JPH06330480A - Method for carrying out color-dropping processing of fiber fabric - Google Patents

Abstract

PURPOSE:To provide color dropping effect excellent in washing-out effect by treating a fabric consisting of a previously dyed polyester fiber and a cellulose- based fiber with an alkali. CONSTITUTION:A dyed material obtained by previously dyeing ester side of a woven or knitted fabric or a nonwoven fabric consisting of a polyester-based fiber and a cellulose-based fiber using disperse dye and cellulose side thereof using direct dye, reactive dye, vat dye, etc., is subjected to reduction treatment with a batch type exhaustion method to provide color-dropping effect excellent in washing-out-like worn-out effect to the fabric.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing method for imparting a discoloration effect such as a washing effect to a dyed cloth.

[0002]

2. Description of the Related Art A method of applying a stone material and a cloth to a washer and using the abrasion effect of the cloth by the stone material is a method of applying a stone cloth and a cloth to a washed, worn, and faded soft texture. The bleaching method and the chemical processing method, which utilize the decolorizing effect of sodium hypochlorite, and the bioprocessing method using the fibrinolytic enzyme cellulase.

However, these methods are mainly processed in a product form and have a limited processing capacity, and it is desired to develop a processing method capable of obtaining a washing effect by a simpler method. It was

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and provides a processing method for imparting a discoloration effect such as a wash-tone to a dyed cloth by a simple method. That is the purpose.

[0005]

SUMMARY OF THE INVENTION The present invention achieves the above object and has the following configuration. That is, the gist of the present invention is a method of discoloring a textile fabric, which comprises subjecting a pre-dyed textile made of polyester fibers and cellulosic fibers to an alkali treatment.

The present invention will be described in detail below.

In the present invention, a pre-dyed fiber cloth composed of polyester fibers and cellulosic fibers is used as the cloth to be processed. Examples of the fiber cloth here include woven fabrics, knitted fabrics, and mixed woven fabrics made of a mixed yarn of polyester fibers and cellulosic fibers such as cotton and hemp.

As the dyeing method applied to the fiber cloth in advance, any dyeing method such as yarn dyeing, anti-dying, and textile printing may be used. The dye used is polyester fiber,
In the case of disperse dyes and cellulosic fibers, direct dyes, reactive dyes and vat dyes are preferably used.

The fiber cloth prepared as described above,
In the method of the present invention, alkali treatment is performed. The alkali treatment referred to here is a treatment corresponding to alkali weight loss from the viewpoint of polyester fiber.

The chemicals used for the alkali treatment include
Examples thereof include sodium hydroxide and potassium hydroxide. The amount of alkali used may be adjusted depending on the degree of color fading effect required for the pre-dyed fiber cloth,
Using the weight loss rate of polyester fiber as a numerical index,
With a weight loss rate of about 25%, a discoloring effect having a preferable wash-wash feeling can be obtained.

As the alkali treatment method, there are a batch type exhaustion method and a continuous method, and either method may be applied. In the exhaust method, using a jet dyeing machine, a bath ratio of 1:20 to 1:30,
The amount of alkali used is appropriately determined so as to achieve the target weight loss rate by performing the treatment at a temperature of 95 to 100 ° C. for about 40 minutes. In the case of the continuous method, after applying an alkaline aqueous solution, steaming is performed with a continuous steamer. Also in this case, the processing conditions are appropriately set so that the weight loss rate of the polyester fiber is 10 to 25%.

The alkali-treated fiber cloth is immediately washed with water to remove sodium hydroxide and the reduced polyester component on the cloth, neutralized, washed with water and dried.

The present invention has the above configuration.

[0014]

[Operation] When a pre-dyed fabric consisting of polyester fibers and cellulosic fibers is subjected to alkali treatment, the disperse dyes on the polyester fiber side are resistant to alkali, whereas the Since dyes, reactive dyes, vat dyes, etc. have poor durability, dye decomposition occurs, and as a result, an interesting discoloration effect having a wash-wash effect can be obtained due to the difference in the degree of alkali treatment. In terms of texture, regarding polyester / cotton blended fabrics, the polyester fibers are hydrolyzed and reduced in weight by the alkali treatment, and the cotton is subjected to the hot mercerizing effect. The drape property will be improved.

[0015]

EXAMPLES Next, the present invention will be described in more detail by way of examples. The performance of fabrics in the examples was evaluated by the following method. (1) Color fading effect ◎: High ○: Normal △: Low (2) Feeling ◎: Soft ○: Normal △: Coarse hard

Example 1 A textured 2/2 twill machine using a blended yarn of 70% polyester / 30% cotton 50s /-(126 warps / inch, 90 wefts / weft)
Sake) is prepared, desizing and scouring are applied by the usual method, and then the polyester side is 1
It was dyed by the exhaust method at 30 ° C. for 60 minutes, and then, the cotton side was dyed by the following method 2 at 50 ° C. for 60 minutes by the exhaust method. Prescription 1 Dianix Red BN-SE 0.13% owE (manufactured by Mitsubishi Kasei Co., Ltd., disperse dye) Dianix Blue BG-FS 1.4% owE Disper TL 1.0 g / liter (Maruhishi Yuka Co., Ltd., level dyeing) Agent) pH = 5.0 [% owE means% by weight of polyester fiber] Prescription 2 Diamira Blue 3R 2.6% owC (manufactured by Mitsubishi Kasei Co., Ltd., reactive dye) Diamira Brill. Blue R 6.5% owC Glauber's salt 50.0 g / liter Soda ash 10.0 g / liter [however,% owC Means% by weight of cotton fiber. ]

The dyed fabric obtained as described above is immersed in an aqueous solution of 50 g / liter of sodium hydroxide (flakes) at a bath ratio of 1:30, treated at 95 ° C. for 40 minutes, washed with water, neutralized, After washing with water, weight loss rate to polyester is 18.5%
The processed cloth of the present invention was obtained.

For comparison with the present invention, a dyed fabric dyed in the same manner was put in a rubber meter together with 20 steel balls, water was added, and the mixture was stirred for 30 minutes to give a stone-washed treatment, which was used for comparison. Work cloth (comparative example)
Got

The performances of the present invention and the comparative work cloth were evaluated, and the results are shown in Table 1.

[Table 1]

As is clear from Table 1, the cloth obtained by the method of the present invention had good discoloration and soft texture comparable to the cloth of the comparative example by the conventional method.

[0021]

EFFECTS OF THE INVENTION According to the method of the present invention, fading effect such as washed-out effect and worn-out effect can be imparted to a pre-dyed cloth composed of polyester fiber and cellulosic fiber.

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Claims (1)

[Claims] 1. A method of discoloring a textile fabric, which comprises subjecting a pre-dyed textile made of polyester fibers and cellulosic fibers to an alkali treatment.