A composite polyester filament and its processing method

Abstract

This invention relates to the field of textile fabrics, specifically to a composite polyester filament and its processing method. The composite polyester filament includes a core filament and an outer filament wound and wrapped around the surface of the core filament, with reinforcing resin filling and covering the spaces between the filaments. The outer filament is first encapsulated by a high-pressure airflow, winding and covering the surface of the core filament in an irregular shape. There are sufficient gaps between the interlaced filaments, and these gaps connect to the outside, allowing the resin to penetrate into the interior more quickly. In addition, the core material uses multiple grooves to further increase the impregnation space. The resin penetrates into the interior while simultaneously covering the exterior, effectively improving the strength of the filament. Multiple strands of the outer filament enter the same channel together and are then encapsulated by high-pressure air onto the surface of the core filament, which can save the volume of the impregnation mold and improve production efficiency. The axial elongation and tensile strength are greatly improved, and the filament has good resilience when subjected to radial compression, making it less prone to bundling.

Description

Technical Field

[0001] This invention relates to the field of textile fabrics, specifically to a composite polyester filament and its processing method. Background Technology

[0002] Composite fiber is a type of multi-component fiber, a term used to describe various types of man-made fibers. A composite fiber contains two or more immiscible polymer fibers on the same cross-section. Resin impregnation can improve the mechanical properties of multi-bundle continuous fibers. Composite filament impregnation processes include whole-bundle impregnation and arranged-bundle impregnation, but each has its drawbacks. Whole-bundle impregnation of composite filaments results in excessively dense filaments, high fiber bundle linear density, and small gaps, making it difficult for resin to completely impregnate the fiber bundles, leading to poor impregnation effect, low resin content, and a structure of internal dry fiber bundles and external resin impregnation layer. This results in weak interlayer bonding, and during tensile failure, the end faces of the whole-bundle composite filaments exhibit a discrete, flocculent distribution of dry fibers, resulting in low strength and poor surface quality. Arranged-bundle impregnation of composite filaments, while allowing simultaneous impregnation of multiple fiber bundles and resin coating, requires a very large molten impregnation mold due to the sheer number of fiber bundles. Therefore, this case arises. Summary of the Invention

[0003] One object of the present invention is to solve at least the above-mentioned problems by means of a composite polyester filament and its processing method.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a composite polyester filament, characterized in that: it includes a core filament and an outer filament wrapped around and covering the surface of the core filament, wherein the gap between the core filament and the outer filament, the gap between the outer filaments, and the exterior of the outer filament are all filled and covered with reinforcing resin.

[0005] Preferably, the core filament is made of polyester, and the surface of the core layer has multiple grooves.

[0006] Preferably, the outer filament is made of nylon.

[0007] Preferably, the raw material for the reinforcing resin is nylon resin.

[0008] A processing method for composite polyester filament includes the following steps:

[0009] Step a: Treat the core wire and outer wire with additives;

[0010] Step b: Dehydrate and dry the core and outer filaments;

[0011] Step c: The core wire and outer wire are guided through the impregnation mold;

[0012] Step d: The core filament and outer filament are first interlaced and compounded into a composite filament in an impregnation mold, and then impregnated with reinforcing resin to form a composite polyester filament.

[0013] Preferably, in step d, the drawing speed is 6-8 mm / s, the impregnation temperature of the reinforcing resin is 280-300 degrees Celsius, the impregnation pressure is 0.4-0.5 MPa, and the tension of the composite polyester filament is 14-15 N.

[0014] Preferably, the number of strands of the outer filament is 20-40.

[0015] Preferably, the impregnation mold includes an interlocking section, a hot-melting section, and a cooling section in sequence from the feeding end to the discharging end. The interlocking section includes an interlocking channel, an outer filament feeding channel, and a high-pressure air channel. The outer filament feeding channel and the high-pressure air channel are both connected to the interlocking channel, and the outer filament feeding channel is closer to the feeding end than the high-pressure air channel.

[0016] Preferably, the hot-melt section includes a hot-melt composite channel, a resin feeding channel, and a heater. The resin feeding channel and the hot-melt composite channel are connected. The heater is fixed to the side wall of the hot-melt composite channel. The cooling section includes a cooling channel and a cooler. The cooler is fixed to the side wall of the cooling channel. The interlocking channel, the hot-melt composite channel, and the cooling channel are connected in sequence. The hot-melt composite channel slopes from top to bottom.

[0017] Preferably, the impregnation mold includes an openable top cover, and the processing procedure using the impregnation mold is as follows: The top cover is opened, and the core filament is guided into the interlacing channel, the hot-melt composite channel, and the cooling channel. The outer filament is then passed through the outer filament feeding channel and also guided into the interlacing channel, the hot-melt composite channel, and the cooling channel. After the top cover is closed, the impregnation mold begins operation. When the core filament passes through the interlacing channel, under the action of high-pressure gas, the outer filament winds around the core filament, interlacing and forming a composite filament. When the composite filament passes through the hot-melt composite channel, the molten reinforcing resin penetrates into the gaps between the core filament and the outer filament, and into the gaps between the outer filaments, forming a reinforcing resin layer on the outside of the outer filament. Finally, the filament is cooled and shaped through the cooling channel to form a composite polyester filament.

[0018] As described above, the composite polyester filament and its processing method provided by the present invention have the following beneficial effects: the outer filament is first enveloped by high-pressure airflow, and wrapped and covered on the surface of the core filament in an irregular shape. There are sufficient gaps between the interlacing filaments, and the gaps are connected to the outside, so that the resin can penetrate into the interior more quickly. In addition, the core material adopts multiple grooves, which further increases the impregnation space. The resin penetrates into the interior and covers the exterior at the same time, which can effectively improve the strength of the filament. In the structure of the composite polyester filament, the core filament is thick and the outer filament is thin. After multiple strands of the outer filament enter the same channel together, they are covered on the surface of the core filament by high-pressure air, which can save the volume of the impregnation mold and improve the production efficiency. The outer filament is wrapped on the surface of the core filament in the form of enveloping filaments, so its axial elongation and tensile strength are greatly improved. Moreover, when the filament is subjected to radial compression, its resilience is good and it is not easy to split. Compared with existing whole-bundle impregnation and arranged-bundle impregnation processes, the composite polyester filament prepared by the process and structure of this invention has a significantly higher fiber content, reaching 60-65%. At the same time, the resin can fully coat each bundle of filaments, effectively improving the resin impregnation effect and increasing the tensile strength by 20-30%. Therefore, while increasing the fiber volume content, it can also further improve the bonding performance between the fiber and the resin matrix, effectively reducing porosity defects. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the composite polyester filament of the present invention.

[0020] Figure 2 This is a schematic diagram of the immersion mold. Detailed Implementation

[0021] The present invention will be further described below through specific embodiments.

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] like Figure 1As shown, the composite polyester filament of the present invention includes a core filament 100 and an outer filament 200 wound and wrapped around the surface of the core filament. The gaps between the core filament 100 and the outer filament 200, the gaps between the outer filaments 200, and the exterior of the outer filament 200 are all filled and covered with reinforcing resin 300. The outer filament 200 is first enveloped by high-pressure airflow, wrapping and covering the core wire surface in an irregular shape. There are sufficient gaps between the interlaced filaments, and the gaps connect to the outside, allowing the resin to penetrate into the interior more quickly. In addition, the core material adopts multiple grooves, further increasing the impregnation space. The resin penetrates into the interior and covers the exterior, which can effectively improve the strength of the filament. In the structure of the composite polyester filament, the core filament 100 is thick, while the outer filament 200 is thin. Multiple strands of the outer filament 200 enter the same channel together and are then wrapped onto the surface of the core filament 100 by high-pressure air. This can save the volume of the impregnation mold and improve production efficiency. The outer filament 200 is wrapped onto the surface of the core filament 100 in the form of enveloping filaments, so its axial elongation and tensile strength are greatly improved. Moreover, when the filament is subjected to radial compression, its resilience is good and it is not easy for it to split. Compared with existing whole-bundle impregnation and arranged-bundle impregnation processes, the composite polyester filament prepared by the process and structure of this invention has a significantly higher fiber content, reaching 60-65%. At the same time, the resin can fully coat each bundle of filaments, effectively improving the resin impregnation effect and increasing the tensile strength by 20-30%. Therefore, while increasing the fiber volume content, it can also further improve the bonding performance between the fiber and the resin matrix, effectively reducing porosity defects.

[0024] The core filament 100 is made of polyester, and the surface of the core layer has multiple grooves. Polyester is characterized by good shape retention, stiffness, and elasticity. The grooves on the surface of the core material can improve the interlocking tightness and increase the gaps between the filling resin.

[0025] The outer filament 200 is made of nylon. Nylon is characterized by high strength, abrasion resistance, moisture absorption, and easy dyeing.

[0026] The raw material for reinforced resin 300 is nylon resin. As a binder between filaments, nylon resin can improve surface quality and enhance interlayer bonding. After melting, nylon resin penetrates and covers the gaps and surface of the filaments.

[0027] The processing method for composite polyester filament includes the following steps:

[0028] Step a: Treat the core wire 100 and the outer wire 200 with additives;

[0029] Step b: Dehydrate and dry the core wire 100 and outer wire 200;

[0030] Step c: The core wire 100 and the outer wire 200 are guided through the impregnation mold;

[0031] Step d: The core filament 100 and the outer filament 200 are first interwoven and compounded in an impregnation mold to form a composite filament, and then impregnated with reinforcing resin 300 to form a composite polyester filament.

[0032] In step d, the drawing speed is 6-8 mm / s, the impregnation temperature of the reinforcing resin 300 is 280-300 degrees Celsius, the impregnation pressure is 0.4-0.5 MPa, and the tension of the composite polyester filament is 14-15 N.

[0033] The number of strands in the outer wire 200 is 20-40.

[0034] like Figure 2 As shown, the impregnation mold, from the inlet to the outlet, includes a cross-linking section 1, a hot-melting section 2, and a cooling section 3. The cross-linking section 1 includes a cross-linking channel 11, an outer filament feeding channel 12, and a high-pressure air channel 13. The outer filament feeding channel 12 and the high-pressure air channel 13 are both connected to the cross-linking channel 11, and the outer filament feeding channel 12 is closer to the inlet than the high-pressure air channel 13. Before the filament and reinforcing resin 300 are thermally bonded, they are first cross-linked in the cross-linking section 1 by high-pressure gas, so that the multi-bundle outer filament 200 is wrapped around the outside of the core filament 100. The cross-linking structure creates pores and improves the elasticity of the filament, facilitating the penetration and coating of the subsequently molten resin. Compressed air is discharged from the inlet of the cross-linking channel 11.

[0035] The hot-melt section 2 includes a hot-melt composite channel 21, a resin feeding channel 22, and a heater 23. The resin feeding channel 22 and the hot-melt composite channel 21 are connected. The heater 23 is fixed to the side wall of the hot-melt composite channel 21. The cooling section 3 includes a cooling channel 31 and a cooler 32. The cooler 32 is fixed to the side wall of the cooling channel 31. The interlocking channel 11, the hot-melt composite channel 21, and the cooling channel 31 are connected in sequence. The hot-melt composite channel 21 slopes downwards. The hot-melt composite channel 21, the interlocking channel 11, and the cooling channel 31 form a Z-shaped channel. The downward slope of the hot-melt composite channel 21 promotes the composite of molten resin and filament. Cooling liquid is introduced into the cooler 32 to heat the cooling channel 31, allowing the resin to cool and solidify rapidly.

[0036] The impregnation mold includes an openable top cover. The processing procedure using the impregnation mold is as follows: Open the top cover and guide the core filament 100 into the interlacing channel 11, the hot melt composite channel 21, and the cooling channel 31. After the outer filament 200 passes through the outer filament feeding channel 12, it is also guided into the interlacing channel 11, the hot melt composite channel 21, and the cooling channel 31. After closing the top cover, the impregnation mold starts to work. When the core filament 100 passes through the interlacing channel 11, under the action of high pressure gas, the outer filament 200 winds around the core filament 100 and interlacs to form a composite filament. When the composite filament passes through the hot melt composite channel 21, the molten reinforcing resin 300 penetrates into the gap between the core filament 100 and the outer filament 200, and into the gap between the outer filaments 200, forming a reinforcing resin 300 layer on the outside of the outer filament 200. Finally, it is cooled and shaped through the cooling channel 31 to form a composite polyester filament.

[0037] The above are merely some specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A composite polyester filament, characterized by: The gap between the core wire and the outer wire, the gap between the outer wires, and the outside of the outer wires are filled and covered with the reinforcing resin; The core wire and the outer wire are guided through the impregnation mold, and the core wire and the outer wire are first interlaced and compounded into a composite wire in the impregnation mold, and then impregnated with the reinforcing resin to form a composite polyester filament; The impregnation mold sequentially includes an interlacing section, a hot melting section, and a cooling section from the feeding end to the discharging end, the interlacing section includes an interlacing channel, an outer wire feeding channel, and a high-pressure gas channel, the outer wire feeding channel and the high-pressure gas channel are in communication with the interlacing channel, and the outer wire feeding channel is closer to the feeding end than the high-pressure gas channel; The hot melting section includes a hot melting compound channel, a resin feeding channel, and a heater, the resin feeding channel and the hot melting compound channel are in communication, the heater is fixedly arranged on the side wall of the hot melting compound channel, the cooling section includes a cooling channel and a cooler, the cooler is fixedly arranged on the side wall of the cooling channel, the interlacing channel, the hot melting compound channel, and the cooling channel are sequentially in communication, and the hot melting compound channel is inclined from top to bottom; The impregnation mold includes an openable upper cover, and the process of using the impregnation mold is as follows: opening the upper cover, guiding the core wire into the interlacing channel, the hot melting compound channel, and the cooling channel, guiding the outer wire into the interlacing channel, the hot melting compound channel, and the cooling channel after passing through the outer wire feeding channel, closing the upper cover, and then the impregnation mold starts to work, the core wire passes through the interlacing channel, the outer wire is wound on the core wire under the action of high-pressure gas, and the core wire and the outer wire are interlaced and compounded into a composite wire, the composite wire passes through the hot melting compound channel, the molten reinforcing resin penetrates into the gap between the core wire and the outer wire, the gap between the outer wires, and forms a reinforcing resin layer outside the outer wires, and finally passes through the cooling channel for cooling and shaping to form a composite polyester filament.

2. A composite polyester filament according to claim 1, characterized in that: The raw material of the core wire is polyester, and a plurality of grooves are distributed on the surface of the core wire.

3. The composite polyester filament according to claim 1, wherein: The raw material of the outer wire is nylon.

4. The composite polyester filament according to claim 1, wherein: The raw material of the reinforcing resin is nylon resin.

5. The method according to any one of claims 1 to 4, wherein the method is characterized in that, The method includes the following steps: Step a, treating the core wire and the outer wire with an auxiliary agent; Step b, dehydrating and drying the core wire and the outer wire; Step c, guiding the core wire and the outer wire through the impregnation mold; Step d, interlacing and compounding the core wire and the outer wire into a composite wire in the impregnation mold, and then impregnating the reinforcing resin to form a composite polyester filament.

6. The method of claim 5, wherein the method further comprises the step of: In step d, the drawing speed is 6-8 mm / s, the impregnation temperature of the reinforcing resin is 280-300 degrees Celsius, the impregnation pressure is 0.4-0.5 MPa, and the tension of the composite polyester filament is 14-15 N. ​ 7. The method of claim 5, wherein the method further comprises the step of: The number of strands of the outer wire is 20-40. ​

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