JP3296855B2 - Polyester fabric with spun yarn and hemp-like feel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester hollow fiber blended woven fabric, more particularly, a polyester fabric having a hemp-like feel which has a firm and dry feel and is suitable for producing such a woven fabric. It relates to a spun yarn.

[0002]

2. Description of the Prior Art Hemp or hemp blend fabrics have a unique dry feel, but have the drawback of easily wrinkling. on the other hand,
Polyester fabrics are less likely to wrinkle, but have the sliminess and glare inherent to synthetic fibers. Therefore, by reducing the alkali content of the polyester fabric containing inorganic fine particles in the fiber, fine irregularities are formed on the surface of the polyester yarn, light is irregularly reflected to eliminate glare, and a dry feeling is provided. ing. However, when this fabric is used for general clothing, it has a drawback that it is not tight and easy to set, so that it is impossible at present to meet the demands of diversified and sophisticated consumers.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a hemp-like polyester fabric which has no glare, has a dry touch, and has an excellent tension, and a spun yarn suitable therefor.

[0004]

That is, the present invention comprises 1 to 10% by weight of inorganic fine particles, has a denier of 1.5 to 4 denier, a hollow ratio of 5 to 30%, and a sectional deformation ratio L2 /. L1 (L1 is the major axis of the fiber cross section, L2 is the minor axis of the fiber cross section) is 1 to 0.5, and at least 30% by weight of the polyester hollow fiber exists in a state where at least a part of the inorganic fine particles protrude from the fiber surface The spun yarn and inorganic fine particles containing 1 to 10% by weight are contained, and the single fiber denier is 1.5 to 4%.
Denier, hollow ratio 5-30%, cross-sectional deformation L2 / L1
(L1 is the major axis of the fiber section, L2 is the minor axis of the fiber section) is 1
And a fabric containing 30% by weight or more of polyester hollow fibers having fine irregularities on the fiber surface.

The polyester used in the present invention includes a polymer of terephthalic acid or an ester-forming derivative thereof and ethylene glycol or 1,4-butanediol, that is, polyethylene terephthalate or polybutylene terephthalate, or a copolymer mainly composed of these. Polymers are preferably used. As the copolymerizing acid component, aromatic dicarboxylic acids such as isophthalic acid, sulfoisophthalic acid, 5-sodium sulfoisophthalic acid, diphenyldicarboxylic acid, and naphthalenedicarboxylic acid, oxalic acid, adipic acid, sebacic acid, and aliphatic acids such as dodecanedioic acid Oxycarboxylic acids such as dicarboxylic acid, p-oxybenzoic acid, and p-β-oxyethoxybenzoic acid, and aliphatic diols such as 1,3-propanediol, 1,6-hexanediol and neopentyl glycol as diol components And aromatic diols such as 1,4-bis (β-oxyethoxy) benzene, and polyalkylene glycols such as polyethylene glycol and polybutylene glycol. These third components may be used alone or in combination of two or more.

As inorganic fine particles to be contained in the polyester, any inorganic fine particles which can be reduced with alkali such as titanium dioxide, silicon dioxide, zinc oxide, barium sulfate, zirconium oxide, aluminum oxide, magnesium oxide and calcium carbonate and which can be dispersed in polyester can be used. However, titanium dioxide, silicon dioxide, zinc oxide and barium sulfate are preferred from the viewpoint of good dispersibility in polyester, and titanium dioxide and silicon dioxide are particularly preferred. The average particle diameter of the inorganic fine particles is preferably 1 μm or less, particularly preferably 0.7 μm or less from the viewpoint of dispersibility. In addition, the maximum particle size is preferably 5 μm or less in view of the spinning property, and 3 μm or less.
The following is more preferred. It is desirable that such coarse particles are present in the inorganic fine particles at a ratio of 1% or less, particularly 0.5% or less.

The content of the inorganic fine particles is in the range of 1 to 10% by weight, preferably 2 to 9% by weight, and more preferably 3 to 8% by weight. If it is less than 1% by weight, a dry feeling cannot be obtained satisfactorily when the alkali is reduced. When the content exceeds 10% by weight, the inorganic fine particles are not stably dispersed in the polymer and spinning becomes extremely difficult. As a method for incorporating the inorganic fine particles into the polyester, the polyester may be added to the esterification tank similarly to the mixture (slurry) of terephthalic acid, ethylene glycol, or the like, or may be added before the polycondensation reaction tank. Further, it may be added directly to the polymer, and it is preferable to adopt a method having good dispersibility according to the properties of the inorganic fine particles.

[0008] The polyester hollow fiber used in the present invention is spun using a polyester containing a predetermined amount of the above-mentioned inorganic fine particles using a known hollow fiber spinning apparatus, stretched, crimped, and heat-set to form a square. It can be cut or bias cut into staples and supplied to the spinning process. However, the single fiber denier is preferably in the range of 1.5 to 4.0 denier, and more preferably 2.0 to 3.0 denier. If it is less than 1.5 denier, it will not be tight, and if it exceeds 4.0 denier, it will be hard and the feel will be worse. The cross-sectional shape of the fiber may be a deformed cross-section such as a flat cross-section, a polygonal cross-section, a multi-lobed cross-section, or a T-shaped cross-section as long as the effects of the present invention are not impaired. Further, the fibers may contain or adhere to various properties-imparting substances such as pigments, matting agents, and ultraviolet absorbers.

The hollow ratio of the fiber is 5 to 30%, preferably 1
0 to 15%, especially 12 to 15% is desirable, and the hollow ratio is 5
%, The bending moment of the fiber becomes small, and it is not possible to obtain a firm tension. On the other hand, if it exceeds 30%, the cross section is broken during spinning, making it difficult to make the hollow. Further, the bending moment is increased, and the yarn surface is fuzzed at the time of spinning, and the appearance becomes dirty. Usually, the hollow fiber is crushed in the hollow part in a processing step such as a spinning step, so that the effect of the hollow fiber in the stage of finally becoming a fabric, for example, tension and heat retention are not exhibited. However, there is a fear that the fiber containing the inorganic fine particles generates a large number of voids in the fiber at the time of drawing, so that the strength of the fiber is inferior and that the hollow portion may be ruptured. In particular, in the present invention, the cross-sectional deformation due to fiber damage is small even after the spinning step and the weaving step, and the cross-sectional deformation when the major axis of the fiber section after passing through those steps is L1 and the minor axis of the fiber section is L2. The ratio (L2 / L1) is 1 to 0.5. If the deformation ratio is less than 0.5, the cross-section becomes too flat, the texture becomes rough, and a desired dry feeling cannot be achieved. Therefore, it is particularly preferably 0.8 to 0.6.
Such a good deformation rate serves to reduce the frictional resistance of the fiber in the spinning process due to the presence of the inorganic fine particles protruding from the fiber surface, and the inorganic fine particles fall off from the fiber surface by squeezing with a guide or the like. It is presumed that this reduces the external force such that the hollow portion is crushed.

The spun yarn of the present invention can produce a polyester hollow fiber satisfying the above requirements through a usual spinning process, and contains the hollow fiber in an amount of 30% by weight, preferably 50% by weight or more. It is necessary. If the content of the hollow fiber is small, not all of the effects of the present invention can be satisfied. Other fibers constituting the spun yarn include ordinary polyester fibers, other synthetic fibers, natural fibers, and semi-synthetic fibers, but polyester fibers are preferred. In addition, the above polyester hollow (short)
A yarn form in which a fiber and a filament yarn are combined may be used.

[0011] In the fabric of the present invention, good tension,
In order to achieve a dry touch, it is important that the polyester hollow fibers account for 30% by weight or more, preferably 50% by weight, of the fibers constituting the fabric.
The fabric does not need to be composed of 100% of the spun yarn of the present invention as long as the effects of the present invention are achieved.
The spun yarn of the present invention can be used in various forms in combination with a spun yarn made of ordinary polyester fibers, other synthetic fibers, natural fibers, semi-synthetic fibers, and the like to form a fabric. Of course,
The type, structure, density, cover factor, basis weight and the like of the cloth can be variously changed. Conventional techniques can be adopted for fabric production. In the present invention, it is necessary to subject the fabric to an alkali weight reduction treatment to form fine irregularities on the fiber surface. The fine irregularities are observed at a magnification of 4000 times with a scanning electron microscope on the surface of the fiber, and are observed as oblong depressions having a minor axis of 0.3 to 2 μm and a major axis of 1 to 8 μm on the surface. , The number of depressions is 1
It is desirable that the number be at least 100,000 / mm ／ 2, especially at least 250,000 / mm ↑ 2. If the number is small, not only the dry touch is not sufficiently exhibited, but also it may be difficult to keep the deformation rate of the hollow fiber after forming into a fabric within the range specified in the present invention. Although the conventional treatment method can be basically used for the alkali weight reduction treatment, the weight reduction rate is 10 to 40%, particularly 15%.
~ 35% is desirable. If it is less than 10%, the fiber surface has few irregularities and lacks a dry feeling, leaving a slimy feeling. If it exceeds 40%, the fiber surface has too many irregularities and a rough feeling is produced, which is not preferable.

[0012]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples.
The method for measuring the characteristic values and the evaluation of the fabric are as follows. <Fineness> It was measured by JIS L1015 7-5-1A method. <Hollow ratio (%)> A cross-sectional photograph of the single fiber was taken and determined from the area ratio. <Deformation rate> The spun yarn was opened, a photograph of the cross section of the single fiber was taken, the short diameter and the long diameter of the cross section were measured, and their ratio was determined. <Alkali Weight Loss> Determined from the ratio of the weight of the fabric treated with alkali, washed with water and dried to the weight of the fabric before the treatment. <Evaluation of fabric> Touch feeling (dry touch, tension, etc.)
The sensory evaluation was performed, and a superior one was ranked A, a good one was ranked B, a normal one was ranked C, and a poor one was ranked D.

Example 1 Polyethylene terephthalate containing 3.0% by weight of titanium dioxide was melt-spun and stretched to obtain a polyester hollow fiber having a denier of 3.0 denier and a hollow ratio of 20%. When a spun yarn of English cotton count 30 ′S was manufactured using 100% of the polyester hollow fiber according to a conventional method, a deformation rate of a cross section of the fiber constituting the spun yarn was 0.7. When this was made into a plain weave and subjected to an alkali weight loss of 20%, it was found to be excellent in tension and dryness.

Examples 2 to 5, Comparative Examples 1 to 3 The contents of inorganic fine particles, denier of single fiber, hollow ratio, deformation ratio during spinning, blend ratio and alkali reduction ratio were variously changed as shown in Table 1. A spun yarn and a woven fabric were prepared in the same manner as in Example 1, and the respective evaluations were made.

[0015]

[Table 1]

[0016]

According to the present invention, it is possible to obtain a polyester fabric having a hemp-like feel which is stiff and has an excellent dry feeling.

Claims (2)

(57) [Claims] 1. An inorganic fine particle containing 1 to 10% by weight, a single fiber denier of 1.5 to 4 denier, and a hollow ratio of 5 to 30
%, Sectional deformation rate L2 / L1 (L1 is the major axis of the fiber cross section, L
2 is a spun yarn comprising 30% by weight or more of a polyester hollow fiber in which at least a part of the inorganic fine particles protrude from the fiber surface. . 2. An inorganic fine particle containing 1 to 10% by weight, a single fiber denier of 1.5 to 4 denier and a hollow ratio of 5 to 30
%, Sectional deformation rate L2 / L1 (L1 is the major axis of the fiber cross section, L
2 is a polyester hollow fiber having a fiber cross section with a minor diameter of 1 to 0.5 and fine irregularities on the fiber surface of 30% by weight.
A fabric including the above.