WO2022078422A1 - Fil de fibre mélangée composite de polyester et son procédé de préparation - Google Patents

Fil de fibre mélangée composite de polyester et son procédé de préparation Download PDF

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Publication number
WO2022078422A1
WO2022078422A1 PCT/CN2021/123716 CN2021123716W WO2022078422A1 WO 2022078422 A1 WO2022078422 A1 WO 2022078422A1 CN 2021123716 W CN2021123716 W CN 2021123716W WO 2022078422 A1 WO2022078422 A1 WO 2022078422A1
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Prior art keywords
polyester
yarn
polyester filament
filament
mixed fiber
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PCT/CN2021/123716
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English (en)
Chinese (zh)
Inventor
饶波
王长沙
黄儒
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东丽纤维研究所（中国）有限公司
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Priority to CN202180068166.5A priority Critical patent/CN116324061A/zh
Publication of WO2022078422A1 publication Critical patent/WO2022078422A1/fr

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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/28—Heating or cooling arrangements for yarns
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
    • D02G3/04—Blended or other yarns or threads containing components made from different materials
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/34—Yarns or threads having slubs, knops, spirals, loops, tufts, or other irregular or decorative effects, i.e. effect yarns
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/36—Cored or coated yarns or threads

Definitions

  • the invention relates to a polyester composite mixed fiber yarn and a preparation method thereof, in particular to a polyester composite mixed fiber yarn with good package unwinding and high bulkiness.
  • Composite blended yarn is generally a brand-new yarn obtained by combining two or more single yarns through a certain processing method. It has both the performance characteristics of the two single yarns , At the same time, it also has its own unique characteristics of composite mixed fiber yarn, and its corresponding products have a wide variety of products with excellent performance, which are deeply recognized by the market and favored by consumers.
  • Chinese patent CN104278386A discloses a false-twist elastic composite yarn with an eccentric structure. Although the method of overfeed rate difference is used to give the composite yarn a certain difference in yarn length and loop structure, the final fluffy feeling on the fabric is still weak because the height of the loop is too low.
  • Japanese Patent Laid-Open No. 2007-197864 discloses a mixed filament yarn containing at least A and B polyester filaments, wherein the polyester filament A is a side-by-side polyester filament formed of different polymers, and the long direction of the polyester filament B is The cross section may be uniform or may have thick and thin portions.
  • the mixed fiber yarn can be used to make a fleece fabric with good stretch elasticity and soft and fluffy hand.
  • the yarn length difference of the mixed fiber yarn can only be limited within 10%, and if it is too large, it will cause problems such as poor unwinding of the yarn package.
  • the purpose of the present invention is to provide a polyester composite blended yarn with good package unwinding and excellent bulkiness.
  • the blended yarn also has good elasticity, and exhibits natural shades of stripes after dyeing. .
  • the polyester composite blended yarn is composed of polyester filament A and polyester filament B, and the polyester filament B forms a loop outside the polyester filament A.
  • the difference in filament length between the polyester filament A and the polyester filament B is 2-30%, preferably 10-30%; the boiling water shrinkage rate of the polyester filament A is higher than that of the polyester filament B
  • the difference in the length of the polyester filament A and the polyester filament B is increased by 15-200% compared with that before the treatment.
  • the boiling water shrinkage rate of the polyester filament B is preferably below 10%; the monofilament fineness is preferably 0.5-1.2 dtex.
  • the entanglement number of the polyester composite mixed fiber yarn is preferably 100 pieces/m or more, and the entanglement strength is preferably 80.0% or more.
  • the ratio H/L of the height H of the loop to the span L of the loop on the polyester filament A is 0.06-0.35.
  • the polyester filament A is preferably a two-component side-by-side polyester filament, more preferably a PET/PET, PBT/PET or PTT/PET side-by-side polyester filament.
  • the polyester filament B preferably has a plurality of thick fiber segments and thin fiber segments alternately arranged in the longitudinal direction, and the ratio of the diameters of the thick fiber segments to the thin fiber segments is 1.13 or more.
  • the invention also discloses a preparation method of the above polyester composite mixed fiber yarn.
  • the polyester pre-oriented yarn B is firstly drawn out through a hot roller, and then is drawn inward by a hot plate, false twisted and then drawn with the polyester.
  • the filament A is compounded by the air network in the interlacer, and finally it is wound to obtain the compound blended yarn.
  • the overfeed rate of the polyester pre-oriented yarn B is 3-32%, the internal drawing temperature on the hot plate is 160-220° C., and the processing speed is 400-700 m/min.
  • the ratio of the loop height H and the span L formed by the polyester filament B is relatively large, so that the mixed yarn has excellent bulkiness; There is a difference in boiling water shrinkage rate, so that after the polyester composite blended yarn is treated with boiling water, the difference in the length of the polyester filaments A and B becomes larger, the loop structure becomes further higher (the ratio of H/L increases), and the fabric's The bulkiness will also be further improved.
  • the interlacing strength of the mixed fiber yarn of the present invention is relatively large, which can ensure that the yarn still has a good package unwinding property under the condition of a high loop structure (high H/L), thereby Ensure that the yarn has good weaving properties.
  • Fig. 1 is a schematic diagram of the composite mixed fiber yarn of the present invention, where H represents the height of the loop, and L represents the span of the loop.
  • the polyester composite mixed fiber yarn of the present invention is composed of two kinds of polyester filaments A and B, and the polyester filament B forms a loop outside the polyester filament A.
  • the size of the ratio H/L of the height H of the loops formed to the span L of the loops on the polyester filament A is influenced by the difference in yarn length between the polyester filament A and the polyester filament B.
  • the difference between the lengths of the polyester filament A and the polyester filament B is small, the resulting loop is short, and the value of H/L is small; the difference between the lengths of the polyester filament A and the polyester filament B is large, If a high wire circle can be formed, the value of H/L is large.
  • the difference in the length of the polyester filament A and the polyester filament B is less than 2%, the two yarns are basically arranged in parallel at this time, and the loops are extremely short, resulting in a higher bulkiness on the fabric. Poor; when the difference in the length of polyester filament A and polyester filament B is greater than 30%, a large number of sheath yarns surround the core yarn and are arched and exposed, the loop structure is too high, and the stability is poor. In addition, too high wire loops will also lead to poor unwinding of the yarn package, resulting in defects on the cloth surface during the subsequent weaving process, and in severe cases, wire breakage.
  • the difference in filament length between polyester filament A and polyester filament B in the polyester composite mixed yarn is 4-28%, more preferably 10-28%, and most preferably 14-24%.
  • the number of interlaces of the composite blended yarn will also affect the height of the loop formed by polyester filament B in the blended yarn and the bulkiness of the composite blended yarn. make an impact.
  • the number of interlaces is too small, the span L value of the loop on the core yarn will increase significantly, and the loop height H will also decrease, resulting in a significant decrease in the H/L value, so the fabric finally shows good fluffy. Sexual effects are poor.
  • the number of entanglements of the composite mixed fiber yarn is preferably 100 pieces/m or more, more preferably 120 pieces/m or more.
  • the interlacing strength of the mixed fiber yarn also has a great influence on the unwinding property of the package.
  • the interlacing strength of the mixed fiber yarn is weak, the loops on the yarn are easily unraveled under the action of tension (such as weaving tension), resulting in poor weaving passability and wire breakage. Therefore, in order to ensure that the yarn can be weaved smoothly even under the condition of higher loops, that is, to ensure the bulkiness of the mixed fiber yarn without affecting the unwinding property of the package, the interlacing strength of the mixed fiber yarn is preferably above 80.0%.
  • the preferred ratio H/L of the loop height H to the span L of the loop on the polyester filament A in the present invention is 0.06 ⁇ 0.35.
  • the ratio H/L of the height H of the loop in the present invention to the span L of the loop on the polyester filament A is more preferably 0.10 to 0.30.
  • the polyester composite mixed fiber yarn of the present invention is more important in that after the polyester composite mixed fiber yarn is treated with boiling water, the polyester filament A and the polyester filament B have The difference in filament length was increased by 15-200% compared with that before treatment. That is, the bulkiness of the polyester composite mixed fiber yarn of the present invention after the hot water treatment is better than that of the polyester composite mixed fiber yarn before the hot water treatment.
  • the boiling water shrinkage rate of the polyester filament A of the present invention is greater than the boiling water shrinkage rate of the polyester filament B, and the difference is 3% or more.
  • Polyester fibers will shrink after boiling water treatment.
  • the greater the boiling water shrinkage rate of polyester fibers the greater the shrinkage after boiling water treatment.
  • the present invention reduces the boiling water shrinkage rate of the polyester filament B by limiting the internal drawing temperature and processing speed of the polyester pre-oriented filament B on the hot plate, so that the difference between the polyester filament A and the polyester filament B is reduced.
  • the difference in shrinkage rate in boiling water increases, and the additional difference in filament length caused by the shrinkage of polyester filament A after boiling water treatment will be larger, so that the difference in filament length on the final fabric will further increase, and the bulkiness of the fabric will also increase.
  • the difference in the boiling water shrinkage rate of the two filaments is more than 3%, and the difference in the length of the final composite filament can be increased by 15-200%. In the present invention, it is preferred that the difference in the boiling water shrinkage of the two filaments is more than 7%.
  • the boiling water shrinkage rate of the polyester filament B is within 10%.
  • the polyester filament B is wrapped around the outside of the polyester drafting yarn A in the form of loops, the size of its monofilament fineness also affects the feel and bulkiness of the final fabric.
  • the monofilament fineness of the polyester filament B is preferably 0.5 to 1.2 dtex.
  • the polyester filament A and the polyester filament B can be ordinary polymer fibers, and special-shaped fibers can also be selected in order to obtain specific functions.
  • the polyester filament A may preferably be a bi-component side-by-side polyester filament, and more specifically, it may preferably be a PET/PET, PBT/PET or PTT/PET side-by-side polyester filament.
  • the polyester filament B may preferably have a polyester filament with a plurality of thick fiber segments and fine fiber segments alternately arranged in the length direction. , and the larger the ratio of the diameters of the thick fiber segment and the thin fiber segment, the better the natural shade stripe effect after dyeing, so the ratio of the diameter of the fiber segment to the fine fiber segment is more preferably 1.13 or more.
  • the invention also discloses a manufacturing method of the above polyester composite mixed fiber yarn, which is specifically as follows: firstly, the polyester pre-oriented yarn B is firstly drawn by a hot roller, and then drawn in a hot plate, false twisted, and then mixed with a polymer The ester drawn yarn A is compounded by the air network in the interlacer, and finally obtained by rolling.
  • the overfeed rate of polyester pre-oriented yarn B is 3-32%
  • the internal drawing temperature on the hot plate is 160-220°C
  • the processing speed is 400-700m/min.
  • the variation range of the overfeed rate of the polyester draft yarn A is small, generally in the range of 1 to 3%, so the difference in the length of the composite blended yarn mainly depends on the polyester pre-orientation Overfeed rate of wire B.
  • the overfeed rate of polyester filament B is greater than 32%, on the one hand, the processing stability decreases, and the yarn breakage rate increases. High, the bulk stability is poor, and the unwinding of the yarn package is also poor, and the passability in the subsequent weaving process is poor. Therefore, in order to obtain the composite mixed fiber yarn with stable performance, the overfeed rate of the sheath polyester pre-oriented yarn B is preferably 5-30%, more preferably 12-30%.
  • the processing speed is less than 400m/min, the entanglement pressure is too small, and the number of entanglements of the composite mixed fiber yarn is too small, resulting in a significant increase in the span L value of the loop on the core wire, and the height H of the loop It also decreases, so the H/L ratio is significantly reduced.
  • the processing speed exceeds 700m/min, the wire breakage rate increases and the processing stability decreases significantly.
  • the processing speed is preferably 400-600 m/min.
  • the air interlacing pressure used in the present invention should not be lower than 0.05MPa, preferably 0.10-0.50MPa, but excessive interlacing pressure will cause It will cause waste of resources, and on the other hand, it may cause the yarn interlacing strength to be too large, which will lead to the problem of dye spots after the cloth is dyed. Therefore, it is more preferably 0.10 to 0.40 MPa.
  • the drawing temperature in the hot plate has a great influence on the boiling water shrinkage rate of polyester filament B and the softness and bulkiness of the fiber. Generally, the higher the temperature of the hot plate, the lower the yield of boiling water, and the softer and more fluffy the fibers are.
  • the temperature of the hot plate is lower than 160°C, the difference in the boiling water shrinkage rate between it and the polyester filament A is too small due to its excessive boiling water shrinkage rate, and the increase in the length difference of the composite filament after boiling water treatment is small.
  • the temperature of the hot plate exceeds 220°C, the yarn hairiness increases and the strength decreases significantly.
  • the drawing temperature in the hot plate is preferably 180-220°C.
  • the outer draft ratio of the polyester pre-oriented yarn B is the elongation at the end point of the natural stretching region on its S-S curve*(10-120%)+1.
  • the outer draft ratio of the polyester pre-oriented yarn B is too small, the diameter difference of the formed thick and thin segments is small, and the dark and light stripes are weak.
  • the external drafting ratio of the polyester pre-oriented yarn B is too large, the yarn is completely stretched again, and the formed thickness segment structure is homogenized, and the feeling of dark and light stripes is also weak. Therefore, in order to obtain a satisfactory natural shading streak feeling, it is preferable that the outer draft ratio of the polyester pre-oriented yarn B is its natural stretching region end stretch on the S-S curve ⁇ (20-100%)+1.
  • the difference in boiling water shrinkage between polyester filament A and polyester filament B is controlled to be more than 3%, so that after the composite blended yarn is treated with boiling water at 98° C. for 30 minutes, the polyester filament A and the polyester filament The difference in yarn length of B becomes larger, and the bulkiness of the composite mixed fiber yarn is further improved.
  • the present invention makes the package unwindability good.
  • test method involved in the present invention is as follows:
  • Fiber length L 2 average of 10 single fiber lengths
  • the ratio of the difference in the length of the polyester filament A and the polyester filament B after the boiling water treatment is increased compared with that before the treatment.
  • polyester filament A and polyester filament B Take a certain length of composite mixed fiber yarn, and separate polyester filament A and polyester filament B by untwisting and untwisting. Then test the boiling water shrinkage of polyester filament A and polyester filament B respectively as follows: mark the separated polyester filament with a certain length (50cm) on the yarn under the condition of applying 0.1g/D tension. ), then put the yarn under the condition of boiling water at 98°C to allow it to shrink freely for 30min, then the yarn was dried naturally at a temperature of 20°C and a relative humidity of 65%, under a tension condition of 0.1g/D. The length L 1 at the yarn mark was measured, and the boiling water shrinkage rate of the yarn was calculated using the following formula, and the experimental result was taken as the average value of three tests.
  • polyester filament A The difference in boiling water shrinkage between polyester filament A and polyester filament B is
  • Boiling water shrinkage difference (%) boiling water shrinkage A-boiling water shrinkage B;
  • the loop height of the yarn was measured using a DT-105 (F/S) hairiness counter.
  • the cross-linking strength was tested in the following manner. First, apply an initial load of 0.1cN/dtex to the yarn, then mark a certain length on the yarn, usually 1m, and then measure the number of interlaces of the yarn within 1m, which is recorded as N1. Then, apply a constant load of 1 cN/dtex to the yarn, keep it for 30 s, then remove it, and then measure the number of entanglements of the yarn again and record it as N2. And calculate the interlacing strength of the yarn according to the following formula, and take the average value of three tests as the experimental result.
  • the yarn was used as a weft yarn for beating-up evaluation on an air-jet loom, wherein the loom speed: 600 rpm, the fabric structure: plain weave, and the warp ⁇ weft density: 136 ⁇ 125 pcs/inc.
  • the loom speed 600 rpm
  • the fabric structure plain weave
  • the warp ⁇ weft density 136 ⁇ 125 pcs/inc.
  • This composite yarn was used as a weft yarn to make a plain weave fabric. After refining, relaxing, intermediate setting, dyeing, and setting, the weft elasticity of the fabric was tested by JIS L 1096 A method standard.
  • the dyed fabrics were given to those experienced in the field (10 people) to evaluate the appearance and hand feel of the fabric. If everyone thought that the cloth surface had rich shades of stripes, it was judged as 0, and if 6 to 9 people thought that the cloth surface had shades of stripes If the feeling is rich, it is judged as ⁇ , and if less than 6 people think that the cloth surface has a rich sense of shades and stripes, it is judged as ⁇ . The hand (bulkiness) of the fabric was also evaluated in this way.
  • the polyester pre-oriented yarn B is firstly drawn through the hot roller, and the external drawing ratio is 42% ⁇ 70%+1 at the end point of the platform area on the S-S curve.
  • the drawing temperature was 200°C, and the processing speed was 500 m/min.
  • the polyester pre-oriented yarn B after false twisting the PBT/PET bi-component side-by-side polyester draft yarn A fed by the post-insertion method is compounded in the interlacer through the air network,
  • the interlacing pressure is 0.30MPa, and then the composite mixed fiber yarn is obtained by oiling the coil.
  • Table 1 The specific properties are shown in Table 1.
  • the overfeed rate of the polyester pre-oriented yarn B was changed, and the others were the same as in Example 1, and the composite mixed fiber yarn was obtained.
  • the specific properties are shown in Table 1.
  • the temperature of the hot plate drawn in the polyester pre-oriented yarn B was changed, and the others were the same as those in Example 4, and the composite mixed fiber yarn was obtained.
  • the specific properties are shown in Table 1.
  • the monofilament fineness of the polyester filament B was changed, and the others were the same as those in Example 4, and the composite mixed fiber yarn was prepared.
  • the specific properties are shown in Table 1.
  • the processing speed of the inner drafting of the polyester pre-oriented yarn B was changed, and the others were the same as in Example 4, and the composite mixed fiber yarn was obtained.
  • the external drafting ratio of polyester pre-oriented yarn B was changed, and the others were the same as in Example 4, and the composite mixed fiber yarn was obtained.
  • the specific properties are shown in Table 2.
  • polyester filament A The side-by-side composition of polyester filament A was changed, and the others were the same as those in Example 8, and the composite mixed fiber yarn was prepared.
  • the specific properties are shown in Table 2.
  • the overfeed rate of the polyester pre-oriented yarn B was changed, and the others were the same as in Example 16, and the composite mixed fiber yarn was obtained.
  • the specific properties are shown in Table 2.
  • the overfeed rate of the polyester pre-oriented yarn B was changed to 2%, and the others were the same as in Example 1, and the composite mixed fiber yarn was obtained.
  • the specific properties are shown in Table 3.
  • the overfeed rate of the polyester pre-oriented yarn B is too small, the yarn length difference of the composite mixed fiber yarn is small, and the resulting fabric has poor hand feeling and fluffy effect.
  • the overfeed rate of the polyester pre-oriented yarn B was changed to 34%, and the others were the same as in Example 1, and the composite mixed fiber yarn was obtained.
  • the specific properties are shown in Table 3.
  • the temperature of the hot plate drawn in the polyester pre-oriented yarn B was changed to 150°C, and the others were the same as those in Example 4, and the composite mixed fiber yarn was prepared.
  • the specific properties are shown in Table 3.
  • the temperature of the hot plate drawn in the polyester pre-oriented yarn B was changed to 230°C, and the others were the same as those in Example 4, and the composite mixed fiber yarn was prepared.
  • the specific properties are shown in Table 3.
  • the processing speed of the polyester pre-oriented yarn B is too low, the number of entanglements of the composite mixed fiber yarn is small, the value of H/L is low, and the bulkiness of the obtained fabric is not good.

Abstract

Est divulgué un fil de fibre mélangée composite de polyester. Le fil de fibre mélangée composite de polyester est composé de filaments de polyester A et B, le filament de polyester B formant des cercles de filament à l'extérieur du filament de polyester A; la différence de longueur entre le filament de polyester A et le filament de polyester B est de 2 à 30 %, et le taux de rétrécissement dans l'eau bouillante du filament de polyester A est supérieur à celui du filament de polyester B de 3 % ou plus; et lorsque le fil de fibre mélangée composite de polyester est traité dans de l'eau bouillante à 98 °C pendant 30 min, la différence de longueur entre le filament de polyester A et le filament de polyester B est augmentée de 15 à 200 % par rapport à la différence de longueur avant le traitement.
PCT/CN2021/123716 2020-10-15 2021-10-14 Fil de fibre mélangée composite de polyester et son procédé de préparation WO2022078422A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202180068166.5A CN116324061A (zh) 2020-10-15 2021-10-14 聚酯复合混纤纱及其制备方法

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CN202011102207.1 2020-10-15
CN202011102207 2020-10-15

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WO2022078422A1 true WO2022078422A1 (fr) 2022-04-21

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1113392A (zh) * 1993-08-06 1995-12-13 可乐丽股份有限公司 聚酯纤维
JP2000144541A (ja) * 1998-11-05 2000-05-26 Toray Ind Inc ポリエステル混繊糸
JP2003278039A (ja) * 2002-03-15 2003-10-02 Toray Ind Inc ポリエステル複合仮撚糸
JP2007197864A (ja) * 2006-01-26 2007-08-09 Toray Textile Inc ポリエステル混繊糸およびその織編物
CN204023070U (zh) * 2014-08-20 2014-12-17 东丽纤维研究所（中国）有限公司 一种棉感复合纱线及由其制得的纺织品
JP2015190074A (ja) * 2014-03-28 2015-11-02 ユニチカトレーディング株式会社 複合仮撚糸及びこの複合仮撚糸を用いた織編物
CN109652887A (zh) * 2018-12-19 2019-04-19 浙江恒澜科技有限公司 一种双色仿毛聚酯纤维的生产方法
CN110029419A (zh) * 2018-01-11 2019-07-19 东丽纤维研究所（中国）有限公司 一种涤纶混纤假捻加工丝、制备方法及其织物

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1113392A (zh) * 1993-08-06 1995-12-13 可乐丽股份有限公司 聚酯纤维
JP2000144541A (ja) * 1998-11-05 2000-05-26 Toray Ind Inc ポリエステル混繊糸
JP2003278039A (ja) * 2002-03-15 2003-10-02 Toray Ind Inc ポリエステル複合仮撚糸
JP2007197864A (ja) * 2006-01-26 2007-08-09 Toray Textile Inc ポリエステル混繊糸およびその織編物
JP2015190074A (ja) * 2014-03-28 2015-11-02 ユニチカトレーディング株式会社 複合仮撚糸及びこの複合仮撚糸を用いた織編物
CN204023070U (zh) * 2014-08-20 2014-12-17 东丽纤维研究所（中国）有限公司 一种棉感复合纱线及由其制得的纺织品
CN110029419A (zh) * 2018-01-11 2019-07-19 东丽纤维研究所（中国）有限公司 一种涤纶混纤假捻加工丝、制备方法及其织物
CN109652887A (zh) * 2018-12-19 2019-04-19 浙江恒澜科技有限公司 一种双色仿毛聚酯纤维的生产方法

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