JP2003313741A - Composite false-twist yarn and woven/knitted fabric and sewn product with worn-out appearance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite false-twist yarn of a polyester fiber capable of expressing naturally uneven appearance, worn-out appearance and color fading naturalness each as a characteristic inherent in denim-toned products and dungaree shirts, to provide a woven/knitted fabric comprising the same, and to provide a sewn product with worn-out appearance comprising the fabric. <P>SOLUTION: The composite false-twist textured yarn is obtained by using (A) polyester multifilaments consisting of the polyester sheath/core-type uneven conjugate fiber, wherein a single filament is 0.35-0.95 in unevenness in terms of cross-section ratio α and composed of two kinds of polyesters as the sheath and core differing in dyeability from each other and (B) polyester multifilaments consisting of the polyester same in dyeability as the polyester constituting the sheath. The woven/knitted fabric comprises the composite false-twist textured yarns. The sewn product is obtained by subjecting a sewn product made from the woven/knitted fabric to alkali reduction processing. <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 composite false-twisted yarn and a woven / knitted product made of polyester fiber and a sewn product having a worn appearance, which can express a natural mottled appearance, worn appearance, and natural discoloration. .

[0002]

2. Description of the Related Art Conventionally, denim products made of natural fibers, dungarees shirts and the like have been accepted by a wide age group due to their unique worn appearance and natural discoloration. These worn-out appearances and natural discoloration are part of the fabric being partially whitened by the washing process called stone wash and repeated wear and washing by consumers,
Is what you get.

On the other hand, a textile product made of polyester has an advantage that it does not fade when washed, but it usually has a problem that it is difficult to express its appearance and natural color fading.

For this reason, an attempt has been proposed, for example, in Japanese Patent Application Laid-Open No. 7-173766, in which a textile product made of polyester is provided with an appearance and natural color fading. In such a method, a cloth is formed by using a sheath core type composite fiber having a core portion having a lighter color or a non-stained dull luster than the sheath portion, and the cloth is whitened by alkali reduction processing.

However, although such a method makes it possible to partially whiten the cloth, the cloth as a whole is uniformly whitened, giving a natural mottled appearance which is a characteristic of denim-like products and dungaree shirts. It is not possible to fully express the worn appearance and naturalness of discoloration,
The solution was desired.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. The problem is to provide a natural spotted appearance and worn-out appearance that are characteristic of denim-like products and dungarees shirts. An object of the present invention is to provide a composite false-twisted yarn and a woven / knitted product made of polyester fiber capable of expressing the appearance and naturalness of discoloration, and a sewn product having a worn appearance.

[0007]

Means for Solving the Problems As a result of intensive studies to achieve the above-mentioned objects, the present inventors have found that the sheath portion and the core portion have different dyeability from each other and have a specific thickness ratio. Polyester multifilament composed of polyester sheath core type thick and thin composite fiber made of polyester,
A composite false twisting yarn and a woven or knitted fabric and a sewn product having a worn appearance can be obtained by simultaneously performing a composite false twisting process on the polyester forming the sheath portion and the polyester multifilament made of polyester having the same dyeability. The present invention was conceived by knowing the above and further earnestly studying.

Thus, according to the present invention, "the filament has a thickness of 0.35 to 0.95 in a cross-sectional area ratio α of 0.35 to 0.95, and the sheath portion and the core portion are dyeable with each other. A polyester multifilament (A), which is a polyester sheath-core type thick and thin composite fiber made of different polyesters, and a polyester multifilament (B) made of polyester having the same dyeability as the polyester forming the sheath portion are combined. A composite false-twisted yarn characterized by being false-twisted is provided.

At this time, the composite false-twisted yarn has a core-sheath structure portion in which the polyester multifilament (A) is located in the sheath portion and the polyester multifilament (B) is located in the core portion, It is preferable that the polyester multifilament (A) and the polyester multifilament (B) have alignment structure portions aligned with each other while being mixed with each other. Further, the sheath portion is made of cationic dyeable polyester,
On the other hand, it is preferable that the core part is made of cationic non-staining polyester. Further, in the above polyester-based sheath core type thick and thin composite fiber, a single or a plurality of core portions are present, and a cross sectional area ratio β between the sheath cross sectional area and the core cross sectional total area is 0.1 to 1.0. It is preferable.

Further, according to the present invention, there is provided "a woven or knitted fabric characterized by containing at least the above-described composite false twisted yarn".

At this time, it is preferable that the sheath portion is partially removed and the core portion is exposed at least in the thick portion of the polyester sheath core type thick and thin composite fiber.

Further, according to the present invention, "a sewn product obtained by sewing using at least the above-mentioned woven or knitted fabric, and after the sewn product, the convex portion or the edge portion of the sewn product is selectively subjected to alkali reduction processing. A sewn product having a worn-out appearance, which is characterized by being provided with.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. First, in one polyester multi-filament (A) that constitutes the composite false twisted yarn of the present invention, the filament (single yarn fiber) has a sheath portion (sheath portion) and a core portion (core portion) that have dyeability with each other. It consists of different polyester sheath core type composite fibers. The polyester forming the polyester sheath-core type composite fiber may be a known polyester represented by polyethylene terephthalate or polytrimethylene terephthalate or a modified polyester, but the sheath portion and the core portion need to have different dyeability.

Here, different dyeability means, for example,
(A) If the sheath portion is cation-dyeable, the core portion is cation-unstainable, and conversely, (a) if the sheath portion is cation-unstained, the core portion is cation-dyeable. . In the present invention, either case (a) or (a) may be used, but in order to obtain the worn appearance described below,
(A) It is preferable that the sheath portion is cation-dyeable and the core portion is cation-unstained. Such cationic dyes
It is obtained by a conventional metal-sulfonate isophthalic acid-modified polyester or the like.

The sheath portion and / or the core portion may be treated with a matting agent or alkali to reduce the weight.
A micropore (or microgroove) forming agent that forms micropores or microgrooves may be contained on the fiber surface or inside the fiber. In particular, it is preferable that the core portion contains inorganic fine particles such as titanium oxide so as to have semi-dull gloss or dull gloss.

The sheath core type referred to in the present invention may be a single core type as illustrated in FIG. 1 or a multi-core type as illustrated in FIG. Also, the center (concentric)
The single core type may be used, or the eccentric (eccentric) single core type may be used. Further, even if a part of the core is exposed on the surface, it does not matter as long as it is within the range in which worn and appearance is not spoiled, which is one of the main purposes of the present invention. Among them, the positive core single core type or the multi core type is preferable in consideration of stability and reproducibility in mass production.

The cross-sectional area ratio β of the cross-sectional area of the sheath portion and the total cross-sectional area of the core portion is preferably 0.1 to 1.0 (more preferably 0.1 to 0.5). Here, the cross-sectional area ratio β is represented by the following formula. β = (sheath section cross-sectional area) / (total cross-sectional area of core section) However, the sheath section cross-sectional area is obtained by removing the cross-sectional area of the core section from the cross-sectional area of the composite fiber (filament).
When the core portion is a multi-core type, the total cross-sectional area of the cross-section of the core portion is the sum of the cross-sectional areas of the core portions.

If the cross-sectional area β is smaller than 0.1, there is a risk that the stability of yarn production will be impaired. On the contrary, the cross-sectional area β
Is greater than 1.0, the yarn strength may be reduced after the weight reduction processing described below is performed.

In the above-mentioned composite fiber, the cross-sectional shape of the composite fiber and the cross-sectional shape of the core portion are round, triangular, square, flat,
An arbitrary shape such as hollow is selected. The cross-sectional shape of the composite fiber and the cross-sectional shape of the core portion may be the same,
It may be different.

Next, the above-mentioned conjugate fiber has a thick and thin sectional area ratio α of 0.35 to 0.95 (preferably 0.5 to 0.5) in the yarn length direction.
It must have a thickness of 0.8). Here, the thick and thin sectional area ratio α is expressed by the following equation. α = (detailed cross-sectional area) / (thick cross-sectional area) However, the cross-section is cut perpendicularly to the fiber axis direction, the cross section is observed with an electron microscope, the cross-sectional area is measured at n number 20, and the average value is shown.

If the thick and thin cross-sectional area ratio α is less than 0.35, the yarn strength may be reduced, which is not preferable. On the other hand, when the ratio of the thick and thin cross-sectional areas α is larger than 0.95, the natural mottled appearance which is one of the main objects of the present invention cannot be obtained, which is not preferable.

In the above-mentioned composite fiber, the length of the thick part is 5 to 170 mm (more preferably 8 to 130 m).
m), the length of detail is 5 to 170 mm (more preferably 8
˜130 mm) is preferred.

The thick and thin fibers can be obtained by ordinary uneven stretching in which the unstretched polyester yarn is spun or once wound and then stretched at a low ratio and heat-treated. The thick yarn may be a so-called thick and thin yarn, or may be the dispersed uneven stretched yarn described in, for example, Japanese Patent Publication No. 3-79450. In such thick thin yarns, the thick portion usually has low orientation and high elongation, while the fine portion has high orientation and low elongation.

In the present invention, the polyester multifilament (A) is composed of a filament composed of the above-described polyester sheath core type conjugate fiber. The total fineness, single yarn fineness, and number of filaments of the polyester multifilament (A) are not particularly limited, but are 30 to 300 dtex and 0.6 to 10 d in terms of texture and productivity, respectively.
The range of 10 to 50 tex is preferable. The average elongation of the polyester multifilament (A) is preferably 80 to 220% (more preferably 120 to 180%) in order to obtain the core-sheath structure described below. The polyester multifilament (A) is a long fiber (multifilament) in obtaining a composite false twisted yarn described below.
And short fibers are not preferred.

Next, the other polyester multifilament (B) which constitutes the composite false twisted yarn of the present invention needs to be formed of polyester having the same dyeability as the sheath portion of the polyester multifilament (A). There is. For example, if the sheath portion is cation-dyeable, the polyester multifilament (B) must be cation-dyeable. Conversely, if the sheath portion is cation-unstained, the polyester multifilament (B) is also cation-dyeable. Must be dyeable. Above all, it is preferable that both the sheath portion and the polyester multifilament (B) are cationically dyeable in order to obtain the worn-out appearance described later.

The polyester forming the polyester multifilament (B) is not particularly limited as long as it has the same dyeability as the sheath portion, but the same polyester as the sheath portion is preferably used. Also,
As the additive, those described above can be used as appropriate.

The polyester multifilament (B)
The total fineness, single yarn fineness, and number of filaments are not particularly limited, but are 30 to 300 dt in terms of texture and productivity, respectively.
The range of ex, 0.6 to 10 dtex, and 10 to 50 lines is preferable. Further, the polyester multifilament (B) is preferably a drawn yarn having an elongation of 5 to 50% (more preferably 20 to 40%) in obtaining the core-sheath structure described later. The polyester multifilament (B) needs to be long fibers (multifilaments) in order to obtain a composite false twisted yarn described later, and short fibers are not preferable.

Next, the composite false twisted yarn of the present invention is obtained by subjecting the above-mentioned polyester multifilament (A) and polyester multifilament (B) to the composite false twist process.

As the composite false twisting process, for example, the polyester multifilament (A) and the polyester multifilament (B) are aligned and the first roller is set at a temperature of 90 to 220 ° C. (more preferably 100 to 19).
An example is a method of twisting by a twisting device via a heat treatment heater at 0 ° C.

At this time, air entanglement (interlace processing or Taslan processing) is applied before or after the first roller before false twisting in order to impart tieability to the composite false twisted yarn and improve handleability. It is preferable. Such air entanglement may be applied after the false twisting process and before winding.

The draw ratio during false twisting is 0.8 to
The range of 1.5 is preferable, and the false twist number is the false twist number (T / m).
= (32500 / √Dtex) × α
It is preferably 0.5 to 1.5, and usually 0.8 to 1.2. As a twisting device to be used, a disc type or belt type friction type twisting device is suitable for easy threading and less yarn breakage, but a pin type twisting device may be used.

The uneven stretching and the composite false twisting are as follows.
It may be performed in a series of steps or may be performed in another step.

In the composite false twisted yarn of the present invention, the fineness ratio (DA) of the fineness DA of the polyester multifilament (A) and the fineness DB of the polyester multifilament (B)
/ DB) is not particularly limited, but a range of 0.2 to 3.0 (more preferably 0.5 to 1.5) is suitable. It should be noted that the composite false twisted yarn of the present invention contains other yarns as long as it is within a range that does not impair the natural mottled appearance, worn appearance, and natural color fading which are the main objects of the present invention. But it doesn't matter.

In the composite false twisted yarn of the present invention, the polyester multifilament (A) is located in the sheath portion, while the polyester multifilament (B) is provided.
It is better to have a core-sheath structure part located in the core part and a aligning structure part in which the polyester multifilament (A) and the polyester multifilament (B) are aligned while being mixed with each other. It is preferable for obtaining a mottled appearance. The lengths of the core-sheath structure part and the alignment structure part are 5 to 170 mm (more preferably 8 to 130 mm) respectively, and the alignment structure parts 5 to 17 are respectively.
It is preferably 0 mm (more preferably 8 to 130 mm). The mixed fiber form of the core-sheath structure part and the draw-alignment structure part is schematically shown in FIG.

If the elongation of the thick part of the polyester multifilament (A) is higher than that of the polyester multifilament (B), the polyester multifilament (A) is located in the sheath part. A highly crimped core-sheath structure part in which the polyester multifilament (B) is located in the core part is formed. When the sheath portion of the polyester multifilament (A) (polyester sheath core type thick and thin composite fiber) is cationically dyeable, the thick portion has a thick sheath portion and a low orientation when dyed with a cationic dye. Because of this, it is dyed in a dark color.

On the other hand, if the fineness of the polyester multifilament (A) is about the same as that of the polyester multifilament (B), the polyester multifilament (A) and the polyester multifilament (B) are mixed with each other. A low crimped and aligned structure is formed which is aligned with each other. When the sheath portion of the polyester multifilament (A) (polyester sheath core type thick and thin composite fiber) is cationically dyeable, when dyed with a cationic dye, the details are such that the sheath portion is thin and highly oriented. Therefore, it is dyed in a light color.

In the false twist composite yarn having the core-sheath structure part and the draw-align structure part, the average elongation of the polyester multifilament (A) and the elongation of the polyester multifilament (B) are within the above ranges. Can be obtained by appropriately selecting the conditions for the composite false twisting within the above range.

The false-twisted composite yarn of the present invention has a shade difference due to the thickness of the sheath-core type composite fiber, and a mottled appearance obtained by subjecting different multi-filaments having specific dyeability to the false-twist processing. There is. Further, when the core-sheath structure part and the draw-aligned structure part are provided, the color change due to the change in the mixed fiber form of the polyester multifilament (A) and the polyester multifilament (B) composed of the sheath core type thick and thin composite fibers It also has changes and changes in the degree of crimping, resulting in a better natural mottled appearance.

Next, according to the present invention, there is provided a woven or knitted fabric containing at least (preferably 30% by weight or more) the above-described composite false twisted yarn. here,
The composite false twisted yarn may be used alone or after being made into a composite yarn with other fibers (polyester fiber, nylon fiber, natural fiber, etc.), and if necessary, yarns such as textured yarn, spun yarn, twisted yarn and the like. In other words, it is in the form of a cloth such as a woven / knitted fabric or a non-woven fabric which is a known fiber aggregate. As the woven structure of the woven fabric, a plain weave, a twill weave, a satin weave, or a modified structure thereof is preferably used. In knitting, any of circular knitting such as smooth, weft knitting and warp knitting can be used. Since the composite false-twisted yarn has a natural mottled appearance as described above, a woven or knitted article using at least such a composite false-twisted yarn has a natural mottled appearance even before being subjected to alkali reduction processing. It has an appearance.

Further, by subjecting the woven or knitted fabric to alkali reduction processing, the thick portion (low orientation portion) of the polyester type sheath core type thick and thin conjugate fiber is selected as compared with the detail (high orientation portion) of the conjugate fiber. Be reduced. As a result, the sheath portion is partially removed in the thick portion, and the core portion is exposed. That is, when dyed only with a cationic dye, the portion that was a dark color portion before the alkali weight loss turned white due to the alkali weight loss. As a result, in addition to the natural mottled appearance, the worn and discolored appearance is added.

It is preferable that the alkali reduction processing is carried out in the usual manner before the dyeing processing step. Further, the reduction rate of the alkali weight loss can be appropriately selected depending on the cross-sectional area ratio between the sheath portion and the core portion of the sheath core type composite fiber so that the core portion is partially exposed, and is particularly limited. Not a thing. By setting the weight reduction rate, it is possible to freely express a desired mottled appearance, worn-out appearance, and discolored appearance.

Next, at least the woven or knitted material is used to form a sewn product, and convex portions and edge portions of the sewn product are selectively alkali-reduced to obtain a sewn product having a worn-out appearance. Here, "selective" means that the weight reduction rate of the convex portion or the edge portion is higher than that of other portions, and it does not matter even if the entire sewn product is weight-reduced. The woven or knitted fabric before sewing may be subjected to weight reduction processing, but it is preferable that the weight reduction processing is not performed. The convex portion and the edge portion of the sewn product referred to here are the seam portion of the sewn product, the periphery of the seam portion, the belt loop portion, and the like.

As a method for selectively subjecting the convex portion or the edge portion of the sewn product to alkali weight reduction processing, a plurality of sewn products are simultaneously charged or stones for rubbing are sewn in the conventional alkali weight reduction processing method. An example of the method of charging with the product is illustrated.

By subjecting the sewn product to the weight reduction processing, the sewn product can be worn and have an appearance and a natural discoloration. As a result, such a sewn product has a natural spotted appearance, worn-out appearance, and natural discoloration, which are features of denim-like products and dungarees shirts.

The dye for dyeing the woven or knitted fabric and the sewn product of the present invention is not particularly limited and can be arbitrarily selected. For example, if only cationic dyes are used, a natural mottled appearance, worn-out appearance, and natural appearance of discoloration can be obtained.If a disperse dye of a color different from that of the cationic dye is used together with the cationic dye, exposure due to alkali weight loss will occur. A colorful appearance is obtained in which only the color of the core part changes. Such dyeing processing may be performed before sewing or after sewing.

[0046]

EXAMPLES Examples and comparative examples of the present invention will be described in detail below, but the present invention is not limited thereto.

[Example 1] First, a modified polyethylene terephthalate polymer prepared by copolymerizing 2.6 mol% of 5-sodium sulfoisophthalic acid, which is a cationic dyeing agent, was used as a sheath portion, and on the other hand, a normal cation having a dull luster. Using a non-staining polyethylene terephthalate polymer (titanium oxide content of 2.5% by weight) as a core portion, a normal conjugate cross-section form (cross-sectional area ratio β = 0 .25) of polyester sheath core type composite fiber undrawn yarn 145 dtex / 36 fil was obtained.

On the other hand, a polyester multifilament (B) was drawn by a conventional spinning and drawing method using a modified polyethylene terephthalate polymer obtained by copolymerizing 2.6 mol% of 5-sodium sulfoisophthalic acid which is a cationic dyeing agent. Thread 84dtex / 24fil (elongation 30%)
Got

Next, the polyester sheath core type composite fiber undrawn yarn 145 dtex / 36 fil is subjected to a conventional thick and thin process to obtain 125 dtex / 36 fil of polyester multifilament (A) (average elongation 1
40%, the ratio of the thick and thin sectional areas α = 0.64, the length of the thick portion 10
~ 80mm, length of detail 10 ~ 60mm),
After the polyester multifilament (A) and the polyester multifilament (B) are aligned and subjected to interlace processing, a conventional compound false twisting process (disk type twisting device, heat setting temperature 160 ° C., draw ratio 1 0.0, false twist number 2100 T / m) was performed to obtain a composite false twisted yarn. The obtained composite false twisted yarn has a core-sheath structure part (1
3 to 80 mm) and an alignment structure part (10 to 60 mm). The thick and thin processing and the composite false twist processing were performed in a series of steps.

Next, the composite false twisted yarn is used as a warp yarn and a weft yarn to produce a woven or knitted fabric having a plain structure (C) (warp density 1
49 lines / 3.79 cm, weft density 103 lines / 3.79 c
m) was obtained.

The woven fabric (C) was subjected to a conventional dyeing process without being subjected to the alkali weight reduction process. Such a woven fabric combines the dark and light unevenness due to the thickness of the sheath core type thick and thin composite fiber, the color change due to the change of the mixed fiber form of the polyester multifilament (A) and the polyester multifilament (B), and the change of the crimping degree. The cloth had a natural mottled appearance.

Further, the woven fabric (C) is subjected to alkali weight reduction processing (weight reduction rate of 9%) to expose the core portion in the thick portion of the polyester sheath core type thick and thin composite fiber, and then the conventional dyeing processing. When applied, the resulting woven fabric had not only a natural mottled appearance, but also a natural worn appearance and a natural discoloration.

Further, a sewn product is made by using the woven fabric (C), and a stone for rubbing is put into the sewn product together with the sewn product, and alkali weight reduction processing (weight reduction rate 5%) is applied to the sewn product. The convex portion and the edge portion of the product were selectively alkali weight-reduced. Then, when the dyeing process of the alkali reduction treatment is applied to the sewn product by a conventional method, the sewn product is
Not only the natural mottled appearance, but also a full-fledged worn appearance,
It had a natural discoloration.

[Example 2] Example 2 was the same as Example 1 except that the polys multifilament (A) was subjected to thick and thin processing at the spinning stage, which was a separate process from the composite false twisting process. Similarly, a composite false twist textured yarn was obtained. The obtained composite false twisted yarn has a core-sheath structure part (12
˜100 mm) and the alignment structure (15 to 80 mm).

Then, the composite false twisted yarn is used as a warp yarn and a weft yarn to form a woven or knitted fabric having a flat structure (D) (warp density 1
49 lines / 3.79 cm, weft density 103 lines / 3.79 c
m) was obtained.

The woven fabric (D) was subjected to a conventional dyeing process without being subjected to the alkali reduction process. Such a woven fabric combines the dark and light unevenness due to the thickness of the sheath core type thick and thin composite fiber, the color change due to the change of the mixed fiber form of the polyester multifilament (A) and the polyester multifilament (B), and the change of the crimping degree. The cloth had a natural mottled appearance.

Further, the woven fabric (D) is subjected to alkali weight reduction processing (weight reduction ratio 9%) to expose the core portion in the thick portion of the polyester sheath core type thick and thin composite fiber, and then the conventional dyeing processing is performed. When applied, the resulting woven fabric had not only a natural mottled appearance, but also a natural worn appearance and a natural discoloration.

Further, a sewn product is made by using the woven fabric (D), and a stone for rubbing is put into the sewn product together with the sewn product, and alkali weight reduction processing (weight reduction rate 5%) is applied to the sewn product. The convex portion and the edge portion of the product were selectively alkali reduced. Then, when the alkali-reduced sewn product was subjected to a conventional dyeing process, the sewn product had not only a natural mottled appearance, but also a full-fledged worn appearance and natural discoloration. It was

[Example 3] In Example 1, the core portion was formed of an ordinary cationic non-staining polyethylene terephthalate polymer having a semi-dull luster (content of titanium oxide: 0.4% by weight), and as shown in FIG. Composite false twisted yarn in the same manner as in Example 1 except that the polyester multifilament (A) is composed of a polyester sheath core type composite fiber having a multicore cross-sectional shape (cross-sectional area ratio β = 0.43) as illustrated. Got The obtained composite false twisted yarn has a core-sheath structure part (9 to 90 mm) and a draw-aligned structure part (10 to 50 m).
m).

Then, the composite false-twisted yarn is used as a warp yarn and a weft yarn, and as a woven or knitted fabric, a plain weave fabric (E) (warp density 1
49 lines / 3.79 cm, weft density 103 lines / 3.79 c
m) was obtained.

The woven fabric (E) was subjected to a conventional dyeing process without being subjected to an alkali weight reduction process. Such a woven fabric combines the dark and light unevenness due to the thickness of the sheath core type thick and thin composite fiber, the color change due to the change of the mixed fiber form of the polyester multifilament (A) and the polyester multifilament (B), and the change of the crimping degree. The cloth had a natural mottled appearance.

Further, the woven fabric (E) is subjected to alkali weight reduction processing (weight reduction rate of 9%) to expose the core portion in the thick portion of the polyester sheath core type thick and thin composite fiber, and then a conventional dyeing processing is performed. When applied, the obtained woven fabric had not only a natural mottled appearance, but also a natural worn appearance and a natural discoloration.

Further, a sewn product is made by using the woven fabric (E), and a stone for rubbing is put into the sewn product together with the sewn product to carry out alkali weight reduction processing (weight reduction rate of 5%), whereby the sewn product is sewn. The convex portion and the edge portion of the product were selectively alkali reduced. Then, when the alkali-reduced sewn product was subjected to a conventional dyeing process, the sewn product had not only a natural mottled appearance, but also a real worn-out appearance and natural discoloration. It was

[Comparative Example 1] In Example 1, as the polyester multifilament (A), a polyester comprising a modified polyethylene terephthalate polymer obtained by copolymerizing 2.6 mol% of 5-sodium sulfoisophthalic acid which is a cationic dyeing agent. Undrawn yarn 145 dtex / 36
A composite false-twisted yarn and a woven fabric were obtained in the same manner as in Example 1 except that the fil was subjected to thick and thin processing.

Although the polyester multifilament (A) was thick and thin, there was no shade of light and shade, and the obtained woven fabric did not have a natural uneven appearance.

Moreover, even if such a woven fabric was subjected to alkali reduction processing, it was not possible to express a natural worn-out appearance and a natural discoloration.

Further, a sewn product was made using the above-mentioned woven fabric which was not subjected to alkali weight reduction processing, and alkali weight reduction processing was applied in the same manner as in Example 1. Could not be expressed.

Comparative Example 2 A composite false twisted yarn and a woven fabric were obtained in the same manner as in Example 1 except that the polyester multifilament (A) was not subjected to thick and thin processing. .

Since the polyester multifilament (A) did not have thick, thin, and light shades, the obtained woven fabric did not have a natural uneven appearance.

Even when such a woven fabric was subjected to alkali reduction processing, the whole woven fabric was whitened, and it was not possible to express a natural worn-out appearance and a natural discoloration.

Further, a sewn product was made by using the above-mentioned woven fabric which was not subjected to the alkali weight reduction processing, and the alkali weight reduction processing was applied in the same manner as in Example 1. Could not be expressed.

Comparative Example 3 A false twisted yarn and a woven fabric were obtained by using only the polyester multifilament (A) alone in Example 1 without using the polyester multifilament (B).

Although the polyester multifilament (A) had thick and thin and light and dark color spots, there was no change in the crimped form, so the obtained woven fabric did not have a natural spotted appearance.

When alkali reduction processing is applied to such a woven fabric, the thick part of the multifilament (A) is selectively whitened to give an artificial appearance, which gives a natural worn-out appearance and a natural discoloration. I couldn't.

Furthermore, a sewn product was made using the above-mentioned woven fabric which was not subjected to alkali weight reduction processing, and alkali weight reduction processing was applied in the same manner as in Example 1. Could not be expressed.

[0076]

EFFECT OF THE INVENTION According to the present invention, a composite false twisted yarn and a woven / knitted product made of a polyester fiber, which can express the natural mottled appearance, worn-out appearance, and natural discoloration, which are features of denim preparations and dungarees, etc. It is possible to obtain a sewn product that is worn and has an appearance.

[Brief description of drawings]

FIG. 1 schematically shows a cross section of a single-core type composite fiber which can be used in the present invention.

FIG. 2 is a schematic view showing a cross section of a multi-core type composite fiber that can be used in the present invention.

FIG. 3 (1) is a schematic view of a core-sheath structure portion. (2) It is a schematic view of the alignment structure portion.

[Explanation of symbols]

1 Sheath part 2 core parts 3 Sheath part 4-1 Core part 4-2 Core part 5 Polyester multifilament (A) 6 Polyester multifilament (B)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) D03D 15/00 D03D 15/00 J D06M 11/38 D06M 23/14 23/14 101: 32 // D06M 101 : 32 9/02 C (72) Inventor Masahiro Higaki 77 Kitayoshida-cho, Matsuyama-shi, Ehime Prefecture F-Term (Reference) 4L031 AA18 AB07 AB08 AB27 AB32 AB33 CA01 DA00 DA01 DA09 4L036 MA05 MA16 MA33 MA39 PA05 PA46 RA25 UA12 UA16 4L041 BA02 BA05 BA21 BA52 BD13 BD14 CA06 CA12 DD09 DD21 EE15 EE20 4L048 AA20 AA27 AA28 AB07 AB16 AB18 AC07 DA02 DA03 EB04

Claims (7)

[Claims] 1. A polyester comprising a filament having a thickness in the yarn length direction of 0.35 to 0.95 in a cross-sectional area ratio α of 0.35 to 0.95, and a sheath portion and a core portion having different dyeability from each other. Polyester multifilament (A), which is a sheath-core type thick and thin composite fiber, and polyester multifilament (B), which is made of polyester having the same dyeability as the polyester forming the sheath portion, are subjected to composite false twisting. A composite false twisted yarn characterized by: 2. A composite false-twisted yarn, wherein the polyester multifilament (A) is located in the sheath portion, while the polyester multifilament (B) is located in the core portion, and the polyester multifilament. The composite false twisted yarn according to claim 1, wherein the filament (A) and the polyester multifilament (B) have a draw-aligning structure part in which they are aligned while being mixed with each other. 3. The composite false twisted yarn according to claim 1 or 2, wherein the sheath portion is made of cationic dyeable polyester, and the core portion is made of cationic dyeable polyester. 4. In the polyester sheath core type thick and thin composite fiber, a single core or a plurality of cores are present, and a cross-sectional area ratio β of the cross-sectional area of the sheath and the total cross-sectional area of the core is 0.1 to 0.1.
The composite false twisted yarn according to any one of claims 1 to 3, which is 1.0. 5. A woven or knitted fabric comprising at least the composite false twisted yarn according to any one of claims 1 to 4. 6. The woven or knitted fabric according to claim 5, wherein the sheath portion is partially removed and the core portion is exposed at least in the thick portion of the polyester sheath core type thick and thin composite fiber. 7. A sewn product obtained by sewing using at least the woven or knitted fabric according to claim 5 or 6, wherein a convex portion or an edge portion of the sewn product is selectively alkali-reduced after being sewn. A sewn product that has a worn-out appearance and is characterized by being processed.