JP6232511B1 - Denim product yarn manufacturing method, and denim product yarn, denim product fabric, and denim product manufactured by the method - Google Patents

Abstract

An object of the present invention is to provide a method for producing a yarn for denim products and the like, which can make a yarn containing nylon fiber as a main constituent fiber neutral and continuously dyed with an indigo dye. A method for producing a yarn for denim products, comprising a step of immersing a yarn containing nylon fiber as a main constituent fiber in an alkaline dyeing liquid at 35 to 88 ° C., and a step of oxidizing an indigo dye thereafter. The step of immersing the yarn in the dyeing liquid is performed in a state where tension is applied to the yarn so that the dye does not penetrate into the core portion of the yarn, and the dyed yarn for denim products is This is a method for producing a yarn for denim products, in which the core portion is white and the outside of the core is dyed by indigo. [Selection] Figure 1

Description

The present invention relates to a method for producing a yarn for denim products, and a yarn for denim products, a fabric for denim products, and a denim product produced by the method.

Denim products such as denim pants, denim jackets, and denim shirts are widely used as casual clothing. In unusual places, you can also see denim products such as candy using denim fabric.

As a denim fabric used for a conventional denim product, a twill fabric is generally used in which a cotton yarn dyed with an indigo dye is used as a warp and an undyed cotton yarn is used as a weft. As described in Patent Document 1, a conventional denim fabric warp is generally dyed so as to have a white background.

On the other hand, as in Patent Document 2 and Patent Document 3, denim fabrics using materials other than cotton have been proposed. For example, Patent Document 2 describes nylon denim using a woven fabric composed of spun yarns made of nylon hollow short fibers.

Patent Document 3 describes a method of dyeing synthetic fibers such as nylon and polyester with an indigo dye. According to [0013] of Patent Document 2, after a synthetic fiber such as polyester is put into a dyeing solution at a high temperature (90 to 130 ° C.), the dyed product is sufficiently washed and then dried. According to this method, it is said that it is possible to dye synthetic fibers, particularly ordinary polyester, with indigo dyes, which have been difficult to dye.

Japanese Patent Publication No.46-2789 JP 2004-316003 A Japanese Patent Laid-Open No. 10-280286

In the method of Patent Document 1, the yarn is dyed in the middle white. For this reason, while the user is using the denim fabric, the white portion of the thread is exposed due to the indigo dye dropping or abrasion of the thread due to friction. This creates a unique texture due to the color fading unique to denim fabrics. There are many users who enjoy the texture change due to aging unique to denim. Some users have used a sandpaper to polish the surface of jeans pants that they have just purchased to reproduce the used feeling.

Although Patent Document 2 describes nylon denim, this document does not describe dyeing a nylon thread into a medium white.

In the dyeing method of Patent Document 3, a synthetic fiber is immersed in a dyeing solution heated to a high temperature of 90 to 130 ° C. for 10 to 60 minutes for dyeing. For this reason, the thread | yarn consisting of a synthetic fiber may be dye | stained with an indigo dye to the core.

An object of this invention is to provide the manufacturing method of the thread | yarn for denim products in which the thread | yarn which contains a nylon fiber as a main component fiber can be dye | stained with an indigo type dyeing medium white. By utilizing the manufacturing method, the yarn containing nylon fiber as the main constituent fiber, but the core of the yarn is white and the outside is dyed by indigo, the yarn for denim products, the fabric for denim products, And to provide denim products.

It is a method for continuously producing a yarn for denim products by immersing a yarn containing nylon fiber as a main constituent fiber in a dyeing solution of 35 to 88 ° C. containing an indigo dye, and using the yarn as a dyeing solution. The dyeing process is performed in a state where tension is applied to the yarn so that the dye does not penetrate into the core of the yarn, and the dyed denim yarn has a white core at the core. The above-mentioned problem is solved by a method for producing a yarn for denim products in which the outside of the core is dyed by indigo.

By carrying out the above manufacturing method, a yarn containing nylon fiber as a main constituent fiber, the yarn core portion being neutral white and the outside of the core portion being dyed by indigo, the yarn for denim products Is obtained. By using this yarn for denim products, a denim product fabric can be obtained using the yarn as a yarn constituting the fabric. Furthermore, by using this denim product fabric, a denim product composed of the denim fabric can be obtained.

In the manufacturing method described above, the step of immersing the yarn in the dyeing solution is performed a plurality of times, the number of times of immersing is constant, and the indigo concentration of the dyeing solution is changed in the range of 5 to 100 g / L. Is preferred. Accordingly, it is possible to freely change the dyeing density of the yarn by changing the indigo density without increasing or decreasing the number of dyeing tanks containing the dyeing liquid.

In the above production method, dyeing of a yarn containing nylon fiber as a main constituent fiber is preferably immersed in an immersion liquid in a state where tension is applied to a rope made of the yarn. By bundling the yarns in a rope shape, it is possible to prevent yarn breakage due to tension or the like and to perform dyeing with a high yield.

In said manufacturing method, it is preferable that pH of a dyeing | staining liquid is 11.0-13.9. By doing so, the indigo dye can be easily dyed with the yarn, and the friction fastness of the indingo dye can be further improved.

In the above production method, the yarn containing nylon fibers as the main constituent fiber is preferably a spun yarn obtained by spinning nylon short fibers. By doing so, it is possible to finish the appearance of the denim product with a natural texture like using cotton yarn.

In the above production method, the nylon fiber is preferably a filament yarn composed of nylon long fibers. By doing so, it is possible to improve the strength of the yarn.

It is possible to provide a method for producing a yarn for a denim product, in which a yarn containing nylon fiber as a main constituent fiber can be dyed in white with an indigo dye and continuously dyed. By utilizing the manufacturing method, the yarn containing nylon fiber as the main constituent fiber, but the core of the yarn is white and the outside is dyed by indigo, the yarn for denim products, the fabric for denim products, And denim products can be provided.

It is explanatory drawing which shows an example of a rope dyeing machine.

Hereinafter, an embodiment of a method for producing a yarn for denim products will be described and described. The method of the present embodiment is a method of manufacturing a yarn for denim products by immersing a yarn composed of a yarn containing nylon fibers as a main constituent fiber in a dyeing solution of 35 to 88 ° C., and dyeing the yarn The step of immersing in the liquid is carried out in a state where tension is applied to the rope so that the dye does not penetrate into the core part of the thread. And the outside of the core is a method for producing yarn for denim products, which is dyed by indigo.

The step of immersing the yarn in the dyeing solution may be performed by rope dyeing or sheet dyeing, for example. In the case of rope dyeing, yarn breakage due to tension or the like is prevented because the yarn is immersed in the dyeing solution in a state of being bundled in a rope shape. In the case of sheet dyeing, the yarns are immersed in the dyeing solution in a state where a plurality of yarns are arranged in a sheet form. Since the step of bundling a plurality of yarns in a rope shape can be omitted, the manufacturing cost can be reduced.

The yarn containing nylon fibers as the main constituent fiber may be any yarn that exceeds 50% by mass of the nylon fibers in the total mass of the yarn. Examples of subcomponents other than nylon fibers include natural fibers such as cotton and wool, and chemical fibers such as rayon and polyurethane. These subcomponents can be blended or twisted.

Yarns containing nylon fibers as the main constituent fibers have a white core at the core, and the outside of the core is dyed with an indigo dye. For this reason, it is preferable that the yarn is solid. By leaving the white portion of the core part white, it becomes possible to expose the white part of the yarn over time as the denim product is used. As a result, it is possible to enjoy the color fading peculiar to denim as well as the yarn for denim products composed of conventional cotton yarn, although the yarn is mainly composed of nylon fiber.

Yarns containing nylon fibers as the main constituent fibers are lighter in weight, superior in tensile strength and quick-drying compared to conventional cotton yarns. For this reason, the fabric for denim products and denim products obtained by using yarns containing nylon fibers as the main constituent fibers are lightweight, not easily torn, and easily dry even when wet. In this respect, it is superior to denim products using conventional cotton.

The above-described white nylon fiber yarn is obtained by immersing the yarn in the dyeing solution while tensioning the yarn against an alkaline dyeing solution of 35 to 88 ° C., and then oxidizing the indigo dye. Can be obtained. The temperature of the staining solution is more preferably 78 to 88 ° C. When the yarn is immersed in the dyeing solution at the above temperature with tension applied thereto, the indigo dye can penetrate into the outside of the yarn and the indigo dye can not penetrate into the core portion of the yarn. Nylon has high crystallinity and is difficult to dye against indigo dyes. By setting the temperature range as described above, the outside of the core portion of the yarn can be dyed with an indigo dye even if the yarn has nylon fibers as constituent fibers. This is presumed to be because the distance between nylon molecules increases with high temperature, and indigo molecules easily enter between a plurality of nylon molecules.

For example, the rope dyeing machine 1 shown in FIG. 1 can be used to immerse the yarn composed of yarns containing nylon fibers as the main constituent fibers in a dyeing solution under tension. The rope dyeing machine 1 in FIG. 1 includes a spool 11 for winding a yarn 16 containing nylon fiber as a main constituent fiber, a refining tank 12, a plurality of dyeing tanks 13, a plurality of direction changing rollers 14, and an aperture. A roller 15 and an oxidation roller 17 are provided. In this apparatus, in the process in which the yarn is wound from one spool 11 to the other spool (not shown), the yarn is stored in the dyeing liquid stored in the dyeing tank 13 and in a gas containing oxygen such as the atmosphere. As it passes, the yarn is dyed continuously.

The refining tank 12 of the apparatus 1 contains heated water and removes impurities adhering to the surface of the yarn. In the dyeing tank 13, a dyeing solution containing a leuco body of a water-soluble indigo dye is placed. A roller 14 is disposed in the dyeing tank. A rope in which yarns containing nylon fibers as main constituent fibers are bundled with the roller 14 in the dyeing tank can be bridged in a tensioned state. By winding the yarn, the yarn can be passed through the dyeing liquid stored in the dyeing tank. In this way, the yarn containing nylon fibers can be immersed in the dyeing solution in a tensioned state. Thereafter, the extra dyeing liquid is dropped on the rope put into the dyeing tank by the pair of squeezing rollers 15. Thereafter, the rope passes through the oxidation roller 17. The indigo dye attached to the rope is oxidized and solidified in a gas containing oxygen such as the air when passing through the oxidation roller 17. The oxidation roller 17 is for earning a distance through which the rope passes, and a plurality of rollers are arranged with a predetermined pitch with respect to the vertical direction or the horizontal direction.

The structure of the dyeing machine when performing sheet dyeing can be the same as that of the rope dyeing machine of FIG. However, it is necessary to change the point of winding a plurality of yarns in parallel with the bobbin 16 and the tension associated with the yarns.

It is preferable to dye a yarn containing nylon fiber as a main constituent fiber a plurality of times. In this regard, the rope dyeing machine 1 of FIG. 1 includes one refining tank 12 and four dyeing tanks 13. The rope is subjected to immersion, squeezing and oxidation four times in the dyeing solution. Each time the rope passes through the dyeing tank, the indigo dye adheres to the yarn, and the yarn is dyed darker. Each dye tank 14 stores a dye containing an indigo dye. The indigo concentration of the staining solution can be changed in the range of 5 to 100 g / L. This makes it possible to change the dyeing density of the yarn without increasing or decreasing the number of dyeing tanks 13. For example, when it is desired to dye a yarn thinly, it can be dyed thinly by reducing the indigo concentration. If you want to dye a thick thread, you can increase it by increasing the indigo density. That is, the step of immersing the rope in the dyeing solution is performed a plurality of times, the number of times of immersing is constant, and by changing the indigo concentration of the dyeing solution in the range of 5 to 100 g / L, rope dyeing. Without changing the configuration of the machine 1, it is possible to freely change the dyeing density of the yarn.

The time for immersing the yarn or rope in the dyeing liquid is not particularly limited. For example, the immersion time per time may be 10 to 40 seconds. Similarly, the oxidation time is not particularly limited. For example, the oxidation time per time may be 60 to 240 seconds.

Although not shown in the rope dyeing apparatus 1 of FIG. 1, after passing the rope through the last dyeing tank, passing the dyeing tank filled with glue or blowing hot air, and then winding it around the other bobbin Can be done.

In the case of rope dyeing, a plurality of yarns are conveyed by a plurality of rollers 14 in a state where a plurality of yarns are bundled and lightly twisted. In a sheet dyeing method or the like in which a plurality of yarns are arranged in a sheet and supplied to a dyeing tank, if the yarn is thin, the yarn may break in the process of conveying the yarn with a roller. When the yarn breaks, the yarn winds around a dyeing device such as a roller, which significantly reduces the work efficiency. In the rope dyeing method, since the yarn is lightly twisted, it is difficult to cut even a fine yarn. For this reason, even a thin thread can be dyed efficiently. For example, it is possible to dye a 70-900 dtex yarn into a white.

When dyeing thin yarn without breaking it, it is conceivable to perform cheese dyeing in which the yarn is immersed in a dyeing solution in a state where the yarn is wound around a bobbin. However, in the case of cheese dyeing, dyeing is performed while circulating the dyeing solution with a pump, so that the core part of the yarn is dyed.

As described above, the temperature of the staining solution is set in the range of 35 to 88 ° C. When the temperature of the dyeing solution is excessively high, a facility for pressurizing the dyeing solution is required. For this reason, the structure of the dyeing machine can be simplified. Since the pressure-resistant equipment is not required, the yarn can be continuously supplied to the plurality of dyeing tanks using the plurality of rollers 14 as described above. Further, since it is not necessary to control the pressure, it is possible to perform dyeing not continuously but batchwise, and the efficiency of the dyeing work can be dramatically increased.

The pH of the staining solution is preferably 11.0 to 13.9. As described above, nylon has high crystallinity and is difficult to dye with indigo dyes. By adjusting the pH of the dyeing solution as described above, the dyeing property of the indigo dye to the yarn containing nylon fibers as the main constituent fibers can be improved, and the fastness of the dye can also be improved.

The yarn containing nylon fibers as the main constituent fiber may be a spun yarn obtained by spinning nylon short fibers, or may be a filament yarn constituted by nylon long fibers. In the case of a spun yarn, it is possible to finish it in the same texture as a conventional denim fiber yarn dyed with cotton indigo. When the filament yarn is used, it can be made into a denim fiber yarn having a high tensile strength and a glossy feeling. As described above, in the case of rope dyeing, the yield of the spun yarn is good because the yarn can be hardly broken. For example, the short fiber of nylon preferably has a fiber diameter of 15 to 48 μm, and more preferably 15 to 18 μm. For example, the long fiber of nylon preferably has a fiber diameter of 15 to 20 μm.

The indigo dye used has a structure of the following chemical formula 1 in the chromophore, and is a vat dye that forms a leuco body by being reduced to be water-soluble and is insoluble in water by oxidation. That's fine.

The indigo dye used is preferably an indigo represented by the following chemical formula 2.

It is preferable to add a reducing agent and / or an alkali agent to the staining solution. Examples of the reducing agent to be blended include sodium dithionite and glucose. Examples of the alkaline agent include sodium hydroxide and potassium hydroxide.

Hereinafter, the present invention will be described more specifically with reference to examples.

In the following manner, a yarn composed of nylon fibers was dyed with an indigo dye to prepare a test piece. Each test piece was dyed under various conditions to evaluate whether the core portion of the yarn was dyed white, the dyeing density (dyeing density), and the fastness to friction.

As the yarn, a 280 dtex spun yarn spun using a nylon fiber having a fiber length of about 38 mm was used. The staining solution was prepared by mixing indigo dye, NaOH, sodium dithionite, glucose, and water, and changing the pH, indigo concentration, and temperature in various ways.

A bundle of 500 of the above-mentioned spun yarns, which was put on a rope, was wound around a bobbin in a state where six were aligned and set on the rope dyeing machine of FIG. Hot water is supplied to the smelting tank, and the above dyeing solution is supplied to the plurality of dyeing tanks. For this reason, refining is performed in the process of transporting the rope with a plurality of rollers, and then immersion, squeezing, and oxidation in a dyeing solution are continuously repeated. The bath ratio was set to about 1: 300, and the immersion time per time in the dyeing solution was 40 seconds, and the oxidation time per time was 240 seconds.

Rope dyeing was performed by changing the temperature of the dyeing solution and the pH of the dyeing solution as shown in Table 1. Each yarn dyed by changing the temperature and pH was used as a warp, and a yarn composed of undyed nylon fiber was used as a weft to prepare a twill test piece. The indigo concentration of the staining solution was 15 g / L. About each test piece, the dyeing | staining density | concentration by visual observation was evaluated and the friction fastness of the dye was evaluated based on the method of JISL0849II method (dry type). In addition, each yarn was cut and the cross section was visually observed. Table 2 shows the evaluation results of each test piece. In Table 2, those marked with “x” in the middle white column are those in which the middle white portion could not be confirmed in the yarn core portion, and those marked with “○” are the Nakagusuku portion in the yarn core portion. It was confirmed. Those marked with × in the columns of fastness to rubbing and dyeing concentration indicate that the dye of the test piece after dyeing was fading or easily transferred by friction, and that the color of the test piece after dyeing was faint. . Those marked with ◯ in the column of the fastness to rubbing and the dyeing density indicate that the fastness to rubbing and the dyeing density were excellent. Those marked with ◎ in the columns of friction fastness and dyeing density indicate particularly excellent friction fastness and dyeing density.

As is clear from Tables 1 and 2, it was confirmed that the higher the pH and temperature of the dyeing solution, the higher the dyeing density and the fastness to friction. On the other hand, it has been found that if the temperature of the dyeing solution is excessively high, the core portion of the yarn is dyed. This is presumably due to the fact that the temperature of the dyeing solution approaches the boiling point, bubbles rise from the dyeing solution, and the dye easily penetrates into the rope.

Next, the pH of the dyeing solution was fixed at 12.0, the temperature was fixed at 80 ° C., the indigo concentration was changed within the range of 5 to 100 g / L, and the dyed solution was put into four dyeing tanks of a rope dyeing machine. Thereafter, the rope dyeing machine was operated to dye the yarn by changing the indigo concentration, and a twill test piece was prepared in the same manner as described above using the dyed yarn.

Test pieces when all four staining tanks have an indigo concentration of 10 g / L, test pieces when all four staining tanks have an indigo concentration of 50 g / L, and all four staining tanks at 80 g / L When compared with the test piece in the case of the indigo concentration, it was confirmed that the indigo color of the test piece became deeper as the indigo concentration became higher. It was confirmed that the intensity of dyeing can be controlled by changing the dyeing concentration of the dyeing liquid to be put into the dyeing tank without changing the apparatus configuration such as changing the number of dyeing tanks.

A denim product yarn and a denim product fabric were prepared by the same manufacturing method as that of the test piece 11 that showed good results in the above evaluation. Then, according to a regular method, jeans pants were sewn using the fabric for denim products. The jeans pants made of nylon fiber are superior in quick-drying and lightweight compared to conventional jeans pants made of cotton. The texture of jeans pants made of nylon fiber was the same as that of jeans pants made of conventional cotton. The surface of the jeans pants made of nylon fiber was scraped with sandpaper and used for processing, such as washing, and the color fading was similar to that of conventional jeans pants made of cotton. On the other hand, it was confirmed that nylon jeans pants are less likely to tear than conventional jeans pants made of cotton, and in particular tend to be difficult to tear from a used-processed portion.

DESCRIPTION OF SYMBOLS 1 Rope dyeing machine 11 Thread winding 12 Refining tank 13 Dyeing tank 14 Roller 15 Drawing roller 16 Yarn 17 Oxidizing roller

Claims (9)

It is a method of continuously producing a yarn for denim products by immersing a yarn containing nylon fiber as a main constituent fiber in a dyeing solution of 35 to 88 ° C. containing an indigo dye and a reducing agent ,
Indigo dyes become water-soluble by being reduced, and insolubilized in water by oxidation.
The step of immersing the yarn in the dyeing solution is performed continuously in a state where tension is applied to the yarn so that the dye does not penetrate into the core portion of the yarn,
A method for producing a yarn for denim products, wherein the core portion of the dyed denim product yarn is neutral white and the outside of the core is dyed with an indigo dye. 2. The method for producing a yarn for denim products according to claim 1, wherein the step of immersing the yarn in the dyeing solution comprises immersing the yarn made in the dyeing solution in a state where tension is applied to a rope constituted by the yarn. The step of immersing the yarn in the dyeing solution is performed a plurality of times, the number of times of immersing is constant, and the indigo concentration of the dyeing solution is changed within a range of 5 to 100 g / L. The manufacturing method of the thread | yarn for denim products of description.   The method for producing a yarn for denim products according to any one of claims 1 to 3, wherein the pH of the dyeing solution is 11.0 to 13.9. The method for producing a yarn for denim products according to any one of claims 1 to 4, wherein the yarn containing nylon fibers as a main constituent fiber is a spun yarn obtained by spinning nylon short fibers. The method for producing a yarn for a denim product according to any one of claims 1 to 5, wherein the yarn containing nylon fiber as a main constituent fiber is a filament yarn made of long nylon fibers. The yarn comprising nylon fibers as a main constituent fiber, a middle white core yarn, it states der outside stained by indigo dyes of the core,
Indigo dyes are denim yarns that have the property of becoming water-soluble by being reduced in the presence of a reducing agent and being insoluble in water by being oxidized . A denim product fabric using the denim product yarn according to claim 7 as a yarn constituting the fabric. The denim product comprised from the fabric for denim products described in Claim 8.

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