JP2005113325A - Modified cross-section polyester multifilament and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-grade polyester multifilament yarn having stretchability and water-absorbing and quick-drying properties when woven as a fabric. <P>SOLUTION: The modified cross-section polyester multifilament contains ≥90 mol% ethylene terephthalate and is composed of single filaments having W-shaped cross-section and has ≥1.7 dtex single filament fineness and ≥0.1 space ratio. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a polyester irregular cross-section multifilament excellent in stretch performance and water-absorbing quick-drying property when it is made into a fabric, and a woven fabric thereof.

  Conventionally, in the sports field, fabrics that have a water-absorbing and quick-drying performance that can be comfortably worn even when sweated are used. Also, summer men's clothing, women's clothing, and blouses have water-absorbing and quick-drying performance A fabric is used. Not only these functions, but also clothing that has stretch performance at the same time is required.

  As the water-absorbing quick-drying fabric, a multifilament made of corrugated flat cross-section fibers having a flatness of 1.5 to 3 is used as described in Patent Document 1 and Patent Document 2, but the flat yarn is excellent. The water absorption cannot be obtained, and the soft texture cannot be obtained.

Japanese Examined Patent Publication No. 62-45340 JP 62-6983 A

  In order to solve such a problem, for example, Patent Document 3 describes a polyester irregular cross-section multifilament having a flatness of 2 to 4 and a single yarn fineness of 0.5 to 1.5 denier.

Japanese Patent Laid-Open No. 11-222721

  However, with the modified multi-filament, a soft texture can be obtained, but there is a problem that only water resistance can be obtained and there is no stretchability.

  In order to solve this problem, Patent Document 4 proposes the use of a polytrimethylene terephthalate W cross-section multifilament with 95% or more trimethylene terephthalate and an intrinsic viscosity of 0.8 to 1.3.

JP 2001-316944 A

  According to such a method, the stretchability is improved, but the intrinsic viscosity is 0.8 to 1.3 and the productivity is inferior, and the elongation at break is too high, so that dyeing spots are easily generated by processing with a woven fabric, and the processing is difficult. There was also a problem.

  An object of the present invention is to provide a polyester multifilament yarn that eliminates the problems of the prior art and has high quality, stretchability and water-absorbing quick-drying properties when used as a fabric.

  The present invention is a polyester multifilament made of single yarns having a cross-sectional shape of M-shaped, as a result of repeated studies to solve the above problems, and the single yarn fineness is 1.7 or more and the clearance ratio is 0.1 or more. By using the polyester atypical cross-section multifilament as described above, the quality of the fabric can be maintained, and a yarn having stretch properties and water-absorbing quick-drying properties can be obtained easily and efficiently.

  Fabrics such as woven fabrics and knitted fabrics using the modified multi-filament of the present invention have a large gap between the filaments, so that they are excellent in water-absorbing and quick-drying, and can exhibit an excellent texture rich in functionality and fashion rich in stretch. Further, if it is produced by the direct spinning drawing method, it is possible to have a uniform quality at a low cost.

  The present invention is described in detail below. In the polyester used in the multifilament of the present invention, 90 mol% or more has ethylene terephthalate repeating units. In the present invention, polyethylene terephthalate containing 0.5% by weight of titanium oxide is preferred because it does not cause annoying glare.

  The multifilament of the present invention is a polyester multifilament in which the cross-sectional shape of the fiber is M-shaped.

  Moreover, the single yarn fineness of the multifilament used for this invention is 1.7 dtex or more, Preferably it is 2.0-4.0 dtex. If the single yarn fineness is less than 1.7 dtex, the spinning draft at the time of spinning becomes too high, causing yarn unevenness. In addition, the single yarn fineness is preferably 4.0 dtex or less from the viewpoint of maintaining the shape of the multifilament to obtain water absorption and better maintaining the quality of the fabric.

  Further, the clearance ratio of the present invention is 0.1 or more, preferably 0.3 to 0.7, particularly 0.3 to 0.6 from the viewpoint of excellent water absorption, quick drying and excellent spinning productivity. preferable. As shown in FIG. 1, the clearance ratio is a value obtained by dividing the M-shaped cross-sectional gap length of a single yarn by L2 and dividing by the maximum length L1 in the width direction (that is, the single-thread cross-section width-direction gap length L2 / width-direction maximum length L1). ). When the clearance ratio is less than 0.1, it becomes the same as the flat yarn, and there is no water absorption and quick drying. When the value of the gap ratio is too large, it becomes easy to cause yarn unevenness, productivity drop, and yarn breakage due to insufficient cooling during spinning.

  And if it is M type | mold cross-sectional yarn with which the single yarn fineness and the clearance rate in this invention were limited, stretch property and water absorption can be achieved. In addition, the opening ratio θ of the M-shaped cross section is more preferably 90 to 110 °. In this case, the single yarn of the M-shaped cross-section multifilament is in a packing state as shown in FIG. 2, a gap is formed between the single yarns, and water absorption performance by capillary action is obtained. However, when the opening ratio θ exceeds 110 °, each single yarn is likely to be in a brick-stacked state as shown in FIG. 3, and although stretchability is obtained, it is difficult to obtain high water absorption because there are few gaps between single yarns. Therefore, in order to obtain higher water absorption, the aperture ratio θ is preferably set to 110 ° or less.

  Moreover, a suitable method is illustrated when spinning the multifilament yarn of the present invention. In the present invention, the cross-sectional shape of the multifilament needs to be M-shaped, but it is preferable that the M-shaped cross-section has a sharp end at the cross-section. In order to maintain the M shape in this way, it is preferable not only to make the nozzle hole of the spinneret an M-shaped slit but also to provide a protrusion at each apex of the M-shaped slit. As a method for sharpening the tip of such a cross section, it is known that the polymer viscosity is increased or the polymer after discharge is rapidly cooled, but in this case, the problem is that the nozzle surface is cooled and a knot is generated or weak yarn is generated. May occur. Providing projections at the apexes of the M-shaped slit as in the present invention can maintain a uniform balance of the polymer flow rate from the nozzle, so that the shape of the M-shape can be maintained while maintaining the high elongation product of the yarn. Can keep.

  The winding method of the present invention can be performed by the conventional two-stage spinning drawing method (convection method) or the direct spinning drawing method (SPD method), but the one obtained by the direct spinning drawing method (SPD method) To preferred. However, in the SPD method, when the atypical cross-section yarn as in the present invention is spun, generation of fluff due to yarn swinging on the godet roller and yarn breakage are likely to occur, so the excellent productivity that is an advantage of the SPD method is maintained. In order to produce the obtained modified cross-section multifilament, the following measures should be taken. Specific examples will be described below with reference to the drawings.

  FIG. 4 shows an outline of a direct spinning drawing apparatus suitable for producing the modified cross-section multifilament of the present invention. Polyethylene terephthalate containing 0.5% by weight of melted titanium oxide is discharged from the spinneret 1 of FIG. 4, cooled by the cooling device 2, applied with the oil agent by the oil agent applying device 3, and preliminarily passed through the guide 4. Guided to the tension roller 5. The diameter of the pretension roller is not particularly limited, but is preferably smaller than the goded roller 6 in order to prevent the equipment from becoming large. The polyester fiber is wound around the pretension roller 5 by, for example, 1.5 turns and guided to the first goded roller 6. A stretching temperature equal to or higher than the glass transition point is given by the first goded roller 6, stretched between the second goded roller 7, heat set by the second goded roller 7, and the interlace nozzle 8. After performing the air entanglement process, it is wound up by a winder 9.

  In the case of a modified multi-filament suitable for water absorption, quick drying and stretching as in the present invention, when it is wound by a general direct spinning drawing method, the yarn is taken from the yarn tarmi to the second goded roller and broken. May occur. In order to prevent these, a pretension roller is preferably used.

  The pretension roller can be applied to all single yarn finenesses and filament configurations in the production of directly spun drawn yarns composed of irregular shaped multifilaments, but is preferably used when the single yarn fineness exceeds 2 dtex. . When the single yarn fineness is 2 dtex or less, there is no problem even if a pretension roller is used, but there is no difference in fiber physical properties and productivity even if it is used, so it is complicated to refrain from using it as much as possible. It is good to get rid of it.

  Here, the peripheral speed ratio of the first goded roller 6 / the peripheral speed of the pretension roller 5 is preferably set to 1.01 to 1.05. That is, 1.01 or more is preferable from the viewpoint of improving the bobbin shape deterioration phenomenon, and 1.05 or less is preferable from the viewpoint of preventing the occurrence of fineness spots and yarn breakage due to the occurrence of necking by cold drawing.

Next, a tapered roller may be used for the roller shell of the second goded roller 7. The outline of the tapered roller is as shown in FIG. 5, and the diameter gradually increases from the root of the roller shell 11 toward the outside. The taper rate is calculated by the following formula from the roller length L, the root diameter H1, and the maximum diameter H2 shown in FIG.
Taper rate (%) = (H2−H1) / L × 100

  The taper rate is preferably 2 to 4%. Within this range, it is easy to obtain a fiber having a sufficient dry heat shrinkage stress value without the relaxation of the amorphous part being excessively large during heat setting on the second goded roller. In addition, it is easy to prevent the yarn breakage from occurring due to an increase in tension on the second goded roller, and the production can be performed more stably.

  The multifilament yarn obtained by the above configuration is woven and knitted to make a raw machine, and finished to make a woven fabric. Then, the cover factor value after weaving and processing is preferably 1.07 or more and 1.3 or less in order to obtain stretch properties. Here, the cover factor value is a value obtained by dividing the finish cover factor by the production machine cover factor in the cover factor (CF) shown in Equation 1 (cover factor value = finish cover factor / production machine cover factor). Even if the cover factor value is low or high, the stretchability is lowered.

  In addition, the knitted fabric of this invention contains the knitted fabric at least in part in the atypical section multifilament of this invention. The composition ratio of the modified cross-section multifilament with respect to the entire woven or knitted fabric can be set as appropriate, but it is preferably 30% or more if it is used for ordinary outer garments. Particularly, when 100% of such filaments are used, it is more preferable for summer clothing. It becomes.

  Hereinafter, the present invention will be described in more detail by way of examples. The characteristic values in the following examples are measured by the following method.

(1) Intrinsic viscosity The intrinsic viscosity [η] was measured by a conventional method at 20 ° C. in a mixed solvent of phenol / tetrachloroethane = 6/4.

(2) Spinning productivity The case where the complete bobbin rate at the time of spinning was less than 50% was evaluated as x, 50% to 80% was evaluated as Δ, and the case where it was 80% or more was evaluated as ○.

(3) Water absorption Conforms to JIS L-1096 Method B (Pyreck method)
The elevated height (mm) of water due to capillary action for 10 minutes is measured. A water absorption height of 70 mm or more was regarded as acceptable.

(4) Stretchability The weft stretch ratio of the obtained fabric was measured with a load of 500 g using Toyo Sokki Co., Ltd. Those having a stretchability of 5% or more were regarded as acceptable.

(Examples 1-4, Comparative Example 1)
Polyethylene terephthalate containing 0.5% by weight of titanium oxide, polyester having intrinsic viscosity [η] = 0.633, Examples 1 to 4 are comparative examples of M-type spinning holes, each having a protrusion at each vertex. 1 is melted at 299 ° C. from a spinning hole having only an M-shaped slit, discharged from the spinneret 1 shown in FIG. 4, cooled at a wind speed of 0.46 m / sec, applied with an oil agent, and a peripheral speed of 1213 m / min. It was led to a tension roller (PTR) 5 and wound 1.5 times. Further, it was wound 6.5 times around the first goded roller (GR1) 6 at a surface temperature of 99 ° C. and a peripheral speed of 1250 m / min. The ratio of GR1 / PTR was 1.03. Next, the film was stretched between a second goded roller (GR2) 7 and GR1 at a surface temperature of 125 ° C. and a peripheral speed of 3500 m / min, and heat-set at GR2. A taper roller having a taper ratio of 4% was used for GR2. Then, it was the performance and productivity as described in Table 1 with a winding tension of 0.226 cN / dtex in the winding machine 9. In addition, using 56 dtex / 48 f PET multifilament round cross section for the warp, using the yarn of the example and comparative example for the weft, the warp density is 116 / 2.54 cm, the weft density is 79 / 2.54 cm, the weaving width after weaving The woven fabric width of the 138 cm plain weave finished set product was 84 cm.

(Example 5)
Polyethylene terephthalate containing 0.5% by weight of titanium oxide and polyester having intrinsic viscosity [η] = 0.633 were melted at 299 ° C. through the same M-type spinning hole as in Example 1, and the spinning shown in FIG. After discharging from the base 1, it was cooled and applied with an oil agent, guided to a pre-tension roller (PTR) 5 having a peripheral speed of 1310 m / min, and wound 1.5 times. Further, it was wound 6.5 times around the first goded roller (GR1) 6 at a surface temperature of 99 ° C. and a peripheral speed of 1350 m / min. The ratio of GR1 / PTR was 1.03. Next, the film was stretched between a second goded roller (GR2) 7 and GR1 at a surface temperature of 125 ° C. and a peripheral speed of 3300 m / min, and heat-set at GR2. A taper roller having a taper ratio of 4% was used for GR2. Then, it was as winding-up table 1 with winding-up tension | tensile_strength 0.226cN / dtex with the winder 9. FIG. Spinning productivity was good.

(Example 6)
Polyethylene terephthalate containing 0.5% by weight of titanium oxide and polyester having intrinsic viscosity [η] = 0.633 were melted at 299 ° C. through the same M-type spinning hole as in Example 1, and the spinning shown in FIG. After discharging from the base 1, it was cooled and applied with an oil agent, guided to a pre-tension roller (PTR) 5 with a peripheral speed of 1427 m / min, and wound 1.5 times. Further, the film was wound 6.5 times around a first goded roller (GR1) 6 at a surface temperature of 93 ° C. and a peripheral speed of 1470 m / min. The ratio of GR1 / PTR was 1.03. Next, it extended | stretched between the 2nd Godged roller (GR2) 7 and GR1 with the surface temperature of 125 degreeC, and the peripheral speed of 3700 m / min, and heat-set with GR2. A straight roller was used for GR2. Then, it was as winding-up table 1 with winding-up tension | tensile_strength 0.226cN / dtex with the winder 9. FIG. The spinning productivity was poor, and yarn swinging occurred in GR2. Streaks were seen in the fabric.

(Comparative Example 2)
Polyethylene terephthalate and polyester with intrinsic viscosity [η] = 0.630 are melted at −297 ° C. from a −type spinning hole, discharged from the spinneret 1 shown in FIG. It led to the pre-tension roller (PTR) 5 of 1379 m / min, and was wound 1.5 times. Furthermore, it wound around 1st god dead roller (GR1) 6 with the surface temperature of 87 degreeC, and the peripheral speed of 1420 m / min. The ratio of GR1 / PTR was 1.03. Next, the film was stretched between a second godged roller (GR2) 7 and GR1 at a surface temperature of 133 ° C. and a peripheral speed of 3900 m / min, and heat set at GR2. A straight roller was used for GR2. Then, it was as winding-up table 1 with winding-up tension | tensile_strength 0.196cN / dtex with the winder 9. FIG. The spinning productivity was good but there was no water absorption.

(Comparative Example 3)
Polyethylene terephthalate and polyester with intrinsic viscosity [η] = 0.633 are melted at 293 ° C. from a circle-shaped spinning hole, discharged from the spinneret 1 shown in FIG. The film was wound 6.5 times around the first goded roller (GR1) 6 at a peripheral speed of 1440 m / min at 80 ° C. Next, the film was stretched between a second goded roller (GR2) 7 and GR1 at a surface temperature of 137 ° C. and a peripheral speed of 4200 m / min, and heat set at GR2. A straight roller was used for GR2. Then, it was as winding-up table 1 with winding-up tension | tensile_strength 0.177cN / dtex with the winder 9. FIG. The spinning productivity was good but there was no water absorption.

(Comparative Example 4)
Polyethylene terephthalate containing 0.5% by weight of titanium oxide and polyester having intrinsic viscosity [η] = 0.633 were melted at 299 ° C. through the same M-type spinning hole as in Example 1, and the spinning shown in FIG. After discharging from the base 1, it was cooled and applied with an oil agent, guided to a pre-tension roller (PTR) 5 having a peripheral speed of 1408 m / min, and wound 1.5 times. Furthermore, it wound around 1st god dead roller (GR1) 6 with the surface temperature of 99 degreeC, and the peripheral speed of 1450 m / min 6.5 times. The ratio of GR1 / PTR was 1.03. Next, the film was stretched between a second goded roller (GR2) 7 and GR1 at a surface temperature of 125 ° C. and a peripheral speed of 3300 m / min, and heat-set at GR2. A taper roller having a taper ratio of 4% was used for GR2. Then, it was as winding-up table 1 with winding-up tension | tensile_strength 0.226cN / dtex with the winder 9. FIG. Spinning productivity was poor.

(Examples 7 to 10)
Weaving and processing were carried out so that the M-shaped cross-sectional polyester filament obtained in the same manner as in Example 1 was used as the warp, and the cover factor value was the value shown in Table 2. The stretch properties were as shown in Table 2. In Example 7, the cover factor value was low, and in Example 10, the stretchability was inferior due to the high value.

The schematic diagram of the single yarn cross-sectional shape of the atypical cross section multifilament in this invention and the length used for clearance ratio calculation are demonstrated. It is a figure showing the packing state of the M-shaped cross section multifilament. It is a figure showing the packing state of the M-shaped cross section multifilament. It is the schematic of the direct spinning | stretching extending | stretching apparatus used for manufacturing the atypical cross-section multifilament of this invention. It is the figure which looked at the taper roller used for the 2nd god dead roller 7 of FIG. 4 from the side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spinneret 2 Cooling device 3 Oil supply device 4 Guide 5 Pre-tension roller (PTR)
6 First Godled Roller (GR1)
7 Second Godled Roller (GR2)
8 Interlace nozzle 9 Winder L Roller length H1 Roller root diameter H2 Roller maximum diameter

Claims (5)

A polyester multifilament comprising ethylene terephthalate in an amount of 90 mol% or more and having a cross-sectional shape of a single yarn having an M-shape, wherein the single yarn fineness is 1.7 dtex or more and the clearance ratio is 0.1 or more. Polyester cross-section multifilament.
(However, the gap ratio is the gap length L2 in the width direction of the cross section of the single yarn / the maximum length L1 in the width direction.)   A multifilament having a cross-sectional shape of M-shaped according to claim 1, wherein the opening ratio is 90 to 110 °.   A knitted fabric using at least a part of the modified cross-section multifilament according to claim 1.   A method for producing a woven fabric having a cover factor value of 1.07 to 1.3 after weaving and processing the multifilament of claim 1. (However, Cover factor value = Finishing cover factor / Raw machine cover factor.)   2. When producing a polyester containing 90 mol% or more of ethylene terephthalate, the nozzle hole of the spinneret is spun from a spinneret provided with a protrusion at each vertex of the M-shaped slit to produce a modified cross-section multifilament according to claim 1 how to.

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