US20200017995A1 - Hollow polyester long fiber and preparation method therefor - Google Patents

Hollow polyester long fiber and preparation method therefor Download PDF

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US20200017995A1
US20200017995A1 US16/471,099 US201716471099A US2020017995A1 US 20200017995 A1 US20200017995 A1 US 20200017995A1 US 201716471099 A US201716471099 A US 201716471099A US 2020017995 A1 US2020017995 A1 US 2020017995A1
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fiber
hollow
radius
long fiber
curvature
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Chunjian Ni
Takayuki Yoshimiya
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Toray Industries Inc
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Toray Industries Inc
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
    • D01D10/02—Heat treatment
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
    • 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
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • 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
    • D02G3/24—Bulked yarns or threads, e.g. formed from staple fibre components with different relaxation characteristics
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/06—Packings, gaskets, seals

Definitions

  • This disclosure relates to a hollow polyester long fiber of hollow crimped shape and a preparation method thereof, and the hollow long fiber is suitable for making long fiberfill.
  • feathers and down of waterfowls such as goose down, duck down and the like
  • Bird flu that has occurred worldwide has led to a sharp decline in the production of down, which has caused prices to rise.
  • consumers also have doubts about the safety of down. If the natural feathers are not adequately washed, it will cause bad odor. Therefore, it is necessary to remove the odor-causing dirt in advance and maintain the cleanliness of the feathers.
  • there are still problems in washing feather filling products such as feather bedding, feather jackets and the like.
  • Our hollow polyester long fiber has a cross-sectional hollowness ranging from 20.0% to 45.0%, and the hollow polyester long fiber has a three-dimensionally crimped shape in a natural state, and the crimped shape has a radius of curvature ranging from 10.0 mm to 50.0 mm.
  • the hollow polyester long fiber preferably has a monofilament fineness ranging from 4.0 dtex to 15.0 dtex, and more preferably from 5.0 dtex to 10.0 dtex.
  • the hollow polyester long fiber still has a three-dimensionally crimped shape after dry heat treatment at 160° C. for 3 minutes, and has a radius of curvature in a crimped state ranging from 3.5 mm to 10.0 mm.
  • the hollow polyester long fiber has a polymer raw material selected from the group consisting of polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate or a modified polymer thereof.
  • a dried chip is melt-extruded by a screw and then conveyed to a metering pump through a pipe, the polymer accurately measured by the metering pump is conveyed to a spinning pack, a spinneret of the spinning pack is a hollow spinneret with a cooling distance ranging from 10 to 150 mm, and a wind speed of side blowing ranges from 25 to 90 m/min.
  • the cooling distance preferably ranges from 60 to 110 mm; and the wind speed of the side blowing ranges from 30 to 50 m/min.
  • the hollow polyester long fiber is obtained by a melt spinning process, has the advantages of simple production and low cost, and has a three-dimensional crimped structure, and is suitable for processing into a fluffy processed tow which can be used as long fiberfill.
  • FIG. 1 is a view showing a triangular hollow cross-sectional shape of a hollow polyester long fiber.
  • FIG. 2 is a view showing a quadrangular hollow cross-sectional shape of a hollow polyester long fiber.
  • FIG. 3 is a view showing a three-dimensionally crimped shape of a hollow polyester long fiber in a natural state.
  • FIG. 4 is a schematic view showing a measurement of a radius of curvature.
  • the obtained fluffy processed tow also has a three-dimensional structure so that the bulk of the fluffy tow is large, and a fluffy processed tow excellent in fluffiness can be obtained.
  • the Young's modulus of the polyester fiber is relatively high so that the obtained fluffy processed tow has good pressure resistance and recovery.
  • the three-dimensionally crimped shape means that the fiber exhibits an irregular spiral structure in the long direction ( FIG. 3 ) and, at the same time, due to the difference in alignment between a part of the monofilaments, the rotation mode and direction of the monofilaments are different to form a multi-dimensional stereoscopic form.
  • the hollow polyester long fiber is a hollow fiber produced by melt spinning technique.
  • the molten polyester chips are discharged through a profiled hollow spinneret and then coiled after side blow cooling to obtain the hollow polyester long fiber.
  • the hollow fiber is controlled to have a hollowness ranging from 20.0% to 45.0% and a radius of curvature of the three-dimensionally crimped shape ranging from 10.0 mm to 50.0 mm by adjusting the position of the side blowing to change the cooling distance, adjusting the wind speed of the side blowing, and the spinning speed.
  • the fluffy processed filament obtained by using the hollow fiber has a higher fluffiness, and the higher the hollowness is, the more obvious the light weight is.
  • the radius of curvature of the hollow fiber is too small, the cohesion between the filaments of the fiber is high, the fiber is not easy to be split during the processing of the fluffy tow, and the diameter of the ring formed by the fiber is small, which affects the fluffiness of the processed tow.
  • the crimp radius of the fiber is too large, the diameter of the ring formed by the fiber after being processed into a fluffy processed tow is too large, which may weaken or fail to reflect the original three-dimensional effect of the sheath fiber, and also affect the fluffiness of the processed tow.
  • the obtained hollow fiber has a slightly different cross section, and the hollow portion has a circular shape, an approximately triangular shape, an approximately square shape, an approximately pentagon shape and the like.
  • the number of holes in the hollow section is not limited to one hole.
  • the monofilament fineness of the hollow polyester long fibers is preferably in a range from 4.0 dtex to 15.0 dtex.
  • the diameter of the monofilament fiber is too large, it is not easy to be cooled during spinning, and the uniformity of the fiber is lowered, and the obtained fluffy tow has a hard hand feeling. Therefore, it is more preferable that the monofilament fineness of the hollow polyester long fiber is in a range from 5.0 dtex to 10.0 dtex.
  • the raw materials of the hollow polyester long fibers are mainly common polyesters such as polyethylene terephthalate, polytrimethylene terephthalate or polybutylene terephthalate.
  • a modified copolymer of the above polymer such as an antibacterial and anti-mite modified polymer can also be used, and the same effect as the common polyester can be achieved in terms of fluffiness properties.
  • the hollow polyester long fiber is one of the raw materials for making fluffy processed tows for filling.
  • the hollow polyester long fiber can be directly used as long fiberfill by directly combining N fibers into a fluffy processed tow, and can also be used in combination with other raw materials such as a fiber which is slightly lower in melting point to be made into a blended fiber, and then used as long fiberfill.
  • the blended fiber and the hollow polyester long fiber are subjected to core-sheathing and then partially melted to obtain a more excellent fluffy processed tow, which is then used as long fiberfill.
  • the hollow polyester long fiber still has a three-dimensional shape after dry heat treatment at 160° C. for 3 minutes.
  • the crimped shape changes due to the thermal shrinkage of the fiber, and the radius of curvature is preferably in a range from 3.5 mm to 10.0 mm.
  • the hollow polyester long fiber can maintain a fluffy three-dimensionally crimped shape, and is excellent in hand feeling, fluffiness, heat retention and the like.
  • the long-fiber hollow polyester long fiber can be prepared by the following method, but is not limited to the method:
  • the raw material polyester chips are dried to reduce the water content of the polyester chips, improve the spinnability, and control the water content of the chips to be 50 ppm or less.
  • the dried chips are spun by a general melt spinning method.
  • the chips are melted by a screw or a hot plate and then conveyed to a metering pump through a pipe, and the melt polymer is accurately metered by the metering pump and then enters the spinning pack, wherein the spinneret used in the spinning pack is a spinneret dedicated to hollow fiber spinning.
  • the polymer discharged from the spinneret is cooled, oiled and then coiled.
  • the requirement for the cooling distance (the distance from the lower edge of the spinneret to the upper edge of the side-blowing for cooling) in the spinning process is relatively strict, and it is generally controlled within a range from 10 to 150 mm, preferably within a range from 60 to 100 mm.
  • the wind speed of the side blowing According to the fiber type (total fineness and number of filaments), it is generally controlled within a range from 25 to 90 m/min, preferably from 30 to 50 m/min.
  • the cooling distance is less than 10 mm
  • the polymer discharged from the spinneret is rapidly cooled, the asymmetric effect is obvious, the radius of curvature of the obtained fiber is too small, the cohesion between the fiber monofilaments is high, and the fluffing effect is affected, and at the same time the temperature of the spinneret is easily lowered to cause fiber breakage and thus the spinnability is not good.
  • the cooling distance is greater than 150 mm, the polymer discharged from the spinneret has been uniformly cooled to a certain extent. Even if forced cooling is then performed by the side blowing, the asymmetric effect is weakened, and the radius of curvature of the fiber is too large, which also affects the fluffing effect.
  • the arrangement of the spinneret discharge holes is preferably a “houndstooth” arrangement, which is often referred to as a diamond arrangement.
  • the spinning process mainly adopts a one-step spinning process, that is, spinning/stretching is completed simultaneously, that is, commonly known as FDY.
  • FDY spinning/stretching is completed simultaneously
  • it can also be obtained by a two-step process, that is, a pre-oriented fiber is first obtained, which is commonly known as POY, and then subjected to a drawing process by an extension machine, which is commonly known as DT.
  • the hollow polyester long fiber has a three-dimensional crimped structure and, at the same time, the fiber monofilament is relatively thick, and the fluffy processed tow obtained from the hollow long fiber has a high excluded volume, and has high fluffiness while having excellent compression resistance.
  • the test method is as follows:
  • the total fineness test was performed according to the JIS L 1013:2010 standard, and the monofilament fineness was calculated by the total fineness and the number of filaments.
  • the hollow long fiber was cut into thin slices (i.e., fiber cross section) in the cross-sectional direction, which were then photographed under a normal optical microscope to a suitable magnification, and the area S 1 of the hollow portion and the area S 2 of the entire fiber (including the hollow portion) were calculated according to the photograph, then it was calculated as:
  • Radius of curvature in a natural state the yarn was passed through a scaler (for fineness measurement) to crimp the sample for 10 turns (1 m/turn), and then the sample to be tested was placed (suspended) for 8 hours or more in a constant temperature and humidity environment (20° C. ⁇ 65% RH) to stabilize its state ( FIG. 3 ), then the crimped part within 20 cm below the sample was selected to measure the radius, and 20 different places were selected for measurement and averaged, and the obtained data was the radius of curvature.
  • the measuring instrument was a digital microscopy system (VHX-2000C) manufactured by KEYENCE. The magnification was 20 times, and the radius of curvature was measured by the calculation function of the radius of curvature in the software ( FIG. 4 ). That is, the radius of curvature of the fibers was measured by three locations on the crimped fiber.
  • Curvature radius after dry heat treatment the yarn was passed through a scaler (for fineness measurement) to crimp the sample for 10 turns, and then placed in a dryer for heat treatment.
  • the treatment condition was 160° C. ⁇ 3 min, and then the sample was placed in a constant temperature and humidity environment for 4 hours or more, and finally the crimped part within 20 cm of the lower portion was selected to measure the radius, and 20 different places were selected for measurement and averaged, and the obtained data was the radius of curvature.
  • the sample to be tested was placed in an environment of 20° C. ⁇ 65% RH for 8 hours or more so that the sample to be tested was stabilized; (ii) 30 g of sample were weighted, manually shaken to a fluffy state, placed in a measuring barrel and covered with a lid; (iii) the weight plate was moved down to the highest point of contact with the sample, then the weight plate was released to make it fall freely, and it was started to measure time at the time of releasing the weight plate, and after 1 minute for stabilization, the height was read and recorded; (iv) the lid was opened to take out the sample, which was shaken again to the fluffy state, placed in the measuring barrel and covered with the lid, and measured again according to step (iii), and the same method was repeatedly tested for 5 times; (v) the fluffiness was calculated by calculating the average height of the 5 times of tests.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 25 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 300T-20f, a triangular hollow cross section, a hollowness of 20.0%, a monofilament fineness of 15.0 dtex, and a radius of curvature of 50.0 mm before heat treatment, and a radius of curvature of 10.0 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 390 inch 3 /30 gas shown in Table 1.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 40 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 150T-10f, a triangular hollow cross section, a hollowness of 30.0%, a monofilament fineness of 15.0 dtex, and a radius of curvature of 42.0 mm before heat treatment, and a radius of curvature of 8.5 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 600 inch 3 /30 gas shown in Table 1.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 40 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 60T-4f, a triangular hollow cross section, a hollowness of 45.0%, a monofilament fineness of 15.0 dtex, and a radius of curvature of 37.0 mm before heat treatment, and a radius of curvature of 7.0 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 800 inch 3 /30 g as shown in Table 1.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 35 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross section, a hollowness of 30.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of 40.0 mm before heat treatment, and a radius of curvature of 7.8 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 650 inch 3 /30 gas shown in Table 1.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 50 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-20f, a triangular hollow cross section, a hollowness of 30.0%, a monofilament fineness of 5.0 dtex, and a radius of curvature of 35.0 mm before heat treatment, and a radius of curvature of 6.5 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 610 inch 3 /30 g as shown in Table 1.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 75 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 60T-15f, a triangular hollow cross section, a hollowness of 45.0%, a monofilament fineness of 4.0 dtex, and a radius of curvature of 10.0 mm before heat treatment, and a radius of curvature of 3.5 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 480 inch 3 /30 g as shown in Table 1.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 70 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 65T-10f, a triangular hollow cross section, a hollowness of 30.0%, a monofilament fineness of 6.5 dtex, and a radius of curvature of 30.0 mm before heat treatment, and a radius of curvature of 6.0 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 580 inch 3 /30 g as shown in Table 1.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 70 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 50T-10f, a triangular hollow cross section, a hollowness of 30.0%, a monofilament fineness of 5.0 dtex, and a radius of curvature of 20.0 mm before heat treatment, and a radius of curvature of 4.5 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 520 inch 3 /30 g as shown in Table 1.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 25 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 60T-4f, a quadrangular hollow cross section, a hollowness of 45.0%, a monofilament fineness of 15.0 dtex, and a radius of curvature of 42.0 mm before heat treatment, and a radius of curvature of 8.1 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 760 inch 3 /30 gas shown in Table 1.
  • conventional polytrimethylene terephthalate chips i.e., common 3GT
  • the polytrimethylene terephthalate was dried by a pre-crystallization dehumidifying dryer to have a water content of 30 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 35 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross section, a hollowness of 30.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of 38.0 mm before heat treatment, and a radius of curvature of 7.5 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 630 inch 3 /30 gas shown in Table 1.
  • conventional polybutylene terephthalate chips i.e., common PBT
  • the polybutylene terephthalate was dried by a pre-crystallization dehumidifying dryer to have a water content of 33 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 35 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross section, a hollowness of 30.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of 36.0 mm before heat treatment, and a radius of curvature of 7.0 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 600 inch 3 /30 g as shown in Table 2.
  • cationic modified polyethylene terephthalate chips were used, and the cationic modified polyethylene terephthalate was dried by a pre-crystallization dehumidifying dryer to have a water content of 30 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 35 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross section, a hollowness of 33.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of 33.0 mm before heat treatment, and a radius of curvature of 6.4 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 610 inch 3 /30 g as shown in Table 2.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 10 mm.
  • the wind speed of the side blowing was 35 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross section, a hollowness of 40.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of 12.0 mm before heat treatment, and a radius of curvature of 3.6 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 490 inch 3 /30 g as shown in Table 2.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 60 mm.
  • the wind speed of the side blowing was 35 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross section, a hollowness of 37.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of 30.0 mm before heat treatment, and a radius of curvature of 6.1 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 600 inch 3 /30 g as shown in Table 2.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 90 mm.
  • the wind speed of the side blowing was 35 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross section, a hollowness of 32.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of 34.0 mm before heat treatment, and a radius of curvature of 9.5 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 720 inch 3 /30 g as shown in Table 2.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 110 mm.
  • the wind speed of the side blowing was 35 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross section, a hollowness of 30.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of 38.0 mm before heat treatment, and a radius of curvature of 12.5 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 620 inch 3 /30 g as shown in Table 2.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 150 mm.
  • the wind speed of the side blowing was 35 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross section, a hollowness of 25.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of 44.0 mm before heat treatment, and a radius of curvature of 14.5 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 550 inch 3 /30 g as shown in Table 2.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 90 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross section, a hollowness of 35.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of 18.0 mm before heat treatment, and a radius of curvature of 3.9 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 510 inch 3 /30 gas shown in Table 2.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 50 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross section, a hollowness of 28.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of 28.0 mm before heat treatment, and a radius of curvature of 4.5 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 530 inch 3 /30 g as shown in Table 2.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a common round hole spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 25 m/min, and the polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the fiber were as follows: a fiber type of 56T-24f, a solid circular cross section, a monofilament fineness of 2.3 dtex, and no crimping property before and after heat treatment.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 240 inch 3 /30 g as shown in Table 3.
  • the obtained fiber did not have curl, had a small fluffiness, and was not suitable for use as fiberfill instead of feather.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 90 mm.
  • the wind speed of the side blowing was 35 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross section, a hollowness of 10.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of 40.0 mm before heat treatment, and a radius of curvature of 10.0 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 310 inch 3 /30 g as shown in Table 3.
  • the hollowness of the fiber was too small, although it had a radius of curvature, it was not light in weight and had a small fluffiness, and was not suitable for use as fiberfill instead of feather.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 5 mm.
  • the wind speed of the side blowing was 35 m/min, and spinning was performed through the DSD high-speed spinning process. Since the cooling distance was too short, although the spinning could be performed, the phenomenon of broken filaments and floating filaments was serious, and the feasibility of production was low as shown in Table 3.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 110 m/min, and spinning was performed through the DSD high-speed spinning process. Since the wind speed of the side blowing was too fast, although the spinning could be performed, serious fiber vibration led to serious broken filaments and floating filaments, and the feasibility of production was low as shown in Table 3.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 200 mm.
  • the wind speed of the side blowing was 70 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross section, a hollowness of 15.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of 65.0 mm before heat treatment, and a radius of curvature of 23.0 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 350 inch 3 /30 g as shown in Table 3.
  • semi-dull polyester chips T200N manufactured by Toray Fibers (Nantong) Co., Ltd.
  • the polyester chips were dried by a pre-crystallization dehumidifying dryer to have a water content of 39 ppm after drying.
  • the dried chips were melted and extruded by a screw and conveyed to a metering pump through a pipe.
  • the polymer accurately metered by the metering pump was conveyed to the spinning pack.
  • the spinneret of the spinning pack was a hollow special spinneret with a cooling distance of 65 mm.
  • the wind speed of the side blowing was 20 m/min, and the hollow polyester fiber was obtained through the DSD high-speed spinning process.
  • the characteristics of the hollow fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross section, a hollowness of 12.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of 55.0 mm before heat treatment, and a radius of curvature of 20.0 mm after dry heat treatment at 160° C. for 3 minutes.
  • the fiber was selected as the raw material for the sheath fiber and the core fiber and was fed by overfeeding at a ratio of sheath filament feeding speed/core filament feeding speed of 20 times, processed into core-sheath type fluffy filaments, and every 6 filaments were combined into one to obtain a fluffy processed tow, and the fluffiness of the fluffy processed tow was tested to be 350 inch 3 /30 g as shown in Table 3.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Artificial Filaments (AREA)
  • Multicomponent Fibers (AREA)
US16/471,099 2016-12-23 2017-12-22 Hollow polyester long fiber and preparation method therefor Abandoned US20200017995A1 (en)

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CN201611205849.8A CN108239794A (zh) 2016-12-23 2016-12-23 一种聚酯中空长纤维
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