JPH06346375A - Modification of cellulosic fiber cloth - Google Patents

Abstract

PURPOSE:To soften cellulose fibers without reduction in strength by treating only the surface of a celluosic fiber cloth with cellulase. CONSTITUTION:After a cellulolytic enzyme such as cellulase is applied to only the surface of a cellulosic fiber cloth with a kiss-roll coater or the like, the cellulolytic reaction is carried out at a low temperature to effect modification into increased flexibility or softness and low in reduction in tenacity such as tear strength. When the cloth is double-woven or double-knitted, only one side surface is modified to give a fabric which has a peculiar effect such that the fabric touches are quite different between the front and the back layers.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for modifying a cellulose fiber cloth.

[0002]

2. Description of the Related Art Conventionally, there have been various methods for modifying a cellulose fiber cloth using a cellulolytic enzyme, and they have been developed as a processing method for weight reduction and softening. However, the fiber cloth has a drawback that its strength is remarkably reduced when it is processed by using a cellulolytic enzyme. Therefore, if the processing conditions are weakened in order to suppress the strength reduction as much as possible, the modification effect becomes insufficient.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a method for modifying and processing a cellulose fiber cloth using a cellulolytic enzyme and suppressing a decrease in strength. The purpose is.

[0004]

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 for modifying a cellulose fiber cloth, which comprises treating only the surface of the cellulose fiber cloth with a cellulolytic enzyme.

The present invention will be described in detail below.

The term "cellulosic fiber cloth" as used in the present invention means a woven fabric, a knitted fabric, a non-woven fabric made of cellulosic fibers such as cotton, hemp, and viscose rayon, or a mixed spun yarn or a mixed fiber yarn in which two or more of these fibers are used in combination. Means woven fabric, knitted fabric, etc.

In the present invention, only the surface of the above cellulose fiber cloth is treated with a cellulolytic enzyme. The surface referred to here means the surface on one side or both sides of the fabric. Examples of the cellulolytic enzyme used in the present invention include cellulase-based enzymes, microbial cellulase and complexes thereof.

In the present invention, only the surface of the cellulose fiber cloth is treated with a cellulolytic enzyme. The step of this enzyme treatment is carried out after a pretreatment step such as desizing, scouring, bleaching, etc. The other finishing processes may be performed in any order with the enzyme treatment process.

In order to apply the cellulolytic enzyme only to the surface of the cloth, an apparatus capable of applying the processing only to the surface of the cloth, such as a low-applying processing apparatus or a coating processing machine, may be used. Examples of devices corresponding to these include a kiss roll type applicator, a gravure roll type applicator, and a reverse roll type applicator.

Using the above-mentioned apparatus, an enzyme (containing 1 to 5% in the treatment liquid) is preferably applied to the dried cloth in an amount of 5 to 10% (cloth weight ratio), and the temperature is about 40 ° C. by the cold batch method. Then, the fibrin decomposition reaction is allowed to proceed for about 5 to 15 hours. After a certain reaction time, the fabric is washed and dried.

The present invention has the above configuration.

[0012]

[Operation] Generally, in the treatment with cellulolytic enzymes, the purpose is to obtain the effect of modifying the texture by breaking the bonds of the cellulose molecular chains in the fiber. When the fabric is dipped in a chemical containing the agent to be processed, the enzyme acts on all the cellulose fibers in the fabric, and when it is tried to obtain the modifying effect, the strength is remarkably reduced.

As in the present invention, when a cellulose-degrading enzyme is applied to only the surface of the cloth for modification, the area other than the surface is not affected by the enzyme. Therefore, it is possible to suppress the remarkable decrease in strength. Further, in the case of a woven fabric or a knitted fabric having a double structure, a woven or knitted fabric having a special effect in which the textures of the front and the back are completely different can be obtained by modifying only one surface.

[0014]

EXAMPLES Next, the present invention will be described in more detail with reference to Examples. Measurement and evaluation of the performance of the fabrics in Examples were carried out by the following methods. (1) Tear strength JIS L-1096 (Pendulum method) (2) Bending flexibility JIS L-1096 (Handle ometer method), Slit width 1.5 cm

Example 1 A twill fabric made of 100% cotton after being exposed (weight per unit area: 150 g / m ² ).
Is prepared and a treatment liquid of the following prescription 1 (viscosity 130 cp) is prepared
Was applied to only one surface of the cloth with a kiss coat type applicator at a liquid absorption rate of 10% (fabric weight ratio).

Prescription 1 Cell Crust 1.5 L 30 g / liter (Novo Nordisk Bioindustry Co., Ltd.,
Cellulase) Acetic acid (99%) 1.0 g / liter Sodium acetate (trihydrate) 2.0 g / liter

Subsequently, the beam was continuously wound around the beam in a spread form and reacted in a cold batch at 45 ° C. for 8 hours. After completion of the reaction, the cloth was washed with hot water at 80 ° C. and dried to obtain a work cloth according to the method of the present invention.

Example 2 A processed cloth according to the method of the present invention was obtained in the same manner as in Example 1 except that the surface of both sides of the fabric was treated with the treatment liquid having the formulation 1 in the above Example 1.

For comparison with the present invention, a comparative work cloth was obtained by the following conventional working method of Comparative Example 1.

Comparative Example 1 The same fabric as that used in Example 1 was prepared and impregnated with the treatment liquid of Formulation 1 using mangle and squeezed (a liquid absorption rate of 60%). Subsequently, the beam was continuously wound into a beam in a spread state, and the reaction was performed in a cold batch at 40 ° C. for 24 hours. After the completion of the reaction, it was washed with hot water at 80 ° C. and dried to obtain a work cloth for comparison.

For reference, the unbleached raw fabric was used for comparison.

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

[0023]

[Table 1]

As is clear from Table 1, it is understood that the processed cloth of the present invention has improved flexibility while suppressing a decrease in strength as much as possible.

[0025]

EFFECTS OF THE INVENTION According to the present invention, it is possible to perform modification processing of a cellulose fiber cloth while using a cellulolytic enzyme while suppressing a decrease in strength of the cloth as much as possible.

Claims (1)

[Claims] 1. A method for modifying a cellulose fiber cloth, wherein only the surface of the cellulose fiber cloth is treated with a cellulolytic enzyme.