CN114108114A - Preparation method of split type superfine flat yarn - Google Patents
Preparation method of split type superfine flat yarn Download PDFInfo
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- CN114108114A CN114108114A CN202111208278.4A CN202111208278A CN114108114A CN 114108114 A CN114108114 A CN 114108114A CN 202111208278 A CN202111208278 A CN 202111208278A CN 114108114 A CN114108114 A CN 114108114A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000000835 fiber Substances 0.000 claims abstract description 56
- 229920002292 Nylon 6 Polymers 0.000 claims abstract description 37
- 239000002131 composite material Substances 0.000 claims abstract description 22
- 229920000642 polymer Polymers 0.000 claims abstract description 20
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000001125 extrusion Methods 0.000 claims description 18
- 238000004804 winding Methods 0.000 claims description 16
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 15
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 9
- 238000009998 heat setting Methods 0.000 claims description 9
- 229920000728 polyester Polymers 0.000 claims description 6
- -1 polyethylene terephthalate Polymers 0.000 claims description 6
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 5
- 239000004952 Polyamide Substances 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 239000004480 active ingredient Substances 0.000 claims 1
- 239000000155 melt Substances 0.000 claims 1
- 229920006149 polyester-amide block copolymer Polymers 0.000 abstract description 23
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000004040 coloring Methods 0.000 abstract description 4
- 238000004043 dyeing Methods 0.000 abstract description 4
- 239000011550 stock solution Substances 0.000 abstract description 4
- 239000004744 fabric Substances 0.000 description 5
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- QPFMBZIOSGYJDE-UHFFFAOYSA-N 1,1,2,2-tetrachloroethane Chemical compound ClC(Cl)C(Cl)Cl QPFMBZIOSGYJDE-UHFFFAOYSA-N 0.000 description 2
- 235000008708 Morus alba Nutrition 0.000 description 1
- 240000000249 Morus alba Species 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- 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
- D01D5/42—Formation of filaments, threads, or the like by cutting films into narrow ribbons or filaments or by fibrillation of films or filaments
- D01D5/426—Formation of filaments, threads, or the like by cutting films into narrow ribbons or filaments or by fibrillation of films or filaments by cutting films
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/12—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyamide as constituent
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
Abstract
The invention discloses a preparation method of a split type superfine flat wire, which comprises the following steps: 1) preparing pre-oriented flat tows to prepare the pre-oriented flat tows; 2) the preparation of the flat elastic yarn can prepare the flat composite elastic yarn with the specification of 56-165 dtex/24-72 f, wherein the linear density of the monofilaments after fiber opening is less than or equal to 0.5dtex, and the aspect ratio of the fiber cross section is greater than or equal to 6. The product obtained by the invention has stable quality; secondly, because polyester and polyamide 6 are two incompatible polymers, the flat yarn prepared from the polyester and polyamide 6 can be split into flat yarns with low monofilament linear density and high section length-width ratio after fiber splitting, and the fiber linear density is higher and the section length-width ratio is smaller before fiber splitting, so that the processability is improved; and thirdly, the stock solution coloring fiber can be produced by adding the black master batch, so that the dyeing process is reduced, and the production method is environment-friendly and energy-saving.
Description
Technical Field
The invention relates to a split type superfine flat yarn and a preparation method thereof, belonging to the field of novel chemical fibers. More specifically, two incompatible fiber-grade polymers are used as raw materials, and are subjected to multilayer co-extrusion film forming, longitudinal pre-drafting, strand cutting and stranding to obtain flat tows, and then the flat tows are subjected to texturing on a texturing machine to obtain the superfine flat composite yarn.
Background
The flat silk has a certain length-width ratio on the cross section, so that the fabric woven by the fibers has excellent gloss and smoothness, is widely applied to artificial fur, cover blankets, foot blankets, wool-like fabrics, mulberry silk-like fabrics and the like, and has higher and higher market demand. The production method of the flat filament is basically the same as the production process of the conventional chemical fiber at present and is mainly realized by designing the special spinneret orifice shape, size and arrangement mode. However, the flat cross section of the fiber has large production difficulty for a product with the monofilament linear density less than or equal to 0.5dtex, particularly poor spinning spinnability and large product quality fluctuation, and the application of the fiber in high-end textiles is restricted.
Disclosure of Invention
The invention provides a split-type superfine flat yarn and a preparation method thereof, aiming at the defects of the prior art, the method comprises the steps of taking two incompatible fiber-grade polymers as raw materials, adopting a multilayer co-extrusion method, firstly extruding the polymers into a film, longitudinally pre-drafting and heat-setting, slitting, then carrying out stranding and winding on the polymers to obtain a pre-oriented flat yarn bundle, and then carrying out texturing on a texturing machine to obtain the flat composite yarn. The fabric woven by the method can obtain superfine flat yarns with the cross section aspect ratio of not less than 6 and the monofilament linear density of not less than 0.5dtex after subsequent alkali reduction and fiber opening. The flat yarn has high section profile degree and low monofilament linear density, and the prepared fabric has excellent luster, soft and smooth hand feeling.
The technical scheme of the invention is as follows:
a preparation method of a split type superfine flat wire comprises the following steps: 1) preparation of pre-oriented flat tows: fiber-grade polyester and fiber-grade polyamide 6 are used as raw materials, and a double-component five-layer or seven-layer co-extrusion mode is adopted, wherein the polyester part is an odd layer serving as a component A, and the polyamide part is an even layer serving as a component B; controlling the temperature of each zone of A, B two-component screw extruder to be 250-290 ℃, the temperature of a die head to be 275-290 ℃, obtaining a composite film formed by alternately arranging two polymers, obtaining a drawn film with the thickness of 15-30 mu m by 4-6 times of longitudinal pre-drawing and 140-160 ℃ heat setting, cutting the drawn film into strands with a certain width by a slitting machine, simultaneously plying the strands according to the designed product specification, and winding 24-72 strands at the speed of 50-150 m/min to form to obtain the pre-oriented flat filament bundle with the required linear density;
2) preparing flat stretch yarn: setting the temperature of a first hot box to be 150-170 ℃, the temperature of a second hot box to be 160-180 ℃, the ratio of elasticizing D/Y (the ratio of the speed of a friction disc to the processing speed) to be 1.9-2.1, the drafting multiple to be 1.50-1.70 and the processing speed to be 600m/min on conventional elasticizing equipment; the prepared flat composite stretch yarn with the specification of 56-165 dtex/24-72 f has the filament linear density less than or equal to 0.5dtex after fiber opening and the aspect ratio of the fiber section greater than or equal to 6.
The raw materials are added with black master batch in the process of slice melt extrusion.
The fiber grade polyester adopts one of polyethylene terephthalate (PET) (Turkish group) with the intrinsic viscosity of 0.685 +/-0.01 dL/g, polytrimethylene terephthalate (PTT) (U.S. DuPont) with the intrinsic viscosity of 0.95 +/-0.012 dL/g and polybutylene terephthalate (PBT) (Yizhenghuan chemical fiber) with the intrinsic viscosity of 1.00 +/-0.015 dL/g; the relative viscosity of the fiber grade polyamide 6(PA6) is 2.4 +/-0.03. (Jiangsu Haiyang science and technology)
The black master batch contains 25% of carbon black effective component. (Zhejiang Henghao material)
The invention has the beneficial effects that: the invention adopts a polyester and polyamide 6 multilayer coextrusion method, and the quality of the obtained product is stable through film forming, longitudinal drafting, slitting, stranding and winding and elastic processing; secondly, because polyester and polyamide 6 are two incompatible polymers, the flat yarn prepared from the polyester and polyamide 6 can be split into flat yarns with low monofilament linear density and high section length-width ratio after fiber splitting, and the fiber linear density is higher and the section length-width ratio is smaller before fiber splitting, so that the processability is improved; and thirdly, the stock solution coloring fiber can be produced by adding the black master batch, so that the dyeing process is reduced, and the production method is environment-friendly and energy-saving.
Detailed Description
The invention is further described below by means of specific examples, in which:
intrinsic viscosity: according to GB/T14190-2015, mixing phenol and tetrachloroethane 1: 1 as solvent.
Relative viscosity: the test was carried out according to the FZ/T51004-2011 standard.
Breaking strength and breaking elongation of fiber: tested according to the testing method of GBT-14344-2008 chemical fiber filament tensile property.
Crimp properties of the fiber: the test was performed as FZ/T50007-.
Example 1
The preparation method of the split type superfine flat wire comprises the following steps:
1) preparation of pre-oriented flat tows: PET with the intrinsic viscosity of 0.685dL/g and PA6 with the relative viscosity of 2.40 are used as raw materials, and a two-component five-layer co-extrusion die head is adopted, wherein the PET part is an odd layer and is used as an A component, and the PA part is an even layer and is used as a B component; controlling the temperature of each zone of the A-component screw extruder to be 260-285 ℃, the temperature of each zone of the B-component screw extruder to be 250-270 ℃, and the temperature of the die head to be 285 ℃, obtaining a composite film formed by alternately arranging two polymers, obtaining a drawn film with the thickness of 15.2 mu m by longitudinal 6-time pre-drawing and 150-DEG C heat setting, cutting the composite film into strips with certain width by a strip cutter, simultaneously plying 24 strips, and winding and forming at the speed of 150m/min to obtain the pre-oriented flat filament bundle with the required linear density.
2) Preparing flat stretch yarn: setting the temperature of a first hot box at 160 ℃, the temperature of a second hot box at 170 ℃, the D/Y ratio of elasticizing at 2.0, the draft multiple at 1.60 and the processing speed at 600m/min on the pre-oriented flat tows in the step 1) on conventional elasticizing equipment; the flat composite stretch yarn with the specification of 56dtex/24f is prepared, the monofilament linear density after fiber opening is 0.47dtex, and the length-width ratio of the fiber section is 7.1 (see table 1, and table 1 is a summary table of main process parameters and physical property indexes).
In the embodiment, a polyester and polyamide 6 multilayer co-extrusion method is adopted, and the obtained product has stable quality through film forming, longitudinal drafting, slitting, stranding and winding and elastic processing; secondly, because polyester and polyamide 6 are two incompatible polymers, the flat yarn made of the polyester and polyamide 6 can be split into flat yarns with low monofilament linear density and high section length-width ratio after fiber splitting, and the fiber linear density before fiber splitting is higher and the section length-width ratio is smaller, so that the processability is improved.
Example 2
The preparation method of the split type superfine flat wire comprises the following steps:
1) preparation of pre-oriented flat tows: PET with the intrinsic viscosity of 0.685dL/g and PA6 with the relative viscosity of 2.40 are used as raw materials, and a bi-component seven-layer co-extrusion die head is adopted, wherein the odd layer of the PET part is used as an A component, and the even layer of the PA part is used as a B component; controlling the temperature of each zone of the A-component screw extruder to be 260-290 ℃, the temperature of each zone of the B-component screw extruder to be 250-270 ℃, and the temperature of the die head to be 290 ℃, obtaining a composite film formed by alternately arranging two polymers, obtaining a drawn film with the thickness of 17.1 mu m by longitudinal 6-time pre-drawing and 160-DEG C heat setting, cutting into filaments with certain width by a slitting machine, simultaneously plying 36 filaments, and winding and forming at the speed of 100m/min to obtain the pre-oriented flat filament bundle with the required linear density.
2) Preparing flat stretch yarn: setting the temperature of a first hot box to be 170 ℃, the temperature of a second hot box to be 180 ℃, the D/Y ratio of elasticizing to be 2.1, the draft multiple to be 1.50 and the processing speed to be 600m/min on conventional elasticizing equipment; the flat composite stretch yarn was obtained in a gauge of 83dtex/36f, and after opening, the monofilament linear density was 0.33dtex, and the aspect ratio of the fiber cross section was 8.3 (see Table 1).
In the embodiment, a polyester and polyamide 6 multilayer co-extrusion method is adopted, and the obtained product has stable quality through film forming, longitudinal drafting, slitting, stranding and winding and elastic processing; secondly, because polyester and polyamide 6 are two incompatible polymers, the flat yarn made of the polyester and polyamide 6 can be split into flat yarns with low monofilament linear density and high section length-width ratio after fiber splitting, and the fiber linear density before fiber splitting is higher and the section length-width ratio is smaller, so that the processability is improved.
Example 3
The preparation method of the split type superfine flat wire comprises the following steps:
1) preparation of pre-oriented flat tows: PET with the intrinsic viscosity of 0.685dL/g and PA6 with the relative viscosity of 2.40 are used as raw materials, 3 percent of PET-based black master batch and 3 percent of PA 6-based black master batch are respectively added at the inlets of screw extruders of the PET and the PA6, and a bi-component seven-layer co-extrusion die head is adopted, wherein the odd layer of the PET part is used as an A component, and the even layer of the PA part is used as a B component; controlling the temperature of each zone of the A-component screw extruder to be 260-285 ℃, the temperature of each zone of the B-component screw extruder to be 250-270 ℃, and the temperature of the die head to be 285 ℃, obtaining a composite film formed by alternately arranging two polymers, obtaining a drawn film with the thickness of 29.1 mu m by longitudinal 5-time pre-drawing and 150-DEG C heat setting, cutting into filaments with a certain width by a slitting machine, simultaneously plying 36 filaments, and winding and forming at the speed of 50m/min to obtain the pre-oriented flat filament bundle with the required linear density.
2) Preparing flat stretch yarn: setting the temperature of a first hot box to be 160 ℃, the temperature of a second hot box to be 170 ℃, the D/Y ratio of elasticizing to be 2.0, the draft multiple to be 1.70 and the processing speed to be 600m/min on conventional elasticizing equipment; the flat composite stretch yarn with the specification of 110dtex/36f is prepared, the monofilament linear density after fiber opening is 0.44dtex, and the length-width ratio of the fiber section is 7.9 (see table 1).
In the embodiment, a polyester and polyamide 6 multilayer co-extrusion method is adopted, and the obtained product has stable quality through film forming, longitudinal drafting, slitting, stranding and winding and elastic processing; secondly, because polyester and polyamide 6 are two incompatible polymers, the flat yarn prepared from the polyester and polyamide 6 can be split into flat yarns with low monofilament linear density and high section length-width ratio after fiber splitting, and the fiber linear density is higher and the section length-width ratio is smaller before fiber splitting, so that the processability is improved; and thirdly, the stock solution coloring fiber can be produced by adding the black master batch, so that the dyeing process is reduced, and the production method is environment-friendly and energy-saving.
Example 4
The preparation method of the split type superfine flat wire comprises the following steps:
1) preparation of pre-oriented flat tows: PET with the intrinsic viscosity of 0.685dL/g and PA6 with the relative viscosity of 2.40 are used as raw materials, 5 percent of PET-based black master batch and 5 percent of PA 6-based black master batch are respectively added at the inlets of screw extruders of the PET and the PA6, and a bi-component seven-layer co-extrusion die head is adopted, wherein the odd layer of the PET part is used as an A component, and the even layer of the PA part is used as a B component; controlling the temperature of each zone of the A-component screw extruder to be 260-285 ℃, the temperature of each zone of the B-component screw extruder to be 250-270 ℃, and the temperature of the die head to be 285 ℃, obtaining a composite film formed by alternately arranging two polymers, obtaining a drawn film with the thickness of 27.5 mu m by longitudinal 4-time pre-drawing and 150-DEG C heat setting, cutting into filaments with a certain width by a slitting machine, simultaneously plying 48 filaments, and winding and forming at the speed of 50m/min to obtain the pre-oriented flat filament bundle with the required linear density.
2) Preparing flat stretch yarn: setting the temperature of a first hot box to be 160 ℃, the temperature of a second hot box to be 170 ℃, the D/Y ratio of elasticizing to be 2.0, the draft multiple to be 1.70 and the processing speed to be 600m/min on conventional elasticizing equipment; the flat composite stretch yarn was 165dtex/48f in size, and after opening, the monofilament linear density was 0.49dtex, and the aspect ratio of the fiber cross section was 6.5 (see Table 1).
In the embodiment, a polyester and polyamide 6 multilayer co-extrusion method is adopted, and the obtained product has stable quality through film forming, longitudinal drafting, slitting, stranding and winding and elastic processing; secondly, because polyester and polyamide 6 are two incompatible polymers, the flat yarn prepared from the polyester and polyamide 6 can be split into flat yarns with low monofilament linear density and high section length-width ratio after fiber splitting, and the fiber linear density is higher and the section length-width ratio is smaller before fiber splitting, so that the processability is improved; and thirdly, the stock solution coloring fiber can be produced by adding the black master batch, so that the dyeing process is reduced, and the production method is environment-friendly and energy-saving.
Example 5
The preparation method of the split type superfine flat wire comprises the following steps:
1) preparation of pre-oriented flat tows: PTT with the intrinsic viscosity of 0.95dL/g and PA6 with the relative viscosity of 2.40 are taken as raw materials, a double-component seven-layer co-extrusion die head is adopted, wherein the odd layer of the PTT part is taken as an A component, and the even layer of the PA part is taken as a B component; controlling the temperature of each zone of the A-component screw extruder to be 250-275 ℃, the temperature of each zone of the B-component screw extruder to be 50-270 ℃, and the temperature of the die head to be 275 ℃, obtaining a composite film formed by alternately arranging two polymers, obtaining a drawn film with the thickness of 25.3 mu m by longitudinal 4-time pre-drawing and 140-DEG C heat setting, cutting the composite film into filaments with certain width by a slitting machine, simultaneously plying 72 filaments, and winding and forming at the speed of 50m/min to obtain the pre-oriented flat filament bundle with the required linear density.
2) Preparing flat stretch yarn: setting the temperature of a first hot box on conventional texturing equipment to be 150 ℃, the temperature of a second hot box to be 160 ℃, the texturing D/Y ratio to be 1.9, the draft multiple to be 1.70 and the processing speed to be 600 m/min; the flat composite stretch yarn was 165dtex/72f in size, and after opening, the monofilament linear density was 0.33dtex, and the aspect ratio of the fiber cross section was 8.5 (see Table 1).
In the embodiment, a polyester and polyamide 6 multilayer co-extrusion method is adopted, and the obtained product has stable quality through film forming, longitudinal drafting, slitting, stranding and winding and elastic processing; secondly, because polyester and polyamide 6 are two incompatible polymers, the flat yarn made of the polyester and polyamide 6 can be split into flat yarns with low monofilament linear density and high section length-width ratio after fiber splitting, and the fiber linear density before fiber splitting is higher and the section length-width ratio is smaller, so that the processability is improved.
Example 6
The preparation method of the split type superfine flat wire comprises the following steps:
1) preparation of pre-oriented flat tows: taking PBT with intrinsic viscosity of 1.00dL/g and PA6 with relative viscosity of 2.40 as raw materials, and adopting a two-component seven-layer co-extrusion die head, wherein the PBT part is an odd layer as an A component, and the PA part is an even layer as a B component; controlling the temperature of each zone of the A-component screw extruder to be 250-275 ℃, the temperature of each zone of the B-component screw extruder to be 250-270 ℃, and the temperature of the die head to be 280 ℃ to obtain a composite film formed by alternately arranging two polymers, obtaining a drawn film with the thickness of 24.4 mu m by longitudinal 4-time pre-drawing and 140 ℃ heat setting, cutting the composite film into filaments with certain width by a slitting machine, simultaneously plying 48 filaments, and winding and forming at the speed of 50m/min to obtain the pre-oriented flat filament bundle with the required linear density.
2) Preparing flat stretch yarn: setting the temperature of a first hot box to be 160 ℃, the temperature of a second hot box to be 170 ℃, the D/Y ratio of elasticizing to be 2.0, the draft multiple to be 1.70 and the processing speed to be 600m/min on conventional elasticizing equipment; the flat composite stretch yarn with the specification of 110dtex/48f is prepared, the monofilament linear density after fiber opening is 0.33dtex, and the length-width ratio of the fiber section is 8.6 (see table 1).
In the embodiment, a polyester and polyamide 6 multilayer co-extrusion method is adopted, and the obtained product has stable quality through film forming, longitudinal drafting, slitting, stranding and winding and elastic processing; secondly, because polyester and polyamide 6 are two incompatible polymers, the flat yarn made of the polyester and polyamide 6 can be split into flat yarns with low monofilament linear density and high section length-width ratio after fiber splitting, and the fiber linear density before fiber splitting is higher and the section length-width ratio is smaller, so that the processability is improved.
TABLE 1
Claims (4)
1. The preparation method of the split type superfine flat wire is characterized by comprising the following steps: 1) preparation of pre-oriented flat tows: fiber-grade polyester and fiber-grade polyamide 6 are used as raw materials, and a double-component five-layer or seven-layer co-extrusion mode is adopted, wherein the polyester part is an odd layer serving as a component A, and the polyamide part is an even layer serving as a component B; controlling the temperature of each zone of an A, B two-component screw extruder to be 250-290 ℃ and the temperature of a die head to be 275-290 ℃, obtaining a composite film formed by alternately arranging two polymers, obtaining a drawn film with the thickness of 15-30 mu m by 4-6 times of longitudinal pre-drawing and 140-160 ℃ heat setting, cutting into strips with a certain width by a strip dividing machine, and stranding and winding 24-72 strips at the speed of 50-150 m/min to form pre-oriented flat tows;
2) preparing flat stretch yarn: setting the temperature of a first hot box to be 150-170 ℃, the temperature of a second hot box to be 160-180 ℃, the ratio of the speed of an elasticizing friction disc to the processing speed to be 1.9-2.1, the drafting multiple to be 1.50-1.70 and the processing speed to be 600m/min on conventional elasticizing equipment for the pre-oriented flat tows prepared in the step (1); the prepared flat composite stretch yarn with the specification of 56-165 dtex/24-72 f has the filament linear density less than or equal to 0.5dtex after fiber opening and the aspect ratio of the fiber section greater than or equal to 6.
2. The method for preparing the split type ultra-thin flat yarn as claimed in claim 1, wherein the raw material is added with black master batch during the melt extrusion of the chip.
3. The method for preparing the split type superfine flat yarn as claimed in claim 1, wherein the fiber-grade polyester is one of polyethylene terephthalate with an intrinsic viscosity of 0.685 +/-0.01 dL/g, polypropylene terephthalate with an intrinsic viscosity of 0.95 +/-0.012 dL/g, and polybutylene terephthalate with an intrinsic viscosity of 1.00 +/-0.015 dL/g; the relative viscosity of the fiber grade polyamide 6 is 2.4 +/-0.03.
4. The method for preparing the split type ultra-fine flat yarn as claimed in claim 2, wherein the black master batch contains 25% of carbon black as an active ingredient.
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