JP4706103B2 - Polyester blended yarn - Google Patents

Description

【００４３】
【発明の効果】
本発明のポリエステル混繊糸は、鞘糸の単糸の初期ヤング率が芯糸の単糸の初期ヤング率よりも大幅に小さいこと、鞘糸の芯部を構成するポリスチレンが連続的に破断していることで織編物にしたときにソフトでしなやかな表面感を有し、さらには２種のマルチフィラメント間の熱収縮差に起因する糸長差によって、織編後の通常の染色加工を実施することによって大きなふくらみを有するものである。
【図面の簡単な説明】
【図１】本発明にかかる芯鞘型複合マルチフィラメントの単糸の一例を示す繊維軸方向の断面図である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polyester blend comprising a core / sheath composite multifilament A in which polystyrene is the core and polyester is the sheath, and a polyester multifilament B in which a third component exhibiting high shrinkage is copolymerized. It relates to yarn. More specifically, after the mixed yarn is made into a woven or knitted fabric, it is possible to express a soft and supple surface feeling on the woven or knitted fabric by carrying out a normal dyeing process. The present invention relates to a polyester mixed yarn that can impart a large bulge to a woven or knitted fabric due to a difference in yarn length caused by a shrinkage difference.
[0002]
[Prior art]
Since polyester has excellent mechanical properties, it is used in a wide range of fields from apparel use to material use. In clothing applications, development has been progressing for the purpose of imparting the texture and functionality of natural fibers.
[0003]
In order to obtain a woven or knitted fabric rich in swell and softness, it is effective to impart a reasonably large yarn length difference between the constituting filaments. Conventionally, as a means for imparting this difference in yarn length, two or more types of multifilaments having different properties such as shrinkage, elongation, and single yarn fineness are separately spun and then mixed in subsequent steps such as a drawing step and false twisting step. The post-mixing method is widely used.
[0004]
As an example, in order to give a larger shrinkage difference in a mixed fiber using a shrinkage difference, a high shrinkage yarn that becomes a core yarn and a so-called spontaneous stretch yarn that exhibits elongation behavior by heat treatment that becomes a sheath yarn are spun separately. Recently, attention has been paid to a means for increasing a bulge by producing a woven or knitted fabric using a blended yarn that has been blended later, and developing a large yarn length difference in the subsequent normal dyeing process. Thus, in the post-mixing method, spinning conditions and drawing conditions can be set under conditions suitable for each multifilament, so it is very effective for increasing the yarn length difference between multifilaments. Since the yarns and sheath yarns are manufactured in separate processes, and then mixed afterwards, the number of processes is inevitably increased, resulting in a high cost.
[0005]
As a measure to solve these problems, a spinning and blending technique has been studied, and a method of simultaneously spinning two or more types of multifilaments having different polymer quality and single yarn fineness with the same die has been developed. For example, the core yarn is provided with a highly shrinkable yarn obtained by copolymerizing a third component exhibiting high shrinkage such as isophthalic acid, and the sheath yarn is provided with ordinary PET as a low shrinkage yarn. And then winding it up. When the mixed yarn obtained by stretching this is used for a woven or knitted fabric, a sufficient difference in shrinkage is exhibited, so that a sufficient swell feeling can be obtained. However, since the core yarn and sheath yarn have a great influence on the soft feeling of the woven or knitted fabric due to simultaneous spinning and simultaneous drawing, the initial Young's modulus of the woven and knitted fabric is also increased because of the same orientation promotion as the core yarn. However, there is a drawback that the surface becomes soft and unsatisfactory in terms of flexibility.
[0006]
In addition, in order to obtain a blended yarn that exhibits a yarn length difference in the dyeing process using the same polymer, a technique of spinning and blending two or more types of multifilaments having different single yarn fineness has been studied. Due to the difference in cooling rate in the spinning process due to the difference in yarn fineness, the multifilament with fine single yarn fineness becomes higher orientation than the multifilament with thick single yarn fineness, so the thermal shrinkage rate increases, and shrinkage occurs during the subsequent heat treatment When this is done, the multifilament with fine single yarn fineness will form the core of the blended yarn, and the multifilament with fine single yarn fineness will form the sheath, resulting in a tight touch when used as a woven or knitted fabric. It will occur.
[0007]
In the past, mixed yarns having a difference in degree of orientation using a substance having an effect of suppressing the orientation as in the present invention have been introduced. For example, Japanese Patent Publication No. 57-143522 discloses a similar technique based on the addition method, but the addition method has a problem of adverse effects due to the added polymer. For example, coloring failure due to the presence of the added polymer on the fiber surface, and thread breakage or dyeing unevenness may occur due to the unevenness of the addition.
[0008]
[Problems to be solved by the invention]
In order to solve the above-mentioned problems, the present invention is such that the sheath yarn is softer and more supple than the core yarn, and further, the difference in heat shrinkage between the two types of multifilaments by carrying out the normal dyeing process after weaving. It is an object of the present invention to provide a polyester blended yarn capable of giving a large swell and soft feeling to a woven or knitted fabric at a low cost by expressing a large yarn length difference due to the above.
[0009]
[Means for Solving the Problems]
The polyester blended yarn of the present invention has the following configuration in order to solve the above problems. (1) The core / sheath composite multifilament A in which polystyrene is the core and polyester is the sheath, and the polyester multifilament B in which the third component exhibiting high shrinkage is copolymerized, the core / sheath The initial Young's modulus of the single yarn of the mold composite multifilament A is Ea (cN / dtex), and the initial Young's modulus of the single yarn of the polyester multifilament B is Eb (cN / dtex) of the following formulas [1] to [2] Polyester mixed yarn characterized by satisfying the range.
[0010]
20 ≦ Ea ≦ 50 [1]
50 ≦ Eb [2]
(2) The core / sheath composite multifilament A in which polystyrene is the core and polyester is the sheath, and the polyester multifilament B in which the third component exhibiting high shrinkage is copolymerized, the core / sheath (1), wherein the polystyrene constituting the core part of the mold composite multifilament A is intermittently broken in the fiber axis direction, and the distance between the adjacent broken parts and the broken parts is 5 mm or less. polyester combined filament yarn.
[0011]
(3) The average breaking elongation of single yarn of polyester multifilament B is 30% or more and 70% or less, and the average breaking elongation of single yarn of core / sheath type composite multifilament A is the average of single yarn of polyester multifilament B above, wherein the more than 20% greater elongation at break (1) or a polyester combined filament yarn according to (2).
[0012]
(4) The yarn length difference between the split yarns of the core / sheath type composite multifilament A and the polyester multifilament B after carrying out a dry heat treatment at 180 ° C. after boiling is 10% or more and 40% or less. The polyester blended yarn according to any one of (1) to (3).
[0013]
(5) The single yarn fineness Da of the multifilament A and the single yarn fineness Db of the polyester filament B satisfy the relationship of the following formula [3]. The polyester blended yarn described.
[0014]
Da ≦ Db (3)
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail.
[0016]
First, the blended yarn of the present invention comprises a core / sheath type composite multifilament A in which polystyrene is the core and polyester constitutes the sheath, and a polyester multifilament B in which a third component exhibiting high shrinkage is copolymerized. It has been done.
[0017]
The reason why the multifilament A is a core / sheath type composite yarn having polystyrene as the core and polyester as the sheath is that the polystyrene polymer utilizes the effect of suppressing the orientation promotion of the polyester polymer.
[0018]
Because of this effect, when a polyester polymer compounded with a polystyrene polymer and a polyester polymer exhibiting high shrinkage are spun simultaneously, the former becomes a filament with a lower orientation than the latter, resulting in a low shrinkage and high elongation yarn. The yarn has an initial Young's modulus smaller than that of the yarn. Accordingly, since the bending rigidity is also reduced, a soft and supple texture can be expressed when a woven or knitted fabric is formed.
[0019]
In the multifilament A, it is important that the core polystyrene is present in a certain amount in the fiber axis direction excluding the fracture portion and is not exposed on the fiber surface. If this is satisfied, the core / sheath composite form is not particularly limited, and the core may be eccentric or concentric.
[0020]
The composite ratio of the multifilament A polystyrene is preferably 3 to 10% by weight, and more preferably 4 to 6% by weight. When the content is less than 3%, the effect of suppressing the orientation by polystyrene is poor, and the required difference in the initial Young's modulus between the core yarn and the sheath yarn cannot be obtained. On the other hand, if it exceeds 10%, the polyester constituting the sheath part may be cracked to cause a decrease in strength, and if it is severe, polystyrene will jump out of the crack, which is not preferable.
[0021]
Since the multifilament A becomes a low-shrinkage side yarn due to the shrinkage behavior during the heat treatment in the dyeing step, it forms the sheath portion of the blended yarn and thus forms the surface portion of the woven or knitted fabric. Therefore, it is important that the initial Young's modulus Ea of the single yarn of the multifilament A is 50 cN / dtex or less in order to give a sufficient soft feeling to the woven or knitted fabric, and if it exceeds 50 cN / dtex, a soft surface touch can be obtained. It will not be possible. On the other hand, if the initial Young's modulus is too small, that is, if the degree of orientation is too low, the breaking elongation of the yarn increases, and a frosting problem occurs when a woven or knitted fabric is formed. It is important that the initial Young's modulus Ea is 20 cN / dtex or more so that the breaking elongation of the yarn does not become too large.
[0022]
In the multifilament A, it is important that polystyrene constituting the core portion is intermittently broken in the fiber axis direction. As a result, the bending moment of the broken portion of the multifilament A becomes smaller than the bending moment of the non-ruptured portion. Therefore, in synergy with the effect of low initial Young's modulus by suppressing the orientation, the blended yarn becomes softer and more supple. It is possible to give a unique touch. At this time, if the distance between the adjacent fracture portions (see FIG. 1) is large, the effect of reducing the bending moment is lost. Therefore, it is important that the gap is 5 mm or less, preferably 3 mm or less.
[0023]
In order to give a large swell and soft feeling to the knitted or knitted fabric, it is necessary to increase the gap between the fibers. For that purpose, it is important to increase the difference in the yarn length between the core yarn and the sheath yarn. . Accordingly, it is important that the polyester multifilament B serving as the core yarn exhibits high shrinkage. For this reason, in the present invention, polyester obtained by copolymerizing a third component exhibiting high shrinkage such as isophthalic acid is used. is there.
[0024]
Polyester multifilament B constitutes the core of the blended yarn due to the shrinkage behavior during heat treatment in the dyeing process, and has a great influence on the resilience, firmness and firmness of the woven or knitted fabric. In order to achieve this, it is important that the initial Young's modulus Eb of the single yarn of the multifilament B is 50 cN / dtex or more.
[0025]
When the mixed yarn of the present invention is used as a woven or knitted fabric, the polyester multifilament B constitutes the core of the mixed yarn and greatly affects the tear strength of the woven or knitted fabric. If the average breaking elongation of the single yarn is less than 30%, fluffing may occur in the weaving preparation process and the like, causing problems in process passability, and causing a decrease in tear strength after weaving. It is important that the average breaking elongation of the single yarn of the polyester multifilament B is 30% or more. However, if the average breaking elongation of the single yarn of the core yarn of the blended yarn is too large, a problem of a gloss will occur in the woven or knitted fabric. Therefore, the average breaking elongation of the single yarn of the polyester multifilament B is 70% or less. This is very important. However, if the core / sheath type composite multifilament A constituting the sheath portion of the mixed fiber is also a drawn yarn highly oriented to the same degree as the polyester multifilament B, there is a problem that the slime feeling becomes strong. However, since this slime feeling is eliminated as the elongation increases, the average breaking elongation of the single yarn of the core / sheath type composite multifilament A is 20% or more larger than the average breaking elongation of the single yarn of the polyester multifilament B. This is very important.
[0026]
Moreover, in order to give sufficient swelling to the woven or knitted fabric, when the mixed yarn is subjected to boiling treatment for 30 minutes and then subjected to dry heat treatment at 180 ° C. for 15 minutes, the multifilament A and the polyester multifilament B are separated from each other. The difference in yarn length is preferably 10% or more, but conversely, if it is too large, a woven or knitted fabric with a strong feeling of wiping is obtained, so it is important that the difference in the length of the decomposed yarn is 40% or less.
[0027]
The mixed yarn of the present invention is not limited in fineness, single yarn fineness, number of filaments, and cross-sectional shape. For example, the cross-sectional shape may be an irregular cross-section such as a hollow shape or a three-leaf shape. Such differences may exist. However, in order to give the woven or knitted fabric a resilience and soft feeling, it is preferable to increase the single yarn fineness of the core yarn that contributes to the resilience and to reduce the fineness of the sheath yarn that contributes to the soft feeling. It is preferable that the single yarn fineness Db of the multifilament B serving as the yarn is greater than or equal to the single yarn fineness Da of the multifilament A serving as the sheath yarn. That is, it is preferable that the relationship of Da ≦ Db is satisfied.
[0028]
Further, the polyester portion of the multifilament A and the polyester multifilament B may be those to which particles are added for the purpose of improving color development or matting.
[0029]
【Example】
EXAMPLES Next, although an Example and drawing demonstrate this invention concretely, this invention is not limited by this. The physical property values described in the text and in the examples are based on the following measuring methods.
(1) An initial Young's modulus mixed yarn of a single yarn is disassembled into individual single yarns, and then a tensile test is performed at a test length of 2 cm and a tensile speed of 2 cm / min using an Instron tensile tester. The straight line of the rise curve of the obtained SS curve is extended to determine the strength at an elongation of 100% and the value is divided by the single yarn fineness (cN / dtex). The average value of the measured values of five different single yarns for each of the core yarns and sheath yarns (when the number of single yarns is insufficient, a plurality of samples are taken from the same single yarn) is taken as the measurement value. The distinction between the core yarn and the sheath yarn can be clearly distinguished from the shape of the SS curve.
(2) After breaking the average breaking elongation mixed yarn of single yarns into single yarns one by one, measurement is performed at a test length of 2 cm and a tensile speed of 2 cm / min using an Instron tensile tester. The average value of 5 measurements is taken as the measurement value. The distinction between the core yarn and the sheath yarn can be clearly distinguished from the shape of the SS curve.
(3) Separation of blended yarns at the broken part of polystyrene into single yarns, taking a photograph with an optical microscope, and obtaining the average value of the distances between the broken parts and the broken parts at five points for the single sheath yarn. This is measured for 10 single sheath yarns (when the number of single yarns is insufficient, a plurality of samplings are performed from the same single yarn), and the average value thereof is taken as the measured value (FIG. 1).
(4) Decomposed yarn yarn length difference Take out a yarn of an appropriate length and carefully disassemble it into single yarns one by one so that the fibers themselves do not stretch. The disassembled single yarn is placed on a scale plate coated with glycerin and stretched to such an extent that crimps and wrinkles are eliminated, and the length L of one single yarn is measured (up to 1 mm unit). The short single yarn group and the long single yarn group are classified, and the average length of the short single yarn group is L1, and the long single yarn group is L2, and is calculated by the following equation. The average value of 5 measurements is taken as the measured value.
[0030]
Decomposed yarn length difference (%) = {(L2−L1) / L1} × 100
(5) Texture characteristics Measured with a cloth test system (KES) designed for measuring the texture of cloth manufactured by Kato Tech Co., Ltd.
[0031]
Example 1
Three-leaf cross-section polyester copolymerized with 8 mol% of isophthalic acid, 5 mol% of 2-2bis [4- (2-hydroxyethoxy) phenyl] propane, and a total of 87 mol% of ethylene glycol and terephthalic acid. A three-leaf cross-section polyester compounded with 4.5% by weight of polystyrene was simultaneously spun and mixed with the same die at a spinning speed of 3000 m / min, and then normally stretched to obtain 60 dtex-36 filament (core yarn: 30 dtex-18). Filament, sheath yarn: 30 dtex-18 filament) was obtained.
[0032]
The obtained blended yarn was disassembled into single yarns one by one, and the initial Young's modulus was determined from the strength and elongation curves obtained by measuring the strength and elongation of each single yarn. The initial Young's modulus Eb of a single filament of a multifilament (which will be referred to as a core yarn when it is formed into a woven or knitted fabric) is 58.7 cN / dtex. The initial Young's modulus of a single yarn (which is sometimes referred to as a sheath yarn since it sometimes constitutes a sheath yarn) was 27.3 cN / dtex. The difference in the length of the decomposed yarn between the core and the sheath after the mixed yarn was subjected to the boil-off treatment and the dry-collection treatment at 180 ° C. was 27.8%. Further, the breaking elongation of the single yarn of the core yarn was 28.1%, and the breaking elongation of the single yarn of the sheath yarn was 64.2%. Furthermore, the space | interval of an adjacent fracture | rupture part and a fracture | rupture part was 2.2 mm.
[0033]
Next, this mixed fiber was subjected to a real twist of 200 T / m, glued and then warped, and a normal polyester drawn yarn of 83 dtex-72 filaments as a horizontal yarn was S twisted and Z twisted, and 2500 T / m actual twisted yarn, respectively. Satin was woven using two pieces alternately. The woven fabric was scoured relaxed, set at 180 ° C., subjected to 17% alkali weight reduction, subsequently dyed with disperse dye using a liquid dyeing machine, and finally set at 160 ° C. The obtained woven fabric had a large bulge and a soft texture, and had a supple surface feel. Table 1 shows the yarn physical properties and KES texture characteristics.
[0034]
(Example 2)
A round hollow polyester obtained by copolymerizing 8 mol% of isophthalic acid, 5 mol% of 2-2bis [4- (2-hydroxyethoxy) phenyl] propane, and a total of 87 mol% of ethylene glycol and terephthalic acid, and polystyrene at the core. A three-leaf cross-section polyester compounded with 4.5% by weight in the same ratio is simultaneously spun and blended at the spinning speed of 3000 m / min with the same die, and then usually stretched to 60 dtex-27 filament (core yarn: 30 dtex-9 filament) , Sheath yarn 30 dtex-18 filament).
[0035]
The initial Young's modulus of the single yarn of the core yarn of the blended yarn was 65.5 cN / dtex, and the initial Young's modulus of the single yarn of the sheath yarn was 27.4%. Further, the difference in the length of the decomposed yarn between the core and sheath after the mixed yarn was subjected to the boil-off treatment and the dry harvesting treatment at 180 ° C. was 29.1%. Furthermore, the breaking elongation of the single yarn of the core yarn was 29.1%, and the breaking elongation of the single yarn of the sheath yarn was 68.1%. Furthermore, the space | interval of an adjacent fracture | rupture part and a fracture | rupture part was 3.2 mm.
[0036]
This mixed fiber was subjected to a real twist of 200 T / m in the same manner as in Example 1 and then subjected to gluing to obtain a warp yarn, and the same weaving and finishing as in Example 1 were performed to obtain a woven fabric. The obtained woven fabric had a large bulge and a soft texture like the woven fabric obtained in Example 1. Table 1 shows the yarn physical properties and KES texture characteristics.
[0037]
(Comparative Example 1)
Three-leaf cross-sectional polyester obtained by copolymerizing 8 mol% of isophthalic acid, 5 mol% of 2-2bis [4- (2-hydroxyethoxy) phenyl] propane, and a total of 87 mol% of ethylene glycol and terephthalic acid, and ordinary 3 The cross-sectional polyester of the leaf was spun and mixed with the same die at a spinning speed of 3000 m / min, and then normally stretched to mix 55 dtex-24 filaments (core yarn: 27.5 dtex-12 filament, sheath yarn: 27.5 dtex-12 filament) A yarn was obtained. When the initial Young's modulus of the obtained mixed fiber was measured in the same manner as in Example 1, the difference between the core yarn and the sheath yarn was not clear, and the initial Young's modulus was 63 cN / s with almost the same SS curve. dtex. Further, the difference in the length of the decomposed yarn between the core and the sheath after the mixed yarn was subjected to the boil-off treatment and the dry harvesting treatment at 180 ° C. was 24.2%. Furthermore, the breaking elongation of the single yarn of the core yarn was 31.1%, and the breaking elongation of the single yarn of the sheath yarn was 34.1%.
[0038]
This mixed yarn is subjected to a 200 T / m actual twist, glued to make a warp yarn, and as a weft yarn, an ordinary polyester drawn yarn of 83 dtex-72 filaments is S-twisted and Z-twisted, and two yarns each having a 2500 T / m actual twist alternately Used to weave satin. Although the fabric after weaving was finished in the same dyeing process as in Example 1, the swell was moderate, but it lacked softness and lacked the surface feeling. Table 1 shows the yarn physical properties and KES texture characteristics.
[0039]
(Comparative Example 2)
A normal three-leaf cross-section polyester not copolymerized with isophthalic acid and a three-leaf cross-section polyester in which 4.5% of polystyrene is combined in the core are spun and mixed with the same die at a spinning speed of 3000 m / min, and then usually stretched. , 60 dtex-36 filament (core yarn: 30 dtex-18 filament, sheath yarn: 30 dtex-18 filament).
[0040]
The initial Young's modulus of the single yarn of the core yarn of the blended yarn was 60.7 cN / dtex, and the initial Young's modulus of the single yarn of the sheath yarn was 26.5 cN / dtex. Further, the difference in the length of the decomposed yarn between the core and the sheath after the mixed yarn was subjected to the boil-off treatment and dry-drying treatment at 180 ° C. was 8.9%. Further, the breaking elongation of the single yarn of the core yarn was 30.5%, and the breaking elongation of the single yarn of the sheath yarn was 70.5%.
[0041]
When the obtained mixed fiber was twisted at 200 T / m and woven with the same woven fabric as in Example 1, a soft surface was obtained, but the swelled feeling was lacking. Table 1 shows the yarn physical properties and KES texture characteristics.
[0042]
[Table 1]

[0043]
【The invention's effect】
In the polyester blended yarn of the present invention, the initial Young's modulus of the single yarn of the sheath yarn is significantly smaller than the initial Young's modulus of the single yarn of the core yarn, and the polystyrene constituting the core portion of the sheath yarn is continuously broken. As a result, it has a soft and supple surface when it is made into a woven or knitted fabric, and the normal dyeing process after weaving and knitting is performed due to the difference in yarn length caused by the difference in thermal shrinkage between the two types of multifilaments. It has a big bulge by doing.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view in the fiber axis direction showing an example of a single yarn of a core-sheath type composite multifilament according to the present invention.

Claims (5)

The core / sheath type composite multifilament A in which polystyrene is the core and polyester is the sheath, and the polyester multifilament B in which the third component exhibiting high shrinkage is copolymerized, the core / sheath type composite multifilament The initial Young's modulus Ea (cN / dtex) of the single yarn of filament A and the initial Young's modulus Eb (cN / dtex) of the single yarn of polyester multifilament B satisfy the ranges of the following formulas [1] to [2]. Characteristic polyester blend yarn.
20 ≦ Ea ≦ 50 [1]
50 ≦ Eb [2] The core / sheath type composite multifilament A in which polystyrene is the core and polyester is the sheath, and the polyester multifilament B in which the third component exhibiting high shrinkage is copolymerized, the core / sheath type composite multifilament 2. The polyester blend according to claim 1, wherein the polystyrene constituting the core part of the filament A is intermittently broken in the fiber axis direction, and an interval between adjacent broken parts is 5 mm or less. yarn.   The average breaking elongation of the single yarn of the polyester multifilament B is 30% or more and 70% or less, and the average breaking elongation of the single yarn of the core / sheath type composite multifilament A is the average breaking elongation of the single yarn of the polyester multifilament B. The polyester blend yarn according to claim 1 or 2, wherein the polyester blend yarn is 20% or more larger.   The yarn length difference between the split yarns of the core / sheath type composite multifilament A and the polyester multifilament B after carrying out a dry heat treatment at 180 ° C. after the boil-off treatment is 10% or more and 40% or less. The polyester mixed yarn according to any one of 1 to 3. The polyester mixed yarn according to any one of claims 1 to 4, wherein the single yarn fineness Da of the multifilament A and the single yarn fineness Db of the polyester filament B satisfy the relationship of the following formula [3].
Da ≦ Db (3)

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