JPH10226935A - Highly shrinkable lightweight bulky textured yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a highly shrinkable lightweight bulked textured yarn capable of manifesting a higher density by heat shrinkage after formation into a fabric without requiring the special higher densification at the time of weaving and providing a fabric havjng a light weight and further a spunlike fuzzy feeling in spite of a high density. SOLUTION: This highly shrinkable bulked textured yarn is a combined filament interlaced yarn comprising a polyester-based highly shrinkable yarn A comprising single filaments, constituting the yarn and having a hollow cross- sectional shape and >=0.35g/denier heat shrinkage stress and a polyester-based low shrinkable yarn B having a lower shrinkage percentage in hot water than that of the highly shrinkable yarn A by >=5%. The combined filament interlaced yarn has >=15% shrinkage percentage in hot water and >=10 loop fuzzes per m after the hot water treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly shrinkable lightweight bulky yarn suitable as a yarn for a spun-tone high-density woven fabric.

[0002]

2. Description of the Related Art As a material for high-density woven fabrics, cotton yarn of a fine count is generally used. However, in the case of producing a woven fabric from cotton yarn in such a method, the weaving efficiency is poor, the feeling of the product is hard, and the product is heavy,
Furthermore, the use of a large amount of high-quality yarns is expensive, and has a drawback in that it is not widely used in general clothing.

In order to solve the above-mentioned drawbacks, for example, Japanese Patent Application Laid-Open No. Sho 60-94636 discloses that a core-sheath type mixed entangled yarn is formed from a core yarn and a sheath yarn having a difference in heat shrinkage, and There has been proposed a method of imparting a span-like swelling or fluffiness to a fabric by utilizing the difference in heat shrinkage of the fabric. However, since this entangled yarn has a small difference in thermal shrinkage between the core yarn and the sheath yarn, it cannot impart a sufficient fluffiness to the fabric, and the thermal shrinkage of the entire yarn is low, so It was difficult to increase the density of the woven fabric due to heat shrinkage after the heat treatment.

Japanese Patent Application Laid-Open No. 3-294535 discloses that a yarn obtained by blending and entangled a high shrinkage yarn and a low shrinkage yarn having a high hot water shrinkage is subjected to a heat treatment so as to obtain a shrinkage effect of the high shrinkage yarn. Along with densification of the fabric by shrinking the entire yarn, the bulkiness is increased by the difference in heat shrinkage between the high shrinkage yarn and the low shrinkage yarn, and at the same time, a large number of loop fluffs are raised on the surface of the fabric for span touch. There has been proposed a method for imparting fluffiness. However, while this method can increase the density of the fabric by shrinking the yarn, it does not solve the disadvantage that the obtained fabric becomes heavier in proportion.

[0005] With the advent of the aging society in recent years, the demand for lightweight materials has been increasing, and the development of lightweight yarns for spun-tone high-density fabrics, which are light despite high density, has been developed. Long-awaited.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and does not require any special densification at the time of weaving. The technical problem is to provide a high-shrinkage lightweight bulky yarn that is possible, and that the resulting fabric is lightweight despite having a high density and has a span-like fluffiness. Is what you do.

[0007]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, have obtained a high-shrinkage yarn having a high heat shrinkage stress and a low-shrinkage yarn by performing a mixed fiber entanglement treatment. The yarn to be shrunk by heat treatment after forming the fabric, the entire yarn shrinks due to the shrinkage effect of the highly shrinkable yarn, thereby increasing the density of the fabric, and the difference in heat shrinkage between the highly shrinkable yarn and the low shrinkage yarn. The bulkiness is expressed or increased, and a large number of loop fluffs emerge on the surface of the fabric to give a span-like fluffiness.
At least the present inventors have found that using a hollow cross-section yarn as the highly shrinkable yarn results in a very light-weight fabric with high density.

That is, the present invention relates to a polyester-based high-shrinkable yarn A in which a single yarn constituting a yarn has a hollow cross-sectional shape and a heat shrinkage stress of 0.35 g / d or more. Polyester low shrinkable yarn B having a hot water shrinkage of 5% or more
And the mixed fiber entangled yarn has a hot water shrinkage of 15% or more, and has 10 or more loop fluffs per meter after hot water treatment. SUMMARY OF THE INVENTION The present invention provides a high-shrinkage, lightweight, bulky processed yarn characterized by the following.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The high shrinkage lightweight bulky processed yarn (hereinafter referred to as processed yarn) of the present invention is a mixed fiber entangled yarn composed of a polyester-based high-shrinkage yarn A and a polyester-based low-shrinkage yarn B.

The single yarn constituting the highly shrinkable yarn A has a hollow cross-sectional shape, and by having the hollow cross-sectional shape, it is possible to impart lightness to the fabric which is a feature of the present invention. . The cross-sectional shape of the single yarn constituting the high-shrinkable yarn A is not particularly limited, and may be any of a circular shape and a three-leaf shape. The relationship between the cross-sectional shape and the shape of the hollow portion is similar. And non-similar shapes. Further, a so-called open-type hollow cross-sectional shape having a communication hole from the hollow portion to the fiber surface may be used. Also, the number of hollow portions is not particularly limited, and may be one or two or more.

FIG. 5 shows a highly shrinkable yarn A applied to the present invention.
It shows an example of a cross section of a single yarn constituting
(A) is a circular cross section, (b) is a triangular cross section, (c) is an open hollow cross section having a communication hole from the hollow portion to the fiber surface, (d) is an example having a plurality of hollow portions, (a) shows a similar shape of the cross section of the hollow single yarn and the cross section of the hollow portion, and (b) shows a non-similar shape.

Although the hollow ratio of the single yarn is not particularly limited, it is preferable to select one having a hollow ratio of 5% or more and less than 70%. If the hollow ratio is less than 5%, the light weight effect of the obtained processed yarn tends to decrease, and if it is 70% or more, the hollow cross-sectional shape may be destroyed during weaving or dyeing, and there is a concern that the physical properties of the fabric may deteriorate. Is not preferred. (S ₁ / S ₀ ) × 100 (3) Here, the hollow ratio refers to the ratio of the area of the hollow portion to the total area of the cross section in the cross section of the single yarn constituting the yarn. More specifically, a cross section of the yarn is photographed or projected, and an area measuring device, for example, a digitizer manufactured by Sun Engineering Co., Ltd., is used to measure the area S _{0 of the} entire single yarn and the area S of the hollow portion. ₁ is measured and calculated by the above equation (3).

Next, the polyester-based low shrinkage yarn B is
The hot water shrinkage is 5% or more lower than the high shrinkable yarn A described above. The processed yarn of the present invention is characterized in that looped fluff is developed or increased by heat treatment after forming into a fabric, and a span-like fluff feeling is imparted. In order to develop or increase the loop fluff on the yarn surface by the heat treatment effect, it is effective to use the difference in hot water shrinkage between the high shrinkage yarn A and the low shrinkage yarn B, and the processed yarn of the present invention This is to make full use of this contraction effect.

That is, the processed yarn of the present invention is a mixed-fiber entangled yarn obtained by subjecting a high-shrinkage yarn A and a low-shrinkage yarn B to a fluid treatment, and specifically, a loop shown in FIG. A so-called interlaced yarn that does not form fluff,
, Which form a so-called Taslan blended fiber that forms an arch-shaped loop fluff or a clundle loop fluff. When this processed yarn is subjected to hot water treatment, as shown in FIG. 2 and FIG. The high-shrinkable yarn A shrinks to form a core of the processed yarn, and the low-shrinkable yarn B becomes a bulky two-layered processed yarn in which a sheath is formed. In such a complicated bending state, the surface of the yarn emerges to form a loop. The loops raised on the surface of the yarn can provide a span-like fluffiness. Also, due to this bulky two-layer structure, a large number of voids will be generated,
The lightness can be further increased.

Therefore, when the hot water shrinkage of the low shrinkable yarn B is close to the hot water shrinkage of the high shrinkable yarn A, and the difference in the hot water shrinkage of both yarns is less than 5%, the bulky two-layer structure is obtained. In addition to not being a processed yarn, sufficient loop fluff cannot be formed on the yarn surface, and the object of the present invention cannot be achieved.

[0016] The processed yarn of the present invention can be used after hot water treatment.
The number of loop fluffs per m must be 10 or more, preferably 20 or more. The formation amount of the loop fluff after the hot water treatment is a factor that determines the span-like fluffiness of the fabric obtained by weaving the processed yarn. If the number of loop fluffs after the hot water treatment is less than 10, the span-like fluff is used. The feeling cannot be sufficiently obtained, and the span effect is poor.
In addition, the lightness is poor.

The feature of the processed yarn of the present invention is that it does not require any special densification at the time of weaving, and can achieve high density by heat shrinkage after forming into a fabric. Therefore, the processed yarn of the present invention has a hot water shrinkage of 15% or more, preferably 20%
It is necessary to be above. If the hot water shrinkage is less than 15%, even if the fabric is treated with hot water, the shrinkage is small and sufficient densification cannot be achieved.

Further, in order to increase the density of the fabric by utilizing heat shrinkage, it is necessary that the hot water shrinkage ratio satisfies the above conditions and that the heat shrinkage stress is high. The present inventors first examined the relationship between the heat shrinkage stress of the processed yarn of the present invention and the heat shrinkability of the cloth as a result. As a result, when the heat shrinkage stress of the processed yarn of the present invention became 0.2 g / d or more, the cloth Was found to exhibit a sufficient contraction force without being restricted by the tissue of the above. Furthermore, as a result of variously examining the relationship between the heat shrinkage stress of the high shrinkable yarn A and the processed yarn of the present invention, the fineness relationship of the low shrinkage yarn B is less than 5 times the fineness of the high shrinkage yarn A in practical use. When satisfying the above, if the heat shrinkage stress of the highly shrinkable yarn A is 0.35 g / d or more, the heat shrinkage stress of the processed yarn of the present invention is 0.2 g / d or more. That is, the heat shrinkage is not restricted by the structure of the fabric, and in order to exhibit a sufficient shrinkage force, the heat shrinkage stress of the highly shrinkable yarn A constituting the processed yarn of the present invention is 0.35 g / d or more. There is a need.

The highly shrinkable yarn A which sufficiently satisfies such conditions is made of polyethylene terephthalate (PET).
The polyester obtained by copolymerizing the components can be obtained by spinning and drawing. Specifically, as a copolymer monomer in PET, for example, isophthalic acid, 1,2-bis (4-carbophenoxy) ethane, 2,6-naphthalene dicarboxylic acid, adipic acid, sebacic acid, oxalic acid, propylene glycol, , 4-butanediol, 2,2
A copolymerized PET obtained by selecting one or two kinds from among bis- (4-2-hydroxyethoxyphenyl) propane, neopentyl glycol, glycerin, pentaerythritol and the like, and performing copolymerization, is supplied to a hollow spinning nozzle. It can be obtained by drawing after spinning using.

The heat shrinkage stress is as follows.
That is, when the yarn is gripped at a constant length under a tension of 0.1 g / d and heated and heated, the yarn tends to thermally contract, but since both ends are fixed, the actual contraction occurs. This does not occur, but instead, an internal stress is generated in the yarn to shrink, and this stress is called heat shrinkage stress.

In the processed yarn of the present invention, the composition ratio of the high shrinkage yarn A and the low shrinkage yarn B is such that the fineness of the low shrinkage yarn B is less than 5 times the fineness of the high shrinkage yarn A. The range is not particularly limited as long as it is within the range, and may be appropriately selected within the range in which the desired hot water shrinkage and the loop fluff appear.

Since the textured yarn of the present invention has the above-described structure, it does not require any special densification at the time of weaving, and can be densified by heat shrinkage after forming into a fabric. Has the effect of being lightweight despite having high density, and having a span-like fluffiness. However, if the following configuration is adopted, the above effect is further improved. Can be done.

First, as the single yarn fineness of the high shrinkable yarn A and the low shrinkage yarn B is defined by the formulas (1) and (2), the single yarn fineness a of the high shrinkable yarn A is 2d or more. It is preferable that the single yarn fineness b of the low shrinkage yarn B is less than 2d. When the single yarn fineness of the polyester-based high-shrinkable yarn A is 2d or more, the tension of the fabric obtained by weaving the processed yarn of the present invention,
The waist is further improved, and the single shrinkage fineness of the low shrinkage yarn B is 2
When the value is less than d, the softness and flexibility of the obtained fabric are further improved. In particular, in order to obtain a soft fluffy feeling of peach skin tone and span tone, the single yarn fineness of the low shrinkage yarn B must be adjusted.
It is preferable to make it less than 0.8d.

Further, as the low shrinkage yarn B, a yarn which has been subjected to drawing or false twist crimping can be used, but the lightness which is one of the features of the processed yarn of the present invention is further improved. In order to achieve this, it is preferable that the single yarn constituting the low shrinkage yarn B also has a hollow cross-sectional shape. In this case, the cross-section and the shape of the hollow portion of the single yarn constituting the low-shrinkage yarn B may be appropriately selected from the hollow cross-sectional shape of the high-shrinkage yarn A described above.

The number of loop fluffs referred to in the present invention is the number of loop fluffs having a height of 1 mm or more from the center of the yarn axis at any 20 places under a microscope and between each 5 cm. And converted to 1 m.

The number of loop fluffs after the hot water treatment is determined by the above-described measurement method. In the hot water treatment, the number of turns is measured by applying a tension of 0.1 g / d to the sample using a measuring machine having a frame circumference of 1.125 m. Ten small skeins were prepared, and the small skeins were immersed in boiling water at 98 ° C. for 30 minutes in a free state, and then placed on a horizontal table and air-dried in a tension-free state.

Further, the hot water shrinkage ratio is determined according to JIS L101.
The thermal shrinkage stress was measured in accordance with No. 9 and the stress corresponding to the temperature was recorded on a recorder using a commercially available Kanebo thermal stress meter KE-2 (manufactured by Kanebo Engineering Co., Ltd.), and the peak stress value was measured. Was divided by the fineness (denier) of the yarn.

[0028]

Next, the present invention will be described specifically with reference to examples. In the evaluation of the lightness in the examples, the basis weight T (g / m ² ) and the thickness L (mm) of the woven fabric were measured in accordance with JIS L 1018, and the cloth density ( g / m ²
・ Mm). Fabric density = T / L (4) The value of the fabric density indicates that the smaller the value, the better the light weight effect.

Example 1 A copolymerized PET obtained by copolymerizing PET with isophthalic acid and 2,2-bis (4-2-hydroxyethoxyphenyl) propane in a proportion of 4 mol% was spun using a hollow spinning nozzle, and then stretched. It has one circular hollow part with a hollow ratio of 18% inside the circular cross section, and has a heat shrinkage stress of 0.45 g / d,
A highly shrinkable yarn 70d / 18f having a hot water shrinkage of 24% was obtained. This high shrinkage yarn and PE having a hot water shrinkage of 8% as a low shrinkage yarn
The T yarn 75d / 72f was aligned and subjected to fluid treatment at an interlace nozzle air pressure of 2 kg / cm ² to obtain a 145d / 90f high shrinkage lightweight bulky yarn. The high shrinkage lightweight bulky yarn was woven using a warp and a weft to obtain a woven fabric having a flat structure. Table 1 shows the properties of the obtained high shrinkage lightweight bulky processed yarn and woven fabric.

[0030]

[Table 1]

As is clear from Table 1, the obtained woven fabric was a high-density woven fabric having a spun tone, in which the density of the tissue was increased due to the heat shrinkage during the boiling water treatment, loop fuzz was formed. Moreover, regardless of the high-density woven fabric, it was also excellent in lightness.

Comparative Example 1 Example 1 was repeated except that a PET yarn 85d / 18f having a circular solid cross section, a heat shrinkage stress of 0.20 g / d and a hot water shrinkage of 10% was used as the high shrinkage yarn. After processing to obtain a 160d / 90f processed yarn, the processed yarn was woven using a warp and a weft to obtain a woven fabric having a flat structure. As is clear from Table 1, the obtained woven fabric had no loop fluff, did not have a feeling of span tone, and had poor lightness.

Example 2 A copolymerized PET obtained by copolymerizing 10% by mole of isophthalic acid component with PET was spun using a hollow spinning nozzle, stretched, and formed inside a circular cross section with a hollow ratio of 24% to extend through the fiber surface to the fiber surface. 30d / high shrinkable yarn having one circular hollow part having a heat shrinkage stress of 0.42 g / d and a hot water shrinkage of 28%
6f was obtained. PE with 11% hot water shrinkage as low shrinkage yarn
Using false twisted yarn T yarn 60d / 72f, the high-shrinkable yarn and pull aligned, overfeed of 5%, high shrinking lightweight and fluid treatment 90d / 78f in air pressure 5Kg / cm ² of Tasuran'nozuru A bulky yarn was obtained. The high shrinkage lightweight bulky yarn was woven using a warp and a weft to obtain a woven fabric having a flat structure.

As is clear from Table 1, the obtained woven fabric has a high density after the boiling water treatment, and the loop fluff composed of a single yarn on the sheath side emerges densely on the surface, thereby giving a soft peach skin tone. It became a feeling. Furthermore, the obtained woven fabric was excellent in lightness.

Example 3 As a low shrinkage yarn, a 55d / 36f non-twisted yarn having a hot water shrinkage of 10% and one circular hollow portion having a hollow ratio of 12% inside a circular cross section was used. , Processed in the same manner as in Example 2,
A 85d / 42f high shrinkage lightweight bulky yarn was obtained. The high shrinkage lightweight bulky yarn was woven using a warp and a weft to obtain a woven fabric having a flat structure.

As is clear from Table 1, the obtained woven fabric had a high density, a soft peach skin-like feel, and was extremely excellent in lightness.

Comparative Example 2 A high shrinkage yarn was processed in the same manner as in Example 2 except that a circular solid cross section of 40d / 6f was obtained to obtain a processed yarn of 100d / 78f and a woven fabric. As is clear from Table 1, the woven fabric after the boiling water treatment had a high density and a soft peach skin tone, but was poor in lightness.

[0038]

The high shrinkage lightweight bulky yarn of the present invention does not require any special densification at the time of weaving, and can be densified by heat shrinkage after forming into a fabric. Is expressed and increased, so that a fabric having a high-density, span-tone fluffiness can be obtained without lowering the weaving property, and the obtained fabric is lightweight despite its high density. is there.

[Brief description of the drawings]

FIG. 1 is a schematic external view showing an example of a high shrinkage lightweight bulky yarn of the present invention.

FIG. 2 is a schematic external view of the processed yarn of FIG. 1 after hot water treatment.

FIG. 3 is a schematic external view showing another example of the high shrinkage lightweight bulky processed yarn of the present invention.

FIG. 4 is a schematic external view of the processed yarn of FIG. 3 after hot water treatment.

5 (a), (b), (c), (d) are cross-sectional views of a single yarn constituting the highly shrinkable yarn A. FIG.

[Explanation of symbols]

 A high shrinkage yarn B low shrinkage yarn

Claims (3)

[Claims] 1. A polyester-based high shrinkable yarn A in which a single yarn constituting a yarn has a hollow cross-sectional shape and a heat shrinkage stress of 0.35 g / d or more, and a hot water shrinkage rate higher than the high shrinkable yarn A And a polyester-based low-shrinkable yarn B having a low shrinkage ratio of 5% or more.
A high shrinkage lightweight bulky yarn characterized by having a loop fuzz count of 15% or more and 10 or more loops per meter after hot water treatment. 2. The high shrinkage lightweight bulky processing according to claim 1, wherein the fineness of a single yarn constituting the high shrinkage yarn A and the low shrinkage yarn B satisfies the following expressions (1) and (2) simultaneously. yarn. a ≧ 2.0 (1) b <2.0 (2) Here, a and b are fineness (denier: d) of a single yarn constituting the high shrinkage yarn A and the low shrinkage yarn B, respectively. It is. 3. The high shrinkage lightweight bulky yarn according to claim 1, wherein the single yarn constituting the low shrinkage yarn B has a hollow cross-sectional shape.