A high-strength and fold-resistant polyester composite filament and its preparation process

Abstract

The present invention discloses a high-strength fold-resistant polyester composite filament and its preparation process. The present invention relates to the field of spinning processes and includes a first composite filament and a second composite filament. Both the first composite filament and the second composite filament of the present invention adopt a triangular cross-section, having good bending resistance and wear resistance, avoiding the situation of fiber breakage due to friction between fibers, and at the same time improving the bending performance of the fibers. The provided first core layer and second core layer can improve the overall rigidity of the fibers and enhance the bending performance. The first outer sizing layer can closely adhere the fluff, fuzz, etc. on the outer side of the first polyester cortex during the spinning process to the outer surface of the first polyester cortex, reducing the occurrence of fiber breakage caused by fiber friction. SBS rubber modified particles are provided in both the first core layer and the second core layer, which can improve the tensile resistance and avoid fiber breakage when the fiber is stretched. The provided wear-resistant fibers have high strength, reducing fiber breakage caused by friction, thereby improving the strength of the fibers themselves.

Description

Technical Field

[0001] The present invention relates to the field of spinning processes, and specifically to a high-strength and fold-resistant polyester composite filament and its preparation process. Background Art

[0002] Polyester is an important variety in synthetic fibers and is the trade name of polyester fiber in China. It is a fiber-forming high polymer - polyethylene terephthalate prepared from purified terephthalic acid or dimethyl terephthalate and ethylene glycol through esterification or transesterification and polycondensation reactions, and is made into fibers through spinning and post-treatment. Polyester filaments are relatively elastic.

[0003] However, traditional polyester filaments mostly have a circular cross-section, with relatively average anti-bending effect and poor wear resistance. Fabrics made from them are prone to wrinkles and wear after long-term use. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-strength and fold-resistant polyester composite filament and its preparation process to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A high-strength and fold-resistant polyester composite filament and its preparation process, including a first composite filament and a second composite filament. The first composite filament and the second composite filament are in a covered filament structure, and the cross-sectional structures of both the first composite filament and the second composite filament are triangular special-shaped cross-sections. Fiber fabrics with a triangular cross-section have much higher bending resistance and wear resistance than fiber fabrics with a circular cross-section, etc., avoiding the situation of fiber breakage due to friction between fibers, and at the same time improving the bending resistance of the fibers;

[0006] A first polyester cortex is provided in the first composite filament. The middle side of the first polyester cortex is a hollow structure with a first hollow area, and a first core layer is provided in the first hollow area. Setting the first core layer can improve the overall rigidity of the fiber and improve the bending resistance. At the same time, the provided first hollow area can improve the warmth retention of the fiber;

[0007] A first outer sizing layer is provided on the outer side of the first polyester cortex. The first outer sizing layer can closely fit the fluff, fuzz, etc. on the outer side of the first polyester cortex during the spinning process to the outer surface of the first polyester cortex, thereby reducing the friction force on the outer surface of the fiber and reducing the occurrence of fiber breakage due to fiber friction;

[0008] A second polyester cortex is provided in the second composite filament. The middle side of the second polyester cortex is a hollow structure with a second hollow area, and a second core layer is provided in the second hollow area. The second core layer can improve the rigidity of the fiber and improve the bending resistance. At the same time, the second hollow area can improve the warmth retention of the fiber;

[0009] SBS rubber modified particles are provided in both the first core layer and the second core layer, which can improve the tensile resistance of the first core layer and the second core layer and prevent the fibers from breaking when being stretched.

[0010] A second sizing layer is provided on the outer side of the second polyester skin layer. The second sizing layer can closely attach the fluff, hairiness, etc. on the outer side of the second polyester skin layer during the spinning process to the outer surface of the second polyester skin layer, thereby reducing the frictional force on the outer surface of the fiber and reducing the occurrence of fiber breakage caused by fiber friction.

[0011] Wear-resistant fibers are provided on the outer side surface of the second polyester skin layer. The wear-resistant fibers are metal fiber wires. The wear-resistant fibers have high strength and much higher wear resistance than ordinary fibers. When the second composite filament and the first composite filament are wound to form a covered filament structure, the wear-resistant fibers contact the other fibers, which can prevent direct friction between the fibers and reduce fiber breakage caused by friction, thereby improving the strength of the fibers themselves.

[0012] Preferably, SBS rubber modified particles are provided in both the first core layer and the second core layer, which can improve the tensile resistance of the first core layer and the second core layer and prevent the fibers from breaking when being stretched.

[0013] Preferably, nano-phase change temperature control microcapsules are provided in the first core layer. The nano-phase change temperature control microcapsules can reduce the temperature fluctuation of the fibers and prevent the situation where the fiber strength drops too much when the temperature is high.

[0014] Preferably, water-absorbing resin particles are provided in the second core layer. The water-absorbing resin particles can improve the moisture absorption performance of the second composite filament. When the first composite filament and the second composite filament form a covered filament, the second core layer can keep the humidity of the first composite filament and the second composite filament within a certain range, reduce the generation of static electricity, avoid the situation of fiber entanglement and then friction breakage caused by static electricity, and improve the wearing comfort of the fabric made of this fiber.

[0015] Preferably, the wear-resistant fibers are stainless steel metal wires, which have good flexibility, good mechanical properties and corrosion resistance, and are completely resistant to the corrosion of nitric acid, phosphoric acid, alkalis and organic chemical solvents.

[0016] A preparation process for high-strength and fold-resistant polyester composite filaments includes the following steps:

[0017] S1. Slice screening, drying and mixing treatment: Screen polyester fiber slices, remove dust, debris, etc. from the slices. Heat and dry the screened slices with hot air to remove excess moisture, and then add them to the polymer hopper as component A. Screen polyester fiber slices, remove dust, debris, etc. from the slices. Heat and dry the screened slices with hot air to remove excess moisture, and then add the nano-phase change temperature control microcapsules for mixing to form component B. Heat and dry the screened slices to remove excess moisture, and then add them to the polymer hopper as component C. Heat and dry the screened slices to remove excess moisture, and then add the water-absorbing resin particles for mixing to form component D;

[0018] S2. Heating, melting and extrusion: Spray out component A and component B through a core-sheath structure spinneret assembly. Among them, component B forms the first core layer as the core structure, and component A forms the first polyester cortex as the sheath structure. The shape of the spinneret hole for spraying component A is triangular, and the shape of the spinneret hole for spraying component B is circular. Spray out component C and component D through another core-sheath structure spinneret assembly. Among them, component D forms the second core layer as the core structure, and component C forms the second polyester cortex as the sheath structure. The shape of the spinneret hole for spraying component C is triangular, and the shape of the spinneret hole for spraying component D is circular;

[0019] S3. Cooling: The formed first composite filament and the second composite filament are cooled through their respective channels. Blow cooling air into the channels through the cooling air system to cool the fibers. The first composite filament and the second composite filament are stretched and formed under the drawing action of their respective winding rollers;

[0020] S4. Sizing treatment: Pass the formed first composite filament and the second composite filament through a sizing machine to form the first outer sizing layer on the outer side of the first composite filament and form the second polyester cortex on the outer side of the second composite filament. The first outer sizing layer and the second polyester cortex can closely adhere the hairiness, hair filaments, etc. to the outer surface of the fiber, thereby reducing the friction force on the outer surface of the fiber and reducing the occurrence of fiber breakage due to fiber friction;

[0021] S5. Wear-resistant filament polymerization: Wind the wear-resistant fiber around the outer side of the second composite filament to make the second composite filament have good surface wear resistance;

[0022] S6. Fiber coating: Wrap and wind the two fibers of the first composite filament and the second composite filament to form one fiber. Due to the action of the wear-resistant fiber, the whole fiber has good strength and wear resistance.

[0023] Preferably, in the S1 step of slicing, screening, drying and mixing, the temperature of the heating air is 80°C and the humidity is not more than 35%, which is dry hot air and can quickly remove the moisture in the slices.

[0024] Preferably, in the S3 cooling step, the temperature of the cooling air is between 5 and 15°C and the humidity is not more than 35%, which is dry cold air and can ensure the rapid and efficient cooling of the fibers, improving the fiber quality.

[0025] Preferably, in the S3 cooling step, the wind speed of the cooling air is between 0.8 m / s and 1 m / s. This cooling air wind speed can ensure the rapid cooling inside the fiber on the premise of avoiding the formation of eddy currents in the aisle and affecting the spinning, and avoid the increase in the unevenness of linear density.

[0026] In summary, the beneficial effects of the present invention are as follows:

[0027] Both the first composite filament and the second composite filament of the present invention adopt a triangular cross-section, which has good bending resistance and wear resistance, avoids the situation of fiber breakage due to friction between fibers, and at the same time improves the bending performance of the fibers. The provided first core layer and second core layer can improve the overall rigidity of the fibers and enhance the bending performance. The first outer sizing layer can closely adhere the fluff, fuzz, etc. outside the first polyester cortex during the spinning process to the outer surface of the first polyester cortex, reducing the occurrence of breakage due to fiber friction. SBS rubber modified particles are provided in both the first core layer and the second core layer, which can improve the tensile resistance and avoid fiber breakage when the fiber is stretched. The set wear-resistant fibers have high strength, reducing fiber breakage due to friction, thereby improving the strength of the fiber itself. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is the front view structure schematic diagram of a high-strength and fold-resistant polyester composite filament of the present invention;

[0030] Figure 2 For the present invention Figure 1 It is the cross-sectional structure schematic diagram of the first composite filament in the present invention;

[0031] Figure 3 For the present invention Figure 2 It is the three-dimensional structure schematic diagram of the first composite filament in the present invention;

[0032] Figure 4For the present invention Figure 1 Schematic cross-sectional structure diagram of the second composite filament in the present invention;

[0033] Figure 5 For the present invention Figure 4 Schematic three-dimensional structure diagram of the second composite filament in the present invention.

[0034] The labels in the attached drawings are described separately as follows: 11, the first composite filament; 12, the second composite filament; 13, the first polyester cortex; 14, the first outer sizing layer; 15, the first core layer; 16, the nano-phase change temperature control microcapsule; 17, the first hollow area; 18, the second polyester cortex; 19, the second sizing layer; 20, the second core layer; 21, the water-absorbing resin particles; 22, the second hollow area; 23, the wear-resistant fiber. Detailed implementation manners

[0035] All features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any manner.

[0036] Any feature disclosed in this specification (including any additional claims, abstract, and drawings), unless specifically stated, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically stated, each feature is only an example in a series of equivalent or similar features.

[0037] The following combines Figures 1-5 to describe the present invention in detail. For the convenience of description, the orientations mentioned below are defined as follows: The up-down, left-right, front-back directions mentioned below are the same as the front-back, left-right, up-down directions of the view direction, Figure 1 and the front view of the device of the present invention is Figure 1 shown in the figure, Figure 1 and the directions shown are the same as the front-back, left-right, up-down directions of the front view direction of the device of the present invention.

[0038] Please refer to Figures 1-5 , an embodiment provided by the present invention: A high-strength and fold-resistant polyester composite filament and its preparation process, including a first composite filament 11 and a second composite filament 12. The first composite filament 11 and the second composite filament 12 are in a covered filament structure. The cross-sectional structures of the first composite filament 11 and the second composite filament 12 are both triangular profiled cross-sections. Fibrous fabrics with triangular cross-sections have much higher bending resistance and wear resistance than those with circular cross-sections, avoiding the situation of fiber breakage due to friction between fibers and improving the bending resistance of the fibers at the same time;

[0039] The first composite filament 11 is provided with a first polyester cortex 13. The middle side of the first polyester cortex 13 has a hollow structure with a first hollow area 17. A first core layer 15 is arranged in the first hollow area 17. Setting the first core layer 15 can improve the overall rigidity of the fiber and enhance the bending resistance performance. At the same time, the set first hollow area 17 can improve the warmth retention property of the fiber;

[0040] A first outer sizing layer 14 is arranged on the outer side of the first polyester cortex 13. The first outer sizing layer 14 can closely attach the hairs, filaments, etc. on the outer side of the first polyester cortex 13 during the spinning process to the outer surface of the first polyester cortex 13, thereby reducing the friction force on the outer surface of the fiber and reducing the occurrence of fiber breakage caused by fiber friction;

[0041] The second composite filament 12 is provided with a second polyester cortex 18. The middle side of the second polyester cortex 18 has a hollow structure with a second hollow area 22. A second core layer 20 is arranged in the second hollow area 22. The second core layer 20 can improve the rigidity of the fiber and enhance the bending resistance performance. At the same time, the second hollow area 22 can improve the warmth retention property of the fiber;

[0042] Both the first core layer 15 and the second core layer 20 are provided with SBS rubber modified particles, which can improve the tensile resistance performance of the first core layer 15 and the second core layer 20 and prevent the fiber from breaking when being stretched;

[0043] A second sizing layer 19 is arranged on the outer side of the second polyester cortex 18. The second sizing layer 19 can closely attach the hairs, filaments, etc. on the outer side of the second polyester cortex 18 during the spinning process to the outer surface of the second polyester cortex 18, thereby reducing the friction force on the outer surface of the fiber and reducing the occurrence of fiber breakage caused by fiber friction;

[0044] A wear-resistant fiber 23 is arranged on the outer side surface of the second polyester cortex 18. The wear-resistant fiber 23 is a metal fiber filament. The wear-resistant fiber 23 has a high strength and its wear resistance is much higher than that of ordinary fibers. When the second composite filament 12 and the first composite filament 11 are wound to form a covered yarn structure, the wear-resistant fiber 23 contacts with the other fibers, which can avoid the direct friction between the fibers and reduce the fiber breakage caused by friction, thereby improving the strength of the fiber itself;

[0045] In addition, in one embodiment, both the first core layer 15 and the second core layer 20 are provided with SBS rubber modified particles, which can improve the tensile resistance performance of the first core layer 15 and the second core layer 20 and prevent the fiber from breaking when being stretched.

[0046] In addition, in one embodiment, nano-phase change temperature control microcapsules 16 are provided in the first core layer 15. The nano-phase change temperature control microcapsules 16 can reduce the temperature fluctuation of the fiber and avoid the situation where the fiber strength drops excessively due to high temperature.

[0047] In addition, in one embodiment, water-absorbing resin particles 21 are provided in the second core layer 20. The water-absorbing resin particles 21 can improve the moisture absorption performance of the second composite filament 12. When the first composite filament 11 and the second composite filament 12 form a covered filament, the second core layer 20 can keep the humidity of the first composite filament 11 and the second composite filament 12 within a certain range, reduce the generation of static electricity, avoid the situation of fiber entanglement and then friction fracture caused by static electricity, and improve the wearing comfort of the fabric made of this fiber.

[0048] In addition, in one embodiment, the wear-resistant fiber 23 is a stainless steel wire, which has good flexibility, good mechanical properties and corrosion resistance, and is completely resistant to the corrosion of nitric acid, phosphoric acid, alkali and organic chemical solvents.

[0049] A preparation process of a high-strength and fold-resistant polyester composite filament includes the following steps:

[0050] S1. Slice screening, drying and mixing treatment: Screen polyester fiber slices, remove dust debris, etc. from the slices, heat and dry the screened slices with hot air to remove excess moisture and then add them to the polymer hopper as component A. Screen polyester fiber slices, remove dust debris, etc. from the slices, heat and dry the screened slices with hot air to remove excess moisture and then add the nano-phase change temperature control microcapsules 16 for mixing to form component B. Heat and dry the screened slices to remove excess moisture and then add them to the polymer hopper as component C. Heat and dry the screened slices to remove excess moisture and then add the water-absorbing resin particles 21 for mixing to form component D;

[0051] S2. Heating, melting and extrusion: Spray component A and component B through a core-sheath structure spinneret assembly. Component B forms the first core layer 15 as the core structure, and component A forms the first polyester cortex 13 as the sheath structure. The shape of the spinneret hole for spraying component A is triangular, and the shape of the spinneret hole for spraying component B is circular. Spray component C and component D through another core-sheath structure spinneret assembly. Component D forms the second core layer 20 as the core structure, and component C forms the second polyester cortex 18 as the sheath structure. The shape of the spinneret hole for spraying component C is triangular, and the shape of the spinneret hole for spraying component D is circular;

[0052] S3. Cooling: The formed first composite filament 11 and the second composite filament 12 are cooled through their respective channels. Cooling air is blown into the channels by a cooling air system to cool the fibers. The first composite filament 11 and the second composite filament 12 are stretched and formed under the drawing action of their respective winding rollers.

[0053] S4. Sizing treatment: The formed first composite filament 11 and the second composite filament 12 are passed through a sizing machine. The first outer sizing layer 14 is formed on the outer side of the first composite filament 11, and the second polyester skin layer 18 is formed on the outer side of the second composite filament 12. The first outer sizing layer 14 and the second polyester skin layer 18 can closely adhere fluff, fuzz, etc. to the outer surface of the fibers, thereby reducing the friction on the outer surface of the fibers and reducing the occurrence of breakage caused by fiber friction.

[0054] S5. Wear-resistant fiber polymerization: The wear-resistant fiber 23 is wound around the outer side of the second composite filament 12, so that the second composite filament 12 has good surface wear resistance.

[0055] S6. Fiber coating: The first composite filament 11 and the second composite filament 12 are coated and wound together to form a single fiber. Due to the action of the wear-resistant fiber 23, the whole fiber has good strength and wear resistance.

[0056] In addition, in one embodiment, in the step S1 of slice screening, drying and mixing treatment, the temperature of the heating air is 80 °C, and the humidity is not more than 35%, which is dry hot air and can quickly remove the moisture in the slices.

[0057] In addition, in one embodiment, in the step S3 of cooling, the temperature of the cooling air is between 5 and 15 °C, and the humidity is not more than 35%, which is dry cold air and can ensure the rapid and efficient cooling of the fibers and improve the fiber quality.

[0058] In addition, in one embodiment, in the step S3 of cooling, the wind speed of the cooling air is between 0.8 m / s and 1 m / s. This cooling air wind speed can ensure the rapid cooling inside the fibers on the premise of avoiding the formation of eddy currents in the channels and affecting the spinning, and avoid the increase in the unevenness of linear density.

[0059] In a specific embodiment, when preparing the fibers, first, the slices are screened, dried, and mixed. Polyester fiber slices are screened to remove dust, debris, etc. from the slices. The screened slices are dried by hot air to remove excess moisture and then added to the polymer hopper as component A. Polyester fiber slices are screened to remove dust, debris, etc. from the slices. The screened slices are dried by hot air to remove excess moisture and then nano-phase change temperature control microcapsules 16 are added for mixing to form component B. The screened slices are dried by heating to remove excess moisture and then added to the polymer hopper as component C. The screened slices are dried by heating to remove excess moisture and then water-absorbing resin particles 21 are added for mixing to form component D. Components A and B are ejected through a core-sheath structure spinneret assembly, where component B forms the first core layer 15 as the core structure and component A forms the first polyester skin layer 13 as the skin structure. The shape of the spinneret holes for ejecting component A is triangular, and the shape of the spinneret holes for ejecting component B is circular. Components C and D are ejected through another core-sheath structure spinneret assembly, where component D forms the second core layer 20 as the core structure and component C forms the second polyester skin layer 18 as the skin structure. The shape of the spinneret holes for ejecting component C is triangular, and the shape of the spinneret holes for ejecting component D is circular. The formed first composite filament 11 and second composite filament 12 are cooled through their respective channels. Cooling air is blown into the channels by a cooling air system to cool the fibers. The first composite filament 11 and second composite filament 12 are stretched and formed under the drawing action of their respective winding rollers. The formed first composite filament 11 and second composite filament 12 are passed through a sizing machine to form a first outer sizing layer 14 on the outer side of the first composite filament 11 and a second polyester skin layer 18 on the outer side of the second composite filament 12. The first outer sizing layer 14 and the second polyester skin layer 18 can closely adhere fuzz, hairiness, etc. to the outer surface of the fibers, thereby reducing the friction on the outer surface of the fibers and reducing the occurrence of breakage caused by fiber friction. Wear-resistant fibers 23 are separately wound around the outer side of the second composite filament 12, making the second composite filament 12 have good surface wear resistance. The first composite filament 11 and the second composite filament 12 are wrapped and wound together to form a single fiber. Due to the action of the wear-resistant fibers 23, the fiber as a whole has good strength and wear resistance.

[0060] As described above, it is only the specific implementation manner of the invention, but the protection scope of the invention is not limited thereto. Any change or substitution that can be thought of without creative labor should be covered within the protection scope of the invention. Therefore, the protection scope of the invention should be subject to the protection scope defined by the claims.

Claims

1. A high-strength and fold-resistant polyester composite filament, comprising a first composite filament (11) and a second composite filament (12), characterized in that: The first composite filament (11) and the second composite filament (12) are covered yarn structures, and the cross-sectional structures of the first composite filament (11) and the second composite filament (12) are both triangular profiled cross-sections; The first composite filament (11) is provided with a first polyester cortex (13). The middle side of the first polyester cortex (13) is a hollow structure provided with a first hollow region (17), and a first core layer (15) is provided in the first hollow region (17); A first outer sizing layer (14) is provided on the outer side of the first polyester cortex (13); The second composite filament (12) is provided with a second polyester cortex (18). The middle side of the second polyester cortex (18) is a hollow structure provided with a second hollow region (22), and a second core layer (20) is provided in the second hollow region (22); SBS rubber modified particles are provided in both the first core layer (15) and the second core layer (20); A second sizing layer (19) is provided on the outer side of the second polyester cortex (18); Wear-resistant fibers (23) are provided on the outer side surface of the second polyester cortex (18), and the wear-resistant fibers (23) are metal fiber filaments.

2. The high-strength and fold-resistant polyester composite filament according to claim 1, wherein: Nanophase change temperature control microcapsules (16) are provided in the first core layer (15).

3. A high-strength fold-resistant polyester composite filament according to claim 1, characterized in that: Water-absorbing resin particles (21) are provided in the second core layer (20).

4. The high-strength and fold-resistant polyester composite filament according to claim 1, wherein: The wear-resistant fibers (23) are stainless steel metal wires.

5. A preparation process of a high-strength and fold-resistant polyester composite filament obtained according to any one of claims 1-4, characterized in that, It includes the following steps: S1. Chip screening, drying and mixing treatment. Screen polyester fiber chips, remove dust and debris in the chips, heat and dry the screened chips with hot air to remove excess moisture, and then add them to the polymer hopper as component A. Screen polyester fiber chips, remove dust and debris in the chips, heat and dry the screened chips with hot air to remove excess moisture, and then add nanophase change temperature control microcapsules (16) for mixing to form component B. Heat and dry the screened chips to remove excess moisture, and then add them to the polymer hopper as component C. Heat and dry the screened chips to remove excess moisture, and then add water-absorbing resin particles (21) for mixing to form component D; S2. Heating, melting and extrusion. Spray components A and B through a core-sheath structure spinneret assembly. Component B forms the core structure to form the first core layer (15), and component A forms the sheath structure to form the first polyester cortex (13). The shape of the spinneret holes for spraying component A is triangular, and the shape of the spinneret holes for spraying component B is circular. Spray components C and D through another core-sheath structure spinneret assembly. Component D forms the core structure to form the second core layer (20), and component C forms the sheath structure to form the second polyester cortex (18). The shape of the spinneret holes for spraying component C is triangular, and the shape of the spinneret holes for spraying component D is circular; S3. Cooling. The formed first composite filament (11) and second composite filament (12) are cooled through their respective channels. Cool air is blown into the channels by a cooling air system to cool the fibers. The first composite filament (11) and the second composite filament (12) are stretched and formed under the drafting action of their respective winding rollers; S4. Sizing treatment: Pass the formed first composite filament (11) and the second composite filament (12) through a sizing machine to form the first outer sizing layer (14) on the outer side of the first composite filament (11) and form the second polyester skin layer (18) on the outer side of the second composite filament (12), namely the first outer sizing layer (14) and the second polyester skin layer (18); S5. Wear-resistant filament polymerization: Wind the wear-resistant fiber (23) around the outer side surface of the second composite filament (12); S6. Fiber coating: Wrap and wind the two fibers of the first composite filament (11) and the second composite filament (12) to form one fiber.

6. The preparation process of a high-strength and fold-resistant polyester composite filament according to claim 5, characterized in that: In the step S1 of slice screening, drying and mixing treatment, the temperature of the heating air is 80 °C and the humidity is not more than 35%.

7. A preparation process for a high-strength and fold-resistant polyester composite filament according to claim 5, characterized in that: In the cooling step S3, the temperature of the cooling air is between 5 °C and 15 °C and the humidity is not more than 35%.

8. A preparation process of a high-strength and fold-resistant polyester composite filament according to claim 5, characterized in that: In the cooling step S3, the wind speed of the cooling air is between 0.8 m / s and 1 m / s.

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