JPH0649726A - Polyester sheath-core conjugated combined filament yarn - Google Patents

Abstract

PURPOSE:To obtain a polyester multifilament yarn having a worsted fabric-like soft swelling feeling, free from shiner, capable of deeply dyeing and suitable for middle or heavy-gage woven or knitted fabric. CONSTITUTION:The objective polyester sheath-core conjugated combined filament yarn is characterized in that the core part is a combined filament yarn consisting of two kinds of modified cross-section polyester multifilament yarns different by >=6% in boiling water shrinkage and the sheath part is non-modified cross-section polyester multifilament yarn wound at a rate of >=3500m/min and having 70-20g/d Young's modulus and the filament yarn of the sheath part is 5-20% longer than the combined filament yarn of the core part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheath-core composite mixed yarn made of polyester multifilament yarn. More specifically, the present invention relates to a polyester multi-filament sheath-core composite mixed yarn suitable for medium-thickness woven or knitted fabrics.

[0002]

BACKGROUND OF THE INVENTION Polyester multifilament yarn is widely used in the field of clothing because of its excellent characteristics.
Various manufacturing methods for changing the form of the yarn have been proposed. As a method of imparting bulkiness, false twisting, indentation,
In addition to spraying and the like, there are a manufacturing method in which two or more kinds of filament yarns are mixed and covered by an interlaced or Taslan method, and a manufacturing method in which a cross-sectional shape is changed as a manufacturing method for changing gloss and feel.

Various special yarns have also been proposed by combining these manufacturing methods. However, until now, most of the improvements have been aimed at the silky thin clothing field.
In recent years, polyester multifilament yarns have been used in the field of medium-thickness materials, that is, for clothing for autumn and winter, and are being developed in the field of worsted fabrics. In the development in this field, a soft swelling feeling and a bathochromic property which are repulsive and have a feeling of touch are required.

For example, Japanese Unexamined Patent Publication (Kokai) No. 56-128331 discloses a special silky bulky yarn and a method for producing the same, which shows a core thread and a sheath thread of a fluid-processed bulky thread which constitutes a core and a sheath. Denier, a difference in yarn length, a method of regulating boiling water shrinkage, a birefringence, and that the yarn of the sheath has a non-circular cross section. The purpose of this proposal is also a silky textured yarn targeting the silk field and a method for producing the silky textured yarn, and the purpose is to improve the unique tension, waist, luster and smoothness of the silky textured yarn.

[0005] However, such a processed yarn for the field of thin products has a problem in that it is insufficient in tension and stiffness in the field of medium-thickness products, especially in terms of bulkiness and bathochromatism. Also, JP-A-1-28235
No. 7, gazette discloses that a core portion made of at least three kinds of polyester multifilament yarns having different filament fineness has a denier of 6.5 to 11 and a medium fineness of the sheath portion is 2.5 to 4.
5 denier, fineness 0.7-2 denier, fineness ratio of core and sheath, fineness ratio of medium fineness filament yarn and fineness fineness filament yarn, and fine difference in yarn length among 3 types of filament yarn As a result, a false-twisted composite processed yarn has been proposed.

[0006] The object of this proposal is to obtain a knitted fabric which is suitable for fall and winter men's outer garments, which is good as a worsted woven fabric which is excellent in soft feeling, elastic resilience and natural feeling.
However, this proposal requires a false twisting process, which is a relatively slow processing speed, and causes false fluffing and crimping unevenness by falsely twisting three or more kinds of filament yarns having different denier under the same conditions. Easy, and the number of confounding is 150
It requires a lot of entanglement of not less than pcs / m, has many problems in terms of cost and processing control, and has not improved the bathochromic property.

In order to obtain the bathochromic property, for example, Japanese Patent Laid-Open No.
No. 4-120728 discloses a method in which a polymer containing fine particles is melt-spun, and the obtained filament yarn is treated with a solvent to form fine irregularities on the surface of the filament yarn. In Japanese Patent Publication No. 59-11709, a plasma is disclosed. Proposals have been made to form irregularities on the surface of filament yarns by processing. However, the method of imparting fine irregularities to the surface of these filament yarns is certainly improved in bathochromic property, but since the irregularities are too fine, the irregularities are easily broken and are difficult to handle, and the production method is Is also special and has problems in terms of cost.

[0008]

The object of the present invention is to have suitable tension, waist and drapability suitable for a carded woven or knitted fabric having a medium-thickness, a rebound and a soft swelling feeling. Another object of the present invention is to provide a polyester-sheath core composite mixed yarn composed of a polyester multifilament yarn having a bathochromic property.

[0009]

[Means for Solving the Problems] That is, the present invention is a mixed fiber yarn in which the core portion is composed of two types of polyester cross-filament yarns having an atypical cross section different from each other by 6% or more of the boiling water shrinkage, and the sheath portion is 3500 m / min or more. Young's modulus rolled up in 70 ~ 20g
/ D is a polyester multi-filament yarn having a non-atypical cross section, and the yarn length of the filament yarn of the sheath part is 5 to 20% longer than the yarn length of the mixed fiber yarn of the core part. It is a mixed yarn.

The polyester sheath-core composite mixed yarn of the present invention is
Young's modulus in which the core part is a yarn in which two types of tri- to pentagonal irregular cross-section polyester filament yarns having a boiling water shrinkage difference of 6% or more are mixed and then wound as a sheath part at 3500 m / min or more. This is a yarn in which the sheath portion of a polyester multifilament yarn of 70 to 20 g / d is mixed by 5 to 20% or more so that the yarn length is longer than that of the core portion.

The polyester sheath-core composite mixed yarn of the present invention comprises
A sheath-core composite mixed yarn in which a mixed yarn of two types of modified yarns having different shrinkage ratios constitutes a core portion, and a circular cross-section yarn having a small Young's modulus constitutes a sheath portion. The high-shrinkage yarn of the core used in the present invention is a yarn obtained from a copolymer obtained by polymerizing polyethylene terephthalate and another ester, and the low-shrinkage yarn is formed by spinning a polyester substantially composed of polyethylene terephthalate units under normal conditions, It is a yarn obtained by drawing. Further, they may contain additives such as heat stabilizers and matting agents.

The cross-sectional shape of the core yarn used in the present invention is atypical, and it is preferable that the high-shrinkage yarn and the low-shrinkage yarn have the same cross-sectional shape from the viewpoint of bulkiness and uniform fiber mixing property. It is preferably a general triangular sectional shape. The filament denier of the core yarn used in the present invention is preferably 1 to 3 denier, and the total denier is not particularly limited. If it is thinner than 1 denier, the resilience is insufficient, and if it exceeds 3 denier, the softness decreases.

In the core portion of the polyester sheath-core composite mixed fiber of the present invention, the difference in boiling water shrinkage between the high shrinkage yarn and the low shrinkage yarn is 6% or more, preferably 9% or more. When the boiling water shrinkage difference between the high shrinkage yarn and the low shrinkage yarn is less than 6%, the bulkiness is insufficient and the bulging feeling is insufficient. The core portion of the polyester sheath-core composite mixed yarn of the present invention is required to have a high-shrinkage yarn and a low-shrinkage yarn of atypical cross section mixed.

In the core portion of the polyester sheath-core composite mixed yarn of the present invention, it is preferable that the ratio of the high shrinkage yarn and the low shrinkage yarn is not less than 30% by weight, more preferably 40% by weight. Is not less than. The mixing may be performed by selecting an appropriate condition by a known mixing method, but from the viewpoint of uniformity of mixing and simplification of the process, simultaneous spinning and drawing from the same spinneret are preferable. The number of entanglements is preferably as small as possible, and is preferably 50 / m or less. This is because if it exceeds 50 pcs / m, the bulging feeling is insufficient and the surface of the finally obtained woven or knitted fabric is liable to cause irregularity.

The polyester sheath-core composite mixed yarn of the present invention is
The mixed fiber (core part) and the polyester multifilament (sheath part) having a Young's modulus of 70 to 20 g / d, which has been spun up at 3500 m or more, are mixed. This mixed fiber method is a known interlace method of injecting an air turbulent flow, and can be carried out by appropriately selecting the conditions.

The polyester sheath-core composite mixed yarn of the present invention is
It is necessary that the yarn length of the sheath portion is 5 to 20% longer than that of the core portion. If it is less than 5%, the sheath-core structure is unlikely to be formed, and the woven or knitted fabric is irritated and the bathochromic property is deteriorated. If it exceeds 20%, chattering and tarmi are generated, the yarn breaks during weaving and knitting, and fluff and tarmi appear on the woven and knitted fabric, which is not preferable. In the polyester-sheath core composite mixed yarn of the present invention, the ratio of the core portion to the sheath portion is preferably 75 to 40% by weight, and more preferably 70 to 50% by weight of the whole sheath portion. If it exceeds 75% by weight, the resilience is insufficient, and if it is less than 40% by weight, flicker occurs and the bathochromic property is impaired. Iraqi is less likely to occur as the covering of the sheath is more uniform, and is preferably in the range of the above weight% because the covering is good.

The filament denier used for the sheath of the present invention is preferably 2 to 4 denier. Further, in general, when a twist is applied, the swelling feeling is reduced, while surprisingly, the polyester-sheath core composite mixed yarn of the present invention is
There is no reduction in the soft bulge. The improvement phenomenon in which the soft swelling feeling is not reduced even when the above twist is imparted is a Young's modulus of 70 to 20 in which the core portion has a modified cross-section yarn and the sheath portion has a low orientation.
It occurs when it is g / d. Furthermore, by imparting a twist, the covering property of the sheath portion, the processability at the time of weaving and knitting are improved, and the rattling phenomenon does not occur. Therefore, the polyester sheath-core composite mixed yarn of the present invention is 100 times / m or more. It is preferable to impart the twist of.

Even with a modified cross-section yarn having a non-circular core, when the Young's modulus of the sheath exceeds 70 g / d, the soft swelling feeling is reduced. Further, if the Young's modulus is lower than 20 g / d, stain spots occur. The polyester-sheath core composite mixed yarn of the present invention is subjected to a weaving / knitting step, and can be made into a woven / knitted article through the same steps as the ordinary polyester multifilament yarn, and can be dyed by a usual method. The dyed medium-thick woven or knitted fabric has a moderate resilience and a soft swelling feeling, and shows a bathrochromic property free of flicker.

[0019]

EXAMPLES The present invention will be described in more detail by way of examples. The physical properties in the examples were evaluated as follows. A) Boiling water shrinkage ratio The length is calculated using the following formula from the lengths before (L ₁ ) and after (L ₂ ) the yarn is immersed in boiling water at 100 ° C. for 30 minutes.

Shrinkage rate of boiling water (%) = L ₁ −L ₂ / L ₁ × 100 B) Young's modulus Tensile strength at 1% elongation of yarn read from tension extension curve
From (g), it is calculated by the following formula. Young's modulus (g / d) = W (g) / positive denier × 10
0 C) Repulsion The fabric was evaluated by two panelists into two grades, that is, the feel was good and the feel was poor.

D) Soft swelling feeling The woven fabrics were evaluated by 5 panelists in three grades, from good feeling to good feeling, good, slightly good, and bad. E) Iraqi The fabric was visually evaluated by five panelists in four grades: no, little, little, and yes.

F) Bathochromic woven and knitted fabric, Dianix Tuxedo Black F as dye,
15% owf, PH 5, dye at 130 ° C. for 60 minutes, measure L value (brightness) with a colorimeter (Macbeth 2020 type),
L value of 12 or less is good, between 12 and 14 is slightly insufficient, 1
Those with 4 or more and a feeling of spotting were judged to be defective.

[0023]

Example 1 A low shrinkage yarn for the core has an intrinsic viscosity of 0.7.
2. Polyethylene terephthalate containing 0.5% by weight of titanium oxide was spun using a spinneret with a triangular cross section,
An unstretched yarn of 150d / 34f wound up was obtained in a minute. Also,
As the highly shrinkable yarn of the core part, a polyethylene terephthalate copolymerized with 10 mol% of 2,2-bis (4-β-hydroxyoxyethoxyphenyl) propane having an intrinsic viscosity of 0.72 and 0.5% by weight of titanium oxide is triangular. Spinning was performed using a cross-section spinneret, and an undrawn yarn of 150 d / 34 f was wound at 1000 m / min.

Next, both unstretched yarns obtained were combined and stretched just before the feed roll of a stretching machine, and a entanglement number of 20 / m was imparted to obtain a mixed fiber (core portion). The obtained core thread is
Boiling water shrinkage is 35% and cross section is triangular type 50d / 34f,
The mixed yarn was 50d / 34f having a triangular cross section with a boiling water shrinkage of 13%. On the other hand, polyethylene terephthalate having an intrinsic viscosity of 0.72 and titanium oxide of 0.2% was wound with a circular spinneret at a spinning speed of 4000 m / min for 75 d / 3.
A semi-unstretched yarn (sheath part) having 4f, Young's modulus of 30 g / d, and boiling water shrinkage of 30% was obtained.

Interlacing was carried out by increasing the yarn length of the sheath portion by 8% from the yarn length of the core portion to obtain a sheath-core composite mixed yarn having an interlacing number of 30 / m. This yarn was made into a satin woven fabric having a warp density of 194 yarns / inch and a weft density of 94 yarns / inch, and dyed and finished in a usual process. The evaluation results of the woven fabric are shown in Table 1.

[0026]

Example 2 The sheath-core composite mixed yarn obtained in Example 1 has 80
0 times / m of S twist and Z twist were applied. The obtained S twisted yarn and Z twisted yarn were alternately knitted using a 20-gauge double-sided knitting machine, and dyed and finished by a usual method to obtain a knitted fabric. Table 1 shows the evaluation results of the knitted fabric.

[0027]

[Comparative Example 1] Polyethylene terephthalate having an intrinsic viscosity of 0.72 and titanium oxide of 0.2% was used as a sheath yarn, and was wound at a spinning speed of 1000 m / min.
Doubled to 75d / 34f, Young's modulus 100g /
d, a drawn yarn having a boiling water shrinkage of 24% was obtained.

The obtained yarn of the sheath portion and the yarn of the core portion obtained in Example 1 are interlaced by increasing the yarn length of the yarn of the sheath portion to 8% more than that of the yarn of the core portion and interlaced. A sheath-core composite mixed fiber having a number of 30 / m was obtained. This yarn was made into a satin woven fabric having a warp density of 194 yarns / inch and a weft density of 94 yarns / inch, and dyed and finished in a usual process. The evaluation results of the woven fabric are shown in Table 1.

[0029]

[Comparative Example 2] Interlace processing was performed under the same conditions as in Example 1 except that the cross section of the yarn of the sheath portion was formed into a triangular irregular cross section.
Woven and dyed. The evaluation results are shown in Table 1.

[0030]

Comparative Example 3 The sheath-core composite mixed yarn obtained in Comparative Example 2 has 80
A knitted fabric was obtained in the same manner as in Example 2 by applying S and Z twists of 0 times / m. The evaluation results are shown in Table 1.

[0031]

[Comparative Example 4] A woven fabric was obtained in the same manner as in Example 1 except that the cross section of the yarn of the core portion was made non-typical. The evaluation results are shown in Table 1.

[0032]

[Table 1]

[0033]

EFFECT OF THE INVENTION The polyester-sheath core composite mixed yarn of the present invention has an appropriate tension, waist, and
It is possible to obtain a medium-thick woven or knitted fabric having a drape property, a soft swelling feeling, and a bathochromic property with no flicker.

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Claims (1)

[Claims] 1. A mixed filament yarn having a core portion composed of two types of polyester cross-filament yarns having different cross-sections having a boiling water shrinkage of 6% or more, and a sheath portion wound at a rate of 3500 m / min or more and a Young's modulus of 70 to 20 g. / D non-atypical cross-section polyester multifilament yarn, wherein the yarn length of the filament yarn of the sheath portion is 5 to 20% longer than the yarn length of the mixed yarn of the core portion. Yarn.