 moles of isophthalic acid and 1 to 3.5 moles of 5-sodium sulfoisophthalic acid are copolymerized to form a next ethylene terephthalate polyester, all glycol components. On the other hand, neopentyl glycol tfF is its ethylene oxide adduct (
5-sodium sulfoisophthalic acid (1 to 8 moles) 1 to 15 moles and 1 to 3 moles of 5-sodium sulfoisophthalic acid to the total acid component.
．． It is a 5 mole copolymerized ethene terephthalate polyester.

In the present invention, a cross-knitted woven fabric is produced by mixing the above-mentioned polyester fiber yarn (A) and modified polyester fiber yarn (B) in an appropriate ratio. An example of a mixed shape is one in which fiber threads (B) are arranged at appropriate intervals in either or both of the warp and weft directions.

The alkali weight loss rate of such a mixed-knitted fabric does not increase or decreases qualitatively in the polyester fiber yarn (A) compared to before heat treatment, and is preferably at least 10 or more in the universally modified polyester iron yarn (B). After heat treatment under conditions of increasing the temperature by 20 times or more, alkali treatment is performed. Such heat treatment can be applied to the types of fiber yarns (A) and (B), I11! This is achieved by appropriate settings such as the temperature of the processing area, cooling conditions during heat treatment, and tension/relaxation conditions. The heat treatment humidity is higher than the crystallization humidity of the fiber yarn (B) 1 Usually at 150 to 210°C for about 10 seconds to 10 minutes, preferably at 170 to 200°C, 1
After 6 heat treatments performed for 0 to 120 seconds, the fiber yarn (B) is rapidly cooled to a temperature below the crystallization temperature. It is preferable that the tension state of the fabric during heat treatment is maintained at least at a constant length of the fabric,
Furthermore, a tensioned state with a large extension ratio and/or a small overfeed ratio is particularly preferable. By such heat treatment, the molecular orientation of the fiber yarn ('B) is disturbed and crystallization is suppressed, resulting in an alkali weight loss rate (30 f/J caustic soda aqueous solution).

Bath ratio 1: 100 (processed at 100°C for 60 minutes) can be greatly increased, and in some cases can be increased by more than 10 times. Therefore, when the fiber yarn (B) of the same denier is completely dissolved, the weight loss of the fiber yarn (A) is 20 cycles or less at most. Note that a scouring step and a grinding step may be added before or after the S+ treatment. It is believed that in the heat treatment of the present invention, the molecular orientation of the specific modified polyester fiber yarn (B) is partially disturbed and rearranged by the heat treatment, and the rapid cooling suppresses crystallization and increases the alkali weight loss rate. Therefore, when the crystallization temperature of the fiber yarn CB) deviates from the above range, crystallization is promoted! 19 may contain a delay additive as appropriate.

Further, when the single yarn denier of the fiber yarn (B) is reduced, the alkali solubility of the fiber yarn (B) can be promoted by treatment with heptiron ammonium, phosphoric acid, etc. It is possible to partially perform acid treatment and dissolve and remove the fiber yarn CB) with alkali, or it is also possible to partially perform alkali treatment.

The conditions for the alkali treatment may be those normally employed for alkali weight loss processing of polyethylene terephthalate fiber fabrics. In addition, the fiber yarn (A) and the /Makuha fiber yarn (B) are products twisted with other alkali-resistant fibers.

It may also be a mixed fiber product.

The present invention will be explained below with reference to Examples. In addition.

- in the examples is based on weight.

Example 1゜The warp was polyethylene terephthalate (crystallization temperature 125°C), semi-dal round cross section 50 dn 4B set in a grinding medium.
After twisting the F yarns S and Z2500T/M, the twisting was set at 85°C for 40 seconds, and the round yarn (A) J- was mixed with 10 mol of isophthalic acid component and 1.5 mol of 5-sodium sulfoisophthalic acid based on the total acid component. Polymerized ethylene terephthalate polyester (melting point 232°C, crystallization temperature 145°C)
5800T/48F yarn with cross section 50d/48F after stretching
After M-twisting, 822 yarns (A) were alternately arranged, and the yarns (B) were set at 70° C. for 40 seconds to prevent twisting, and the yarns (B) were warped and beamed in a random arrangement.

On the other hand, polyethylene terephthalate (yarn (A
) Semi-dual round cross section 5 with stretching set of the same polymer as )
After twisting 0d/48F yarn to 52500T/M, it was twisted at 85℃ for 40
The density (220 pieces x 8
8 strands/inch).

After drying the obtained greige cloth in a vertical V palm shape, it is kept at a fixed length for 18 minutes.
Heat treatment was performed at 0°C for 30 seconds, and immediately quenched with cold air to 140°C or lower. Then, it was boiled for 60 minutes in a 60 f/I caustic soda aqueous solution at a bath ratio of 1:100 (12% weight loss for Kenjin and C), washed with water, and dried.

Printing, finishing set and nine. As a result, a sky-feather striped zit-jet willow having uniform grains with excellent appearance and clear feathers with excellent slip resistance was obtained. Alkali weight loss rate of yarns (A) and (B) before and after heat treatment (30t/
J NaOH aqueous solution, bath ratio 1 + 100.100℃6
0 minute treatment) is shown in Table-IK.

Table 1 In the present invention, the yarn (B) with a large alkali weight loss rate further increases its alkali weight loss rate by heat treatment.

Competitive weight loss with yarn (A) in the same bath further accelerates weight loss, reduces the weight loss rate of yarn (A), and effectively removes yarn (B). The thread (A) also has the advantage of being sufficiently set to provide a firm and soft texture with stabilized grain.

Example 2゜ The yarn (A) of Example 1 was warped and beamed as a warp yarn.

On the other hand, as a weft, semi-dull round cross section 50d/48F yarn made of the same polyester as yarn (A) was twisted with 225007/M yarn and then set at 85°C for 40 seconds to form a round yarn (A, 9I! Yarn CB in Example 1). The yarn was woven in a random arrangement, and then subjected to KV embedding drying heat treatment as in Example 1, cooling, weight loss processing (loss rate of yarn A and yarn A: 13%), dyeing, and finishing setting. As a result, a horizontally striped georgette with clear weft and sky feathers was obtained, and the appearance and texture were excellent. 22 threads (A) were arranged alternately, and threads (B) were arranged randomly for warp beaming.

- Ten thousand, the yarn in Example 2 as the weft (A and Example 1)
The yarn (B) was woven in a random arrangement and then treated in the same manner as in Example 1. As a result, a willow georgette with clear feather check and excellent appearance and texture was obtained.

Example 4゜Total acid component KNu,
Ethylene terephthalate copolymer polyester (melting point 240°C, Crystallization humidity: 155°C) S 800 T/
After M-twisting, weaving and treatment were carried out in the same manner as in Example 1, except that the yarn (D) was set at 70° C. for 40 seconds to prevent twisting.

As a result, the thread (A) is 6'! A striped georgette with clear feathers and excellent slip resistance, appearance, and feel was obtained by reducing the weight by only 4%.

Incidentally, Table 2 shows the alkali weight loss rates of yarn (A) and yarn (D) before and after KFI+ treatment.

Table 2 Patent applicant: Toyobo Co., Ltd.

Claims (1)

[Claims] 1゜ Polyalkylene terephthalate polyester I
A cross-knitted fabric of Il pongee yarn (A) and a modified poly'ester iron embroidery yarn CB) having an alkali weight loss rate of at least 5 times that of the Boreester IIIIl yarn (A) is prepared by IlI! I
After heat treatment under conditions in which the alkali weight loss rate does not significantly increase or decreases in polyester pongee yarn (B), while it increases by at least 10% in modified polyester fiber pongee yarn (B) with respect to treatment #1, A method for producing a watermark woven or knitted material, which comprises dissolving and removing modified polyester rutted pongee yarn through alkali treatment. 2. Ethylene terephthalate copolymerization in which the modified polyester fiber yarn (B) is copolymerized with 5 to 15 moles of an isophthalic acid component and 1 to 3.5 moles of a metal salt sulfonate group-containing dicarboxylic acid component based on the total acid component. Polyester I
2. A method for producing a watermark woven or knitted fabric according to claim 1, wherein the fabric is made of l fiber. 3. Treat with acid in any step before applying alkaline soap. 2. The method for producing a watermark woven or knitted material according to claim 1, wherein the modified polyester fiber yarn is then dissolved and removed by alkali treatment.