JP2000178843A - Blended yarn comprising polyester multi-filament having excellent water absorbability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a blended yarn having excellent water absorbability and useful for woven or knitted fabrics having excellent soft touches, draping property, tension and stiffness. SOLUTION: This blended yarn having water absorbability comprises (A) polyester multifilaments which extend on a dry thermal treatment at 160 deg.C and (B) polyester multifilaments which shrink on the dry thermal treatment at 160 deg.C. The polyester multifilaments A in the blended yarn have fine grooves in the direction rectangular to the filament axes. The blended yarn, and a woven fabric using the blended yarns as warps and/or wefts satisfy the following relationships. (The blended yarn); the single filament fineness of the polyester multifilaments A: 0.2 to 1.0 denier, SHD (A)<0%, 40%>=SHD(B)>=5%, and 45%>SHD(B)-SHD(A)>=5%. (The woven fabric); the number of the single filaments of the polyester multifilaments A occupying the warp: 5,000-30,000 filaments/cm. Therein, SHD(A), SHD(B) are the shrinkage degrees of the polyester multifilaments (A) and (B), respectively, on the dry thermal treatment at 160 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester multifilament mixed yarn containing a spontaneously elongated yarn, and more particularly to an excellent dryness and moderate softness due to weight loss by alkali and excellent water absorption. The present invention relates to a polyester multifilament mixed yarn.

[0002]

2. Description of the Related Art Conventionally, attempts to impart water absorbency to a woven or knitted fabric include (a) a method of combining a surface modifier having a hydrophilic group on the surface of a woven or knitted fabric by using a pad dry cure method or the like (b). Surface modification by post-processing such as a method of making the surface hydrophilic by graft-polymerizing a monomer having a hydrophilic group and a polymer having a polyester on the polyester has been dominant. However, although these methods do provide excellent water absorption performance, they are expensive in order to hydrophilize the fiber surface by post-processing, and simply use a surface modifying material having a hydrophilizing group as shown in (a). Those applied to the surface have problems in washing durability and do not always satisfy consumers.

Further, as a method not using the above-mentioned post-processing, (c) a method of utilizing a capillary phenomenon between fibers by making the fiber cross section into a special shape or hollow, and (d) Japanese Patent Laid-Open No. 5-16 / 1990.
As disclosed in Japanese Patent No. 3611, there is a method of improving water absorption by the effect of a hollow portion and a fine groove with a hollow cross-section thick and thin yarn. However, in the method (c), the number of twists is limited in order to obtain satisfactory water absorption performance because the gap between the fibers is used. In the method (d), the tear strength of the woven or knitted fabric is not satisfactory. A pill is formed due to insufficient mechanical strength of the yarn, resulting in an undesirable appearance quality.

On the other hand, a technique has been proposed in which a polyester multifilament is composed of two or more components and a spontaneously elongated yarn is used for at least one component in order to impart a soft feeling, a swelling feeling and a bulkiness to the woven fabric. With these techniques, a soft feeling, a swelling feeling, and a bulky feeling, which cannot be realized by the conventional different shrinkage mixed fiber yarn, can be obtained. In addition, by making the single yarn denier of the spontaneously elongated yarn thinner, a woven fabric having a more excellent softness can be obtained. However, a slimy feeling peculiar to ultrafine yarn is exhibited together with a soft feeling, and in a woven fabric, this slimy feeling is disliked by consumers. At present, there is no product which has a soft feeling and a slimy feeling, that is, a dry feeling, which is a woven fabric using ultrafine yarn.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the conventional problems, to simultaneously satisfy the softness and dryness that could not be achieved conventionally, and to obtain a blend of polyester multifilaments excellent in water absorption. It is to obtain a yarn.

[0006]

The present invention has the following configuration to solve the above-mentioned problems. That is, the present invention provides a polyester multifilament blend comprising a polyester multifilament (A) whose yarn is elongated by heat treatment at 160 ° C dry heat and a polyester multifilament (B) whose yarn shrinks by heat treatment at 160 ° C dry heat. A woven fabric using at least a warp and / or a weft yarn, wherein the polyester multifilament (A) has fine grooves in a direction perpendicular to the fiber axis, and the polyester multifilament mixed yarn and the woven fabric are as follows: Is a mixed fiber comprising polyester multifilaments having excellent water absorption, characterized by satisfying the following formula: (Mixed yarn) Single yarn denier of polyester multifilament (A): 0.2 or more and 1.0 or less SHD (A) <0% 40% ≧ SHD (B) ≧ 5% 45% ≧ SHD (B) -SHD (A) ≧ 5% (woven fabric) The number of single yarns of polyester multifilament (A) occupied in the warp 5,000 or more and 30,000 or less yarn / cm. However, SHD (A) and SHD (B) are each polyester multifilament (A) 3) shows the shrinkage ratio of (B) at 160 ° C. in dry heat.

Specifically, the denier of the single yarn of the polyester multifilament (B) is 2 to 9 denier, and the depth of the fine groove extending in the direction perpendicular to the fiber axis of the polyester multifilament (A) is the single yarn diameter. 5% of
Less than 50%, the number of which is 3 to 10 per 10μ, and the ratio of the polyester multifilament (A) in the polyester multifilament mixed yarn is 30% or more and less than 50%. It is a mixed fiber.

Hereinafter, the present description will be described in more detail. The polyester multifilament (A) which elongates by the heat treatment at 160 ° C. in the dry heat of the present invention has many fine grooves in a direction perpendicular to the fiber axis direction. These fine grooves are developed by the alkali weight reduction treatment. Regarding the fine grooves described in the direction perpendicular to the longitudinal direction of the yarn, about 5% to 50% of the yarn diameter.
%, And the number is preferably about 3 to 10 per 10 μ. 0 If the fine grooves are too deep, the water absorption performance is improved, but the mechanical strength of the single yarn is reduced and the tear strength of the polyester fabric is reduced. There is a possibility that the quality of the woven fabric will be reduced due to the reduction or the single yarn cutting, and a woven fabric that is satisfactory to consumers cannot be obtained. The same applies to the number,
The effective range for maintaining the tear strength of the polyester fabric and securing the appearance quality of the fabric is about 3 to 10 pieces per 10 μm. More preferably, by controlling the number to 4 to 7 regions, it is possible to obtain a mixed fiber and a woven fabric composed of polyester multifilaments satisfying water absorption performance and having a practically satisfactory dry feeling.

The single yarn denier of the polyester multifilament (A) is preferably from 0.2 to 1.0 denier. This is an important condition for transferring water utilizing the capillary phenomenon and for obtaining a soft feeling and a swollen feeling of the polyester fabric. However, if it is less than 0.2 denier, it becomes impossible to obtain deep fine grooves, so that problems such as a decrease in water absorption performance occur. Conversely, if it exceeds 1.0 denier, the soft feeling and the swelling feeling of the polyester fabric are reduced, the water is not smoothly transferred by the capillary action, and the water absorption is not effectively exhibited.

Next, the polyester multifilament (A) of the present invention preferably has a dry heat shrinkage (SHD) of 0% or less. This is because a good swelling is exhibited as a woven fabric. When the SHD is 0% or more, the woven fabric cannot be given an appropriate softness, swelling, and bulkiness. Also,
The water absorption performance due to the fine grooves generated on the fiber surface is not effectively exhibited. Preferably, the SHD is -2% or less.

On the other hand, the dry heat shrinkage (SHD) of the polyester multifilament (B) of the present invention is preferably 5% or more and 40% or less. If it is less than 5%, the difference in yarn length from the polyester multifilament (A) is small, and a soft feeling is not felt. If it exceeds 40%, the fabric shrinks greatly and the fabric has a coarse and hard feel. More preferably, it is 10% or more and 30% or less.

The difference in dry heat shrinkage (SHD) between the polyester multifilaments (A) and (B) is preferably 5% or more and 45% or less. Polyester multifilament (A)
This is because the fine grooves can effectively exhibit water absorption performance by floating on the surface of the woven fabric, and the softness and swelling of the woven fabric can be obtained.

The number of single yarns of the polyester multifilament (A) occupying the warp and / or the weft constituting the woven fabric is preferably from 1500 / cm to 14500 / CM.
If the number is less than 1500, even if fine grooves are formed on the fiber surface, the water absorption performance by capillary action is not effectively exhibited. On the other hand, when the number exceeds 14,500, the space between the fibers becomes small, and the water transfer is not smooth, and the water absorption performance is reduced.

The single yarn denier of the polyester multifilament (B) is preferably 2 to 9 denier.
Since the single yarn denier of the polyester multifilament (A) is made thinner, the filament (A) alone cannot provide sufficient tension and elasticity. Therefore, it is necessary to impart tension to the woven fabric with the polyester multifilament (B). If the single yarn denier of the polyester multifilament (B) is less than 2 deniers, the tension and elasticity of the woven fabric cannot be obtained. When the denier exceeds 9 denier, the bending rigidity of the woven fabric is increased and the woven fabric feels coarse and hard, and the woven fabric lacks the drape property. Preferably from 3 denier to 7
Less than denier.

The denier ratio of the polyester multifilament (A) in the polyester multifilament mixed yarn is preferably 30% or more and less than 50%. If it is less than 30%, the fabric will be strong and elastic. If it exceeds 50%, the single yarn denier of the polyester multifilament (A) is so thin that loop fuzz or the like is liable to be generated, which causes problems in post-process passability and poor handling. Further, the cutting of single yarn causes a reduction in the appearance quality of the woven fabric and a reduction in tear strength.

The polyester multifilament (A) and the polyester multifilament (B) preferably use an air entanglement means using a high-pressure airflow at normal temperature.
The degree of confounding given by the means is from 20 / m to 100 / m
m is preferable, and within this range, the softness and dryness which are the objects of the present invention can be obtained without concern about problems in the passability and handling in the subsequent steps and without giving a defect called an interlace mark to the woven fabric. Can be obtained.

Next, an example of a production example of the yarn of the present invention will be described. As the polyester multifilaments (A) and (B) of the present invention, multifilament yarns melt-spun by a known method are used, and highly oriented undrawn yarn (POY) is particularly preferable. Subsequently, the POY can be subjected to relaxation heat treatment to impart self-elongation ability, but is not necessarily limited to this. As the polyester multifilament (B), a drawn yarn obtained by drawing the highly oriented undrawn yarn using a drawing machine, a directly drawn yarn drawn by a spin draw method, and the like can be used.

The polyester multifilament referred to in the present invention may be a copolymer polyester such as polyethylene terephthalate and a cationic dye dyeable polyester or a normal pressure cationic dye dyeable polyester.
Further, a matting agent such as titanium oxide or an antistatic agent may be added in a small amount. The cross-sectional shape of the filament constituting the polyester-based composite yarn of the present invention may be an ordinary round cross-section, or any of multi-leaf, polygonal, hollow, flat, and its special modified cross-sections can be applied. Yes, filaments having different cross-sectional shapes may be mixed.

Next, the Larose method for measuring water absorption will be described. Using Toyobo Engineering's Larose water absorption measurement device TL-01 type, set a circular sample of polyester fabric on a hydrated horizontal glass filter,
The amount of water that the sample sucks up through the glass filter in one minute under a load of 480 g was measured on this sample, and the water absorption was calculated by the following formula using the average of the five times of measurement as the amount of water absorption. Water absorption (%) = Water absorption (g) / Sample weight (g) x 1
00

Next, a method of measuring a heat treatment (SHD) at a dry heat of 160 ° C. will be described. (SHD) Approximately 1 m of a sample is collected, a loop is formed, and a mark of 30 cm is made with a glass pencil under a load of 1/30 [g / denier]. The load is removed and the sample is treated in a hot air drier (160 ° C.) for 30 minutes. After the treatment, the sample is taken out, and the length L ₁ cm contracted by applying a load of 1/30 [g / denier] is read. Then, the dry heat shrinkage [SHD] was calculated by the following equation. SHD (%) _{= (L 1/30) ×} 100 However, when the extension was the elongation and (-shd).

Hereinafter, the present invention will be described in more detail based on embodiments. (Example 1) A 30-denier / 48-filament highly oriented undrawn yarn was obtained using a polyethylene terephthalate spinning apparatus. Subsequently, the multifilament yarn was subjected to relaxation heat treatment to obtain a multifilament (A) having an SHD of -4%. On the other hand, SHD is 15% 50 denier /
Using a 12 filament multifilament (B) and an interlacer, a mixed fiber was formed so that the degree of entanglement became 60 strands / m to obtain a 85 denier / 60 filament mixed fiber. Subsequently, after twisting of 1200 T / M of S twist using a double twister, the twisted and twisted product was used as a warp and a weft of a woven fabric, and then woven. The woven fabric was refined and relaxed to a weight loss rate of 20%. Subsequently, dyeing was carried out with a disperse dye using a liquid jet dyeing machine, and a normal final set was performed to obtain a dyed cloth (the number of single yarns of the polyester multifilament (A) in the warp of the dyed cloth was 6311. /
cm). Using a scanning electron microscope, magnification 800
Observation of the surface of the dyed fabric at 2 × revealed that the polyester multifilaments (A) and (B) formed a loop due to a difference in yarn length and effectively covered the woven fabric surface. Further, it was confirmed that a large number of fine grooves extending perpendicular to the fiber axis direction were formed on the surface of the polyester multifilament (A) forming the loop. The maximum depth from the fiber surface to the deepest part of the fine grooves is 25% of the fiber diameter on average, the width is 1.8 μm on average,
The number was 3.2 per 10 μm of yarn length. When the water absorption performance of the dyed cloth was measured by the Larose method, the water absorption was 115%, and it was confirmed that the dyed cloth had excellent water absorption performance. The texture of the dyed cloth was excellent in moderate dryness, softness and swelling due to a large number of fine grooves, and had a completely new texture suitable for women's dresses and jackets.

Comparative Example 1 A dyed cloth was obtained in exactly the same manner as in Example 1, except that the polyester multifilament was stretched first and then subjected to a relaxation heat treatment. When the fabric surface was observed using a scanning electron microscope, loops were effectively present on the fabric surface, but no fine grooves were observed at all.
As a result, although a soft feeling was obtained, the dry feeling was slightly inferior to that of Example 1, and the water absorption was poor due to lack of fine grooves. 0.0%.

Comparative Example 2 A dyed fabric was obtained in exactly the same manner as in Example 1, except that the high-density undrawn yarn of 30 denier / 8 filament was subjected to a relaxation heat treatment. When the fabric surface was observed using an electron electron microscope, loops were effectively present on the fabric surface. However, since the number of single yarns of the polyester multifilament A in the warp was as small as 1052 / cm, it was effectively fine. The water absorption performance by the groove was not exhibited, and the water absorption by the Larose method was 50.0%, which was not satisfactory.

[0024]

[Table 1]

[0025]

According to the present invention, the water absorption is effectively exerted by utilizing the capillary phenomenon caused by the fine grooves and extra-fine threads developed by the alkali weight reduction treatment. It has become possible to obtain a mixed fiber yarn for woven or knitted fabric which has a soft feeling, and is excellent in drape property and tightness and suitable for clothing use.

Continued on the front page F term (reference) 4L036 MA05 MA26 MA33 MA39 PA01 PA21 PA33 PA42 RA03 RA13 UA01 UA30 4L048 AA20 AA21 AA32 AA50 AA54 AB07 AB08 AB09 AB12 AC15 BA02 CA07 CA12 DA02 EB04

Claims (4)

[Claims] 1. A polyester multifilament (A) whose yarn is elongated by heat treatment at a dry heat of 160 ° C .;
A woven fabric using a polyester multifilament mixed fiber comprising polyester multifilament (B) whose yarn shrinks by a heat treatment at 60 ° C. as at least a warp and / or a weft, wherein the polyester multifilament (A) is a fiber axis A mixed fiber comprising polyester multifilament excellent in water absorbency, wherein the mixed fiber has fine grooves in a direction perpendicular to the above and the polyester multifilament mixed yarn and the woven fabric satisfy the following formula. (Mixed yarn) Single yarn denier of polyester multifilament (A): 0.2 or more and 1.0 or less SHD (A) <0% 40% ≧ SHD (B) ≧ 5% 45% ≧ SHD (B) -SHD (A) ≧ 5% (woven fabric) The number of single yarns of the polyester multifilament (A) in the warp 5,000 to 30,000 yarns / cm. However, SHD (A) and SHD (B) are polyester multifilaments (A), respectively. 3) shows the shrinkage ratio of (B) at 160 ° C. in dry heat. 2. Polyester multifilament (B)
2. The polyester multifilament mixed yarn according to claim 1, wherein the single yarn denier has a denier of 2 to 9 denier. 3. Polyester multifilament (A)
The depth of the fine grooves extending in the direction perpendicular to the fiber axis is 5% or more and 50% or less of the single yarn diameter.
The polyester multifilament mixed yarn according to claim 1, wherein the mixed yarn has zero. 4. The polyester multifilament mixed yarn according to claim 1, wherein the denier ratio of the polyester multifilament (A) in the polyester multifilament mixed yarn is 30% or more and less than 50%.