Superfine bi-component fiber composite needled felt and preparation process thereof

Abstract

The superfine bi-component fiber composite needled felt comprises a needled felt body, the bottom layer of the needled felt body is formed by a base layer, the surface layer of the needled felt body is provided with a wear-resistant layer, the top of the base layer is provided with a high-temperature-resistant layer, and the bottom of the wear-resistant layer is provided with a corrosion-resistant layer. And a flame-retardant layer is arranged between the corrosion-resistant layer and the high-temperature-resistant layer. According to the superfine bi-component fiber composite needled felt and the preparation process thereof, in the preparation process, mixed fibers and superfine PSPA sea-island fibers are added, the wear resistance is improved, and through arrangement of the Portland cement polystyrene foam slurry layer, the superfine glass fiber composite filter material, the reinforcing layer and the polysulfonamide fiber layer, the wear resistance is improved; the needle-punched felt has the advantages that the needle-punched felt is high-temperature-resistant, the overall high-temperature-resistant performance of the needle-punched felt is improved, the corrosion resistance is improved due to the arrangement of the PTFE fibers and the polytetrafluoroethylene film coating layer, the flame retardance of the needle-punched felt is enhanced due to the knitted aluminum silicate fibers and the PPS fiber layer, and the overall use performance of the needle-punched felt is improved.

Description

Technical Field

[0001] The invention relates to the technical field of needle punched felt, in particular to an ultrafine two-component fiber composite needle punched felt and a preparation process thereof. Background Art

[0002] Needle felt is a common filter cloth. Due to its different performance, there are many types. Ultrafine bicomponent fiber composite needle felt is one of them. Ultrafine bicomponent fiber composite needle felt is mainly composed of a base fabric layer and micron-level ultrafine denier fiber layers attached to the upper and lower surfaces of the base fabric layer. These fiber layers include polyester fiber, orange segment-shaped PA / PET bicomponent fiber obtained by mechanical fiber opening to obtain micron-level ultrafine denier fiber, and fine-denier acrylic fiber entangled with these fibers to form a fine and dense pore size. This structural design is intended to improve the overall thermal stability of the product, effectively intercept fine particle dust, improve dust filtration accuracy, and achieve the purpose of energy saving and low emission;

[0003] An ultrafine two-component fiber composite needle-punched felt disclosed in publication number CN208965189U can improve the overall thermal stability of the product, reduce the thermal shrinkage of the product, and prevent the shrinkage of the internal micro-pores from shrinking and clogging due to shrinkage, thereby reducing the air permeability. The mixed fiber is then combed with a specific carding machine fine needle cloth, and the needle punching of a needle punching machine with a reasonable fine needle number and needle frequency, so that the two-component fiber in the orange segment is subjected to fiber opening treatment to obtain micron-level ultrafine denier fiber, which is entangled with the other two fibers to form dense micro gaps, ensuring effective smoke passage, reducing running resistance, and having a good filtering effect on fine dust; at the same time, mechanical fiber opening by combing and needle punching can also achieve the effect of saving time and energy;

[0004] However, the above scheme still has the following problems during use: during use, when the discharged high-temperature substances pass through the needle felt, the filtration efficiency of the needle felt will be affected, and after a long time, the high temperature will destroy the firmness of the needle felt tissue, and the harmful gas will corrode the needle felt. When the discharge volume is large, the friction between the needle felt and the discharged substances is heavy, and the needle felt is easily worn, thereby shortening the service life of the needle felt, and it is necessary to enhance the high temperature resistance and wear resistance of the needle felt.

[0005] Therefore, we proposed an ultrafine two-component fiber composite needle felt and its preparation process in order to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide an ultrafine two-component fiber composite needled felt and a preparation process thereof, so as to solve the problem raised in the above-mentioned background technology that the existing needled felt on the market at present, during use, when the discharged high-temperature substances pass through the needled felt, will destroy the firmness of the tissue of the needled felt, and when the discharge volume is large, the friction between the needled felt and the discharged substances is heavy, which is also easy to cause wear to the needled felt, thereby shortening the service life of the needled felt.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solution: an ultrafine two-component fiber composite needle felt, comprising a needle felt body, wherein the needle felt body is composed of a base layer constituting a bottom layer, and the surface layer of the needle felt body is provided with a wear-resistant layer, a high-temperature resistant layer is provided on the top of the base layer, a corrosion-resistant layer is provided on the bottom of the wear-resistant layer, and a flame-retardant layer is provided between the corrosion-resistant layer and the high-temperature resistant layer.

[0008] Preferably, the base layer is woven from polyester fibers, PET fibers and fine-denier acrylic fibers, and the polyester fibers, PET fibers and fine-denier acrylic fibers are twisted into a single bundle and connected by needle punching.

[0009] Preferably, the wear-resistant layer is mainly composed of mixed fibers and ultrafine PSPA island fibers, and the ultrafine PSPA island fibers are woven vertically and alternately on the outside of the mixed fibers, and the mixed fibers are distributed at equal intervals in the longitudinal direction.

[0010] Preferably, the mixed fiber is woven from three strands of polyester fiber, aramid fiber and acrylic fiber, and the ultrafine PSPA sponge fiber on the outside of the mixed fiber is arranged in a wavy shape.

[0011] Preferably, the corrosion-resistant layer is woven from PTFE fibers, and a polytetrafluoroethylene coating layer is provided on the surface of the PTFE fibers.

[0012] Preferably, the high temperature resistant layer is configured as a double-layer structure, and each layer of the structure is composed of a silicate cement polystyrene foam slurry layer and an ultrafine glass fiber composite filter material, the ultrafine glass fiber composite filter material is woven in a horizontal and vertical interlaced manner, and the outer side of the ultrafine glass fiber composite filter material is covered with a silicate cement polystyrene foam slurry layer, and annular reinforcement layers are fixed at equal intervals on the opposite surfaces of the upper and lower silicate cement polystyrene foam slurry layers, and the upper and lower reinforcement layers are compositely connected together by double rows of aromatic sulfone fiber layers.

[0013] Preferably, the reinforcing layer is formed by ceramic fibers and polyimide fibers connected and woven in a diamond shape, and both the ceramic fibers and the polyimide fibers are combed twice in parallel and laid simultaneously from top to bottom.

[0014] Preferably, the flame retardant layer is a fiber web formed by mutually entangled aluminum silicate fibers and PPS fiber layers, and the aluminum silicate fibers and PPS fiber layers improve the overall flame retardant properties of the needle-punched felt.

[0015] A preparation process of an ultrafine two-component fiber composite needle felt comprises the following steps:

[0016] 1. Raw material preparation:

[0017] ①. Select high-quality polyester fiber, PET-grade fiber, fine-denier acrylic fiber, etc. as basic raw materials, and carry out necessary pretreatment, such as cleaning and drying;

[0018] ②. Preparation of other high-performance materials:

[0019] Combing of polyester fiber, aramid fiber and acrylic fiber;

[0020] Mixing preparation of silicate cement polystyrene foam slurry layer, combing of ultrafine glass fiber composite filter material, double combing and double laying of ceramic fiber and polyimide fiber;

[0021] Aluminum silicate fiber and PPS fiber layer combing;

[0022] 2. Fiber mixing and combing:

[0023] After various fiber raw materials are mixed in a certain proportion, they are combed by a carding machine to arrange the fibers in parallel and remove impurities and short fibers to form a uniform fiber web;

[0024] Polyester fiber, aramid fiber, and acrylic fiber yarn are combed at the same time using the three-combing and three-laying method;

[0025] Coating a polytetrafluoroethylene coating layer on the surface of the PTFE fiber;

[0026] The silicate cement polystyrene foam slurry layer is coated on the outside of the ultra-fine glass fiber composite filter material, and the ceramic fiber and polyimide fiber are combed at the same time by double combing and double laying;

[0027] Aluminum silicate fiber and PPS fiber layers are combed and interwoven;

[0028] 3. Knitting reinforcement:

[0029] The combed fibers are sent to the needle punching machine for needle punching reinforcement. During the needle punching process, the needles on the needle board repeatedly puncture the fiber tissue, causing the fibers to be entangled and embraced, forming a stable three-dimensional connection structure, thereby improving the high temperature resistance, wear resistance, corrosion resistance and flame retardancy of the needle punched felt.

[0030] 4. Heat setting and post-processing:

[0031] The needle-punched felt after needle-punching reinforcement needs to be heat-set to stabilize its structure and performance. Subsequently, other post-processing processes such as calendering, trimming, etc. can be carried out as needed to further improve the quality and appearance of the product.

[0032] Compared with the prior art, the ultrafine bicomponent fiber composite needle felt and its preparation process of the present invention have the following beneficial effects:

[0033] 1. The high temperature resistant layer, silicate cement polystyrene foam slurry layer and ultra-fine glass fiber composite filter material have good high temperature and corrosion resistance. The ceramic fiber and polyimide fiber are mixed in a certain proportion to obtain high temperature resistance. The aromatic sulfone fiber layer has high temperature resistance and high temperature thermal stability, and also has certain chemical resistance, which improves the high temperature resistance of the needle felt.

[0034] 2. Through the wear-resistant layer, the mixed fiber and the ultra-fine PSPA sea-island fiber are used together to obtain a limiting oxygen index of ≥42%, good dust capture effect, high tensile strength, and good wear resistance. It is made of polyester fiber, aramid fiber and acrylic fiber, which improves the wear resistance of the needle-punched felt, reduces wear and increases service life;

[0035] 3. Through the corrosion-resistant layer, a polytetrafluoroethylene coating layer is arranged on the outside of the fiber layer. The polytetrafluoroethylene coating layer is resistant to acid and alkali and is almost insoluble in all solvents, so as to improve the corrosion resistance of the needle-punched felt. The PTFE fiber layer has high corrosion resistance.

[0036] 4. By setting up the flame retardant layer, the fiber web formed by the entanglement of aluminum silicate fiber and PPS fiber layer is used as the fiber layer to improve the overall flame retardant effect of the needle felt. The PPS fiber layer has excellent flame retardant properties, high temperature resistance and non-hydrolysis, thereby improving the flame retardant properties of the needle felt and avoiding combustion at high temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the overall structure of the needle felt of the present invention;

[0038] Figure 2 It is a schematic diagram of the basic organizational structure of the present invention;

[0039] Figure 3 This is a schematic diagram of the wear-resistant layer structure of the present invention;

[0040] Figure 4 This is a schematic diagram of the composition of the hybrid fiber of the present invention;

[0041] Figure 5 This is a schematic diagram of the corrosion-resistant layer structure of the present invention;

[0042] Figure 6 This is a schematic diagram of the high temperature resistant layer structure of the present invention;

[0043] Figure 7 It is a schematic diagram of the structure of the composite filter material of silicate cement polystyrene foam slurry layer and ultra-fine glass fiber of the present invention;

[0044] Figure 8 This is a schematic diagram of the distribution structure of the reinforcement layer and the aromatic sulfone fiber layer of the present invention;

[0045] Fig. 9 This is a schematic diagram of the strengthening layer structure of the present invention;

[0046] Fig.10 It is a schematic diagram of the flame retardant layer structure of the present invention.

[0047] In the figure: 1. needle felt body; 2. base layer; 201. polyester fiber; 202. PET fiber; 203. fine denier acrylic fiber; 3. wear-resistant layer; 301. mixed fiber; 3011. polyester fiber; 3012. aramid fiber; 3013. acrylic fiber filament; 302. ultrafine PSPA island fiber; 4. corrosion-resistant layer; 401. PTFE fiber; 402. polytetrafluoroethylene coating layer; 5. high temperature resistant layer; 501. silicate cement polystyrene foam slurry layer; 502. ultrafine glass fiber composite filter material; 503. reinforcement layer; 5031. ceramic fiber; 5032. polyimide fiber; 504. aromatic sulfone fiber layer; 6. flame retardant layer; 601. aluminum silicate fiber; 602. PPS fiber layer. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Please refer to Figure 1 - Fig.10 As shown, an ultrafine two-component fiber composite needle felt comprises a needle felt body 1, wherein the needle felt body 1 is composed of a base layer 2 as a bottom layer, and a wear-resistant layer 3 is arranged on the surface of the needle felt body 1, a high temperature resistant layer 5 is arranged on the top of the base layer 2, a corrosion-resistant layer 4 is arranged on the bottom of the wear-resistant layer 3, and a flame retardant layer 6 is arranged between the corrosion-resistant layer 4 and the high temperature resistant layer 5, and the base layer 2 is woven from polyester fiber 201, PET fiber 202 and fine-denier acrylic fiber 203, and the polyester fiber 201, PET fiber 202 and fine-denier acrylic fiber 203 are wound into a single bundle for needle-punching connection;

[0050] like Figure 1 - Figure 2As shown, first, the components of the needle felt are briefly introduced. The needle felt body 1 is composed of a base layer 2, a high temperature resistant layer 5, a flame retardant layer 6, a corrosion resistant layer 4 and a wear resistant layer 3 from the inside to the outside, and the base layer 2 is woven with polyester fiber 201, PET fiber 202 and fine denier acrylic fiber 203 as basic textile units, and a basic needle felt bottom layer is formed in a horizontal weaving manner.

[0051] Embodiment 1: In order to improve the overall wear resistance of the needle felt, the following solution is proposed. Figure 1 and Figure 3 - Figure 4 As shown,

[0052] The wear-resistant layer 3 is mainly composed of mixed fibers 301 and ultrafine PSPA sea-island fibers 302, and the ultrafine PSPA sea-island fibers 302 are woven vertically and horizontally on the outside of the mixed fibers 301, and the mixed fibers 301 are distributed at equal intervals in the longitudinal direction. The mixed fibers 301 are woven from three strands of polyester fibers 3011, aramid fibers 3012 and acrylic fibers 3013, and the ultrafine PSPA sponge fibers 302 on the outside of the mixed fibers 301 are arranged in a wavy shape.

[0053] By using mixed fiber 301 in combination with ultrafine PSPA sea island fiber 302, a limiting oxygen index of ≥42%, good dust capture effect and high tensile strength are obtained, so that the needle-punched felt body 1 has good wear resistance, and the polyester fiber 3011, aramid fiber 3012 and acrylic fiber filament 3013 all have good wear resistance, thereby improving the wear resistance of the needle-punched felt, reducing wear and increasing the service life.

[0054] Embodiment 2: In order to improve the overall high temperature resistance of the needle felt, the following solution is proposed. Figure 1 and Figure 6 - Fig. 9 As shown,

[0055] The high temperature resistant layer 5 is set to a double-layer structure, and each layer of the structure is composed of a silicate cement polystyrene foam slurry layer 501 and an ultra-fine glass fiber composite filter material 502, the ultra-fine glass fiber composite filter material 502 is woven in a horizontal and vertical interlaced manner, and the outer side of the ultra-fine glass fiber composite filter material 502 is covered with a silicate cement polystyrene foam slurry layer 501, and an annular reinforcement layer 503 is fixed at equal intervals on the opposite surfaces of the silicate cement polystyrene foam slurry layers 501 on the upper and lower sides, and the upper and lower reinforcement layers 503 are compositely connected together by double rows of aromatic sulfone fiber layers 504, and the reinforcement layer 503 is woven by ceramic fibers 5031 and polyimide fibers 5032 in a diamond shape, and the ceramic fibers 5031 and the polyimide fibers 5032 are both double-lined and combed twice at the same time, and the upper and lower nets are laid at the same time;

[0056] The prepared silicate cement polystyrene foam slurry layer 501 is laid on the outside of the ultra-fine glass fiber composite filter material 502, and is fused and fixed to form an outer structure, and the ceramic fiber 5031 and the polyimide fiber 5032 are woven to form a connecting node, and then the upper and lower structures are fixed together by the aromatic sulfone fiber layer 504, which improves the high temperature resistance of the needle felt while having a certain chemical resistance.

[0057] Example 2: In order to improve the overall corrosion resistance and flame retardancy of the needle felt, the following solution is proposed. Figure 1 , Figure 4 and Fig.10 As shown,

[0058] The corrosion-resistant layer 4 is woven from PTFE fibers 401, and a polytetrafluoroethylene coating layer 402 is provided on the surface of the PTFE fibers 401; the flame-retardant layer 6 is a fiber web formed by entanglement of aluminum silicate fibers 601 and PPS fiber layers 602, and the aluminum silicate fibers 601 and PPS fiber layers 602 improve the overall flame retardancy of the needle-punched felt;

[0059] The outer side of the PTFE fiber 401 is covered with a polytetrafluoroethylene coating layer 402. The polytetrafluoroethylene coating layer 402 is resistant to acid and alkali and is almost insoluble in all solvents, so as to improve the corrosion resistance of the needle-punched felt body 1. The PTFE fiber 401 has high corrosion resistance. The fiber web formed by the entanglement of the aluminum silicate fiber 601 and the PPS fiber layer 602 serves as a fiber layer to improve the overall flame retardant effect of the needle-punched felt body 1. The PPS fiber layer 602 has excellent flame retardant properties, high temperature resistance and non-hydrolysis, thereby improving the flame retardant properties of the needle-punched felt body 1 and avoiding combustion at high temperatures.

[0060] A preparation process of an ultrafine two-component fiber composite needle felt comprises the following steps:

[0061] 1. Raw material preparation:

[0062] ①. Select high-quality polyester fiber 201, PET fiber 202, fine-denier acrylic fiber 203, etc. as basic raw materials, and carry out necessary pretreatment, such as cleaning, drying, etc.;

[0063] ②. Preparation of other high-performance materials:

[0064] Polyester fiber 3011, aramid fiber 3012, acrylic fiber 3013 combing;

[0065] A silicate cement polystyrene foam slurry layer 501 is mixed and prepared, an ultra-fine glass fiber composite filter material 502 is combed, and ceramic fibers 5031 and polyimide fibers 5032 are double-combed and double-laid;

[0066] Aluminum silicate fiber 601 and PPS fiber layer 602 are combed;

[0067] 2. Fiber mixing and combing:

[0068] After various fiber raw materials are mixed in a certain proportion, they are combed by a carding machine to arrange the fibers in parallel and remove impurities and short fibers to form a uniform fiber web;

[0069] Polyester fiber 3011, aramid fiber 3012, and acrylic fiber 3013 are combed and laid at the same time using the three-combing and three-laying method;

[0070] Coating a polytetrafluoroethylene coating layer 402 on the surface of the PTFE fiber 401;

[0071] The silicate cement polystyrene foam slurry layer 501 is coated on the outside of the ultra-fine glass fiber composite filter material 502, and the ceramic fiber 5031 and the polyimide fiber 5032 are combed at the same time by double combing and double laying;

[0072] The aluminum silicate fiber 601 and the PPS fiber layer 602 are combed, interwoven and woven;

[0073] 3. Knitting reinforcement:

[0074] The combed fibers are sent to the needle punching machine for needle punching reinforcement. During the needle punching process, the needles on the needle board repeatedly puncture the fiber tissue, causing the fibers to be entangled and embraced, forming a stable three-dimensional connection structure, thereby improving the high temperature resistance, wear resistance, corrosion resistance and flame retardancy of the needle punched felt.

[0075] 4. Heat setting and post-processing:

[0076] The needle-punched felt after needle-punching reinforcement needs to be heat-set to stabilize its structure and performance. Subsequently, other post-processing processes such as calendering, trimming, etc. can be carried out as needed to further improve the quality and appearance of the product.

[0077] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0078] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0079] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultrafine bicomponent fiber composite needle felt, comprising a needle felt body (1), characterized in that: The needle felt body (1) is composed of a base layer (2) constituting a bottom layer, and the surface layer of the needle felt body (1) is provided with a wear-resistant layer (3), the top of the base layer (2) is provided with a high-temperature resistant layer (5), the bottom of the wear-resistant layer (3) is provided with a corrosion-resistant layer (4), and a flame-retardant layer (6) is provided between the corrosion-resistant layer (4) and the high-temperature resistant layer (5).

2. The ultrafine bicomponent fiber composite needle felt according to claim 1, characterized in that: The base layer (2) is woven from polyester fibers (201), PET fibers (202) and fine-denier acrylic fibers (203), and the polyester fibers (201), PET fibers (202) and fine-denier acrylic fibers (203) are twisted into a single bundle and connected by needle punching.

3. The ultrafine bicomponent fiber composite needle felt according to claim 1, characterized in that: The wear-resistant layer (3) is mainly composed of mixed fibers (301) and ultrafine PSPA island fibers (302), and the ultrafine PSPA island fibers (302) are woven vertically and alternately on the outside of the mixed fibers (301), and the mixed fibers (301) are distributed at equal intervals in the longitudinal direction.

4. The ultrafine bicomponent fiber composite needle felt according to claim 3, characterized in that: The mixed fiber (301) is braided from three strands of polyester fiber (3011), aramid fiber (3012) and acrylic fiber (3013), and the ultra-fine PSPA sea-island fiber (302) on the outside of the mixed fiber (301) is arranged in a wave shape.

5. The ultrafine bicomponent fiber composite needle felt according to claim 1, characterized in that: The corrosion-resistant layer (4) is woven from PTFE fibers (401), and a polytetrafluoroethylene coating layer (402) is provided on the surface of the PTFE fibers (401).

6. The ultrafine bicomponent fiber composite needle felt according to claim 1, characterized in that: The high temperature resistant layer (5) is configured as a double-layer structure, and each layer of the structure is composed of a silicate cement polystyrene foam slurry layer (501) and an ultra-fine glass fiber composite filter material (502), the ultra-fine glass fiber composite filter material (502) is woven in a horizontal and vertical interlaced manner, and the outer side of the ultra-fine glass fiber composite filter material (502) is covered with a silicate cement polystyrene foam slurry layer (501), and annular reinforcement layers (503) are fixed at equal intervals on the opposite surfaces of the upper and lower silicate cement polystyrene foam slurry layers (501), and the upper and lower reinforcement layers (503) are compositely connected together by double rows of aromatic sulfone fiber layers (504).

7. The ultrafine bicomponent fiber composite needle felt according to claim 6, characterized in that: The reinforcing layer (503) is formed by ceramic fibers (5031) and polyimide fibers (5032) being connected and woven in a diamond shape, and both the ceramic fibers (5031) and the polyimide fibers (5032) are combed twice in parallel and laid simultaneously from top to bottom.

8. The ultrafine bicomponent fiber composite needle felt according to claim 1, characterized in that: The flame retardant layer (6) is a fiber web formed by mutually entangled aluminum silicate fibers (601) and a PPS fiber layer (602), and the aluminum silicate fibers (601) and the PPS fiber layer (602) improve the flame retardant properties of the entire needle-punched felt.

9. A process for preparing an ultrafine bicomponent fiber composite needle felt according to any one of claims 1 to 8, characterized in that: The steps include:

1. Raw material preparation: ①, selecting high-quality polyester fiber (201), PET fiber (202), fine-denier acrylic fiber (203) and the like as basic raw materials, and performing necessary pretreatment, such as washing, drying, etc.; ②. Preparation of other high-performance materials: Combing polyester fiber (3011), aramid fiber (3012), acrylic fiber (3013); A silicate cement polystyrene foam slurry layer (501) is mixed and prepared, an ultra-fine glass fiber composite filter material (502) is combed, and ceramic fibers (5031) and polyimide fibers (5032) are double-combed and double-laid; Aluminum silicate fiber (601) and PPS fiber layer (602) are combed; 2. Fiber mixing and combing: After various fiber raw materials are mixed in a certain proportion, they are combed by a carding machine to arrange the fibers in parallel and remove impurities and short fibers to form a uniform fiber web; Polyester fiber (3011), aramid fiber (3012), and acrylic fiber (3013) are combed simultaneously using a three-combing and three-laying method; A polytetrafluoroethylene coating layer (402) is coated on the surface of the PTFE fiber (401); A silicate cement polystyrene foam slurry layer (501) is coated on the outside of the ultra-fine glass fiber composite filter material (502), and ceramic fibers (5031) and polyimide fibers (5032) are combed simultaneously by a double-combing and double-laying method; The aluminum silicate fiber (601) and the PPS fiber layer (602) are combed, interwoven and woven; 3. Knitting reinforcement: The combed fibers are sent to the needle punching machine for needle punching reinforcement. During the needle punching process, the needles on the needle board repeatedly puncture the fiber tissue, causing the fibers to be entangled and embraced, forming a stable three-dimensional connection structure, thereby improving the high temperature resistance, wear resistance, corrosion resistance and flame retardancy of the needle punched felt.

4. Heat setting and post-processing: The needle-punched felt after needle-punching reinforcement needs to be heat-set to stabilize its structure and performance. Subsequently, other post-processing processes such as calendering, trimming, etc. can be carried out as needed to further improve the quality and appearance of the product.

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