JP2004084102A - Polyester composite yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester composite yarn capable of simultaneously expressing both spun yarn texture and stretchability in woven fabrics. <P>SOLUTION: The substantially twistless polyester composite yarn comprises discontinuous fibers and continuous fibers, wherein the discontinuous fibers are obtained by stretch-breaking polyethylene terephthalate multifilaments 0.5-2.5 dtex in single filament fineness and the continuous fibers are polytrimethylene terephthalate multifilaments. <P>COPYRIGHT: (C)2004,JPO

Description

【００３６】
［比較例１］
元糸ｂを、表１に示す物性を有するポリエチレンテレフタレートマルチフィラメントとする以外は、実施例１と同じ方法、条件で、表１の特性を有するポリエステル複合糸を得た。
【００３７】
表１から明らかなように、本例のポリエステル複合糸からの織物では、ストレッチ性は全く発現しなかった。
【００３８】
［実施例２〜３、比較例２〜３］
表２に示す特性・物性を有する元糸ａおよび元糸ｂを使用する以外は実施例１と同じ方法、条件で、表２の特性を有するポリエステル複合糸を得た。
【００３９】
表２から明らかなように、実施例２〜３のポリエステル複合糸からの織物では、優れた紡績糸風合いと同時に充分なストレッチ性が発現した。一方、比較例２のポリエステル複合糸からの織物は、表面にスラブあるいはネップが散在し、粗野な外観を呈していた。比較例３のポリエステル複合糸からの織物は、表面が硬い感触であり、ナチュラルな触感が乏しいものであった。
【００４０】
【表２】

【００４１】
【発明の効果】
本発明のポリエステル複合糸によれば、織物に紡績糸風合いおよびストレッチ性とを同時に発現することができる。
【図面の簡単な説明】
【図１】本発明のポリエステル複合糸側面の１実施態様を示した模式図。
【図２】本発明のポリエステル複合糸を製造する方法の１実施態様を示した模式図。
【符号の説明】
Ａ　：　連続繊維
Ｂ１：　単糸自由端
Ｂ２：　ループ
１　：　不連続繊維元糸
２　：　連続繊維元糸
３　：　送り出しローラー
４　：　樋状ガイド
５　：　けん切ローラー
６　：　糸ガイド
７　：　張力調整装置
８　：　引き取りノズル
９　：　抱合ノズル
１０：　引き取りローラー
１１：　ワインダー
１２：　ポリエステル複合糸[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a polyester composite yarn that simultaneously exhibits the natural feeling and the stretch property of a spun yarn on a woven fabric.
[0002]
[Prior art]
Conventionally, polyester composite yarns combining continuous fibers (hereinafter sometimes referred to as long fibers or multifilaments) and discontinuous fibers (hereinafter sometimes also referred to as short fibers) have a natural touch and appearance (hereinafter, referred to as spliced yarn). Many proposals have been made as a fiber material that can simultaneously exhibit the desired waist, rebound, and drape properties provided by the long fiber and the long fiber.
[0003]
In particular, the polyester multifilament is `` chopped '' to form a short fiber component, and then the separately introduced polyester multifilament and the short fiber component are conjugated by a fluid treatment, and the composite yarn that is untwisted and wound is a spun yarn. Compared to "core spun yarn" in which long fibers are combined in the spinning process, it is more advantageous in terms of production cost, and various studies for practical use have been made.
[0004]
For example, Japanese Patent Application Laid-Open No. Sho 60-39426 discloses that a continuous fiber having a single-fiber fineness of 0.8 denier or less and a continuous fiber having a single-fiber fineness of 1.2 denier or more obtained by “cutting” are disclosed. A polyester composite yarn is disclosed. Certainly, the woven fabric from the polyester composite yarn obtained by the above-described method has a spun yarn texture and a favorable waist / rebound property, drape property, but "stretch property" which is one index of clothing comfort. There was a problem that there was a shortage.
[0005]
[Problems to be solved by the invention]
The present invention has been made against the background of the above-mentioned conventional technology, and an object of the present invention is to provide a polyester composite yarn that simultaneously exhibits a spun yarn texture and a stretch property in a woven fabric.
[0006]
[Means for Solving the Problems]
As a result of intensive studies, the inventor of the present invention has found that the above problem is "a composite yarn comprising discontinuous fibers and continuous fibers, wherein the discontinuous fibers have a single-fiber fineness of 0.5 to 2.5 dtex. A fiber obtained by “cutting” a polyethylene terephthalate multifilament, wherein the continuous fiber is a polytrimethylene terephthalate multifilament and is substantially non-twisted. Found to be.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
The polyester composite yarn of the present invention is a composite yarn composed of discontinuous fibers and continuous fibers, and the discontinuous fibers are fibers obtained by “cutting” polyethylene terephthalate multifilaments. FIG. 1 shows an embodiment (schematic diagram) of the polyester composite yarn of the present invention. A part of the discontinuous fiber is cut by “cutting” and protrudes as a free end (B1), and another part is a loop (B2) and exists in the composite yarn. Further, in the composite yarn of the present invention, as shown in FIG. 1, it is preferable that the free end (B1) and the loop (B2) of the discontinuous fiber are coordinated so as to conjugate the continuous fiber (A).
[0008]
Here, the discontinuous fiber is composed of a fiber bundle obtained by “cutting” a polyethylene terephthalate multifilament having a single yarn fineness of 0.5 to 2.5 dtex, preferably 0.8 to 1.5 dtex. It is necessary to be. In the present invention, polyethylene terephthalate means a polyester in which ethylene terephthalate occupies 85 mol% or more, preferably 95 mol% or more as a repeating unit, and a small amount of components other than the terephthalic acid component and / or the ethylene glycol component. (Normally 15 mol% or less based on the terephthalic acid component) Also includes those copolymerized. Its intrinsic viscosity (measured using an ortho-chlorophenol solution at 35 ° C. as a solvent) is about 0.45 to 0.70, and more preferably 0.55 to 0.70, which is about the same level as polyester usually used as a cloth material for clothing. 0.67 is desirable. Further, known additives such as pigments, dyes, matting agents, antifouling agents, fluorescent brighteners, flame retardants, stabilizers, ultraviolet absorbers, lubricants, and the like may be blended.
[0009]
When the single-filament fineness of the polyethylene terephthalate multifilament is less than 0.5 dtex, the entanglement of the constituent single-yarns is increased, and "cutting" spots occur, many slabs or neps are generated on the surface of the woven fabric, and the appearance quality is poor. It will be. When the single yarn fineness exceeds 2.5 dtex, the woven fabric surface gives a hard touch.
[0010]
The polyethylene terephthalate multifilament preferably has a strength of 1.5 to 4.0 cN / dtex, an elongation of 20 to 40%, and a boiling water shrinkage of 0 to 15%.
[0011]
The cross-sectional shape of the fiber of such a polyethylene terephthalate multifilament is not particularly limited, and may be circular or multi-lobed, or may be hollow.
[0012]
Next, the continuous fiber which is one of the components of the polyester composite yarn of the present invention must be a polytrimethylene terephthalate multifilament. In the present invention, the term "polytrimethylene terephthalate" means a polyester in which at least 80 mol%, preferably at least 85%, of all the repeating units are trimethyleneterephthalate. The polyester may be obtained by copolymerizing components other than terephthalic acid and 1,3-propanediol in an amount of 20 mol% or less, preferably 15 mol% or less, based on all the acid components. Examples of preferably used copolymer components include phthalic acid, isophthalic acid, naphthalenedicarboxylic acid, 5-sodium sulfoisophthalic acid, adipic acid, sebacic acid, and the like as an acid component, and ethylene glycol as a glycol component. Butylene glycol, neopentyl glycol, bisphenol A, 2,2-bis {4- (β-hydroxyethoxy) phenyl} propane and the like can be exemplified. Its intrinsic viscosity (measured at 35 ° C. using orthochlorophenol as a solvent) is preferably an intrinsic viscosity of 0.7 to 1.5 in the same category as polytrimethylene terephthalate which is usually used for fabric materials for clothing. . Further, known additives such as pigments, dyes, matting agents, antifouling agents, fluorescent brighteners, flame retardants, stabilizers, ultraviolet absorbers, lubricants, and the like may be blended.
[0013]
Such a polytrimethylene terephthalate multifilament has a function of imparting a stretch property to the woven fabric, and is preferably arranged mainly on the core side of the polyester composite yarn. Usually, when the elongation rate of the woven fabric is 10 to 20%, it is said that a stretch property for obtaining clothing comfort is exhibited (also referred to as comfort stretch). Here, when the elastic recovery of the polytrimethylene terephthalate multifilament at 10% elongation is 90% or more, more preferably 95% or more, the stretchability of the woven fabric is more strongly exhibited.
[0014]
In addition, the single fiber fineness of the polytrimethylene terephthalate multifilament is preferably in the range of 1 to 5 dtex in order to balance the stiffness / rebound and soft feel of the woven fabric.
[0015]
The polytrimethylene terephthalate multifilament preferably has a strength of 2 to 3.5 cN / dtex and an elongation of 30 to 50% for use in woven fabrics. If the boiling water shrinkage is at least 5% higher than the discontinuous fiber base yarn (polyethylene terephthalate multifilament), the continuous fibers will be more coordinated to the core side by the heat treatment in the dyeing and finishing of the woven fabric. preferable.
[0016]
The cross-sectional shape of the fiber is not particularly limited, and may be circular or multi-lobed, or may have a hollow.
[0017]
The polyester composite yarn of the present invention is used as a non-twisted yarn or as a twisted yarn having a free number of twists because the discontinuous fiber and the continuous fiber having the above-mentioned properties are formed into a composite in a substantially non-twisted state. be able to. Here, the “substantially non-twisted state” refers to a state in which twisting is not actively performed by the twisting machine, and a minute twist (10 to 30 times / m) generated at the time of winding the spindle or at the time of unwinding the package. The resulting untwist is substantially untwisted.
[0018]
Further, the composite weight ratio of the discontinuous fiber to the continuous fiber (discontinuous fiber / continuous fiber) is preferably in the range of 70/30 to 50/50 in view of the balance between the stiffness / repulsion and the soft feel of the woven fabric. Therefore, the total fineness of each fiber may be set so that the total fineness of the polyester composite yarn is in the range of 120 to 400 dtex and the above composite weight ratio.
[0019]
The polyester composite yarn of the present invention can be manufactured by, for example, an apparatus having a process as shown in FIG.
First, a polyethylene terephthalate multifilament and a polytrimethylene terephthalate multifilament are produced according to a conventional method. At this time, it is preferable that the polyethylene terephthalate multifilament is made into a cheese-like package by a spinning direct drawing method in which a melt spinning step and a drawing step are connected, in order to effectively perform “cutting”. Further, in order to improve the efficiency of “cutting”, it is preferable to apply a spinning oil agent that does not have a high thread bundle property.
[0020]
On the other hand, the polytrimethylene terephthalate multifilament may be in the shape of a pan or cheese, or may be provided with a usual spinning oil.
[0021]
Next, the polyethylene terephthalate multifilament is used as a discontinuous fiber base yarn (1 in FIG. 2), and the polytrimethylene terephthalate multifilament is used as a continuous fiber base yarn (2 in FIG. 2). Hang on the multifunction device.
[0022]
The polyethylene terephthalate multifilament is drafted 1.3 to 3 times between the delivery roller (3 in FIG. 2) and the chopping roller (5 in FIG. 2) and is "chopped". At this time, it is preferable to provide a gutter-like guide (4 in FIG. 2) so that the running of the polyethylene terephthalate multifilament is not disturbed by the accompanying airflow. On the other hand, the polytrimethylene terephthalate multifilament passes through the yarn guide (6 in FIG. 2) and is adjusted by a tension adjusting device (7 in FIG. 2) so that the yarn tension is in the range of 0.3 to 1.0 cN / dtex. After being adjusted, it is drawn through a chopping roller (5 in FIG. 2) and aligned with the polyethylene terephthalate multifilament by a take-off nozzle (8 in FIG. 2). Next, the aligned two yarns are composited by a tying nozzle (9 in FIG. 2), and a take-up roller (10 in FIG. 2), and a polyester composite yarn (FIG. 2) by a winder (11 in FIG. 2). It is wound up as 12) of 2).
[0023]
The polyester composite yarn thus obtained, when formed into a woven fabric, exhibits comfort stretch (10 to 20% stretchability) together with excellent spun yarn texture. In addition, the polyester composite yarn of the present invention may be used for a knitted fabric.
[0024]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples. Each item in the examples was measured by the following method.
[0025]
(1) Intrinsic viscosity Orthochlorophenol was used as a solvent and measured at 35 ° C.
[0026]
(2) Elastic recovery rate (at 10% elongation)
It carried out based on the measuring method of the extension elastic modulus of JIS L10138.9. After leaving the fiber for 24 hours in a room where the temperature and humidity are controlled at 20 ° C. and 65% RH, the fiber is stretched 10% at a yarn length of 200 mm and a pulling speed of 20 mm / min. The residual strain (mm) when the load became the same was read, and the elastic recovery rate was determined by the following equation.
Elastic recovery rate (%) = (L−L ₁ ) / L × 100
L: Elongation at 10% elongation (mm, here 20 mm)
L ₁ : Residual strain (mm)
[0027]
(3) Strength and elongation The fiber sample was subjected to a tensile test in accordance with the method of JIS L1013 8.5.1, and the strength and elongation at break were measured.
[0028]
(4) Boiling water shrinkage According to JIS L1013 8.18.1 B method, the sample was treated in boiling water for 30 minutes, air-dried, and the sample length before and after the treatment (under a predetermined load) was measured and determined by the following formula. .
Boiling water shrinkage (%) = (L ₀ −L ₁ ) / L ₀ × 100
L ₀ : sample length before processing, L ₁ : sample length after processing.
[0029]
(5) Evaluation of texture of woven fabric The polyester composite yarn sample was twisted at 600 turns / m, and a woven fabric having a twill structure was formed using warp yarns and weft yarns. Next, refining / relaxation treatment at 80 ° C, preset dry heat treatment at 160 ° C for 45 seconds, alkali reduction treatment of 10%, dyeing at 110 ° C for 30 minutes, natural drying, and final drying at 150 ° C for 45 seconds The fabric was set to obtain a texture evaluation fabric. An inspector sensory-tested the texture of the fabric and rated the following.
Level 1: A natural and uniform appearance similar to a spun yarn fabric, with moderate waist and rebound and a soft feel.
Level 2: Natural and uniform appearance, moderate moderate waist and rebound, and soft feel, but slightly inferior to Level 1.
Level 3: Slabs or neps are scattered on the surface of the woven fabric, giving a rough appearance. Alternatively, the fabric surface gives a hard feel.
[0030]
(6) Stretchability (elongation rate)
The woven fabric for texture evaluation obtained in the preceding section (5) was subjected to an extension test according to JIS L1096 8.14.1b (method B), and the extension rate (%) was calculated.
[0031]
[Example 1]
Polyethylene terephthalate having an intrinsic viscosity of 0.64 was melted by a conventional method, and a yarn was drawn by a direct spinning method to obtain a polyethylene terephthalate multifilament having physical properties shown in Table 1 having a total fineness of 163 dtex and a single yarn fineness of 1.5 dtex (hereinafter, referred to as a multifilament). (Referred to as a main thread a).
[0032]
Separately, polytrimethylene terephthalate having an intrinsic viscosity of 1.05 is melt-spun in a conventional manner, wound up once as an undrawn yarn, and then subjected to a drawing operation. A polytrimethylene terephthalate multifilament of 0.1 dtex was obtained (hereinafter referred to as a main yarn b).
[0033]
According to the cutting / compositing process diagram shown in FIG. 2, a polyester composite yarn having the properties shown in Table 1 was obtained by using the main yarn a as a discontinuous fiber main yarn and the main yarn b as a continuous fiber main yarn. At this time, a draft of 1.5 times was applied between the delivery roller (3 in FIG. 2) and the cutting roller (5 in FIG. 2). Further, the tension applied to the polytrimethylene terephthalate multifilament before being combined is adjusted by a tension adjusting device (7 in FIG. 2) so as to be 0.4 cN / dtex. Coordinated.
[0034]
The polyester composite yarn was formed into a woven fabric by the method described above (section (5)), and the texture and stretchability were evaluated. As is clear from Table 1, in the woven fabric of the polyester composite yarn of this example, sufficient stretchability was developed simultaneously with excellent spun yarn texture.
[0035]
[Table 1]

[0036]
[Comparative Example 1]
A polyester composite yarn having the properties shown in Table 1 was obtained in the same manner and under the same conditions as in Example 1 except that the main yarn b was a polyethylene terephthalate multifilament having the physical properties shown in Table 1.
[0037]
As is clear from Table 1, the woven fabric from the polyester composite yarn of this example did not exhibit any stretchability.
[0038]
[Examples 2-3, Comparative Examples 2-3]
A polyester composite yarn having the characteristics shown in Table 2 was obtained in the same manner and under the same conditions as in Example 1 except that the main yarn a and the main yarn b having the characteristics and physical properties shown in Table 2 were used.
[0039]
As is clear from Table 2, the woven fabrics of the polyester composite yarns of Examples 2 and 3 exhibited excellent spun yarn texture and sufficient stretchability at the same time. On the other hand, the woven fabric from the polyester composite yarn of Comparative Example 2 had a rough appearance with slabs or neps scattered on the surface. The woven fabric made of the polyester composite yarn of Comparative Example 3 had a hard feel on the surface and a poor natural feel.
[0040]
[Table 2]

[0041]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the polyester composite yarn of this invention, a spun yarn feeling and a stretch property can be simultaneously exhibited in a woven fabric.
[Brief description of the drawings]
FIG. 1 is a schematic view showing one embodiment of a side surface of a polyester composite yarn of the present invention.
FIG. 2 is a schematic view showing one embodiment of a method for producing a polyester composite yarn of the present invention.
[Explanation of symbols]
A: Continuous fiber B1: Single yarn free end B2: Loop 1: Discontinuous fiber original yarn 2: Continuous fiber original yarn 3: Sending roller 4: Gutter-shaped guide 5: Shearing roller 6: Thread guide 7: Tension adjusting device 8 : Take-up nozzle 9: Tying nozzle 10: Take-up roller 11: Winder 12: Polyester composite yarn

Claims (1)

A composite yarn comprising a discontinuous fiber and a continuous fiber, wherein the discontinuous fiber is a fiber obtained by “cutting” a polyethylene terephthalate multifilament having a single yarn fineness of 0.5 to 2.5 dtex. A polyester composite yarn, wherein the continuous fiber is a polytrimethylene terephthalate multifilament and is substantially non-twisted.

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