JP2003253554A - Method for producing cotton-like polyester-based fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a cotton-like polyester-based fabric having a soft touch. <P>SOLUTION: A polyester-based fabric containing ≥10 wt.% polyester multifilaments (A) is subjected to a caustic reduction treatment of ≥10% to dissolve the thick parts of the filaments and to cause a nap on the surface of the fabric. The polyester multifilament is a thick and thin yarn having thick parts and thin parts in ≥1.2 ratio of diameters of the thick part to the thin part, and 1-5 dtex filament size. <P>COPYRIGHT: (C)2003,JPO

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 cotton-like polyester cloth having a soft touch texture.

[0002]

2. Description of the Related Art Conventionally, various methods have been used to obtain a cotton-like cloth made of polyester long fibers.
For example, there is a method in which a bulky spun-like processed yarn such as a composite false twisted textured yarn or a Taslan textured yarn is produced by using two types of yarns and the textured yarn is knitted. However, although the woven or knitted fabric obtained by this method gives a bulky feel, it has no fluff on the surface and is far from a cotton-like appearance and feel.

As a method for improving this, it has been proposed to subject a woven or knitted fabric to a raised fabric with a needle cloth or emery paper. (For example, JP-A-57-210063) However, when surface fluff is caused to occur on the surface of a woven or knitted fabric by such a physical raising process, the surface fluff is hard and the cotton-like appearance and feel are It was far from there, and there was a desire to solve it.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and its object is to provide a method for producing a cotton-like polyester cloth having a soft touch texture. The purpose is to

[0005]

Means for Solving the Problems As a result of intensive studies to achieve the above-mentioned objects, the inventors of the present invention have found that multifilaments having a thick portion and a fine portion with a predetermined thickness ratio and having a predetermined fineness are used. After forming a filament and forming a cloth using such a multifilament, the cloth is subjected to a predetermined alkali weight reduction process, the thick portion of the filament is melted, and fluff is generated on the surface of the cloth to obtain a desired softness. The present invention has been accomplished by finding that a cotton-like polyester cloth having a touch feeling can be obtained.

Thus, according to the present invention, "10 wt% of the polyester multifilament (A), in which the filament is a thick and thin yarn having a thick and thin ratio of 1.2 or more, and the filament fineness (single yarn fineness) is 1 to 5 dtex % Of a polyester-based fabric is subjected to an alkali weight reduction process of 10% or more to dissolve the thick part of the filament to cause fuzz on the surface of the fabric to produce a cotton-like polyester-based fabric. Is provided.

At this time, it is preferable that the polyester multifilament (A) is dispersed and stretched, and the elongation of the polyester multifilament (A) is 15 to 50%.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. First, the polyester forming the polyester multifilament (A) used in the present invention is mainly intended for polyethylene terephthalate having ethylene terephthalate as a repeating unit, but if necessary, a small amount of the third component (usually all repeating units is used). Based on 15 mol% or less, preferably 10 mol% or less, particularly preferably 5 mol% or less) may be a copolymerized polyethylene terephthalate-based copolyester, and also contains a matting agent and other additives. You may have. In particular, when a fine pore (or fine groove) forming agent for forming fine pores or fine grooves is contained on the fiber surface or inside the fiber by alkali reduction treatment, the fine pores or fine grooves are formed. According to this, various effects such as water absorption, natural silk texture, sharpness, and dry touch can be exhibited, which is preferable.

For example, when the sulfonic acid metal salt represented by the following general formula is contained as the fine pore forming agent,
It is more preferable because the dry feeling is improved and the performance more similar to cotton can be obtained.

[0010]

[Chemical 2]

In the formula, M and M'are metals, preferably alkali metals, alkaline earth metals, manganese, cobalt and zinc, and M and M'may be the same or different. R
Is a hydrogen atom or an ester-forming functional group, and n is 1 or 2.

As the sulfonic acid metal salt, for example, those described in Japanese Patent Publication No. 61-31231 are preferably used. Specifically, sodium 3-carbomethoxybenzenesulfonate-5-carboxylate, 3
There may be mentioned sodium hydroxyethoxycarbonylbenzenesulfonate and 1/2 magnesium 5-carboxylic acid.

The sulfonic acid metal salt may be added to the polyester at any stage before melt-spinning the polyester. For example, the sulfonic acid metal salt may be added to the raw material of the polyester, or may be added during the synthesis of the polyester. May be.
If the amount of the above compound added is small, the cotton-like feel of the finally obtained polyester-based fabric may be deteriorated. On the other hand, if the amount added is large, problems may easily occur during spinning. A range of 0.5 to 2.5% by weight, particularly 0.6 to 1.2% by weight is suitable.

Next, the filament constituting the polyester multifilament (A) has a thick portion and a fine portion. At that time, the ratio of the average yarn diameter of the thick portion to the average yarn diameter of the fine portion (thick portion average yarn diameter / detail average yarn diameter) is 1.
It must be 2 or more (preferably 1.4 or more and 6.0 or less). In addition, the average yarn diameter of the thick portion and the average yarn diameter of the detail are the thickness and the detail of the filament (single yarn fiber), cut perpendicularly to the fiber axis direction, and observing the cross section with an electron microscope.
The diameter of the filament (corresponding to a perfect circle) was measured at 20 cross sections and expressed as an average value. Further, in the present invention, (thick average yarn diameter / detail average yarn diameter) is defined as a thick / fine ratio. If the thickness ratio is less than 1.2, the thick portion will not be dissolved and surface fluff will not be generated even if the alkaline reduction processing described below is applied, which is not preferable. Also, the thickness of the thick part of the filament is 0.8-
20 mm (more preferably 1 to 10 mm) is suitable.

Further, the filament fineness (single yarn fiber fineness) of the filaments that compose the polyester multifilament (A) is 1 to 5 dt, averaging thick and thin in the length direction.
It should be ex (preferably 1.5 to 3.0 dtex). If the filament fineness is thicker than 5 dtex, the thick portion will not be dissolved and surface fluff will not be generated even if the alkaline reduction treatment described below is applied, which is not preferable. On the contrary, if the filament fineness is smaller than 1 dtex, pilling is likely to occur, which is not preferable. Moreover, the total fineness of the polyester multifilament (A) is not particularly limited, and a range of 40 to 170 dtex is suitable.

The polyester multifilament (A) is obtained by a method in which undrawn polyester yarn is drawn at a low ratio and heat-treated. The polyester multifilament (A) may be one generally called thick and thin yarn, but is preferably dispersed and drawn. Here, the dispersive drawing is a drawing mode in which, when drawing the polyester undrawn yarn, the drawing points are not concentrated on the entire yarn (each filament acts independently). By such dispersive drawing, each filament (single fiber) independently causes necking at its most suitable position, so that the position varies in a probabilistic manner, and thus the spots occurring in each filament are dispersed not as a group but as a group. . As a result, the sufficiently stretched detail and the incompletely stretched or unstretched thick portion are adjacent to each other, and the elongation can be made equal to that of the ordinary stretched yarn. The elongation is 15 to 50%
(More preferably 20 to 34%) is suitable.

The polyester multifilament (A) described above can be easily obtained, for example, by the method described in Japanese Patent Publication No. 3-79450.

That is, the spinning speed is 2000 m / min or less.
Birefringence 13 × 10 spun below ^-3Below, the amount of oil
(OPU) 0.7% or less of polyester undrawn yarn,
0.2cN / dtex (0.2g / d) or more, 1.0c
Squeeze under tension of N / dtex (1.0 g / d) or less
The unstretched yarn of the unstretched yarn is opened while maintaining the opened state.
Concentrated stress and concentration during stretching at a ratio below the natural stretching ratio
Glass transition temperature + 55 ° C throughout without heating
While heating at the above temperature, uneven stretching and winding
You get more. As such a squeezing method, for example,
Zigzag the drawn yarn between the rods of alumina oxide and squeeze
A method is illustrated. Also, monofilament between drawing and winding
It is preferable to provide 40 or more entanglements between them.

The polyester cloth used in the present invention contains 10% by weight of the polyester multifilament (A).
It is necessary to contain the above (preferably 20 wt% or more). If the proportion is lower than 10 wt%, the soft touch texture, which is the main object of the present invention, cannot be obtained, which is not preferable. The polyester multifilament (A) is a long fiber or a composite yarn with other fibers (polyester fiber, nylon fiber, natural fiber, etc.), and if necessary, processed yarn, spun yarn, twisted yarn, etc. And a woven or 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 circular knitted fabric such as smooth, weft knitted fabric or warp knitted fabric can be used. Further, in the case of a non-woven fabric, it may be a non-woven fabric composed of long fibers or a short fiber.

In the present invention, it is necessary to subject the polyester-based cloth to alkali weight reduction processing at a weight reduction rate of 10% or more (preferably 12 to 20%). The weight loss rate is 10%
If it is lower than the above range, satisfactory surface fluff cannot be obtained, which is not preferable. On the other hand, if the weight loss rate is higher than 20%, the fluff of the surface fluff becomes long, so that pilling may occur, and the fiber strength may decrease, and the commercial value may be lost. As the alkali weight reduction process, a conventional method can be used, and the heat treatment can be performed after the relaxed heat treatment of the polyester cloth or at the same time. By subjecting the alkali weight loss processing at the weight loss rate, cracks occur in the unstretched or incompletely stretched thick portion,
The thick portion is dissolved. As a result, surface fluff is generated on the surface of the fabric, and the appearance of the cotton-like fabric is exhibited. And, unlike the surface fluff obtained by a physical raising process, such a surface fluff gives a texture close to that of cotton.

The cotton-like polyester cloth obtained by the production method of the present invention is usually a final product after being subjected to a conventional dyeing process.

[0022]

EXAMPLES Examples and comparative examples of the present invention will be described in detail below, but the present invention is not limited thereto.
Each measurement item in the examples was measured by the following method. <Strength and Elongation> Tensile strength (cN / dtex) and elongation (%) were measured according to JIS-L1013.

<Fiber Strength Retention Ratio> Fibers were sampled from the cloth after the alkali weight reduction processing, and the tensile strength (cN / dtex) was measured according to JIS-L1013, and calculated by the following formula. Fiber strength retention rate (%) = (tensile strength of fibers taken out from the cloth) / (tensile strength of fibers before the construction of the cloth) ×
100

<Evaluation of surface fluff> The appearance of surface fluff on the surface of the fabric was visually evaluated and evaluated in four levels. “Long fluff on the entire surface of the fabric” is indicated by ⊚, “Generated on the entire surface of the fabric” is indicated by ◯, “Partially generated on the fabric surface” is indicated by Δ, and “No fuzz on the fabric surface” is indicated by X.

<Evaluation of texture> Three testers performed sensory evaluation on softness and evaluated it in four levels. "Excellent" is ◎, "Excellent" is ○, "Normal" is △,
"Inferior" was indicated by x.

[Example 1] Micropore forming agent (3-carbomethoxybenzenesulfonic acid Na-5-carboxylic acid N
A fiber-forming polymer containing polyethylene terephthalate having an intrinsic viscosity of 0.64, to which a) was added by 0.75% by weight, as a main repeating unit was spun at 1270 m / min,
An undrawn yarn of 195 dtex / 36 fil with birefringence = 8 × 10 ⁻³ , natural draw ratio = 2.6, glass transition temperature = 67 ° C., and subjected to oiling of OPU = 0.4% and wound up. . Next, 0.5 cN / dt was applied to the undrawn yarn.
While applying a tension of ex (0.5 g / d), let it zigzag between the rods of alumina oxide having a diameter of 5 mm to make it iron, and then preheat it with a hot roller at 50 ° C. in a squeezed state and then make a flat surface. Stretching at a draw ratio of 2.5 times on a heating plate of 160 ° C. having a temperature of 10 ° C. while rubbing straight without rubbing,
The polyester multifilament (A) of 8 dtex / 36 fil was wound up. The tensile strength of the obtained polyester multifilament (A) is 2.2 cN /
The dtex and the elongation were 26.0%. The filament of the polyester multifilament (A) had a thick portion and a fine portion with a thickness ratio of 1.4 (thick portion length 2 mm). The thick-fine ratio and the length of the thick portion are average values.

Next, 28 gauge 3 manufactured by Fukuhara Seiki Co., Ltd.
Using a 3-inch double knitting machine (model: LPJ25), the above polyester multifilament (A) is used as a yarn constituting a knitted fabric, knitting structure smooth (gateing: interlock), knitting step 100 mm (50 wale) I got a good idea of the yarn length when knitting.

A cotton-like polyester cloth was obtained by subjecting the resulting greige to alkali weight reduction processing (weight reduction rate 10%) according to a conventional method to dissolve the thick portion. Table 1 shows the evaluation results of the surface fluff, texture and fiber strength retention of the obtained cloth.

[Example 2] A cotton-like polyester cloth was obtained in the same manner as in Example 1, except that the weight reduction rate in the alkali weight reduction process was changed to 15%. Table 1 shows the evaluation results of the surface fluff, texture and fiber strength retention of the obtained cloth.

Example 3 A cotton-like polyester cloth was obtained in the same manner as in Example 1 except that the weight reduction rate in the alkali weight reduction process was changed to 20%. Table 1 shows the evaluation results of the surface fluff, texture and fiber strength retention of the obtained cloth.

[Example 4] A cotton-like polyester cloth was obtained in the same manner as in Example 1 except that the weight reduction rate in the alkali weight reduction process was changed to 25%. Table 1 shows the evaluation results of the surface fluff, texture and fiber strength retention of the obtained cloth.

[Comparative Example 1] Micropore forming agent (3-carbomethoxybenzenesulfonic acid Na-5-carboxylic acid N
A fiber-forming polymer containing polyethylene terephthalate having an intrinsic viscosity of 0.64, to which 0.75% by weight of a) is added, as a main repeating unit is spun at 1270 m / min to give an undrawn yarn, and OPU = 0.4. % Oiling and wound up. Next, this unstretched yarn was stretched by a conventional stretching process and wound up as a fully stretched yarn of 84 dtex / 36 fil. The fully drawn yarn thus obtained had a tensile strength of 4.1 cN / dtex and an elongation of 38%.

Next, 28 gauge 3 manufactured by Fukuhara Seiki Co., Ltd.
Using a 3-inch double knitting machine (model: LPJ25), the above fully drawn yarn is used as a yarn constituting a knitted fabric, knitting structure smooth (gateing: interlock), knitting step 1
A raw machine of 20 mm (thread length when knitting 50 wales) was obtained.

The resulting greige was subjected to alkali weight loss processing (weight loss rate of 10%) according to a conventional method to obtain a polyester cloth. Table 1 shows the evaluation results of the surface fluff, texture and fiber strength retention of the obtained cloth.

[Comparative Example 2] A polyester cloth was obtained in the same manner as in Example 1 except that the weight reduction rate in the alkali weight reduction process was changed to 15%. Table 1 shows the evaluation results of the surface fluff, texture and fiber strength retention of the obtained cloth.

Comparative Example 3 A polyester cloth was obtained in the same manner as in Example 1 except that the weight reduction rate in the alkali weight reduction process was changed to 20%. Table 1 shows the evaluation results of the surface fluff, texture and fiber strength retention of the obtained cloth.

[Comparative Example 4] A polyester cloth was obtained in the same manner as in Example 1 except that the weight reduction rate in the alkali weight reduction process was changed to 25%. Table 1 shows the evaluation results of the surface fluff, texture and fiber strength retention of the obtained cloth.

[0038]

[Table 1]

[0039]

According to the present invention, a cotton-like polyester cloth having a soft surface fluff and having a soft touch such as cotton can be easily obtained. The resulting cotton-like polyester cloth is suitable for applications such as underwear and polo shirts.

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Claims (4)

[Claims] 1. A filament is a thick and thin yarn having a thick and thin ratio of 1.2 or more, and a filament fineness (single yarn fineness) of 1 to 1.
Add 1 to a polyester cloth containing 10 wt% or more of 5 dtex polyester multifilament (A).
A method for producing a cotton-like polyester cloth, characterized in that a thick portion of the filament is dissolved to cause fluff on the cloth surface by applying an alkali reduction treatment of 0% or more. 2. A polyester multifilament (A)
Is dispersed and stretched, and the elongation of the polyester multifilament (A) is 15 to 50%. 3. Polyester multifilament (A)
Wherein the polyester contains a micropore-forming agent in the polyester.
Alternatively, the method for producing the cotton-like polyester cloth according to claim 2. 4. The method for producing a cotton-like polyester cloth according to claim 3, wherein the micropore-forming agent is a metal salt compound represented by the following general formula. [Chemical 1] In the formula, M and M ′ are metals, R is a hydrogen atom or an ester-forming functional group, and n is 1 or 2.