JPH01124651A - Fine denier polyester fabric - Google Patents

Abstract

PURPOSE: To produce a woven fabric having a soft surface touch and good repulsive properties and difficultly wrinkled by weaving a conjugated false twist-processed yarn obtained by simultaneously drawing and false twist- processing a highly oriented and a moderately oriented specific polyester multifilament undrawn yarns, respectively. CONSTITUTION: This fine denier polyester woven fabric is obtained by simultaneously false twist-processing a highly oriented polyester multifilament undrawn yarn having >=0.08 optical birefringence Δn, 0.5-4.0 de monofilament denier D1 and >=500 kg/mm<2> Young's modulus Y1 and a moderately oriented polyester multifilament undrawn yarn having 0.08>=Δn>=0.03, <=0.5 de monofilament denier satisfying formula I, and Young's modulus satisfying formula II. Thus, a conjugate fiber, in which non-interlaced blended portions 2 lie between tightly interlaced portions 1 and present in >=50% in the longitudinal direction of the yarn, is obtained and weaving is carried out by using the conjugate fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a fine denier polyester fabric obtained by weaving using false twisted polyester yarn.

(Prior Art) It has been known for some time to use fine denier polyester to obtain fabrics that are soft to the touch.

That is, the fabric is woven using ultrafine multifilament yarns having a single yarn denier of t, ode or less, and the surface of the fabric is covered with the ultrafine multifilament yarns to produce a fabric that is soft to the touch. The disadvantages of fabrics using ultra-fine multifilament yarns are that, while the surface touch is soft and satisfies the requirements, the use of ultra-fine fibers reduces repulsion and makes them prone to wrinkles.

Fabrics made of polyester are known to be wrinkle-resistant, so the disadvantage of easily wrinkled creates a bad product image, and for this reason, polyester fabrics made of ultra-fine fibers can hardly be used without special processing such as resin processing. However, it did not have any commercial value.

In order to improve the drawbacks of such ultra-fine maui,
Attempts have also been made to mix and use polyester filament yarns of various sizes and polyester filament yarns having a normal single-filament denier.

As such a polyester blend yarn,
Some of them are described in Japanese Patent No. 19730. However, even if such a polyester blend yarn is used, the disadvantage of being easily wrinkled is not sufficiently improved, and when blending yarns with significantly different deniers, such as Yang fine m fiber and normal denier fiber, However, it is difficult to uniformly mix the fibers industrially, and it is obtained as a yarn with a mixed fiber part. In this way, when creating a brain-woven fabric using yarn with mixed fibers, there are some cases where lines in the warp direction (warp lines) become a fatal flaw, and there are cases where such a fatal flaw does not occur. Also, mixed a
The surface of the fabric was irritable due to m, which significantly reduced the quality of the fabric surface.

(Objective of the Invention) The object of the present invention is to improve the drawbacks of such ultra-fine & 8M fabrics, and to propose a fine denier polyester fabric that is soft to the touch, has good repellency, and is resistant to wrinkles. It's about doing.

(Structure of the Invention) The present invention provides a composite false-twisting process that includes a tightly entangled portion and a non-entangled mixed fiber portion obtained by simultaneously drawing and false-twisting two or more types of polyester multifilament yarns having different birefringence ΔL. A woven fabric made of yarn, and one type of polyester multifilament type constituting the composite false twisted yarn, has a single yarn denier 01 of 0.5<D+ ≦4.0 (de) and a Young's modulus Y1 of Y1. ≧500Kg/mm2, and the other type of polyester multifilament yarn has a single yarn denier D2 of 0≦0.5 (de).
aw, the single yarn denier and Young's modulus satisfy the following formula, and the non-entangled mixed fiber portion of the composite false twisted yarn is 50
It is a fine denier polyester fabric characterized by being composed of threads present in an amount of % or more.

DI/D2≧3.5...(1) Yl/Y2
≧1.20 (2) The composite false twisted yarn used in the present invention is obtained by simultaneous stretching and false twisting of two or more types of polyester multifilament yarns having different birefringence Δn.

One of the two types of polyester filament yarns is
A highly oriented undrawn yarn with a birefringence Δn of Δn≧0.08 and a single yarn denier D+ of 0.5 (d
e) < D + ≦ 4.0 (de), more preferably 0.5 (de) < D + ≦ 2.0 (de) (thick denier filament);
The seeds are medium-oriented undrawn yarns with birefringence Δn in the range of 0.08>Δn≧0.03, and ultrafine yarns with a single yarn denier D2 of D≦0.5 (de) after stretching and heat processing. It is a fiber.

A highly oriented undrawn yarn with a birefringence Δn of Δn≧0.08 is obtained by ultrahigh-speed spinning at a take-up speed of 4.500 m/min or more, and has a birefringence Δn of O, Oa > Δn≧0. 0
3, the medium-oriented undrawn yarn has a take-up speed of 2,5007F.
It is obtained by high-speed spinning at L/min or more and less than 4,500 rrt/min.

The present invention utilizes these undrawn polyester filament yarns, supplies them to an interlacing nozzle, interlaces them, and then crimps them using a known simultaneous stretching and false twisting method to obtain a composite false-twisted yarn. used as. Furthermore, it is necessary to use the single yarn denier D+ and D2 whose ratio satisfies the formula (1), and furthermore, the Young's modulus YI of the thick denier polyester filament constituting the composite false twisted yarn must be , Y1≧500Kg/m
m2, and the ratio to Young's modulus Y2 of the thin denier polyester filament satisfies equation (2).

The ratio of these fine denier polyester filament yarns to thick denier polyester filament yarns is selected in the range of 70:3 to 30 near 0, and preferably,
A ratio of 70:30 to 50:50 is used.

Further, the composite false twisted yarn used in the present invention includes a tightly entangled portion and a non-interlaced mixed fiber portion as a yarn form, and the tightly entangled portion is a yarn in the fabric.
50 fibers/m or more, but the lengthwise ratio of the tightly entangled portion to the non-entangled mixed fiber portion along the yarn axis direction is such that the non-entangled mixed fiber portion must be present at 50% or more. It is more preferable that the non-entangled mixed fiber portion is present in an amount of 60% or more.

FIG. 1 is a side view showing an example of a composite false twisted yarn used in the present invention, and FIG. 2 is a sectional view showing a cross section of two parts of the composite false twisted yarn shown in FIG. 1. .

In FIG. 1, it consists of a tightly intertwined part 1 and a non-entangled mixed fiber part 2. In the tightly intertwined part 1, mainly thick denier polyester filaments 3 are arranged in the inner layer part of the yarn, and fine denier polyester filaments 4 are arranged in the inner layer of the yarn. is a part that is wrapped around it and is tightly intertwined as a whole, and in the non-entangled mixed fiber part 2, the thick denier filament 3 and the fine denier filament 4 are in a mixed fiber state, and, The filaments are arranged without being closely intertwined with each other. Therefore, in the non-entangled mixed fiber portion 2,
When the composite false-twisted yarn is extracted from the woven fabric and released in a tension-free state, each filament is separated into a kind of loose state. On the other hand, a tightly intertwined part is
This refers to the part that does not exhibit such a state of disarray.

As is clear from Fig. 2, the cross-section of such composite false-twisted yarn is deformed by drawing and false-twisting and processing, and the degree of deformation of the fine denier filament is particularly large. /b indicates a deformation degree of a/b≧1.5. The degree of deformation a/b referred to here is the ratio of the long axis a and the short axis of the cross section measured (average value).

On the other hand, the degree of deformation of thick denier filaments is small, and in terms of the degree of deformation, a/b < 1.5.

(Action of the invention) As described above, the present invention has a single yarn denier of 0.5 (
de) Despite using the following ultrafine fibers, a fabric with good repellency and less wrinkles can be obtained.

Since the present invention uses ultrafine fibers, it is natural that a fabric with a soft surface touch can be obtained, but the dry touch characteristic of fabrics using false twisted yarn disappears, resulting in a slimy feel. It becomes the texture.

Conventionally, it has been known that undrawn polyester filament yarns having different birefringence Δn are simultaneously stretched and false-twisted to yield a composite yarn with a two-layer structure.

In the present invention, a polyester filament yarn with a thick denier is highly oriented with a birefringence Δn of Δn≧0.08, and a polyester filament yarn with a fine denier has a D2
Ultrafine fibers with ≦0.5 (de) and Δn of 0.08
＞Δn≧0.03, and the tightly entangled part and non-interlaced N obtained by simultaneous stretching and false twisting.
Since a composite false twisted yarn containing a mixed fiber portion is used, the fabric is given appropriate fullness, and at the same time has good resilience and wrinkle resistance. In particular, there is a non-entangled mixed fiber portion as shown in Figure 2, and DI/D2≧3.5
Because the fibers are mixed with different deniers, IIWi does not form a packed dense structure in the fabric, and there is a considerable amount of IIWi! lNl
Since it has a space and the ultrafine fibers are deformed into various shapes, the degree of freedom of movement of the woven fabric structure is large.

In such interfiber spaces, the Young's modulus Y1 of the thick denier polyester filament is made larger than the Young's modulus Y2 of the thin denier polyester filament, thereby solving the problem of easy wrinkles caused by using ultrafine fibers.

In addition, the iI of the non-entangled mixed fiber portion that brings about this effect
By arranging tightly entangled portions between the non-entangled mixed fiber portions, the N void structure is prevented from disappearing in the fabric, and good wrinkle resistance is imparted to the fabric.

In the present invention, the Young's modulus Y is the Young's modulus of a filament single yarn, and its measuring method is JIS L-
1015 (1981) 7.11 Initial tensile resistance measurement method.

(Example) Polyester multifilament undrawn yarn whose birefringence Δn is Δn=o, oa (single yarn denier after false twisting [
), = 1.63 (da), number of filaments -
24 filaments] and polyester multifilament undrawn yarn with birefringence Δn = 0.045 [single yarn denier D2 after false twisting D2 - 0.46 (de), number of filaments - 144] , after being aligned and fed to the entangling treatment nozzle to impart entanglement, a stretching ratio of -1.35 and a tentative 1! Processed at a temperature of -180°C to create composite false twisted yarn (total denier: 105 de
) was obtained.

The composite false twisted yarn had a tightly entangled portion of 70 pieces/TrL and a non-entangled mixed fiber portion of 77.5%.

This composite false twisted yarn was subjected to an additional twist of 300T/M in the S direction and woven into a 2/2 twill structure at a warp density of 177/3.79 an and a weft density of 149/3.79α.

The obtained fabric was subjected to alkali reduction processing (loss reduction rate 5.2%).
Finished through normal dyeing and finishing processes including. The obtained woven fabric had a very soft surface to the touch, had high p-resistance, and was resistant to wrinkles, and a high-quality woven fabric without any irritation was obtained on the surface of the woven fabric. This quality without surface irritation could not be obtained with conventional fabrics using ultrafine fiber blend yarns.

Furthermore, for comparison, the birefringence Δn is Δn=0, 04
The polyester multifilament undrawn yarn [single yarn denier D+ after false twisting -1,92 (de), number of filaments 24] is 0, and the birefringence Δn is Δn=0.0.
17 polyester multifilament undrawn yarn [
Single yarn denier D2 after false twisting process = 0.41 (de)
, 144 filaments] were treated with an entangling treatment nozzle in the same manner as in Examples, and then subjected to simultaneous stretching and false twisting to obtain a composite false twisted yarn.

The resulting composite false-twisted yarn had a two-layer structure in which fine-denier polyester filaments were alternately twisted around thick-denier polyester filament yarns. Using this two-layer structure false twisted yarn, 300
After additional twisting of T/M, a fabric similar to that of the example was woven and finished through a dyeing and finishing process including an alkali reduction process.

The obtained fabrics had a soft texture, but were stiff, had poor resilience, and wrinkled easily.Table 1 shows the physical properties of the fabrics of the examples and the fabrics of the comparative examples. show.

Table 1 (a) Bending hardness (g) 9 Bending resilience (%) is JIS
L-1096 (1979) 6, 20.3
It was measured by a method based on method C.

(0) Wrinkle recovery Prepare a test cloth with an area that is sufficiently larger than the size of your outstretched hand, and grip it with a car-like grip (grip strength of 30 to 40 kg) on an area that is approximately the same size as the outstretched hand. Causes wrinkles. The wrinkled test fabric is stretched twice in the warp direction and the weft direction (elongation of 1% or less). Then,
The test cloth was spread out on a flat surface, and wrinkles on the surface were smoothed out with the palm of the hand two to three times to determine the degree of wrinkles.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a composite false twisted yarn used in the present invention. 2 is a sectional view showing a cross section of the composite false twisted yarn shown in FIG. 1. FIG. 1...Tightly intertwined part 2...Unentangled mixed fiber part, Fig. 1

Claims (1)

[Claims] Highly oriented polyester multifilament undrawn yarn satisfying birefringence Δn≧0.08, and birefringence Δn of 0.08.
A woven fabric made of a composite false-twisted yarn containing a tightly entangled portion and a non-entangled mixed fiber portion obtained by simultaneously stretching and false-twisting a medium-oriented polyester multifilament undrawn yarn in the range of >Δn≧0.03. Among the polyester multifilament yarns constituting the composite false twisted yarn, those derived from the highly oriented undrawn yarn have a single yarn denier D_1 of 0.5<D_1≦4.0 (de). , Young's modulus Y_1 satisfies Y_1≧500Kg/mm^2, and among the polyester multifilament yarns, the single yarn denier D_2 is D_2≦0.5 (de).
It is an ultra-fine fiber that satisfies the following formulas, and the single yarn denier and Young's modulus satisfy the following formula, and the non-entangled mixed fiber portion of the composite false-twisted yarn is present in 50% or more in the yarn length direction. Fine denier polyester fabric. D_1/D_2≧3.5 Y_1/Y_2≧1.2 However, D_1...Single yarn denier of polyester filament obtained from highly oriented undrawn yarn D_2...Single yarn denier of polyester filament obtained from medium oriented undrawn yarn Y_1... Young's modulus of polyester filament single yarn corresponding to single yarn denier D_1...Young's modulus of polyester filament single yarn corresponding to single yarn denier D_2