JP3030316B2 - Processing of regenerated cellulose fiber products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a processing method in which the strength of a regenerated cellulosic fiber product is increased, the feeling is not hardened, the gloss and the dimensional stability are improved.

[0002]

2. Description of the Related Art Conventionally, so-called "silket processing" has been known as a means for obtaining a high-quality textile product by increasing the strength and improving the dimensional stability of a textile product mainly composed of cotton. I have.

[0003] In this processing method, a yarn or woven fabric mainly composed of cellulosic fibers is immersed in a high-concentration aqueous solution of caustic soda under tension, soaked, washed and neutralized.
It is widely used in the processing of cellulosic fiber products because it has effects such as improvement in strength and dyeability as well as improvement in gloss and dimensional stability.

[0004] However, when the above-mentioned "mercerizing" is applied to regenerated cellulosic fiber products, in ordinary "mercerizing", after a concentrated aqueous solution of caustic soda, washing with water or hot water is performed to remove the impregnated caustic soda. As a result, the concentration of the aqueous solution of caustic soda in the regenerated cellulosic fiber product gradually decreases from a high concentration to a low concentration.

However, the regenerated cellulose fiber is most easily dissolved by caustic soda when the aqueous solution of caustic soda is in the range of 5 to 15% by weight. In the above “mercerizing process”, when washing, since this concentration passes, the regenerated cellulose fiber dissolves and hardens, resulting in a decrease in strength and hand, resulting in loss of commercial value. Was. In particular, this obstacle was a serious problem in the treatment of a mixture of cotton and synthetic fibers.

[0006]

SUMMARY OF THE INVENTION The present invention focuses on the difficulty of alkali treatment of regenerated cellulosic fiber products for the reasons described above, and makes it possible to treat regenerated cellulosic fiber products with alkali. It is another object of the present invention to develop a method for positively improving the strength and gloss of regenerated cellulosic fibers.

[0007]

According to the present invention, a regenerated cellulosic fiber product is impregnated with a high-concentration aqueous solution of caustic soda,
Then, a gaseous compound capable of reacting with caustic soda is brought into contact with a gas to remove caustic soda in a short time.

By this means, when the concentration of the aqueous solution of caustic soda in which the regenerated cellulosic fiber is most easily dissolved by the caustic soda is in the range of 5 to 15% by weight, the caustic soda in the regenerated cellulosic fiber product is rapidly removed, and the dissolution and hardening are extremely high. Less results are obtained.

The regenerated cellulosic fiber products which are the object of the present invention include regenerated cellulose fiber products such as rayon and cupra, or these regenerated cellulose fibers,
Cellulose fibers such as cotton and hemp, polyester, polyamide, synthetic fibers such as polyacrylonitrile, and yarns obtained by blending or blending semi-synthetic fibers such as cellulose acetate, only these yarns, or woven fabrics containing these yarns as constituent components, Knitted fabrics and nonwoven fabrics containing the above fibers can be exemplified.

The concentration of the aqueous solution of caustic soda used in the treatment of the present invention is preferably from 15 to 40% by weight. If the concentration is too high, it becomes difficult to control the conditions, the viscosity increases, and the permeation into textiles deteriorates. When the concentration is too low, the treatment effect is reduced, and there is an obstacle that dissolution and gelation proceed to cause cutting and hardening.

In the treatment with an aqueous solution of caustic soda, a regenerated cellulosic fiber product is immersed in and permeated with an aqueous solution of caustic soda at about normal temperature to maintain a tensioned state. For example, in the case of yarn, a skein yarn is hung on a plurality of drums, and a tension is applied to the yarn by expanding the interval between the drums. In the case of a woven fabric, tension is applied in the length and width directions by using a tenter. There are means. Although the treatment temperature is around room temperature, it is preferably slightly lower, that is, 10 ° C to 20 ° C.

At the time of this treatment, a penetrant, a fluorescent agent, a bluing agent and the like may be added to the treatment liquid as required.
The processing time is preferably several seconds to several minutes.

The removal treatment performed after the caustic soda treatment is performed by applying a gaseous compound to the textile. Examples of the gaseous compound for performing the removal include a carbon dioxide gas, a hydrogen chloride gas, a sulfur dioxide gas, and a sulfur dioxide gas. However, those which are easy and effective to handle are preferably carbon dioxide gas and hydrogen chloride gas.

[0014] The treatment method is, for example, spraying a gas for removal treatment on the regenerated cellulosic fiber product impregnated with caustic soda, or treating the regenerated cellulosic fiber product by passing the cellulosic fiber product into a gas-filled processing chamber. There are means of.
The treatment is usually performed at around normal temperature until caustic soda is substantially eliminated.

After the treatment, washing with water is performed to remove compounds, various additives and the like formed and adhered on the regenerated cellulose fiber product. After washing with water and drying, the desired product can be obtained.

Next, the present invention will be described in more detail by way of examples. Various data in the examples were measured by the following methods. Yarn tensile strength and elongation JIS L1095 General spinning test method 7.5 Based on the term of single yarn tensile strength and elongation. Barium activity number of yarn JIS L1095 General spinning test method 7.32 According to barium activity number section. Yarn glossiness Jeffries method. Tensile strength of woven fabric JIS L1096 General woven fabric test method 6.12 Tensile strength and elongation The term B method (strip method). Tear strength of woven fabric JIS L1096 General woven fabric test method 6.15 The tear strength is determined by the method D (Pendulum method). Wrinkle resistance of woven fabric JIS L1059 Test method of wrinkle resistance of woven fabric According to method B (Monsanto method). Barium activity number of fabric JIS L1096 General fabric test method 6.41 According to the barium activity number section.

Example 1 A rayon skein yarn having a yarn count of 60/2 was wrapped around two rolls, immersed in a 23% by weight aqueous solution of caustic soda for 30 seconds, and the interval between the two rolls was changed to the original length. After maintaining the temperature for 1 minute in a room at 25 ° C., the carbon dioxide gas was supplied at a rate of 25 liters / minute for 2 minutes.
The skein yarn was sprayed for a minute, and then washed and dried.

For comparison, in the above embodiment, 2
After being immersed in a 3% by weight aqueous sodium hydroxide solution for 30 seconds, the interval between the two rolls was maintained for 1 minute in a room at 25 ° C. while maintaining the original length, and then washed with hot water at 80 ° C. for 1 minute. Thereafter, the skein yarn was washed with water and dried. (Comparative example)

Among the obtained yarns, in the method shown in the comparative example, the fiber was dissolved, the state of the yarn could not be maintained, and the measurement of the following yarn characteristics was impossible. However, in the method shown in the examples, The results in Table 1 below were obtained.

[Table 1]

As is apparent from the above results, in the comparative example, that is, in the conventional method, the mercerizing of regenerated cellulose was impossible due to the dissolution of the fibers and the processing was impossible. It can be seen that excellent results can be obtained.

[Embodiment 2] Yokomo is also 40th,
After scouring 110 lines and 75 lines of rayon broad cloth per 2.54 cm in density, dipped in a 23.5% by weight aqueous sodium hydroxide solution for 10 seconds, squeezed to a squeezing ratio of 100%, and squeezed with a tenter. The cloth was treated for 50 seconds while applying tension so as to maintain the original width in the width direction by elongating 1%. Subsequently, hydrogen chloride gas was sprayed onto the cloth in an amount of 15 liters per minute, followed by washing with water and drying.

For comparison, in the above embodiment, after immersion in an aqueous solution of caustic soda and a tenter treatment, hot water was continuously poured at 60 ° C., followed by rinsing with water, neutralized with a 0.3% dilute sulfuric acid aqueous solution, and washed with water. Dried. (Comparative example)

In the obtained cloth, the method shown in the comparative example dissolves the fiber, so that it was difficult to process the cloth, a normal cloth could not be obtained, and the characteristics could not be measured. The results in Table 2 below were obtained.

[Table 2]

As is clear from the above results, the comparative example, that is, the conventional method does not allow the mercerizing of the regenerated cellulose fiber fabric, whereas the present invention allows the alkali treatment, and furthermore, the gloss and the strength. Is excellent.

[0025]

As is clear from the above description and the results of the respective examples, the regenerated cellulose fiber product could not be processed by the conventional “mercerizing”, whereas the regenerated cellulose fiber product was produced by the method of the present invention. Not only the alkali treatment of the base fiber product has become possible, but also the treated product has an epoch-making effect of improving gloss, dyeability and strength.

Claims (3)

(57) [Claims] 1. A regenerated cellulosic fiber product comprising 15 to 40
A method for processing a regenerated cellulosic fiber product, comprising impregnating with a weight percent aqueous solution of caustic soda, then contacting the gas with a gaseous compound capable of reacting with caustic soda to remove caustic soda in a short time. 2. The method for processing a regenerated cellulosic fiber product according to claim 1, wherein the regenerated cellulosic fiber product is a fiber product containing rayon or cupra fiber. 3. A gaseous compound carbon dioxide gas, the processing method of regenerated cellulose fiber products according to claim 1 or 2, wherein the hydrogen chloride gas or sulfur dioxide gas.