JPWO2005071149A1 - Polyester different shrinkage mixed yarn and method for producing the same - Google Patents

Abstract

In the polyester mixed yarn composed of the spontaneously stretchable polyester multifilament yarn A and the heat-shrinkable polyester multifilament yarn B, the polyester multifilament yarn A has a core portion and a length direction of the core portion. Polyester blended yarn comprising a plurality of fin portions projecting radially from the core portion and satisfying the following requirements (a) to (c) simultaneously. (A) 1/20 ≦ SB / SA ≦ 1/3 (b) 0.6 ≦ LB / DA ≦ 3.0 (c) WB / DA ≦ 1/4 (SA is the cross section of the core part, DA is the core part) When the cross section is a perfect circle, the diameter or the circumscribed circle diameter is represented when it is not a perfect circle, and SB, LB, and WB represent the cross-sectional area, maximum length, and maximum width of the fin portion, respectively.)

Description

  The present invention relates to a polyester mixed yarn comprising a self-extensible polyester multifilament yarn and a heat-shrinkable polyester multifilament yarn. More specifically, the present invention relates to a polyester mixed yarn that is particularly suitable for obtaining a fabric having both an unprecedented dry touch and high repulsion.

Woven and knitted fabrics are blended yarns consisting of spontaneously stretchable polyester multifilament yarns that stretch by heat treatment and heat-shrinkable polyester multifilament yarns that shrink by heat treatment. It has become widely used for applications.
Conventionally, in order to produce such a polyester mixed yarn, the separately produced spontaneously stretchable polyester multifilament yarn and heat-shrinkable polyester multifilament yarn are mixed with an air jet nozzle or subjected to relaxation heat treatment. While relaxing heat treatment of the polyester multifilament yarn that becomes spontaneously stretchable, the heat-shrinkable polyester multifilament yarn is continuously supplied to the spontaneously stretchable polyester multifilament yarn after the relaxation heat treatment. A method of mixing fibers (for example, see JP-A-1-250425) is used.
When such polyester blended yarn is used for, for example, a woolen-like woven fabric having a highly repellent wool-like touch, the spontaneously stretchable polyester multifilament yarn after the relaxation heat treatment is further added to a slit heater, a pipe heater, etc. A second relaxation heat treatment is performed at a high temperature using a non-contact type heater, and then mixed with a heat-shrinkable polyester multifilament yarn. In the second relaxation heat treatment, since the spontaneously stretchable polyester multifilament yarn sways in the non-contact heater and easily comes into contact with the heater, there is a problem that the leveling property deteriorates and yarn breakage is likely to occur. As a method for solving this, for example, Japanese Patent No. 3054059 discloses a method in which a relaxation heat treatment is performed after a polyester multifilament yarn and a heat-shrinkable polyester multifilament yarn that become spontaneously stretchable by a relaxation heat treatment are entangled in advance. Proposed.
However, with the polyester blended yarn obtained by these methods, although a soft and soft feel can be obtained, it has not been possible to obtain a soft and repellent fabric with an excellent dry touch feel.

The object of the present invention is to solve the above-mentioned problems of the prior art and to provide a fabric comprising a spontaneously stretchable polyester multifilament yarn and a heat-shrinkable polyester multifilament yarn, which has an unprecedented dry touch and high rebound. An object of the present invention is to provide a polyester blended yarn picked.
As a result of repeated investigations to solve the above problems, the present inventors have protruded radially from the core portion along the length direction of the core portion as a polyester multifilament yarn that becomes spontaneously stretchable. If a polyester multifilament yarn composed of a plurality of fins is used, a polyester mixed yarn suitable for obtaining a fabric having both an unprecedented dry touch and a high repulsion property can be obtained. The present inventors have found that the quality of the resulting mixed yarn can be improved by carrying out a relaxation heat treatment after entanglement of the polyester multifilament yarn and the heat-shrinkable polyester multifilament yarn in advance, thereby completing the present invention. .
That is, according to the present invention, in the polyester blended yarn composed of the spontaneously stretchable polyester multifilament yarn A and the heat-shrinkable polyester multifilament yarn B, the polyester multifilament yarn A includes a core portion and the core A polyester blend yarn comprising a plurality of fin portions projecting radially from the core portion along the length direction of the portion and satisfying the following requirements (a) to (c) simultaneously: Is done.
(A) 1/20 ≦ S _B / S _A ≦ 1/3
(A) 0.6 ≦ L _B / D _A ≦ 3.0
(C) W _B / D _A ≦ 1/4
(S _A is the cross section of the core portion, D _A when the cross section of the core portion is not a diameter also true circle when the perfect circle represents the circumscribed circle diameter, also S _B, respectively L _B and W _B fin portion Represents the cross-sectional area, maximum length and maximum width of
Further, according to the present invention, the polyester multifilament yarn A ′, which becomes the spontaneously stretchable polyester multifilament yarn A by performing relaxation heat treatment, is aligned with the heat-shrinkable polyester multifilament yarn B ′, and under overfeed. The polyester characterized by being supplied to an interlace nozzle and entangled, then subjected to a relaxation heat treatment to impart spontaneous elongation to the polyester multifilament yarn A ′, and further subjected to a second relaxation heat treatment by a non-contact heater. A method for producing a blended yarn is provided.

FIG. 1 is a sectional view showing an example of a filament cross section of a polyester multifilament yarn A according to the present invention.
FIG. 2 is a schematic view showing an example of a process for producing the polyester mixed yarn of the present invention.

The polyester used in the present invention is intended for a polyester having ethylene terephthalate as a main repeating unit, and is used in a small amount (usually 15 mol% or less) in order to improve dyeability, anti-pill property, heat shrinkage properties, and the like. , Preferably 10 mol% or less) may be copolymerized with the third component. Moreover, you may mix a small amount (usually 10 weight% or less with respect to polyester) other types of polymers. Further, an additive such as an antistatic agent, a matting agent, an ultraviolet absorber, and a dyeability improving agent may be blended.
The polyester blended yarn of the present invention is composed of a spontaneously stretchable polyester multifilament yarn A and a heat-shrinkable polyester multifilament yarn B, and the spontaneously stretchable polyester multifilament yarn A and the heat-shrinkable polyester multifilament. The yarn B may be composed of the same polyester, or may be composed of polyesters having different types and amounts of copolymerization component, mixed polymer, additive, and the like. Among them, the spontaneously stretchable polyester multifilament yarn is composed of polyethylene terephthalate, while the heat-shrinkable polyester multifilament yarn is copolymerized with about 5 to 15 mol% of an isophthalic acid component as a third component (total acid component Criteria) Those composed of polyethylene terephthalate are preferred.
The spontaneously stretchable polyester multifilament yarn A used in the present invention is an unstretched polyester yarn (usually called intermediately oriented yarn POY) spun at a relatively high spinning speed of about 2000 to 5000 m / min, or around 1000 m / min. It is obtained by subjecting a low-oriented polyester undrawn yarn or intermediate oriented yarn drawn at a spinning speed of 1 to a low heat treatment to a relaxation heat treatment. For example, a polyester low orientation undrawn yarn is stretched at a low magnification and then subjected to a shrinkage treatment of 20% or more at a temperature of 90 ° C. or lower, and an intermediate oriented yarn having a birefringence of 0.02 to 0.08 (glass transition point +20) A method of performing a relaxation heat treatment after drawing at a temperature of not higher than ° C., low-temperature drawing of a polyester intermediate oriented yarn (POY) having a birefringence index (Δn) of 0.03 or more spun at a spinning speed of 1500 to 4500 m / min. Thereafter, a relaxation heat treatment method, or a method in which the intermediate oriented yarn is stretched in the range of the secondary transition point (Tg) to Tg + 20 ° C. and then subjected to a relaxation heat treatment at a shrinkage ratio of 20% or more.
Therefore, the polyester multifilament yarn A ′ used when producing the polyester mixed yarn of the present invention means a polyester multifilament yarn in a state before being subjected to relaxation heat treatment for imparting spontaneous elongation, Specifically, it is a middle oriented yarn (POY) or a low magnification drawn yarn.
In the present invention, the spontaneously stretchable polyester multifilament yarn A is a polyester multifilament yarn comprising a core portion and a plurality of fin portions projecting radially from the core portion along the length direction of the core portion. lying, this time, as shown in FIG. 1, the cross-sectional area and diameter cross-sectional area of the S _a and D _{a, respectively,} and each fin portion (circumscribed circle diameter when the core portion is not a perfect circle) of the core portion, the maximum S _B length and maximum width, _{respectively,} when the L _B and W _B, it is important to satisfy the following requirements (a) to (c) simultaneously.
(A) 1/20 ≦ S _B / S _A ≦ 1/3
(A) 0.6 ≦ L _B / D _A ≦ 3.0
(C) W _B / D _A ≦ 1/4
Here, when 1/20> S _B / S _A or 1/3 <S _B / S _A , that is, the cross-sectional area is smaller than 1/20 or larger than 1/3 of the cross-sectional area of the core part. When a fin part exists, the dry touch feeling of the obtained mixed fiber is insufficient, which is not preferable.
Further, in the case of 0.6> L _B / D _A , that is, when there is a fin portion whose maximum length is less than 0.6 times the diameter of the core portion, the dry touch feeling of the obtained mixed yarn is insufficient. On the other hand, if 3.0 <L _B / D _A , that is, if there is a fin portion whose maximum length exceeds 3.0 times the diameter of the core portion, the fin portion is bent and rough. Only a hard texture can be obtained, and the leveling property is lowered, which is not preferable.
Further, when W _B / D _A > ¼, that is, when there is a fin portion whose maximum width is larger than ¼ of the diameter of the core portion, a soft texture is obtained when a mixed fiber is used. This is not preferable.
As the maximum width of the fin portion is smaller, the soft feeling is increased. However, if the fin portion is too small, problems such as bending of the fin portion and deterioration of the leveling property occur. Therefore, W _B / D _A It is preferable to keep the minimum value to about 1/8.
On the other hand, as the heat-shrinkable polyester multifilament yarn B, a polyester multifilament drawn yarn having a boiling water shrinkage of 8.0% or more is preferably used, and more preferably a polyester multifilament drawn having a boiling water shrinkage of 10 to 16%. Yarn is used. Examples of such heat-shrinkable polyester multifilaments include polyester multifilament drawn yarn that has not been heat-set, and multifilament drawn yarn made of polyester obtained by copolymerizing, for example, about 5 to 15 mol% of isophthalic acid as the third component. can do.
In the polyester mixed yarn of the present invention, the spontaneously stretchable polyester multifilament yarn A is positioned relatively outside the mixed yarn, and the heat-shrinkable polyester multifilament yarn B is relatively positioned inside the mixed yarn. In order to improve the texture of the mixed yarn, the single fiber fineness of the polyester multifilament yarn A is 2-9 dtex, the single fiber fineness of the heat-shrinkable polyester multifilament yarn B is 3-11 dtex, and It is preferable to make the former smaller than the latter. The blend ratio of the spontaneously stretchable polyester multifilament yarn A and the heat-shrinkable polyester multifilament yarn B is 8: 2 to 5: 5 in terms of weight ratio (A: B) from the viewpoint of deep color and swelling. It is preferable to be within the range.
The blended yarn of the present invention described above can be stably produced with good quality with less yarn breakage, for example, by the following method. That is, for example, using the apparatus shown in FIG. 2, the polyester multifilament yarn A ′ that exhibits spontaneous elongation by performing relaxation heat treatment and the heat-shrinkable polyester multifilament yarn B ′ are aligned, and the supply roll 1 and the first roll One interlace nozzle 3 provided between the take-up roll (heating roll) 2 is entangled under overfeed.
In FIG. 2, since the first take-up roll 2 is heated and the polyester multifilament yarns A ′ and B ′ are overfeeded between the supply roll 1 and the first take-up roll 2, the first take-up roll 2 The polyester multifilament A ′ wound around the roll 2 is subjected to relaxation heat treatment on this roll, and spontaneous elongation is imparted. Next, the non-contact heater 5 provided between the first take-up roll 2 and the second take-up roll 4 is subjected to a second relaxation heat treatment, heat-fixed, and wound around the package 6.
Here, when the polyester multifilament yarn A ′ and the heat-shrinkable polyester multifilament yarn B ′ are entangled, it is preferable to provide entanglement with an entangling number of 50 to 90 pieces / m. It is usually preferable to set the content to 1.0 to 1.5%.
In addition, it is preferable to heat the first take-up roll 2 and perform a relaxation heat treatment for imparting spontaneous elongation on the first take-up roll 2 as in the above example, because the apparatus becomes compact, but it is entangled in the interlace nozzle 3. When the overfeed rate (relaxation rate) required for imparting spontaneous elongation by relaxation heat treatment is larger than the overfeed rate suitable for the above, the take-up roll further downstream of the first take-up roll 2 And a predetermined relaxation heat treatment may be performed with the take-up roll. Further, when the first take-up roll 2 is a heating roll, the diameter on the yarn exit side is made smaller than the diameter on the yarn entry side of the roll 2 and a predetermined overfeed rate (relaxation rate) on the roll. You may make it heat-process with.
The temperature and overfeed rate (relaxation rate) in the relaxation heat treatment for imparting spontaneous elongation to the polyester multifilament yarn A ′ vary depending on what type of yarn is used for the polyester multifilament yarn A ′. In the case where the intermediate oriented yarn (POY) spun at a spinning speed of 2000 to 3500 m / min, preferably 2500 to 3500 m / min, is used for relaxation heat treatment on the first take-up roll (heated roll) 2, the roll surface temperature is set to 100. It is preferable to set the overfeed rate (relaxation rate) to 1.0 to 1.5%.
The second relaxation heat treatment by the non-contact heater 5 is a heat setting treatment for imparting the polyester blended yarn with characteristics suitable for forming a highly repellent wool-like touched knitted fabric, and 210 ° C to 240 ° C. It is preferable to carry out the treatment at 1.5 ° C. and an overfeed rate of 1.5 to 2.5%, and the treatment time is usually from 0.01 to 0.30 seconds. The boiling water shrinkage of the obtained polyester mixed yarn is usually about 5 to 13%. As the non-contact heater 5, a slit heater, a pipe heater or the like can be used.
In the above method, the polyester multifilament yarn A ′ that becomes spontaneously stretchable by relaxation heat treatment and the heat-shrinkable polyester multifilament yarn B ′ are entangled and then subjected to relaxation heat treatment to cause the multifilament yarn A ′ to spontaneously stretch. As a result, the yarn does not come into contact with the non-contact heater 5 during the second relaxation heat treatment. It is possible to reduce the production amount stably. The polyester multifilament yarn A ′ is subjected to relaxation heat treatment alone to form a spontaneously stretchable polyester multifilament yarn, heat-set by the second relaxation heat treatment, and then entangled with the heat-shrinkable polyester multifilament yarn B to obtain a polyester mixed yarn. In the manufacturing method, when the second relaxation heat treatment is performed by the non-contact heater, the yarn comes into contact with the non-contact heater, the dyeing spots are generated, and the yarn breakage increases, which is not preferable.

Hereinafter, an example is given and the composition and effect of the present invention are explained in detail.
[Example 1]
Polyethylene terephthalate having an intrinsic viscosity of 0.62 is melted by a conventional method, and spun at a spinning speed of 3,000 m / min, and a polyester intermediately oriented yarn (POY) having 84 dtex / 24 filaments (single fiber fineness: 3.3 dtex). (Polyester multifilament yarn A ′) was obtained. Incidentally, _S B _{/ S A} of the polyester _{multifilament, L B / D A, W} B / D A were as shown in Table 1.
On the other hand, an undrawn yarn obtained by melting polyethylene terephthalate isophthalate copolymer polyester having an intrinsic viscosity of 0.64 (copolymerization of 10.0 mol% of isophthalic acid) at 280 ° C. and spinning at a spinning speed of 1450 m / min. The film was drawn 2.9 times at 0 ° C. to obtain a heat-shrinkable polyester yarn (heat-shrinkable polyester multifilament yarn B ′) having a boiling water shrinkage of 15% and a 56 dtex / 12 filament (single fiber fineness: 4.7 dtex). .
Using this polyester multifilament yarn A ′ and heat-shrinkable polyester multifilament yarn B ′, a polyester mixed yarn was produced using the apparatus shown in FIG. That is, both polyester multifilament yarns A ′ and B ′ are aligned, and the interlace nozzle 3 provided between the supply roll 1 and the first take-up roll 2 (heating roll having a surface temperature of 120 ° C.) 2 is 600 m / min. Was supplied at an overfeed rate of 1.2%, and entangled with 196 kPa (2.0 kg / cm ² ) compressed air to give 65 / m interlace.
Next, with the overfeed rate of 1.2%, the yarn is wound eight times on the heating roll 2 having a surface temperature of 120 ° C. and subjected to a relaxation heat treatment to impart spontaneous elongation to the polyester multifilament yarn A ′. did. Thereafter, a second relaxing heat treatment is performed by a slit heater 5 provided between the heating roll 2 and the second take-up roll 4 at 230 ° C. with an overfeed rate of 2.0% for 0.05 seconds. After fixing, it was wound around the second take-up roll (cold roll) 4 twice and then wound around the package 6. During the production of the polyester blended yarn, the contact of the yarn with the slit heater 5 was not recognized, and the yarn breakage was only once per spindle per day. The obtained blended yarn was woven into a plain woven fabric having a warp of 60 / cm and a weft of 35 / cm, and was dyed black by dyeing at 135 ° C. for 60 minutes by a conventional method. The dyed fabric thus obtained was a fabric with a feeling of swelling that had both a dry touch and a high repellent property, which were not found in the past, and no stained spots were observed.
In addition, about the feel of the textile, the dry touch, the soft feeling, and the high rebound were comprehensively subjected to sensory determination in four stages of A (very good) to D (poor).
[Examples 2 and 3]
A polyester mixed yarn was obtained in the same manner as in Example 1 except that the polyester multifilament A ′ was changed as shown in Table 1 in Example 1. As shown in Table 1, the fabric texture, leveling property, and stretchability were all good results.
[Example 4]
In Example 1, after the polyester multifilament yarn A ′ was subjected to relaxation heat treatment on a heating roll having a surface temperature of 120 ° C. at an overfeed rate of 1.2% by itself to give spontaneous elongation, Using a slit heater, the second relaxation heat treatment was performed for 0.05 seconds at an overfeed rate of 2.0% to perform heat setting. Next, the spontaneously stretchable polyester multifilament yarn A obtained was aligned with the heat-shrinkable polyester multifilament yarn B ′, and entangled with an interlace nozzle under the same conditions as in Example 1. In this case, in the second relaxation heat treatment of the polyester multifilament yarn A ′, the yarn frequently shook and contacted the slit heater, and the yarn breakage reached 20 times per spindle per day. When the obtained mixed fiber was woven and dyed under the same conditions as in Example 1, a fabric with good texture was obtained, but the occurrence of dyed spots was observed.
Comparative Example 1
In Example 1, a polyester mixed filament yarn was obtained in the same manner as in Example 1 except that the polyester multifilament A ′ had a round cross section. As shown in Table 1, the leveling property and stretchability were good results, but the fabric texture did not feel dry at all, and the desired fabric texture was not obtained.

  The polyester blended yarn of the present invention is suitable for obtaining a fabric having both dry touch, dry touch and high repellent properties, which is not conventional, and is excellent in leveling, which is less likely to cause yarn breakage. Therefore, it can be widely used for various knitting and knitting applications.

Claims (6)

In a polyester mixed yarn composed of a spontaneously stretchable polyester multifilament yarn A and a heat-shrinkable polyester multifilament yarn B, the polyester multifilament yarn A extends along the length direction of the core portion and the core portion. And a plurality of fin portions projecting radially from the core portion, and simultaneously satisfy the requirements of the following formulas (a) to (c).
(A) 1/20 ≦ S _B / S _A ≦ 1/3
(A) 0.6 ≦ L _B / D _A ≦ 3.0
(C) W _B / D _A ≦ 1/4
(S _A is the cross section of the core portion, D _A when the cross section of the core portion is not a diameter also true circle when the perfect circle represents the circumscribed circle diameter, also S _B, respectively L _B and W _B fin portion Represents the cross-sectional area, maximum length and maximum width of The polyester multifilament yarn A ′, which becomes the spontaneously stretchable polyester multifilament yarn A by performing the relaxation heat treatment, is aligned with the heat-shrinkable polyester multifilament yarn B ′, and is supplied to the interlace nozzle under overfeeding and entangled. The polyester multifilament yarn according to claim 1, wherein the polyester multifilament yarn A 'is subjected to relaxation heat treatment to impart spontaneous elongation to the polyester multifilament yarn A', and further subjected to second relaxation heat treatment with a non-contact heater. Production method. The method for producing a polyester mixed yarn according to claim 2, wherein a relaxation heat treatment for imparting spontaneous elongation is performed on a heating roller at 100 to 130 ° C. The method for producing a polyester mixed yarn according to claim 2, wherein the polyester multifilament yarn A 'and the polyester multifilament yarn B' are aligned and supplied to the interlace nozzle at an overfeed rate of 1.0 to 1.5%. The method for producing a polyester mixed yarn according to claim 4, wherein an interlace of 50 to 90 pieces / m is provided in the interlace nozzle. The method for producing a polyester mixed yarn according to claim 2, wherein the second relaxation heat treatment is performed at 210 to 240 ° C at an overfeed rate of 1.5 to 2.5%.

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