JPH0457932A - Coarse-fine yarn having modified cross section and plural hollows prepared from single yarn - Google Patents

Abstract

PURPOSE:To obtain the title coarse-fine yarn excellent in gloss, feeling and light-weight properties, consisting of plural single yarns with nearly a rectangular appearance form wherein the single yarn satisfies specific conditions in the cross section and the prepared coarse-fine yarn has plural hollow parts and coarse parts continued along longitudinal direction. CONSTITUTION:A single yarn drawn from an undrawn yarn or semi-undrawn yarn package 1 is wound around a feed roller 2 and a drawing roller 4 each several times, and then drawn through a friction resisting body 3 and wound as a winding body 5 to provide the objective yarn. The cross section of the single yarn satisfies formula I, II, and III wherein L1 in the formula is length between side end parts of opposite two sides; L2 is length between center parts of opposite two sides and in the formula II, l1 is length between side end parts of opposite other two sides; l2 is length between center parts of opposite other two sides. The prepared yarn has a cross section of a nearly rectangular shape, having >=5 continuous hollow parts (b) in a polymer part (a) along the longitudinal direction of fiber and further having >=15/m coarse parts in the longitudinal direction of the prepared coarse-fine yarn.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a novel porous, hollow, thick yarn with an irregular cross section that exhibits excellent gloss, feel and lightness when made into a fabric. .

(Prior Art) Numerous proposals and efforts have been made to make synthetic fibers closer to the texture of natural fibers while maintaining the original characteristics of synthetic fibers.

As one of these methods, it is known that the non-uniformity of natural fibers can be applied to synthetic fibers. Specifically, the appearance and texture of natural fibers can be obtained by providing thicker parts in the longitudinal direction of the yarn.

As a means for obtaining such yarns, in the step of drawing undrawn yarn or semi-undrawn yarn obtained by spinning,
By setting the drawing temperature below the glass transition point of the fiber, setting the drawing ratio within the natural drawing ratio of the fiber, and by bringing it into contact with a frictional resistor in the drawing area, it is possible to A method of leaving an unstretched portion or a semi-unstretched portion is widely known.

A woven or knitted fabric made of yarn obtained by such a method has a texture with an uneven feel due to the nine portions of thick fineness and fine fineness.

However, woven and knitted fabrics made of such threads can be said to be similar to woven and knitted fabrics made of natural fibers in terms of their uneven texture, but they lack luster.

It is not completely satisfactory in terms of lightness, dryness, and crispness.

On the other hand, in recent years, due to the emphasis on bi-functionality and high value-added properties, single yarns with irregular cross-sections are used to improve the sliminess and gloss characteristic of synthetic fibers, and hollow fibers are used to add lightness. There have been proposals for fibers with a modified cross-sectional shape, and also with a porous hollow modified cross-sectional shape in which a plurality of hollow portions are divided and scattered in the cross section of the fiber, with the aim of improving flatness resistance.
It is hard to say that it is practically satisfactory.

For example, the present inventors previously proposed in Japanese Patent Laid-Open No. 62-45717 a thick and thin yarn with an irregular cross section that can impart a supple dry feel and lightweight feel, as well as a crisp and uneven feel to the fabric. However, the lightweight feeling of the front 8 threads is.

This can be achieved by regulating the cross-sectional shape of the fibers and increasing the porosity of the fabric, and there has also been a demand for improvements in lightness.

Furthermore, as shown in FIG. 4(a), the yarn proposed in JP-A-54-50620 has a triangular cross section and a rounded shape, resulting in gloss and a dry feel.

It lacks texture, etc., and also has a small number of hollow parts, so
It is also inferior in terms of lightness.

Furthermore, the yarn obtained from the spinneret described in JP-A-55-142710 has a rectangular cross section with little roundness as a whole, as shown in FIG. Although it was excellent in terms of texture, it had a small number of hollow parts and was not satisfactory in terms of lightness.

(Problems to be Solved by the Invention) The present invention has been made in view of this situation, and provides a fabric with mild gloss and a dry feel.

Furthermore, it is a technical problem to provide a hollow, thick, thin filament with irregular cross-sections that can impart a crisp feel, an uneven feel, and lightness.

(Means for Solving the Problems) The present inventors have arrived at the present invention as a result of intensive studies aimed at solving the above problems.

That is, the present invention provides a thick and thin yarn consisting of a plurality of single yarns, in which the cross section of the single yarns has the following formulas (I), (n), and (
It has a substantially rectangular external shape that satisfies III).

The fiber has five or more hollow parts continuous along the length direction of the fiber, and further, the yarn has one hollow part in the length direction of the fiber.
The gist of the present invention is a hollow, thick and thin yarn with irregular cross-section and porous holes, which is characterized by having 5 or more large-fineness portions/m.

0.6≦L! /L, ≦1.1 (I)0.
6≦12/ l r≦1.1 (II) 0
．． 25≦L+/i+≦4 (■) Ll: Length between the side edges of the two opposing sides L2 = Length between the transparent parts of the two opposing sides iI: Side edges of the other two opposing sides Length between 12: The length between the transparent parts on the other two opposing sides is 1 based on the 9 drawings.
The present invention will be described in detail.

FIGS. 1(a) to 1(f) are schematic cross-sectional views showing examples of single yarns having irregular cross-sections, porous holes, thick and thin yarns according to the present invention, and FIGS.
FIGS. 2(a) to 2(f) are plan views showing examples of orifices for spinning the single yarn shown in FIG. 1.

First about the characteristics of the irregular cross-section porous hollow thick thin filament of the present invention
This will be explained in detail using FIG. 2(a) as a representative example.

In FIG. 1(a), the cross section of the single yarn has a substantially rectangular external shape, and has five or more hollow portions (b) in the polymer portion (a). (This representative example has nine hollow parts.) As an important element constituting the present invention, the polymer part (a)
The deformation ratio of the outer periphery of this is.

When yarn is made into fabric, it has a mild luster, a dry feel,
It greatly contributes to the crisp feel, and also affects the deformation of the cross section of the fiber and the collapse of the hollow part due to external pressure.

In the present invention, the length between the edge parts of two opposing sides,
and the length between the transparent part (L 2 / L +) and the ratio of the length it between the edge parts of the other two opposing sides and the length 12 between the central part (f 2 / A,) needs to be 0.6 to 1.1. L 2/ L + or I12/ l
If I is less than 0.6, the deformation ratio becomes large, and fabrics using such single yarns may become irritated on the surface or become hollow due to external pressure during weaving, knitting, crimping, etc. Collapse and flattening of the area occur. In addition, when L2/L or 12/l r exceeds 1.1, the cross-sectional shape of the fiber becomes too round, so when such yarn is made into fabric, the bending stress decreases and the fabric becomes stiff. It disappears and wears out. Furthermore, the gloss, dry feel, texture, etc. are also unattractive.

Also, the vertical and horizontal deformation ratio t/i+ of the approximately rectangular shape is.

0.25≦L, /1. It needs to be ≦4. because.

If L, /It, is outside this range, the fiber cross-sectional shape will be too flat even if L, /L, and f2#l satisfy 0.6 to 1.1, so the same applies as above.

This is because the deformation of the fiber cross section and the collapse of the hollow portion become noticeable during the weaving, knitting, crimping, etc. stages.

The hollow portion of the present invention has irregular cross-section porous hollow thick threads.

Requires 5 or more. If the number of hollow portions is less than 5, the lightweight property will not be satisfied. Even if the hollowness ratio (the ratio of the area of each hollow part to the cross-sectional area of the fiber) of each hollow part in the single yarn is increased in order to satisfy the lightweight property,
In the post-processing stage, the hollow portion is crushed and deformed, resulting in a reduction in light weight and the resulting product being of poor quality.

Further, the total hollowness in the cross section of the single yarn of the present invention (total hollowness of each hollow part) is preferably 10% or more in order to impart lightness to the resulting product.

On the other hand, in order to prevent hollow cracks and flattening, it is preferably 65% or less.

Furthermore, the present invention has a modified cross-section porous hollow thick thin filament.

It is necessary for the yarn to have 15 or more thick portions/m in the length direction. If the number of thick parts is less than 15/m,
The large fineness portions are very sparsely dispersed, and when made into a fabric, the pattern becomes uneven due to the presence of a small amount of large fineness portions, resulting in a significantly degraded quality. Also, when you run this fabric over your fingertips, it feels like a foreign body.

Undesirable.

On the other hand, if the number of thick areas is 15/m or more, when made into a fabric, a uniform pattern can be obtained due to the presence of appropriate thick areas, resulting in an excellent texture of one quality.

Note that the yarn of the present invention is produced as a multifilament yarn consisting of a plurality of single yarns, and in any cross section of the yarn, even if all the single yarns have a large fineness portion or only one yarn has a large fineness. Although the effect of the present invention can be achieved even if only the single yarn in the section has a large fineness section, it is better to have thick sections and fineness sections randomly, so that extreme unevenness in fineness does not occur and it is difficult to weave. This is more preferable since it is possible to minimize the occurrence of troubles in the knitting process or the preparatory process.

In addition, the present invention has a modified cross-section porous hollow thick thread.

After crimping or weaving, alkali reduction processing or the like may be performed. In the crimping process, the fibers are subjected to a strong external force by the crimping device, so in conventional porous hollow fibers, the cross section of the fiber tends to deform and the hollow part collapses. The fibers are less likely to be deformed or crushed than conventional porous hollow fibers. Also, when applying alkali weight reduction processing.

It is preferable to design the position and hollow ratio of the hollow part in consideration of the weight loss rate. Furthermore, it is preferable that the thick part has heat resistance and chemical resistance.9For example, in the spinning process, the yarn is wound at high speed and is made from semi-undrawn yarn that has been highly oriented in advance. Preferably, fine threads are produced.

FIG. 3 schematically shows an example of a drawing machine for obtaining thick and thin filaments. The yarn pulled out from the undrawn yarn or semi-undrawn yarn package 1 is wound around a supply roller 2 and a stretching roller 4 several times each, and then stretched through a frictional resistor 3.
It is wound up as a winding body (burn) 5.

The dimensions of the orifice used to spin single fibers, shown in Figures 2(a) to (0), vary depending on various manufacturing conditions such as the discharge rate during spinning, the spinning temperature, and the cooling solidification conditions. Since the surface shape changes, it may be selected appropriately.

In the present invention, the target polymer may be any spinnable polymer, but melt-spun polymers are particularly preferably used. Examples of such polymers include polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyolefins such as polyethylene and polypropylene, nylon 6, and nylon 6.
Examples include polyamides such as No. 6 and copolymers and polymer mixtures mainly composed of these polyamides. For example, in the polyester, less than 15 mol% of other components 2 such as 5-sodium sulfoisophthalic acid, isophthalic acid, adipic acid, diethylene glycol, polyethylene glycol, polyoxyalkylene glycol, etc. may be copolymerized. . In addition, matting agents, antistatic agents, flame retardants,
It may contain additives such as pigments.

Note that the number of thick fineness portions in the present invention is defined as follows.

A yarn with a large fineness part present in 9 parts in the length direction of the yarn was tested using an Evens tester made by Keizai Kogyo at a yarn speed of 8 m/min, a chart speed of 0.25 m/min, and a sensitivity of ±50%. Measure the thickness unevenness of 8m of yarn, and compare it to the base waveform.
The number of peaks exceeding 0% is counted and converted to the number of thick parts per lrn.

Further, the cross-sectional shape ratio of the fibers and the hollowness ratio of the hollow portions were measured by measuring the fineness portion of the obtained thick and thin filaments using an image processing device using a microscope.

(Example) Next, two embodiments of the present invention will be specifically explained using examples.

Example 1 and Comparative Examples Polyethylene terephthalate (containing 0.05% by weight of titanium dioxide) having an intrinsic viscosity of 0.65 was spun at a temperature of 290°C using a spinneret having 36 orifices having the shape shown in Fig. 2. , melt spinning at a discharge rate of 33.0 g/min, winding at a speed of 3000 m/min, cross-sectional shape,
Undrawn yarns with different hollow ratios were collected.

The obtained undrawn yarn was drawn using a drawing machine shown in FIG. 3 at a supply roller temperature of 80° C. and a drawing ratio of 1.35 times.

A yarn of 75 denier/36 filaments was obtained. At this point, there was almost no deformation of the cross-sectional shape of the fibers and almost no collapse of the hollow portions.

Next, the obtained threads are used as warp and weft threads, and are woven into a double-layer structure, and the resulting fabric is subjected to post-processes such as scouring, presetting, alkali reduction, and dyeing, to produce plain dyed fabrics of the same color. I got it.

About this fabric: Shiny, lightweight, and dry.

Regarding staining spots, deformation of fiber cross section, and collapse of hollow parts,
The evaluation results are shown in Table 1.

In addition to the above-mentioned items, the overall evaluation took into account the natural appearance and unevenness.

Table 1 - Evaluation method A: Very good, B Good, C + Phoenix, go to Umbrella L2 Shidai - Example 2 Test N, which received an extremely good evaluation in Example 1
Using the semi-undrawn yarn used in α1-2, among the stretching conditions, the cylindrical frictional resistor and the stretching roller 4 in the stretching region
By changing the distance between the two yarns, yarns with different numbers of fineness parts were obtained.

The obtained yarn was woven and post-processed in the same manner as in Example 1.

Table 2 shows the results of evaluation in the same manner as described above for the plain-dyed Habutae fabrics obtained.

Not T0 As is clear from Table 2, patterns 2-3 are uneven.

The natural appearance was somewhat unsatisfactory, and when the fabric was rubbed with a fingertip, it felt like a foreign body, and the subtle unevenness was lacking.

(Effects of the Invention) The irregular cross-section porous hollow thick thin yarn of the present invention has a substantially rectangular cross-sectional shape that satisfies the above formulas (I), (n), and (I). Can impart mild gloss and dry feel. Furthermore, since porous hollow portions exist continuously in the fiber length direction within the single filament, it is extremely lightweight. In addition, since the yarn has a thick part of 15 pieces/m or more in the length direction, it has a natural appearance and a subtle uneven feel, and is particularly suitable as a material for midsummer.

[Brief explanation of drawings]

FIGS. 1(a) to 1(f) are schematic cross-sectional views showing an example of a monofilament of irregular cross-section porous, hollow, thick and thin yarns according to the present invention,
21st! l (a) to (f) are respectively shown in Figure 1 (a)
) to (f) are plan views showing examples of orifices for spinning single yarns; FIG. 3 is a schematic diagram of a drawing device for producing thick and thin threads of the present invention. Figure 4(a),
(b) is. FIG. 2 is a schematic cross-sectional view showing an example of a conventional monofilament with irregular cross-section, porous, hollow, thick and thin filaments. Patent applicant Nihon Ester Co., Ltd.

Claims (1)

[Claims] (1) A thick and thin yarn consisting of a plurality of single yarns, in which the cross section of the single yarn has a substantially rectangular external shape that satisfies the following formulas (I), (II), and (III). , and has 5 or more hollow parts continuous along the length direction of the fiber, and further, the yarn has 15 or more thick parts/m in the length direction of the yarn. Features a unique cross-section of porous, hollow, thick and thin filaments. 0.6≦L_2/L_1≦1.1 (I) 0.6≦l_2/l_1≦1.1 (II) 0.25≦L_1/l_1≦4 (III) L_1: Edges of two opposing sides Length L_2: Length between the center parts of two opposing sides l_1: Length between the edge parts of the other two opposing sides l_2: Length between the center parts of the other two opposing sides (2) The irregular cross-section porous hollow thick thin filament according to claim 1, wherein the total hollowness ratio in the cross section of the single filament is 10 to 65%.