JP2929363B2 - Processing of cellulosic 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 high quality textile product which has enhanced strength, improved dimensional stability, improved dyeability, and improved dyeing properties of textile products mainly composed of cellulosic fibers, especially cotton. The purpose is to:

[0002]

2. Description of the Related Art As a means for improving the dimensional stability of textile products mainly composed of cotton, so-called "mercer processing" has been known. This processing method is a method of immersing a cotton-based yarn, woven fabric, etc. in a high-concentration aqueous solution of caustic soda under tension, permeating, washing, and neutralizing, and not only improving the dimensional stability. It has the effects of improving the strength and the dyeability, and is widely used in the processing of cellulosic fiber products.

[0003] The effect of the above-mentioned "merchantizing" is attributed to the fact that the cellulosic fiber changes into a crystal structure usually called "cellulose 2" by the alkali treatment. In order to change the cellulosic fiber to the “cellulose 2” structure, it takes time to wash with water or hot water and neutralize with an aqueous acid solution, and often returns to the original “cellulose 1” structure. The effect of "merchantizing" was to decline.

[0004]

The inventor of the present invention has found that the cause of the decrease in the effect of "merchantizing" is that after alkali treatment, washing with water,
Since the alkali concentration in the cellulosic fiber gradually decreases during the neutralization stage, the “alkali cellulose” produced by the alkali treatment often returns to “cellulose 1” without causing a structural change to “cellulose 2”. The present inventors have arrived at the present invention by assuming that if the alkaline substance once absorbed by the fibers can be removed in a short time, a large amount of the "cellulose 2" structure can be maintained.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a high-concentration aqueous solution of caustic soda is impregnated into a cellulosic textile and then reacted with a gaseous compound which reacts with caustic soda to reduce the alkali in the textile in a short time. It is to be removed.

[0006] By adopting the measures of the present invention, the cellulosic fibers are turned into "alkali cellulose" by the action of caustic soda, and then the caustic soda is rapidly removed and does not pass through a relatively low concentration alkaline state. It is considered that the number of structures increases, and the strength, dimensional stability, dyeability, and the like of the cellulosic fiber can be improved.

The cellulosic fiber products to which the present invention is applied include cellulose fibers such as cotton and hemp, or synthetic fibers such as polyester, polyamide and polyacrylonitrile containing these cellulose fibers, and semi-synthetic fibers such as cellulose acetate. Or mixed yarns, only these yarns, or woven fabrics, knits,
Nonwoven fabrics and the like can be mentioned.

The concentration of the aqueous solution of caustic soda used in the treatment of the present invention is 10 to 40% by weight, particularly preferably 15 to 25%.
A weight percent aqueous solution is used. If the concentration is too high, it is difficult to control the conditions, and the viscosity tends to increase, so that penetration into the fiber product tends to be poor. If the concentration is too low, the processing effect is reduced.

In the caustic soda treatment, a cellulosic fiber product is immersed in a caustic soda aqueous solution at about normal temperature and penetrated to maintain a tension state. For example, in the case of yarn, a wrapped yarn is wound on two drums, and a tension is applied to the yarn by increasing 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 to hang.

In 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.

[0012] The treatment method is a method such as spraying a gas for performing a removal treatment on a cellulosic fiber product impregnated with caustic soda, or passing the cellulosic fiber product through a treatment chamber filled with gas to treat the cellulosic fiber product. There is. The processing conditions are usually performed at around normal temperature until the caustic soda disappears.

After the treatment, water washing is carried out to remove compounds, various additives and the like formed and adhered on the cellulosic 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 single yarn tensile strength and elongation section 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 The tensile strength and elongation are measured by the term B method (strip method). Tear strength of woven fabric JIS L1096 General woven fabric test method 6.15 Term of tear strength Measured by 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.

Embodiment 1 A yarn count of 69/2 is wrapped over two drums and immersed in a 23% by weight aqueous solution of caustic soda for 30 seconds. Then, the interval between the two drums is increased by 2% in the air, and the room temperature is set at 25 ° C. After applying a tension for 1 minute, a carbon dioxide gas was sprayed at a rate of 25 liters per minute for 30 seconds, followed by washing with water and drying.

For comparison, the skein yarn impregnated with caustic soda and tensioned in the above embodiment was washed with hot water at 80 ° C. for 1 minute, and then neutralized with a 0.3% dilute sulfuric acid solution for 1 minute. After that, washing and drying were performed (Comparative Example).

The properties of the obtained yarn are as shown in Table 1 below.

[Table 1]

As is apparent from the above results, according to the present invention, the strength is higher than that of the comparative example, that is, the conventional method, the barium activity number, that is, the effect of the mercerizing is high, and the glossiness is excellent.

Embodiment 2 FIG. Yoko is also 40th,
Refine 110 cotton, 75 wide cotton cloths with a density of 2.54 centimeters, and 23.5% by weight after bleaching
Immersed in caustic soda for 10 seconds, squeezed with a mangle to a squeezing ratio of 100% of the liquid weight, stretched 1% in the vertical direction, hanged on a tenter, and tensioned to maintain the original width in the width direction. , And then guided to a chamber filled with hydrogen chloride gas, treated for 1 minute, washed with water, and dried.

For comparison, in the above embodiment, caustic soda was impregnated and passed through a tenter while applying a drawing tension. , 0.3%
, Neutralized with a dilute aqueous sulfuric acid solution, washed again with water and dried.

The properties of the obtained fabric are as shown in Table 2 below.

[Table 2]

As is apparent from the above results, according to the present invention, the strength is higher, the degree of anti-wrinkling (particularly, wetness) is higher, and the barium activity number is higher than the comparative example, that is, the conventional method.

[0023]

As is clear from the above description and the results of the examples, the fiber product processed by the method of the present invention has higher strength and superior gloss as compared with the product manufactured by the conventional "merchant processing". It can be seen that the wrinkle resistance is excellent and the barium activity number, that is, the absorbability of dyes and the like is remarkably improved.

Claims (1)

(57) [Claims] 1. A cellulosic fiber product is impregnated with a high-concentration aqueous solution of caustic soda to maintain a state of tension, and then a gaseous compound capable of reacting with caustic soda is sprayed, or
Or a cellulosic fiber product in a processing chamber filled with gas.
A method for processing cellulosic fiber products, comprising removing caustic soda until the caustic soda is substantially eliminated by passing through .