JP3526990B2 - Polyester-based different shrinkage mixed yarn - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester-based heterogeneous shrinkable mixture which is excellent in texture such as bulkiness and softness and is suitable for producing a high-quality woven or knitted fabric. It is related to a yarn. 2. Description of the Related Art Different shrinkage blended yarns comprising two or more types of polyester multifilament yarns having different heat shrinkage characteristics are well known, for example, from JP-B-61-13009 and JP-B-7-59770. ing. It is possible to make the woven or knitted fabric have bulkiness or swelling by using the different shrinkage characteristics of these mixed yarns to express the difference in yarn length. In contrast, in the state of being restricted by the structure of the woven or knitted fabric, the expression of the difference in shrinkage was small, and it was difficult to obtain a woven or knitted fabric having sufficient bulkiness. [0003] As a remedy for this, in recent years, various shrinkage blended yarns using spontaneously elongated yarns as low shrinkage yarns have been proposed in Japanese Patent Application Laid-Open Nos. 2-191734 and 5-214628. In these mixed yarns, since the low shrinkage yarn is elongated by the heat treatment, a difference in yarn length can be sufficiently exhibited even in a state where the yarn is restricted by the structure of the woven or knitted fabric. [0004] As described above, the hetero-shrink mixed yarn using the spontaneously elongated yarn as the low shrink yarn can impart bulkiness to the woven or knitted fabric with a swelling feeling. Knitted fabrics are required to be further improved in quality. That is, spontaneously stretched yarns are generally produced by using a polyester undrawn yarn or a polyester highly oriented undrawn yarn as a starting material and finally performing a relaxation heat treatment at a high overfeed rate. Since the internal structure of the polyester yarn has fine spots due to the presence of crystal parts and amorphous parts, when the polyester yarn is subjected to a relaxation heat treatment, the spot structure tends to be further emphasized. For this reason, differences in internal structure and unevenness in thickness occur in the length direction of the relaxed heat-treated yarn, and if the mixed yarn using spontaneously elongated yarn is made into a woven or knitted fabric, unnatural texture unevenness or extreme cases may occur. There is a problem that the quality is deteriorated, for example, the occurrence of stained light and shade and streaky stripes. SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and, when knitted or woven, has a bulky feeling with a swelling feeling, and has unnatural feeling spots and stained shade spots. An object of the present invention is to provide a polyester-based heterogeneous shrinkage-combined yarn capable of obtaining a high-quality woven or knitted fabric without generation of streaks. Means for Solving the Problems The present inventors have made intensive studies on the above-mentioned problems, and as a result, have reached the present invention. That is, the present invention relates to an interlaced mixed yarn comprising a low-shrinkage polyester multifilament yarn (yarn A) and a high-shrinkage polyester multifilament yarn (yarn B), wherein the yarn A
The dry heat shrinkage when treated at 180 ° C for 30 minutes is-
2.0% or less, the variation in the dry heat shrinkage in the length direction of the yarn A is 1.0% or less, and the boiling water shrinkage of the yarn B is
0 to 5%, which is larger than the boiling water shrinkage of the yarn A, and
Dry heat shrinkage of yarn B and yarn after treatment at 0 ° C for 30 minutes
The difference from the dry heat shrinkage rate when treating Article A under the same conditions was 12
% Or less, which is a polyester-based hetero-shrinkage mixed fiber yarn. Hereinafter, the present invention will be described in detail. The low-shrinkage polyester multifilament yarn (yarn A), which is a component of the polyester hetero-shrinkage mixed fiber yarn of the present invention, has a dry heat shrinkage of -2.0 at 180 ° C. for 30 minutes. % Or less, and the variation in the dry heat shrinkage in the length direction of the yarn A is 1.0% or less.
The dry heat shrinkage greatly affects the bulkiness of a woven or knitted yarn. If the dry heat shrinkage is greater than -2.0%, the bulkiness and swelling are reduced, and the paper becomes paper-like. It is not preferred. [0010] In addition, the variation of the dry heat shrinkage in the length direction affects the quality of the woven or knitted fabric, and when the variation exceeds 1.0%,
In the case of a woven or knitted fabric, unnatural dyed light and shade spots, striped streaks, sink marks, and the like are likely to occur, and the quality deteriorates. In general, in producing synthetic fibers, it is common sense to select spinning conditions and control production so that variations in the length direction of the yarn, such as unevenness in thickness, are reduced. Highly uniform fibers are produced and sold. However, this is true for undrawn yarns, highly oriented undrawn yarns produced by high-speed spinning, or these drawn yarns, except for those subjected to relaxation heat treatment. When the yarn is subjected to a relaxation heat treatment at a high overfeed ratio, unevenness of the thickness and yarn characteristics are developed in the length direction due to the inherent characteristics of the polymer. However, in order for the polyester yarn to have a spontaneous elongation, that is, a heat shrinkage ratio of a negative value, it is essential that the polyester undrawn yarn or the highly oriented undrawn yarn is subjected to relaxation heat treatment at a high overfeed rate. In the present invention, by suppressing the variation of the dry heat shrinkage in the length direction after the relaxation heat treatment to 1.0% or less, it is possible to obtain a polyester mixed fiber suitable not only for the feeling of swelling but also for the production of a high-quality woven or knitted fabric. I succeeded in getting it. The yarn A may be manufactured by any method as long as the difference between the dry heat shrinkage and the dry heat shrinkage satisfies the above range. For example, the yarn A has a birefringence of 50 ×.
The overfeed rate of the polyester highly oriented unstretched yarn spun at a spinning speed in the range of 10 ^-3 to 70 × 10 ^-3 is 10 to 30%.
Is preferred. However, the variation in dry heat shrinkage in the length direction of the relaxed heat-treated yarn varies depending on the fineness of the highly oriented undrawn yarn, the relaxation heat treatment temperature, and the treatment speed. It is necessary to select an appropriate range of the relaxation heat treatment temperature in advance. For example, the single yarn fineness of the highly oriented undrawn yarn is 0.5 to 1.
If the relaxation heat treatment speed is 5 to 1000 m / min at 5 denier, the temperature of the non-contact heater for relaxation heat treatment is 400 to 600 ° C.
May be set within the range. Next, the yarn B, which is a high shrinkage component of the polyester-based different shrinkage mixed fiber of the present invention, needs to be a heat shrinkable yarn having a boiling water shrinkage ratio larger than the yarn A. The heat-shrinkable yarn referred to in the present invention means a yarn having a boiling water shrinkage of 0% or more and a breaking elongation of 50% or less. %, Preferably 2 to 5%, 1
A yarn having a difference of 12% or less between the dry heat shrinkage when treated at 80 ° C. for 30 minutes and the dry heat shrinkage when the yarn A is treated under the same conditions is preferable. In general, the high shrinkage yarn of the different shrinkage mixed fiber has a boiling water shrinkage of 5% or more, particularly more than 10%. However, when such a different shrinkage mixed fiber is made into a woven or knitted fabric, the highly shrinkable yarn shrinks greatly, so that not only the yarn itself becomes harder but also the structure of the woven or knitted fabric becomes denser. In some cases, the hand becomes hard and lacks a soft feeling. In the present invention, if a yarn having a boiling water shrinkage of 0 to 5% is used as the highly shrinkable yarn B, the hardening of the yarn after shrinkage can be reduced, and the structure of the woven or knitted fabric can be reduced. Since it does not become dense, a soft feeling can be given to the woven or knitted fabric. When the boiling water shrinkage rate of the high shrinkage yarn B is set to 5% or less, the difference in yarn length is small in the conventional different shrinkage mixed yarn using the heat shrinkable yarn as the low shrinkage yarn. However, the bulkiness and swelling of the woven or knitted fabric could not be reduced, but this method could not be adopted. However, in the present invention, the low heat shrinkable yarn A is a yarn having a dry heat shrinkage of -2.0% or less. In addition, sufficient bulkiness can be imparted to the woven or knitted fabric. Further, in the case of a different shrinkage mixed fiber using a spontaneously elongated yarn as the low shrinkage yarn, it is common to make the boiling water shrinkage of the high shrinkage yarn higher than 5%. Even when the boiling water shrinkage of the highly shrinkable yarn is reduced by the action of the yarn, the bulkiness of the woven or knitted fabric is not affected as much as expected, and an excellent soft feeling can be imparted at the same time. In the polyester-based different shrinkage mixed fiber yarn of the present invention, the dry heat shrinkage of yarn B when treated at 180 ° C. for 30 minutes and the dry heat shrinkage when yarn A is treated under the same conditions (Hereinafter abbreviated as dry heat shrinkage difference) is preferably 12% or less. If the difference in dry heat shrinkage exceeds 12%, the yarn A in the woven or knitted fabric is excessively stretched, which tends to cause a drawback, such as a feeling of flapping. The difference in dry heat shrinkage depends on the dry heat shrinkage of the yarn B, but is preferably 5% or more in order to obtain a woven or knitted fabric having excellent bulkiness after dyeing and finishing. The yarn B may be manufactured by any method as long as the boiling water shrinkage ratio satisfies the above range. For example, the yarn B obtained by appropriately adjusting spinning and drawing conditions may be used. Heat-treated yarns, crimped yarns that have been subjected to crimping such as false twisting or indentation crimping, and yarns containing at least a part of a low-shrinkage polymer as a constituent polymer of the filament are preferably used. it can. In addition, thread B
Filaments having various cross-sectional forms, such as a heterogeneous cross section, a hollow cross section, and a composite cross section of different polymers such as a side-by-side type or a core-sheath type, can be suitably used. The polyester-based different shrinkage mixed fiber yarn of the present invention is
This is an interlaced mixed yarn containing the yarn A and the yarn B described above. The method of confounding each yarn is not particularly limited,
Interlacing by interlacing is preferred from the viewpoint of process passability and the like. The processing conditions of the interlace are as follows: the yarns are fed to a commercially available interlace nozzle at an overfeed rate of 0 to 3% in a state where the yarns are aligned, and the fluid pressure is 1.0 to 4.5 k.
General conditions such as performing confounding processing at g / cm ² can be adopted. The number of confounds is preferably from 10 to 100 / m. In addition, entanglement may be provided by air jet processing accompanied by formation of loop fluff on the yarn surface, but in this case, processing is preferably performed under conditions that reduce the loop size. In the case of forming a woven or knitted fabric using the polyester-based different shrinkage mixed fiber yarn of the present invention, the mixed fiber yarn can be used as it is, but it can also be used as a sweet twisted yarn or a medium strong twisted yarn. In the case of fabric, it can be used for both or one of warp and weft. The method for obtaining each characteristic value in the present invention is as follows. (1) Dry heat shrinkage of yarn A (DHS-A) A sample of about 50 cm is taken from yarn A, and the sample length (L ₀ cm) is measured under a load of 1/30 g / d. 180 ℃ without tension
Place in a dry heat oven for 30 minutes. After the dry heat treatment, the sample is naturally cooled, the sample length (L ₁ cm) is measured again under a load of 1/30 g / d, and the dry heat shrinkage (DHS) is calculated by the following equation. DHS-A (%) = [L ₀ −L ₁ ) / L ₀ ] × 100 This operation was performed on 20 samples randomly collected from the yarn A, and the average value of these DHS was calculated as the dryness of the yarn A. The heat shrinkage (DHS-A) is used. (2) Variation in dry heat shrinkage in the length direction of the yarn A (DHS-σA) Invariant from the 20 DHS values used for obtaining the above DHS-A by a conventional statistical method. The variance is calculated, and the standard deviation, which is the square root of the variance, is defined as DHS-σA (%). (3) Dry heat shrinkage of yarn B (DHS-B) When yarn B is non-crimped, dry heat shrinkage is the same as yarn A except that the number of measurements is three. (DHS-B) (%) is determined. When the yarn B is a crimped yarn, the DHS-B is used in the same manner as the non-crimped yarn B except that the sample length before and after the dry heat treatment is measured under a load of 1/10 g / d. (%). (4) Boiling water shrinkage ratio (WHS) of yarn A and yarn B
-A, WHS-B) In the method for measuring the dry heat shrinkage of yarn B, the sample
Boiling water shrinkage rate (WHS-A, WHS-B) in the same manner except that it is put in boiling water instead of in a dry heat oven at 0 ° C.
(%). Next, the present invention will be described in detail with reference to examples. Examples 1 to 3 and Comparative Examples 1 and 2 Highly oriented undrawn yarn 60 of polyethylene terephthalate (PET) having a birefringence of 62 × 10 ^-3 and obtained by ordinary high-speed spinning.
The yarn A obtained by relaxation heat treatment of d / 72f under the conditions shown in Table 1 and the yarn B50d / 12f made of PET are aligned and interlaced by interlacing, and the number of entanglements is 40 to 50 / m. A different shrink mixed fiber was obtained. At this time, the yarn processing speed was 600 m / min. As the yarn B, the yarn B ₁ (breaking elongation: 32%) by the ordinary spin drawing method, the number of false twists by the ordinary false twisting process was 3000.
T / M false twisted yarn B ₂ (28% elongation at break) and stretched yarn B ₃ of composite fiber (25% elongation at break) in which PET having different polymer viscosities were arranged in a side-by-side type were used. Next, the obtained mixed fiber yarn is twisted at 300 T / M to obtain a sweet twisted yarn, and the sweet twisted yarn is woven using the warp and the weft. 102
A plain woven fabric having a density of 2.5 yarns / 2.54 cm and a weft density of 72 yarns / 2.54 cm was obtained. Table 1 shows the characteristic values of the yarn A and the yarn B and the evaluation results of the woven fabric. [Table 1] As is clear from Table 1, the woven fabrics obtained in Examples 1 to 3 are excellent in bulkiness with swelling feeling, and generate unnatural texture spots, stained shades and streaks. It was of high quality without any work. Among them, the woven fabrics obtained in Examples 2 and 3 in which the boiling water shrinkage of the yarn B was 5% or less had a soft feeling and a warm feeling. On the other hand, the woven fabric of Comparative Example 1 in which the dry heat shrinkage of the yarn A is larger than -2.0% lacks bulkiness, and the dry heat shrinkage in the length direction of the yarn A is small. 1.0% variation
The larger woven fabric of Comparative Example 2 was excellent in bulkiness, but had unnatural spots, streaked stripes, and was inferior in quality. Examples 4 to 6 and Comparative Example ³ A P having a birefringence of 62 × 10 ^-3 was obtained by ordinary high-speed spinning.
The yarn A obtained by relaxing and heat-treating the ET highly oriented undrawn yarn 60d / 72f under the conditions shown in Table 2 and the yarn B50d / 12f made of PET are aligned and interlaced by interlacing. ~ 50 yarns / m of mixed yarn were obtained. Yarn processing rate here 600～800M / min, also as yarn B, yarn B ₄ by spinning drawing method of a conventional method (breaking elongation 27%) and B ₅ (35% elongation at break) Using. Further, the obtained mixed fiber yarn is twisted at 300 T / M to obtain a sweet twisted yarn, and the sweet twisted yarn is woven by using the warp and the weft. Book
A plain woven fabric of /2.54 cm and a weft density of 72 yarns / 2.54 cm was obtained. Thread A
Table 2 shows the characteristic values of the yarn B and the evaluation results of the woven fabric. [Table 2] As is evident from Table 2, the woven fabrics obtained in Examples 4 to 6 are excellent in bulkiness with swelling, and unnatural texture spots, stained shades and streaks are generated. It was of high quality without any work. Above all, the woven fabric obtained in Example 4 in which the difference between the dry heat shrinkage of the yarn B and the dry heat shrinkage of the yarn A is 12% or less has no feeling of fluttering, softness, tightness, and tightness. Of high quality. On the other hand, the woven fabric of Comparative Example 3 in which the variation in the dry heat shrinkage of the yarn A was more than 1.0% was excellent in bulkiness, but had an unnatural spot feeling and streaky stripes. And the quality was inferior. The polyester different shrinkage mixed yarn of the present invention uses a spontaneously elongated yarn having a small variation in dry heat shrinkage in the length direction as a low shrinkage yarn, and a high shrinkage yarn. Since heat-shrinkable yarn is used, if weaving, it has a bulky feeling with swelling, and does not generate unnatural texture spots, stained shades and streaks, and has high quality. It is possible to obtain a woven or knitted fabric having a high woven fabric. The yarn B constituting the polyester-based different shrinkage mixed fiber of the present invention has a boiling water shrinkage of 0 to 5%, which is larger than the boiling water shrinkage of the yarn A, and is treated at 180 ° C. for 30 minutes. If a yarn having a difference of 12% or less between the dry heat shrinkage of the yarn B when the yarn B is treated under the same conditions as that of the yarn A is used, in addition to the bulkiness having a swelling feeling, Thus, it is possible to manufacture a woven or knitted fabric having an excellent feeling having a soft feeling and the like.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-307930 (JP, A) JP-A-7-109632 (JP, A) JP-A-7-207540 (JP, A) JP-A-6-207540 116828 (JP, A) JP-A-7-138834 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D02G 1/00-3/48 D01F 6/62 D02J 1/00- 13/00

Claims (1)

(1) An entangled mixed yarn comprising a low-shrinkage polyester multifilament yarn (yarn A) and a high-shrinkage polyester multifilament yarn (yarn B). Article A-1
Dry heat shrinkage after treatment at 80 ° C. for 30 minutes
% Or less, the variation of the dry heat shrinkage in the length direction of the yarn A is 1.0% or less, and the boiling water shrinkage of the yarn B is 0 to 5 %.
% Is greater than the boiling water shrinkage of the yarn A, and
The dry heat shrinkage of yarn B and yarn A when treated for 30 minutes
A polyester-based heterogeneously shrinkable mixed yarn , wherein the difference from the dry heat shrinkage when treated under the same conditions is 12% or less .