JP2003306879A - Method for decoloring color jeans and color jeans product obtained by the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for decoloring or discoloring thick color jeans in a desired color tone and to provide a color jeans product rich in well-worn feeling thereby. <P>SOLUTION: The method for decoloring the color jeans comprises immersing the thick color jeans into a tank controlled so that a bath ratio of the thick color jeans to a reducing bleaching agent solution is 1:(15-50) and decoloring the color jeans under an acidic condition at about 85°C solution temperature in the tank. The reducing bleaching agent solution is preferably hydrosulfite and is used in a concentration of 1-10 g/L. An acetic acid buffer solution is preferably used as the solution having an acidic PH and the PH of the acetic acid buffer solution is adjusted to about 4.5. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for decolorizing thick colored jeans and a decolorizing color jeans product by the method.

[0002]

2. Description of the Related Art Conventionally, jeans have been widely used as casual wear among young people. In recent years,
Jeans tend to be worn and worn in a worn and faded state, and such a soft fashion trend has become established. Therefore, various treatment techniques for making jeans faded have been developed, and an increasing number of these treatment techniques are commercially available in a decolored or faded state to a desired degree.

As the above-mentioned decolorization or fading technology, there are a stone wash method and a chemical cleaning method. The stone wash method is a method in which jeans and processing stones are put into a special washing machine and washed with warm water at about 70 ° C for about 30 to 60 minutes, which emphasizes worn-out feeling and gives a soft feeling. . In this method, the processing time becomes long in order to obtain a sufficient fading effect and soft feeling, and the stone material used together is crushed during the processing and adheres to the seams of jeans, which makes it difficult to remove the stone material. was there.

As a chemical cleaning method, a bio-washing method in which jeans are washed with an enzyme, or a bleaching method in which jeans are dipped in a dilute aqueous solution of an oxidizing bleaching agent such as sodium hypochlorite or sodium chlorite to wash There is an out method. In the former biowash method, it is difficult to fix each condition because the function of the enzyme used is easily influenced by PH, temperature, and other conditions, and in the latter bleach-out method, it is effective in the bleaching agent. Due to the high chlorine concentration and strong irritation, special attention must be paid to the treatment. Further, in the latter bleach-out method, the decolorization reaction is slow and the processing time is long, and it is necessary to add a large amount of a bleaching agent, as well as to neutralize the chlorine produced during decolorization and to prepare an aqueous solution after decolorization. There was a problem that a treatment process for neutralization was indispensable.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and is a color capable of bleaching or fading thick-colored jeans to a desired degree quickly and at low cost. It is an object of the present invention to provide a decolorizing method for jeans and a decolorizing color jeans product having a strange color tone by the method.

[0006]

In order to solve the above-mentioned problems, according to the present invention, the thick colored jeans and the reducing bleaching solution are immersed in a tank having a bath ratio of 1:15 to 50, and It is characterized in that it is subjected to decolorization treatment under an acidic condition in which the solution temperature is about 85 ° C. Thick colored jeans to be treated are 10 to 15 ounces. The reducing bleach used in this treatment solution is preferably hydrosulfite, in which case it is used at a concentration of 1-10 g / l. In addition, it is preferable to use an acetic acid buffer solution for PH under acidity, and the pH is adjusted to about pH 4.5.

According to the present invention, thick-colored jeans that have been decolorized or faded to the desired degree by the above method are washed with water, dehydrated and dried, and the surface after dehydration and drying is subjected to an appropriate scraping treatment to give a strange color tone. It is the color-blending jeans that are brought out.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below. In the present invention, the dye of the thick color jeans fabric is reduced by using a reducing bleach under acidic conditions to decolorize to a desired condition, and specifically, the surface layer surface of the thick color jeans is made to have a certain degree of shade. Only by fading (color fading) until the inner layer is completely decolorized.

The color jeans according to the embodiment of the present invention are woven with cellulosic fibers dyed with a reactive dye or a direct dye and woven, and more specifically, those singly or blended with cotton yarn or regenerated cellulose fiber. In addition, it is a cloth or woven fabric woven from a core spun yarn in which spandex which is an elastic fiber is used as a core and the periphery thereof is coated with a cellulosic fiber. Spinning is done by conventional spinning methods and woven into 10-15 ounce thick colored jeans. At this time, the color jeans may be woven by using the dyed warp yarn and the undyed weft yarn, or may be the one that is woven by the undyed warp yarn and the weft yarn and then dyed by a conventional method.

Examples of the reducing bleaching agent include hydrosulfite, sodium hyposulfite, thiourea dioxide and rongalite as sulfinic reducing agents, and stannous chloride as tin reducing agents. Of these, hydrosulfite is preferable because it can be easily handled and has a high effect of improving the fastness.

The treatment temperature and treatment time for decolorization using the above reducing bleaching agent differ depending on the concentration used, but the treatment temperature is in the range of about 80 ° C to 90 ° C, preferably about 85 ° C.
The processing time is 5 minutes to 30 minutes, preferably 10 minutes to 20 minutes. Thus, the concentration of the reducing bleach is 1.0 g / l
It is set to 10.0 g / l.

The pH under acidic condition is 1.5 to 5.0, but about 4.5 is preferably used. Although either an organic acid or an inorganic acid can be used to adjust the pH,
An acetic acid buffer solution is preferable because it can be easily handled.
Here, the decolorization treatment is performed in a short time by performing the decolorization with a reducing bleach under acidic conditions, thereby suppressing the strength reduction of the fiber, and without decolorizing the dye in the fabric, only the surface layer surface is uniformly formed. It has been clarified that fading can be done richly.

The bleaching treatment is carried out in the thick color jeans in a bath ratio of 1:15 to 50, preferably 1:20 to 30 in the reducing bleach solution. Thick color jeans are approximately 0.7mm to 1.2m in terms of the thickness of the woven fabric.
m.

The decolorized thick colored jeans are washed with water, and if necessary, a finishing agent such as a water repellent, a softening agent or an antistatic agent is added as a functional agent to give a desired finishing treatment. Is applied. This washing with water is arbitrarily set, but the reducing bleaching agent adhering between the fibers can be sufficiently removed only by washing with warm water of about 40 ° C. for about 5 minutes about twice.

The decolorizing color jeans which is the object of the present invention,
After performing the desired decolorization treatment as described above, it is obtained by appropriately dehydrating and drying, and this product is desired to be decolorized only on the surface layer surface as compared with the conventional product, and the inner layer portion remains unbleached. It can be variously varied in hue. When the surface layer of the decolorized color jeans is appropriately scraped to expose the unbleached part at random, the unique color tone as if it had worn out will be exhibited. Although any processing means can be used for the shaving treatment, a stone wash method or a rubbing method using sandpaper is generally used.

An example implemented based on the above embodiment will be described below. (Example 1) Warp density of 62-66 yarns / inch and weft yarn density of 42-44 yarns / inch were obtained by using warp yarns made of 6-count single yarn of 100% cotton dyed with reactive dye and undyed weft yarns. Twill-weave dark purple color jeans was mixed with hydrosulfite 3g / l and the acid concentration was adjusted to PH4.5 with 0.5g / l of acetic acid buffer solution, and the acid concentration was adjusted to PH4.5. After soaking in the bath ratio of about 20 minutes, take out. Then, after being washed twice with warm water of about 40 ° C., it is soaked in warm water also containing a softening agent of about 40 ° C. for about 10 minutes for softening treatment,
It was dehydrated and dried by a conventional method. In the dried jeans, the surface layer portion was lightly decolorized, but the inner layer portion was not decolorized, and thus was discolored to have a pale violet color. FIG. 1 shows this state in a cross-sectional view in the thickness direction of the woven fabric, in which the a and c parts on the front and back sides are discolored. Next, the surface layer portion of this jeans was rubbed with sandpaper to randomly expose the unbleached portion. In this product, as shown in FIG. 2, the texture color of the b portion of the inner layer was partially revealed, and this exhibited a hue of a worn-out atmosphere as a whole.

By the way, as a comparative example to the above, a decolorizing treatment which is generally carried out under an alkaline condition with sodium hydroxide was carried out. In this case, no change in shade was observed in the color jeans, and therefore, even if the scraping treatment was performed, a slight change in hue could not be produced.

Further, the same decolorization treatment was carried out under acidic conditions using sodium hypochlorite which is an oxidative bleaching agent. In this case as well, it was similar to the above.

[0019]

EFFECTS OF THE INVENTION The present invention is constituted as described above, and the color bleaching of the reducing bleaching agent is performed by subjecting the color jeans having a certain thickness to the decolorizing treatment with the reducing bleaching agent under acidic conditions. A special fading treatment is carried out to accelerate the reaction. That is, in the above treatment, the color jeans made to have a certain thickness are efficiently decolorized to a desired degree in the predetermined surface layer portion, while the inner layer portion is left unbleached. By using it in combination with the appropriate scraping treatment, it is possible to inexpensively and efficiently produce even a worn-out or unusual color tone.

[0020]

[Brief description of drawings]

FIG. 1 is a sectional view in the thickness direction of a heavy-duty color jeans according to the present invention.

FIG. 2 is a perspective view showing a state in which the thick color jeans shown in FIG. 1 are subjected to a scraping process.

[Explanation of symbols]

a Surface of thick-colored jeans b Back of thick color jeans c Inner layer of thick colored jeans

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) D06L 3/10 D06L 3/10 D06P 5/00 121 D06P 5/00 121 123 123 123 F term (reference) 3B031 AA08 3B154 AA02 AB31 BA51 BB32 BB58 BD03 BF01 BF12 BF25 DA13 4H057 AA02 CA01 CB59 CC03 DA01 DA24 EA11 GA07 GA13 GA21 GA24 GA25 HA01 HA05

Claims (6)

[Claims] 1. Thick colored jeans and a reducing bleach solution are immersed in a bath having a bath ratio of 1:15 to 50, and are decolorized under an acid condition in which the temperature of the solution in the bath is about 85 ° C. A method for decolorizing colored jeans, which is characterized in that 2. The fabric of thick colored jeans is approximately 10 to 10.
15. Use of a 15 ounce one.
How to decolor the jeans mentioned. 3. The reducing bleaching agent is hydrosulfite 1
The concentration is set to 10 to 10 g / l.
How to decolor the jeans mentioned. 4. The pH under acidic condition is adjusted to about pH 4.5 by using an acetic acid buffer solution.
Alternatively, the method for decolorizing colored jeans according to item 2. 5. A color jeans product, characterized in that the color jeans decolorized by the method for decoloring color jeans according to any one of claims 1 to 4 are washed with water and dehydrated and dried. 6. The color jeans product according to claim 5, wherein the surface of the dehydrated and dried color jeans is subjected to a scraping treatment.