JPH01174688A - Partial decoloring of fiber dyed material - Google Patents

Abstract

PURPOSE:To obtain a partially decolored product having a few local wear damage and variation and high commercial value, by bringing a fiber pad comprising a woven fabric impregnated with a decoloring solution into contact with a fiber dyed material such as woven fabric. CONSTITUTION:For example, fiber pads having 20-30mm one side length and 1-150mm thickness comprising polyester or nylon fabric are piled, sewed up and impregnated with a solution of decoloring agent such as hypochlorite in such a way that the ratio of the solution in a saturated state is >=20% based on dried fiber pad to give a fiber pad. The fiber pad together with a fiber dyed material such as woven and knitted goods is packed into a washer, brought into contact with the fiber dyed material by mechanical movement to partially decolor the fiber dyed. A high-quality partially decolored product having less friction loss free from lot-to-lot variability than conventional pumice method does is obtained. Cost is also low.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention is a method for partially decolorizing dyed fibers. Using this method, partially bleached jeans, so-called chemically washed jeans, can be produced.

Furthermore, in addition to jeans, it can also be used to produce antique-style items made by partially bleaching dyed woven fabrics, knitted fabrics, or non-woven fabrics.

(Conventional technology) Conventional chemical wash jeans are produced by stirring and contacting jeans woven and sewn using dyed warp yarns with pumice stone impregnated with a decolorizing solution such as sodium hypochlorite in a washer or other device. The jeans are manufactured by partially bleaching them.

The mechanism and definition of partial bleaching is that when a pumice stone containing a bleaching agent liquid comes into contact with the twill blue jeans fabric, a part of the impregnated bleaching agent liquid transfers from the pumice stone to the jeans, decomposing and bleaching the dye in this area. It's about doing. It should be noted that the decolorizing agent liquid is difficult to transfer to areas that are difficult to come into contact with pumice, and therefore, the dye in these areas is unlikely to decompose and decolorize, leaving the blue color as it is.

In this way, partially bleached so-called chemically washed jeans are completed.

(Problems to be Solved by the Invention) However, in the above conventional method, the hard pumice comes into impactful and local contact with the jeans during agitation contact, which tends to cause local damage to the textile material and partial decolorization. If it goes too far, even the inside of the fabric structure will be decolored, resulting in a hypermembrane color, which becomes a problem. Furthermore, since the quality of the pumice stones varies greatly and the liquid content of the decolorizing agent solution varies greatly from 20 to 60%, there is also the problem that decolorization treatment lots tend to be uneven. ': In the case of 5, the amount of pumice used is high and the number of times it can be reused is small, resulting in high costs. A large amount of pumice abrasion powder is mixed into the wastewater after treatment, making subsequent wastewater treatment difficult. Problems have also arisen, such as difficulty in disposing of pumice stones.

The present invention is an epoch-making invention that solves all of these problems.

(Means for solving the problems) The present invention provides one or more of woven, knitted or non-woven fabrics.
Fiber dyeing characterized by impregnating a fiber pad consisting of at least one seed with a decolorizing agent solution, and bringing this into contact with the surface of a dyed fiber material made of woven, knitted, or nonwoven fabric through physical movement to partially decolorize it. This is a method for partially decolorizing objects.

In other words, the present invention uses a fiber pad that is much softer than hard pumice stone, and uses a fiber pad impregnated with a decolorizing agent liquid to bring it into contact with the dyed fibers to be bleached by physical movement, resulting in very little impact. It has a soft contact, there is no damage to the fiber material that often occurs when using pumice stone, and there is no film coloring that occurs when using pumice stone, and there is no extreme variation in the content of the decolorizing agent that occurs when using pumice stone. Therefore, there will be no unevenness in decolorizing lots.

Furthermore, the fiber pad used in the present invention has less abrasion loss during contact than pumice, and with pumice, 273 of the amount used is consumed in one use, and only 1/3 of the amount used can be reused, but the fiber pad of the present invention In fact, about 5001iii1 can be used for fiber pads. Further, since the fiber pad used in the present invention does not generate abrasion powder such as that seen with pumice during treatment, subsequent wastewater treatment is easy. Furthermore, since the fiber pad of the present invention can be used repeatedly as described above, the amount of used products to be discarded is extremely small, and in addition, since it can be incinerated, disposal is easy.

The fiber pad used in the present invention refers to a mass of fibers made of one or more types of woven fabrics, knitted fabrics, or non-woven fabrics.

The necessary conditions for the fiber pad used in the present invention are that it has voids to hold the impregnating decolorizing agent liquid therein, and that the liquid content in the saturated state is 20% or more of the weight of the dry fiber pad, and that the impregnating decolorizing agent It must be made of a material that is not easily affected by liquids, and its shape must not collapse even when physical movement such as rotational stirring is applied while it contains a decolorizing agent liquid. If the liquid content during treatment is less than 20%, the amount of decolorizing agent liquid is too small and the decoloring effect is poor; on the other hand, if it exceeds 300%, the amount of liquid is too large and may damage the inner parts of the tissue of the dyed fibers to be bleached. The preferable liquid content is 20 to 120%, since liquid may enter and the effect of partially decolorizing only the tissue surface, which is the objective of the present invention, will be weakened. The size of the fiber pad is 20 to 300 mm in length on one side and 1 to 150 mm in thickness, preferably 50 to 50 mm in length on one side.
It has a diameter of 150 mm and a thickness of 5 to 20 m+s. - If the side length is less than 20 mm and the thickness is less than 1 ms, the volume, weight, and liquid content of the fiber pad will be too small to allow uniform stirring and contact movement, and sufficient liquid movement will not be possible. If the side length is 300 mm or more and the thickness is 150 mm or more, the pad is too large and the contact ratio with the dyed fiber to be bleached is reduced.
In addition, the fiber tissue that satisfies the condition of 0 or more that is likely to cause local contact may be any one of woven fabrics, knitted fabrics, or non-woven fabrics, or a combination of two or more types, but in the case of woven fabrics, knitted fabrics, and thin non-woven fabrics, the thickness Since it is too thin, it is possible to make a fiber pad by stacking 2 to 50 of these to a thickness of 1 to 150 m and sewing or gluing the periphery. Furthermore, it is possible to insert a material with good liquid absorbency such as sponge or cotton between the stacked fiber pads to increase the liquid absorbency and thereby further improve the effectiveness of the fiber pad. In addition, a weighted substance such as pebbles or shotgun may be inserted between the stacked fiber pads to give a sense of weight and improve the agitation contact property.Also, in the case of a thick nonwoven fabric of 1 m or more, preferably 50m or more, It can be used as is, cut into pieces. Furthermore, a structure in which a layer of the above-mentioned fiber pad is bonded to the surface of a three-dimensional object such as a sphere or a prism is also effective. That is, since the contact state during stirring contact differs depending on the three-dimensional shape, it is possible to obtain a unique decolorization pattern.

The fiber material used next may be of any kind, but it is best to choose fibers and binders that are not easily affected by the colorant solution, especially polyester fibers, nylon fibers, polyolefin 1m, vinylon fibers, acrylic fibers, etc. Synthetic fibers are preferable, and natural fibers such as cotton, wool, and silk can also be used, but they are easily damaged and are not advantageous.The dyed fibers to be bleached that can be treated with the present invention may be woven, knitted, or nonwoven; In addition to natural fibers such as cotton, wool, and silk, synthetic fibers such as polyester fibers, nylon fibers, polyolefin fibers, vinylon fibers, and acrylic fibers, and mixtures of these fibers can also be used. The bleaching agent used in the present invention may be any bleaching agent that is normally used for bleaching dyed textiles. Examples of oxidative bleaching agents include hypochlorite, chlorite, permanganate, and peroxide. Examples include hydrogen water, sodium peroxide, sodium perborate, barium peroxide, bleaching powder, etc. Reductive decolorizing agents include hydrosulfide, Rongalite, sulfite, acid sulfite, and glucose. The concentration of these bleaching agents used varies depending on the type of bleaching agent and the type of dyed fiber to be bleached, but for example, when bleaching cotton jeans using sodium hypochlorite, the effective chlorine concentration is 0.003~ A range of 10% is preferable.

The decolorizing equipment used in the present invention may be any type of equipment as long as it is a stirring type container that can bring the dyed fibers to be bleached and the fiber pad containing the decolorizing agent into contact as uniformly as possible through physical movement. For example, washers, other rotary stirring devices, and reversing stirring devices used for cleaning fabrics can be used.

In the decoloring treatment, the dyed fibers to be decolorized and the fiber pad containing the decolorizing agent are placed in these equipments, and stirred at room temperature to 6°C for a required time, for example, 3 to 300 minutes, to partially decolorize the dyed fibers. Depigmenting place!
lf& removes residual bleaching agent in partially bleached dyed fibers by washing.

(Function) The present invention is a method for partially decolorizing a fiber pad impregnated with a bleaching agent liquid by stirring and contacting the dyed fiber, and at the time of contact, the bleaching agent liquid in the fiber pad is directed toward the dyed fiber to be bleached. In this method, the dye is decomposed and decolorized. However, since the fiber pad is very soft, there is little shock when it comes into contact with it, and the contact is uniform, so there is no damage to the fiber material or deviation in color, which is the case when using pumice.Also, since the fiber pad is homogeneous, the quality of the pumice stone There is no variation in decolorizing lots due to variations in color, and since it is not brittle and abrasive like pumice, it can be reused many times, waste water treatment is easy, and waste fiber pads can be disposed of easily. be.

Conventionally, pumice stone has been used in the so-called stonewashing process, which takes advantage of its hardness by stirring and contacting it with jeans to impart flexibility to the jeans, and then use friction to scrape the surface of the fibers and remove the color. As an extension of this, a so-called chemical wash was developed in which pumice is impregnated with a decolorizing agent solution. Therefore, those skilled in the art believe that it is essential to use pumice with a hard surface for chemical washing, and the use and effectiveness of the fiber pad, which is much softer than the pumice of the present invention, has been elusive. After extensive research efforts, the inventors have discovered that the use of a soft fiber pad is the most advantageous way to solve all of the above-mentioned problems with conventional pumice stone use.

(Examples) The embodiments of the present invention will be described below using specific examples, but the present invention is not limited to these examples.

Example 1 16 pieces of polyester fiber fabric with size 6c x 10c
A fiber pad with a thickness of about 10 mm was made by stacking the layers and sewing the edges with a sewing machine. Approximately 2,000 fiber pads (approximately 30 kg)
) was immersed in a sodium hypochlorite aqueous solution containing 0.2% available chlorine for 3 minutes, and the liquid was drained to a liquid content of approximately 95%.
The fiber pad and 10 G pieces (70 kg) of stonewashed blue jeans were placed in a washer, and the jeans were subjected to rotational contact treatment for 30 minutes at room temperature to partially bleach the jeans. The jeans were then washed and dechlorinated to produce a product. The product thus obtained had high commercial value, with no damage to the fiber material, and uniform partial decolorization without conventional coloration.

Using the above used fiber pads, we repeatedly decolorized jeans using the same method as above, reaching the 300th treatment, but the resulting product had the same damage to the fiber material as the first product. It was a product of high commercial value as it was able to achieve uniform partial bleaching without any blemishes.

Also, from the 1st to the 300th treatment, there was almost no loft difference between each decolorization treatment, and the used fiber pads could be easily disposed of by burning them in an incinerator.

Comparative Example 1 A piece of pumice stone 100 with a diameter of 30~Loom- was immersed in a sodium hypochlorite aqueous solution containing 0.2% available chlorine for 3 minutes, and the liquid was drained to give a liquid content of 40%. washer
The pumice stone and 100 pieces (70 kg) of stone-washed blue jeans were placed in the container, and the jeans were subjected to rotational contact treatment for 30 minutes to partially bleach the jeans. The jeans were then washed and dechlorinated to produce a product.

The product thus obtained was heterogeneous and had low commercial value, with locally intense coloration and severe fiber abrasion in these areas. After treatment, the pumice was severely worn down and the weight of the remaining pumice was reduced by less than 35 kg, and a large amount of pumice powder was mixed into the waste liquid, making it difficult to dispose of the waste liquid.

In order to perform the second bleaching process on the jeans using the remaining pumice stone in the same manner as above, it was necessary to additionally use a new pumice stone 85.

Used pumice stone is non-flammable, bulky and difficult to dispose of.

Example 2 About 8 cm of needle-punched and heat-set nonwoven fabric made of 7G% by weight of polyester fibers and 30% by weight of polypropylene fibers with a thickness of 711II and a basis weight of 1200 g/m''.
It was cut into a size of x 8 am to make a fiber pad. 1,700 fiber pads (20,...) were added with 0.3% available chlorine.
After soaking in a sodium chlorite aqueous solution for 3 minutes and draining the liquid to reach a saturated liquid content of 95%, put the fiber pad and 100 pieces (70 kg) of stonewashed blue jeans in the washer. The jeans were partially bleached by rotary contact treatment for 40 minutes. The jeans were then washed and dechlorinated to produce a product. The product thus obtained had high commercial value, with no damage to the fiber material and even partial decolorization. The fiber pad after use was further used repeatedly in the same manner as above for 80 times, but the decolorizing effect and the shape of the batt did not change, and continued reuse was possible.

Example 3 Four layers of polyester fabric with a size of 8emxlOc- are stacked, and between the second and third layers, the same size and thickness is 20g+*
A fibrous pad approximately 23 mm thick was made by inserting a piece of polyethylene foam and sewing the periphery with a sewing machine. Approximately 1,000 pieces (20 kg) of the fiber pads were immersed in a sodium hypochlorite aqueous solution containing 0.2% available chlorine for 3 minutes, and the liquid was drained to give 120 kg.
After adjusting the liquid content to 100%, put the fiber pad and stonewashed blue jeans in a washer.
A pair of jeans (70 kg) was put therein and subjected to rotational contact treatment at room temperature for 30 minutes to partially bleach the jeans. The thus obtained product had no damage to the fiber material and had no common color and had high commercial value.

As mentioned above, fiber pads containing polyethylene foam can increase the liquid absorption rate, so compared to pads made only of fibers,
The amount of pads used can be reduced. ' Practical Example 4 Stack 14 polyester fabrics of size 8am x 8cm and sew around them to form a bag using a sewing machine.A small ball made of ceramic or pottery with a diameter of 2 to 8mm is placed between the 7th and 8th pieces. 15 to 30 pieces were placed in the bag and the bag was closed to make a fiber pad with a thickness of 12 to 18 sv.

Approximately 800 sheets (approximately 50 kg) of the fiber pads were treated with 0.0% effective chlorine.
Immerse in 15% sodium hypochlorite aqueous solution for 3 minutes,
After draining the liquid to a liquid content of 80%, the fiber pad and 100 pieces (70 kg) of stonewashed blue jeans were placed in a washer, and the jeans were subjected to rotational contact treatment for 30 minutes at room temperature. I did some bleaching. The jeans were then washed and dechlorinated to produce a product. The thus obtained product had no damage to the fiber material and had no common color and had high commercial value.

As described above, a fiber pad containing small balls can be made to have the optimum weight for stirring contact, so the amount of pad used can be reduced compared to a pad made only of fibers.

Example 5 Seven sheets of nylon fiber fabric were wrapped around a golf ball as a core and sewn with a needle to form a spherical fiber pad.

Approximately 500 spherical fiber pads (approximately 30 kg) were immersed in a sodium hypochlorite aqueous solution containing 0.15% available chlorine for 3 minutes, drained to a liquid content of approximately 60%, and then placed in a washer. The spherical fiber pad and 10 pieces of blue jeans (70
kg> was added and rotated and stirred for 20 minutes at room temperature to partially bleach the jeans. The jeans were then washed and dechlorinated to produce a product. The thus obtained product had no damage to the fiber material, and although it had very slight local decolorization unevenness, it had a natural and rather interesting decoloration state.

(Effects of the invention) By using the decolorizing agent liquid-containing fiber pad of the present invention,
A product with high commercial value without local damage to the fiber material and without common colors can be produced. In addition, there is no variation in the decolorization loft caused by the quality variation of pumice.Furthermore, the fiber pad has a service life approximately 400 times longer than pumice, making it economical.Wastewater treatment after decolorization is easy. It has the advantage that it is easy to dispose of it afterwards because the amount is small and it can be incinerated.

that's all

Claims (8)

[Claims] (1) A fiber pad made of one or more types of woven fabric, knitted fabric, or non-woven fabric is impregnated with a bleaching agent solution, and this is applied to the surface of the dyed fiber made of woven fabric, knitted fabric, or non-woven fabric by physical movement. A method for partially bleaching a dyed textile material, which is characterized by partially bleaching the dyed material by bringing it into contact. (2) The fiber according to claim 1, which uses a fiber pad that has voids for retaining an impregnated decolorizing agent liquid and has a liquid content of 20% or more of the weight of the dry fiber pad in a saturated state. Method for partial bleaching of dyed materials. (3) Fiber dyeing according to claims 1 and 2, which uses a fiber pad whose fiber material is one or more of polyester fibers, nylon fibers, polyolefin fibers, vinylon fibers, and acrylic fibers. How to partially bleach things. (4) A method for partially decolorizing dyed fibers according to claims 1 to 3, which uses a fiber pad that does not collapse in shape even when subjected to physical movement while containing a decolorizing agent liquid. (5) The length of one piece is 20 to 300 mm and the thickness is 1 to 15 mm.
5. A method for partially decolorizing dyed textiles according to claims 1 to 4, using a fiber pad having a length of 0 mm, preferably a length of 50 to 150 mm, and a thickness of 5 to 20 mm. (6) A method for partially decolorizing dyed fibers according to claims 1 to 5, which uses a superimposed fiber pad into which a liquid-absorbing substance is inserted. (7) A method for partially decolorizing dyed fibers according to claims 1 to 6, which uses a superimposed fiber pad into which a weighting substance is inserted. (8) A method for partially decolorizing dyed fibers according to claims 1 to 5, which uses a three-dimensional fiber pad bonded to the surface of a three-dimensional object.