JPH08100374A - Process for discoloration of cellulose fiber cloth - Google Patents

Abstract

PURPOSE: To provide a process for discoloration treatment capable of exhibiting homogeneous natural wash-bleached feeling and worn--out appearance by applying specific treatments of several steps on cellulose fiber cloth. CONSTITUTION: After a resin liquid is printed or applied on the surface of cellulose fiber cloth, preferably regenerated cellulose fiber cloth or solvent- spinning cellulose fiber cloth e.g. by a printing machine such as a screen printing machine or a coater such as an air-doctor coater, the cloth is subjected to heat treatment to form resin coating film. Subsequently, this is dyed with indigo dyes and the fibers are thinned as much as 0.05-5.0% by using cellulose decomposition enzyme followed by thermal drying using a rotary dryer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discoloration processing method for a cellulosic fiber cloth.

[0002]

2. Description of the Related Art In recent years, the trend of fashion in the clothing field has become more and more diversified, and it is expected to be demanded mainly by young people, such as fading of washed-out color, worn-out feeling, and worn-out clothes. Is becoming.

[0003] In order to apply a worn-out or wash-bleached fading treatment to a cellulosic fiber cloth, there is a method of printing in spots using a dye-resisting method or a discharge method, but the drawback of this method is
The dye-protected area and the discharge-printed area are too clear to be clearly discerned, and it is not possible to obtain a natural wash-bleached fading feeling.

As another method for obtaining a wash-bleached color fading feeling, there is a method in which mottled naps are applied to the surface of the cloth. According to this method, it is possible to observe as if the color has faded due to diffuse reflection on the surface of the cloth. However, it cannot be said that the fading effect itself is sufficient.

Another method of fading is to accelerate the fading by using a bleaching agent. According to this method, although the degree of fading can be easily controlled, the bleached fabric is yellowed. There was a problem that occurs.

Further, there is also a fading processing method by a stone wash method of physically rubbing a cloth with pumice stone. According to this method, a very good wash exposed tone can be expressed, so that fading is performed. Although it is suitable as a processing method, there are problems that fine particles of pumice crushed during processing remain on the cloth or the load of drainage increases.

[0007]

The present invention has been made in view of the above circumstances, and an object thereof is to obtain a fading processing method which does not have the above-mentioned drawbacks and problems by a completely new idea. It is a thing.

[0008]

SUMMARY OF THE INVENTION The present invention achieves the above object and has the following configuration. That is, according to the present invention, "the surface of a cellulosic fiber cloth is printed or coated with a resin liquid, heat-treated to form a resin film, and then dyed with an indigo dye, and then the cellulosic fiber is 0.05%.
The method is a method for fading processing of a cellulosic fiber cloth, which is characterized in that a cellulose-decomposing enzyme treatment is carried out to an extent that the amount is reduced by up to 5.0%, followed by heating and drying with a rotary dryer. Hereinafter, the present invention will be described in detail.

The cellulosic fiber cloth used in the present invention is a woven or knitted fabric composed of natural cellulosic fibers such as cotton and hemp, regenerated cellulosic fibers such as viscose rayon, polynosic and cupra, and solvent spun cellulosic fibers. , Non-woven fabric or these cellulose fibers,
Woven fabrics, knitted fabrics or the above-mentioned cellulose fibers composed of a blended yarn or a blended yarn composed of natural fibers such as wool and silk, semi-synthetic fibers such as acetate and triacetate, synthetic fibers such as polyester, acrylic, nylon and vinylon And the above-mentioned natural fiber, semi-synthetic fiber, synthetic fiber and the like, mean a woven woven fabric, a knitted knitted fabric, a mixed woven woven fabric, a mixed knitted knitted fabric and the like.

In particular, in order to effectively obtain the fading effect in the method of the present invention, it is preferable to use regenerated cellulose fiber or solvent-spun cellulose fiber as the cellulose fiber, and the mixing ratio thereof is 65% or more. As for the surface morphology of the cloth, it is preferable to use a cloth having a woven or knitted structure with a surface change to obtain preferable results.

In the method of the present invention, first, the above-mentioned cellulosic fiber cloth is used, and the surface thereof is printed or coated with a resin liquid and heat-treated to form a resin film. As the resin used here, a urethane resin, an acrylic resin, a melamine resin, an epoxy resin, or a modified product thereof, which is capable of forming a film, can be used.

These resins are used for screen printing machines such as screen printing machines, rotary printing machines, transfer printing machines, air doctor coaters, blade coaters, rod coaters, knife coaters,
A squeeze coater, a reverse roll coater, a transfer roll coater, a gravure coater, a kiss roll coater, a cast coater, a spray coater, a curtain coater, a calendar coater or the like is used to print or coat a part or all of the fabric surface.

At the time of printing or applying the resin liquid, it is also possible to mix pigments, functional liquids or powders into these resin solutions. The printing amount and the coating amount may be appropriately determined within the range of 10 to 100 g / m ² according to the purpose.

The resin applied to the surface of the cloth is
Appropriate heat treatment is carried out in the range of 10 to 180 ° C. for 0.5 to 5 minutes to immobilize it as a resin film on the cloth.

Next, in the present invention, the cellulosic fiber cloth on which the resin film is formed is dyed with an indigo dye. The dyeing with the indigo dye is carried out by a general and commonly used indigo dyeing method.

After dyeing with indigo, in the present invention, the cloth is subjected to a cellulolytic enzyme treatment to the extent that the cellulosic fiber is reduced by 0.05 to 5.0% by weight. As the cellulolytic enzyme used here, an enzyme containing cellulase as a main component is used.

At the time of enzyme treatment, the enzyme concentration, treatment temperature, and
The treatment time is determined in advance by experiments, and under this condition, the enzyme treatment is performed using a washer such as a rotary washer, a drum dyeing machine, and a rotary washing device. Usually 4 treatment baths
The above-mentioned cloth is put into a treatment solution whose pH is adjusted to 4.5 to 5.0 while being kept at around 5 ° C, and the cloth is treated for 45 to 90 minutes to reduce the weight loss rate of the cellulose component of the cloth to 0.05. The weight reduction treatment is carried out in the range of ˜5.0 wt%, preferably 0.5˜3 wt%. In this case, the form of the cloth may be in the form of a sewn product in addition to the form of a sheet, and may be in one line.

In the present invention, after the enzyme treatment, heating and drying are carried out using a rotary dryer. By using a rotary dryer, the surface of the fabric is impacted in the drying process, and the surface is intentionally fluffed. The amount of cloth (or sewn product) to be put into the dryer at this time is preferably in the range of 7 to 15 kg in terms of dry weight per 1 m ³ , and the collision energy of 1 to 5 kg per 1 m ^{2 of} cloth. Is preferably adjusted so that As the treatment temperature and time, a dry heat treatment at 40 to 90 ° C. for 1 to 3 hours is preferable.

When the cloth is put into the dryer, general-purpose softeners such as silicone-based, aliphatic-based and polymer-based softeners, formalin-based, urea-formalin-based, melamine-based, epoxy-based, glyoxal-based, polyamide-based There is no problem even if it is dipped in the treatment liquid of the general-purpose resin processing chemicals, squeezed, dried and heat-treated.

By performing these treatments, it is possible to obtain the cellulosic fiber cloth subjected to the fading treatment of the present invention. The present invention has the above configuration.

[0021]

When the indigo dyeing is performed after forming the resin film on the surface of the cellulosic fiber cloth as in the method of the present invention, the parts other than the resin film part are dyed, and the part protected by the resin film is retained without being dyed. When the cloth in such a state is treated with a cellulolytic enzyme, the enzyme acts on the cellulose part of the cloth and the resin film on the surface part of the cloth structure is removed, and in the indigo dye, the part where the resin film is removed is removed. Will cause crying. If the resin contains pigments, the color of the fabric will bleed,
The effect of being mixed with the color of the pigment contained in the resin also occurs.

When such a cloth is heated and dried by using a rotary dryer, the texture surface of the cloth is rubbed and worn out,
A feeling of fading occurs, and the friction causes the resin on the surface of the tissue to fall off, improving the texture of the fabric. In particular, when regenerated cellulose fibers or solvent-spun cellulose fibers are used as the cellulosic fibers, fibrillation proceeds in the warp axial direction of the fibrous material, and the entire fabric becomes thin and fluffed. Due to this effect, the refractive index changes, and the surface appears more fading. Also, due to the combination of these effects, the color change portion due to the resin film remains only in the deep portion of the surface texture of the cloth, and the cloth as a whole appears to be discolored.

[0023]

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) Discoloration effect The discoloration of the surface of the fabric was judged by the naked eye by the following three-stage evaluation. ◯: A fading feeling is obtained Δ: A slight fading feeling is obtained ×: No fading feeling is obtained

(2) Uniformity of Discoloration The uniform discoloration of the fabric surface was evaluated by the following three-stage evaluation by the naked eye. ◯: Uniform Δ: Somewhat nonuniform ×: Nonuniform

Example 1 Twill fabric made of 100% viscose rayon and using No. 30 single yarn for soft yarn (135 warps / inch, weft density 8)
0 pieces / inch, basis weight 150 g / m ² ) are prepared, and the acrylic resin liquid shown in the following prescription 1 is printed on this using a screen printing machine at a coating amount of 50 g / m ^{2 and} dried at 110 ° C. for 90 seconds. After that, heat treatment was performed at 160 ° C. for 3 minutes to form a colored resin film on the surface of the cloth.

Prescription 1 BR-700 96 parts (manufactured by Shin-Nakamura Chemical Co., Ltd., acrylic binder) NK Faster MEG 1 part (manufactured by Shin-Nakamura Chemical Co., Ltd., reaction accelerator) Ryudye -W Black B 3 parts (Dainippon Ink Chemicals) Industrial Co., Ltd., pigment)

Next, after immersing in a dyeing solution of the following formulation 2, squeezing and squeezing with a mangle at a squeezing rate of 100%, and drying with a tenter at 110 ° C. for 90 seconds. Prescription 2 Indigo Pure 10 g / liter (BASF Corporation, indigo dye) Algin paste (5%) 40 g / liter

Subsequently, after dipping in a solution of the following formulation 3, the solution was squeezed and squeezed with a mangle at a squeezing rate of 100%, exposed to saturated steam at 103 ° C. for 30 seconds, and then thoroughly washed with water. Recipe 3 Caustic soda 50 g / l Hydrosulfite 50 g / l

After that, it was dipped in a solution of the following formulation 4 and squeezed and squeezed with a mangle at a squeezing rate of 100%. Then, it was thoroughly washed with hot water and dried to obtain an indigo-dyed cloth. Prescription 4 Hydrogen peroxide water (35%) 10 cc / liter Acetic acid (48%) 10 cc / liter

Here, a dress shirt was sewn using a cloth dyed with indigo, and this was treated with an enzyme solution of the following formulation 5 (bath ratio 1:30) at 45 ° C. for 1 hour using a washer. . The weight loss rate at this time was 1.6%. Prescription 5 Entilon CM-40L 1.5 g / liter (Nakto Kasei Co., Ltd., cellulase enzyme) Acetic acid (48%) 2 cc / liter Sodium acetate anhydrous 2 g / liter (pH = 4.5-5.0)

The sewn product after the enzyme treatment is washed with hot water at 95 ° C. for 15 minutes, dehydrated and then dried with a rotary dryer at 50
Drying was performed at -60 ° C for 60-90 minutes to obtain a discolored processed product of the present invention.

For comparison with the present invention, the enzyme solution of Formulation 5 was not used in this Example, but instead of this, pumice stone (15 g / piece on average) was added to the same amount of water as the sewn product, and 45 ℃
A fading-processed product for comparison (Comparative Example 1) was obtained in the same manner as in this example except that the washing was performed with a washer for 1 hour. Further, for comparison with the present invention, the fabric dyed with indigo in this example was raised by a needle cloth raising machine, and then the same dress shirt was sewn to obtain a discolored processed product (Comparative Example 2).

The present invention and the comparative processed products were evaluated,
The results are shown together in Table 1.

[Table 1]

As is clear from Table 1, according to the processing method of the present invention, it is possible to obtain a uniform and effective wash-bleaching discoloration sensation that cannot be obtained by the conventional method. Moreover, the conventional technology can be used as it is for the apparatus and process to be used, and industrial production is sufficiently possible.

[0036]

According to the present invention, it is possible to obtain a uniform cellulosic fiber cloth having a good fading effect.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location D06P 5/08 DBB A 5/20 C

Claims (1)

[Claims] 1. A surface of a cellulosic fiber cloth is printed or coated with a resin liquid, and heat-treated to form a resin film, which is then dyed with an indigo dye, and then the cellulosic fiber is 0.05%.
A method for discoloring a cellulosic fiber cloth, which comprises subjecting the cellulolytic enzyme treatment to a weight reduction of up to 5.0% and then heat-drying with a rotary dryer.