JPH0711532A - Production of unlevelly dyed yarn of cellulose fibers and woven or knitted fabric using the yarn - Google Patents

Abstract

PURPOSE:To provide a method for producing the unlevelly dyed yarn by dyeing an additionally twisted filament yarn and a spun ground twisted yarn, both comprising cellulosic fibers in small lots. CONSTITUTION:A method for producing the unlevelly dyed yarn of cellulosic fibers comprises additionally twisting an additionally twisted filament yarn and a spun ground twisted yarn, both comprising cellulosic fibers, in a prescribed twisting number in an additionally twisting direction, dyeing the additionally twisted yarns in a cheese-like state and subsequently untwisting the dyed yarns in a prescribed untwisting number in a direction reverse to the additionally twisting direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a spot dyeing yarn of cellulosic fibers and a woven / knitted fabric formed by using the yarn.

[0002]

2. Description of the Related Art Conventionally, various methods have been used for dyeing cellulosic long-fiber post-twisted yarns and spun ground twisted yarns. Among them, top dyeing, indigo dyeing, and spec dyeing Etc. have been widely used as typical ones.

The top dyeing has a large lot due to the dyeing of cotton in the spinning process using a blend of two or more colors of cotton as a spun yarn, which is contrary to the current fashion trend of high-mix low-volume production. In addition, it takes a long time from the dyeing of cotton to the sale in the market of products such as woven or knitted products, and during that time, the tendency of colors may change, which may not meet the needs of the market.

In addition, indigo dyeing uses 300 woven warp threads.
Approximately 600 strands are made into a rope shape and multiple ropes are run in parallel for continuous dyeing, so lots per color are large, cost is high for small lots, and thread breakage occurs in the case of thin yarns. It was difficult to dye the fine yarn.
Further, when used as a commercial product, since the dyeing has a larger adhesion than the dyeing, the dyeing fastness is low, and the colors fall off during processing, and it is difficult to produce an arbitrary color.

Spec dyeing is a technique in which long fibers and spun yarns are made into a string-like yarn bundle and partially dyed in two or more colors.
Small yarn production is possible because the yarn wound in cheese is dyed into a bundle of yarns, and the yarns in the bundle of yarns are wound into a cone, but it is possible to produce in small lots, but this is disadvantageous in terms of cost and cost. It was Further, the biggest drawback is that the uniformity is remarkably lacked due to the unevenness of dyeing between the dots, the reproducibility for each batch is poor, and there are many knots, resulting in poor quality when used as a woven or knitted fabric.

According to the present invention, the above-mentioned drawbacks are obtained by subjecting a long-fiber additional twisted yarn and a spun ground twisted yarn made of cellulosic fibers to additional twisting in the twisting direction, dyeing the additional twisted yarn and then untwisting. It is a technical object to provide a method for producing a spot dyed yarn that solves the above problem and a woven or knitted product using this yarn.

[0007]

The gist of the present invention will be described with reference to the accompanying drawings.

A long-fiber additional twisted yarn and a spun ground twisted yarn made of cellulosic fibers are additionally twisted in a predetermined twisting number in a twisting direction, and the additional twisted yarn is dyed into a cheese shape and dyed in the opposite direction to the above-mentioned twisting direction. The present invention relates to a method for producing a spot dyed yarn of a cellulosic fiber, which comprises untwisting in a predetermined number of twists.

Further, the present invention relates to a woven or knitted fabric characterized by forming a woven or knitted fabric using the yarn according to claim 1.

[0010]

[Function] A long fiber post-twisted yarn and a spun ground twisted yarn made of cellulosic fibers are twisted in a twisting direction at a predetermined twisting number, and then the twisted yarn is dyed into a cheese shape and dyed into a fiber of the yarn at the time of dyeing. Swelling occurs, the surface of the yarn is deeply dyed a by the dye, and the inside of the yarn is lightly dyed b toward the inside because the yarn is twisted.

When the yarn is untwisted in a direction opposite to the additional twisting direction at a predetermined untwisting number, the light dyeing b portion inside the yarn appears at random on the surface of the yarn, and the dark dyeing a is formed on the yarn surface. A spot dyed yarn is produced in which the portion and the portion of the light dyeing b are almost uniformly mixed and expressed.

When the yarn is woven and knitted, and desizing, bioprocessing, and softening are performed to make a woven or knitted product, a portion strongly dyed a and a portion lightly dyed b are formed on the surface. Almost evenly mixed and mixed into a spot-dyed woven or knitted fabric.

[0013]

Example A long-fiber additional twisted yarn and a spun ground twisted yarn made of cellulosic fibers are additionally twisted in a predetermined twisting number in a twisting direction. The inventor conducted an experiment on the number of additional twists with a long-fiber additional twist yarn and a spun ground twist yarn composed of a large number of cellulosic fibers, and set a twisting range to 10600 <K ₁ <36000 where K ₁ = √D × TD = Processed denier T = The number of twists (the number of ground twists + the number of additional twists) T / m was found to be optimal, and when the additional twisted yarns were dyed into a shape, the fibers of the yarns were dyed during dyeing. Swelling occurs, the surface of the yarn is deeply dyed a by the dye, and the inside of the yarn is further twisted. This yarn is untwisted in the direction opposite to the additional twisting direction, and the twisting number T after untwisting is √D × number of ground twists <K ₂ <27,000 K ₂ = √D × TD = processed denier T = after untwisting When the yarn is untwisted within the range of the number of twists T / m 2, the light-dyeing b inside the yarn appears randomly on the surface of the yarn, and a part dyed deeply a and a part light-dyed b are formed on the yarn surface. Threads are formed that are almost evenly mixed and are very similar to spot dyeing.

According to the experiment, the larger the number of twists after untwisting, the longer the deep-dyeing a part of this spot dyed yarn is, and the smaller the number of twists after untwisting is, the shorter the deep-dyeing a part is. It was confirmed that the expression of the woven or knitted fabric can be changed by selecting the values of K ₁ and K ₂ according to the market demand.

[0015] Further, a cellulosic fibrous fiber No. 20 single yarn (266 denier) and a yarn of spun ground twist Z550T / m are twisted to Z1600T / m, and cheese dyeing is carried out with a reactive dye, and then S1200T / m. Untwisted.

This yarn was used as a warp yarn, and weft was combined with white yarn of No. 20 single yarn to produce a woven fabric. The standard is weaving 3/1 denim with greige warp yarn density 40 yarns / cm, weft yarn density 29 yarns / cm, de-sizing, bio-processing, softening,
Finished with a fresh density of 45 pieces / cm and a horizontal density of 31 pieces / cm.

As a result, a woven fabric with a naturally flowing expression peculiar to the cellulose fibers and having a good feel is obtained. The surface of this woven fabric is uniformly filled with a portion dyed deeply a and a portion dyed light b. A high quality fabric was obtained which was very close to the mixed spot dyeing.

[0018]

As described above, according to the present invention, a long-fiber post-twisted yarn and a spun ground twisted yarn made of cellulosic fibers are twisted in a twisting direction at a predetermined twist number, and the twisted yarn is dyed into a cheese shape. However, since it is untwisted with a predetermined number of twists in the direction opposite to the above-mentioned additional twisting direction, it is possible to dye any color with a small rod as compared to the conventional yarn dyeing method with top dyeing that has a large lot and there is a prospective risk. Therefore, it is possible to produce spot-dyed yarn in the color desired by the user.

Further, in comparison with the conventional thread dyeing method by indigo dyeing, which has a large lot per one time and has more adhesion than dyeing of dye, the dyeing fastness is low, as compared with the conventional thread dyeing method by indigo dyeing. Since the dyeing time was kept long by the dip dyeing method, there was no loss of color after processing and the surface dyeing fastness was remarkably improved. In addition, compared to spec dyeing, which uses yarns in a weave-like yarn bundle and dyes them partially, this dyeing method saves cost because the process is shortened because it is cheese dyeing, and the biggest problem with spec dyeing is weaving. This is a method for producing an excellent spot dyeing yarn of cellulosic fibers in which the uniformity leading to the defects of the knitted fabric is significantly improved.

Further, when a woven or knitted product is produced by using the above yarns for weaving and knitting, desizing, bioprocessing, and softening, a dyeing fastness of any color suitable for the user's needs is obtained even with a small rod. A high-quality woven and knitted fabric is obtained, and a woven and knitted fabric with a look that naturally flows with a high quality that is extremely close to spot dyeing in which the deeply dyed part and the lightly dyed part are almost evenly mixed and mixed. can get.

[Brief description of drawings]

FIG. 1 is a front view of a part of a spun ground twisted yarn made of cellulosic fiber.

FIG. 2 is a front view of a part of a yarn in which the yarn is further twisted in a twisting direction to form a cheese and dyed.

FIG. 3 is a front view of a part of a yarn obtained by untwisting the above with a predetermined number of twists in a direction opposite to the additional twisting direction.

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[Procedure amendment]

[Submission date] July 14, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

Example A long-fiber additional twisted yarn and a spun ground twisted yarn made of cellulosic fibers are additionally twisted in a predetermined twisting number in a twisting direction. The inventor conducted an experiment on the number of additional twists with a long-fiber additional twist yarn and a spun ground twist yarn composed of a large number of cellulosic fibers, and set a twisting range to 10600 <K ₁ <36000 where K ₁ = √D × TD = Processed denier T = The number of twists (the number of ground twists + the number of additional twists) T / m was found to be optimal, and when these additional twisted yarns were dyed into cheese, the fibers of the yarns were dyed during dyeing. Swelling occurs, and the surface of the yarn is deeply dyed a by the dye, and the inside of the yarn is further twisted.
This yarn is untwisted in the direction opposite to the additional twisting direction, and the number of twists T after untwisting is T
Is untwisted within a range of √D × number of ground twists <K ₂ <27,000 K ₂ = √D × TD = processed denier T = number of twists T / m after untwisting, the light dyeing b inside the yarn Appearing at random on the surface of the yarn, and the portion dyed a and the portion dyed light b on the surface of the yarn are almost uniformly mixed and expressed, and a yarn very similar to spot dyeing is generated.

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Claims (2)

[Claims] 1. A long-fiber additional twisted yarn and a spun ground twisted yarn composed of cellulosic fibers are twisted in a predetermined twisting number in a twisting direction, and the twisted yarn is dyed into a cheese shape and dyed in the twisting direction. Is a process for producing a spot-dyed yarn of cellulose fibers, which comprises untwisting a predetermined number of times in the opposite direction. 2. A woven or knitted fabric formed by using the yarn according to claim 1 to form a woven or knitted fabric.