High-strength nonwoven fabric and process for producing the same

Abstract

This application relates to a high-strength nonwoven fabric and its manufacturing process, falling within the technical field of fabric production. The fabric includes a base support layer and a functional reinforcement layer laminated on top of the base support layer. The base support layer is formed by meltblown PET fibers, and the functional reinforcement layer is formed by layup of long carbon fiber layers. The base support layer and the functional reinforcement layer are laminated together using ultrasonic welding and nano-adhesives. This application achieves this by laminating a functional reinforcement layer formed by layup of long carbon fiber layers onto a base support layer made of meltblown PET fibers using ultrasonic welding and nano-adhesives. This allows the base support layer to provide basic mechanical support while controlling the air permeability of the nonwoven fabric. The functional reinforcement layer, by combining short and long fibers, bears the principal stress and improves anisotropic strength, thereby significantly enhancing the strength of the nonwoven fabric and enabling it to meet diverse industrial needs.

Description

Technical Field

[0001] This application relates to the technical field of fabric production, and in particular to a high-strength nonwoven fabric and its production process. Background Technology

[0002] Non-woven fabric, also known as non-woven cloth, is a type of fabric formed without the traditional spinning and weaving process. It is made by directly bonding fibers together using physical methods to form a web structure, which is then reinforced using mechanical, thermal, chemical, or mechanical strengthening methods. Non-woven fabrics are widely used in various fields due to their moisture-proof, breathable, flexible, lightweight, non-flammable, easily degradable, non-toxic, non-irritating, richly colored, inexpensive, and recyclable properties.

[0003] However, ordinary nonwoven fabrics are mostly made of conventional PP (polypropylene) or PET (polyester) short fibers. Due to the short fiber length (usually ≤50mm), there are few effective entanglement points between fibers, resulting in low stress transfer efficiency. Consequently, the strength of the fabric cannot meet the high-strength industrial requirements. Summary of the Invention

[0004] To improve the strength of nonwoven fabrics, this application provides a high-strength nonwoven fabric and its manufacturing process.

[0005] This application provides a high-strength nonwoven fabric and its manufacturing process, which adopts the following technical solution:

[0006] A high-strength nonwoven fabric includes a base support layer and a functional reinforcement layer composited on the base support layer. The base support layer is formed by meltblowing PET fibers, and the functional reinforcement layer is formed by layup of carbon fiber long fibers. The base support layer and the functional reinforcement layer are composited by ultrasonic welding and nano-adhesive.

[0007] By adopting the above technical solution, a functional reinforcement layer is formed by laminating carbon fiber long fibers on a base support layer formed by meltblown PET fibers through ultrasonic welding and nano-adhesive. This provides basic mechanical support through the base support layer while controlling the air permeability of the nonwoven fabric. The functional reinforcement layer combines short and long fibers to bear the principal stress and improve anisotropic strength, thereby greatly improving the strength of the nonwoven fabric and enabling it to meet diverse industrial needs.

[0008] Optionally, the carbon fiber long fibers are cross-laid at ±45°.

[0009] By adopting the above technical solution, carbon fiber long fibers are cross-laid at ±45°, which greatly improves the bidirectional tensile strength of the functional reinforcement layer, thereby enhancing the overall strength of the nonwoven fabric.

[0010] Optionally, an interface transition layer is provided on the functional enhancement layer, the interface transition layer being a nano-SiO2 modified adhesive, the nano-SiO2 modified adhesive being coated on the functional enhancement layer.

[0011] By adopting the above technical solution, the nano-SiO2 of the interface transition layer connects PET and carbon fiber through hydrogen bonding, thereby greatly enhancing the interlayer bonding force and significantly improving the interlayer shear strength.

[0012] Optionally, a surface functional layer is provided on the interface transition layer, the surface functional layer is a PTFE composite film, and an antibacterial coating is coated on the PTFE composite film.

[0013] By adopting the above technical solution and setting a surface functional layer, the nonwoven fabric can achieve air permeability and liquid impermeability due to the microporous structure (pore size 0.2-0.5μm) on the PTFE composite film, giving the nonwoven fabric hydrophobic and anti-fouling properties. At the same time, coating the PTFE composite film with an antibacterial coating gives the nonwoven fabric antibacterial properties.

[0014] Optionally, a composite protective layer is provided on the surface functional layer, the composite protective layer being an aramid fiber woven layer, the aramid fiber woven layer being woven in a biomimetic honeycomb structure.

[0015] By adopting the above technical solutions, aramid fibers possess characteristics such as high strength, high modulus, and high temperature resistance. Combined with a biomimetic honeycomb structure, stress can be effectively dispersed, the specific strength and specific stiffness of the material can be improved, and the impact resistance of nonwoven fabrics can be enhanced.

[0016] Another objective of this application is to provide a production process for high-strength nonwoven fabrics, employing the following technical solution:

[0017] A production process for a high-strength nonwoven fabric includes:

[0018] S1. Melt extrusion: PET raw materials are added to an extruder and melt extruded at a temperature of 265-280℃. The extruded melt is filtered through a 20μm metal sintered screen, and the filtered melt enters the spinning equipment.

[0019] S2, spinning and forming, using spinning equipment to spray out PET fiber filaments;

[0020] S3. Carding and web laying: The PET fibers are carded into a thin fiber web with a flat surface using a carding machine. Then, the thin fiber web is laid into multiple layers of fluffy fiber web using a web laying machine to achieve the required thickness and fluffiness.

[0021] S4. Pre-punching, lower punching, and main punching: The fiber web is needle-punched using a pre-punching machine, a lower punching machine, and a main punching machine to enhance the bonding between fibers and form a preliminary nonwoven fabric structure.

[0022] S5. Hot rolling forming: The needle-punched nonwoven fabric is hot rolled at a certain temperature using a hot rolling mill to further strengthen the fiber structure and at the same time give the nonwoven fabric a certain shape and dimensional stability.

[0023] S6. Thermal bonding: The laid-up carbon fiber long fiber layer is combined with the PET fiber layer using ultrasonic welding and nano adhesive.

[0024] S7. Coating: After coating the carbon fiber long fiber layer with nano-SiO2 modified adhesive, a PTFE composite membrane is laid on top.

[0025] S8. Hot-rolled composite: A aramid fiber braided layer is laminated onto a PTFE composite film using a hot rolling mill.

[0026] S9. Cooling: After heat treatment, the nonwoven fabric is cooled naturally or by air to stabilize its structure and properties.

[0027] S10. Winding and Storage: The processed nonwoven fabric is wound up and stored under suitable conditions to maintain its properties.

[0028] By adopting the above technical solution, PET raw materials are put into an extruder for melt extrusion, and then filaments are sprayed out through a spinning device. After the filaments are combed, laid into a web, and needle-punched, a basic support layer is obtained. Then, the laid carbon fiber long fiber layer is composited with the PET fiber layer using ultrasonic welding and nano-adhesive. The composite layer of film and aramid fiber braiding is carried out by hot rolling. Finally, the composite nonwoven fabric is cooled, wound up, and stored, thus completing the production of nonwoven fabric.

[0029] Optionally, the hot rolling mill in S5 includes a machine body and several hot rolling rolls of different diameters and textures rotatably mounted on the machine body. A guide roller is rotatably mounted on the machine body. The nonwoven fabric passes through the machine body via the guide roller. The guide roller cooperates with the hot rolling rolls to perform hot rolling on the nonwoven fabric. The machine body is provided with a moving mechanism for driving the several hot rolling rolls to move. The several hot rolling rolls alternately perform hot rolling on the nonwoven fabric on the guide roller under the action of the moving mechanism.

[0030] In general, hot rolling mills on the market can only perform hot rolling on non-woven fabrics with a single shape and pattern because the size and texture of the hot rolling rolls are fixed. When it is necessary to perform hot rolling on different types of non-woven fabrics, the hot rolling rolls need to be disassembled and replaced by the workers, which is cumbersome, inconvenient and inefficient.

[0031] By adopting the above technical solution, several hot rolling rolls of different diameters and textures are rotatably installed on the body of the hot rolling mill. The moving mechanism can drive the different hot rolling rolls to cooperate with the guide rolls to perform hot rolling work on the nonwoven fabric. This allows the hot rolling mill to meet the hot rolling requirements of different types of nonwoven fabrics, improves the applicability of the hot rolling mill, eliminates the need to disassemble and replace the hot rolling rolls, and is convenient, fast, and efficient.

[0032] Optionally, the moving mechanism includes:

[0033] A movable turntable is rotatably mounted on the machine body, and several hot rolling rolls are rotatably mounted on the movable turntable and are evenly distributed circumferentially around the axis of rotation of the movable turntable.

[0034] A ratchet, wherein the ratchet is mounted on a movable turntable;

[0035] A pawl, which is vertically sliding and rotatably mounted on the machine body;

[0036] A drive assembly is mounted on the machine body and is used to drive the pawl to move. The pawl engages with the ratchet under the action of the drive assembly and drives the ratchet to move.

[0037] A limiting component is disposed on the machine body and is used to limit the rotational position of the movable turntable.

[0038] By adopting the above technical solution, the limit component is unlocked, and the drive component is used to drive the pawl to move. The movement of the pawl drives the ratchet to rotate, the rotation of the ratchet drives the moving turntable to rotate, and the rotation of the moving turntable drives different hot rolling rolls to move above the guide roll and work together with the guide roll, thereby completing the movement and alternation of several hot rolling rolls.

[0039] Optionally, the driving component includes:

[0040] A first drive plate is rotatably mounted on the machine body, and the bottom of the pawl is rotatably mounted on the first drive plate;

[0041] A torsion spring is disposed on the first drive plate and connected to a pawl. The pawl engages with a ratchet under the action of the torsion spring. An arc-shaped guide surface is provided on the top wall of the engagement surface where the pawl engages with the ratchet.

[0042] The U-shaped spring rod is mounted on the machine body and connected to the first drive plate.

[0043] By adopting the above technical solution, the first drive plate is rotated to squeeze the U-shaped spring rod to move. The movement of the first drive plate drives the pawl to move. The upward movement of the pawl drives the ratchet to rotate. The rotation of the ratchet drives the moving turntable to rotate. When the rotation of the moving turntable drives the hot rolling roller located on the guide roller to move, the limiting component limits the moving turntable. When the first drive plate is released, the U-shaped spring rod returns to its original state and drives the first drive plate to rotate back to its original position. The rotation of the first drive plate back to its original position drives the pawl to move down. Since the inner top wall of the engagement surface where the pawl engages with the ratchet is provided with an arc-shaped guide surface, the pawl will rotate and move with the torsion spring until the pawl moves back to its original position and continues to engage with the ratchet, thus completing the work of driving the pawl to move and reset.

[0044] Optionally, the limiting component includes:

[0045] A limiting block, which is rotatably mounted on the machine body;

[0046] A limiting spring is provided on the machine body and connected to a limiting block. Several limiting grooves are evenly distributed on the outer wall of the movable turntable. Under the action of the limiting spring, the limiting block is partially engaged with the limiting groove.

[0047] The second drive plate is rotatably mounted on the machine body. The two ends of the second drive plate abut against the first drive plate and the limiting block, respectively. When the first drive plate rotates and drives the pawl to move upward, the second drive plate drives the limiting block to compress the limiting spring and rotate.

[0048] By adopting the above technical solution, under normal circumstances, the limiting block is partially engaged with the limiting groove under the action of the limiting spring, thereby limiting the position of the moving turntable; the rotation of the first drive plate drives the pawl to move upward and at the same time drives the second drive plate to rotate. The rotation of the second drive plate drives the limiting block to move. The limiting block compresses the limiting spring and moves, causing the limiting block to disengage from the limiting groove, thereby releasing the limiting work on the moving turntable, so that the ratchet can drive the moving turntable to rotate.

[0049] In summary, this application includes at least one of the following beneficial technical effects:

[0050] 1. By combining a basic support layer made of meltblown PET fibers with a functional reinforcement layer formed by ultrasonic welding and nano-adhesive, which is made of carbon fiber long fiber layup, the basic support layer provides basic mechanical support while controlling the air permeability of the nonwoven fabric. The functional reinforcement layer combines short and long fibers to bear the principal stress and improve anisotropic strength, thereby greatly improving the strength of the nonwoven fabric and enabling it to meet diverse industrial needs.

[0051] 2. By melting and extruding PET raw materials in an extruder, and then spinning fibers through a spinning device, the fibers are combed, laid into a web, and needle-punched to obtain the basic support layer. Then, the laid carbon fiber long fiber layer is composited with the PET fiber layer using ultrasonic welding and nano-adhesive. Finally, the nonwoven fabric is laminated and aramid fiber woven layer is composited by hot rolling. After cooling, the composite nonwoven fabric is wound up and stored, thus completing the nonwoven fabric production process.

[0052] 3. By unlocking the limit component, the drive component drives the pawl to move. The movement of the pawl drives the ratchet to rotate. The rotation of the ratchet drives the moving turntable to rotate. The rotation of the moving turntable drives different hot rolling rolls to move above the guide roll and work together with the guide roll, thereby completing the movement and alternation of several hot rolling rolls. Attached Figure Description

[0053] Figure 1 This is a schematic cross-sectional view of each layer of the nonwoven fabric in Embodiment 1 of this application;

[0054] Figure 2 This is a production process flow diagram of a high-strength nonwoven fabric according to Embodiment 2 of this application;

[0055] Figure 3 This is a three-dimensional structural schematic diagram of the hot rolling mill in Embodiment 2 of this application;

[0056] Figure 4 yes Figure 3 Enlarged schematic diagram of part A in the middle.

[0057] Reference numerals: 11. Basic support layer; 12. Functional enhancement layer; 13. Interface transition layer; 14. Surface functional layer; 15. Composite protective layer; 21. Machine body; 22. Hot rolling roll; 23. Guide roll; 3. Moving mechanism; 31. Moving turntable; 32. Ratchet; 33. Pawl; 34. Drive assembly; 35. Limiting assembly; 36. Guide surface; 41. First drive plate; 43. U-shaped spring rod; 44. Limiting block; 45. Limiting spring; 46. Second drive plate; 47. Limiting groove. Detailed Implementation

[0058] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail.

[0059] Embodiment 1 of this application discloses a high-strength nonwoven fabric.

[0060] Reference Figure 1The high-strength nonwoven fabric includes a base support layer 11 and a functional reinforcement layer 12 laminated on the base support layer 11. The base support layer 11 is formed by melt-blowing PET fibers. The functional reinforcement layer 12 is formed by cross-laying long carbon fibers at ±45°. The base support layer 11 and the functional reinforcement layer 12 are laminated together by ultrasonic welding and nano-adhesive. An interface transition layer 13 is provided on the functional reinforcement layer 12. The interface transition layer 13 is a nano-SiO2 modified adhesive, which is coated on the functional reinforcement layer 12. A surface functional layer 14 is provided on the interface transition layer 13. The surface functional layer 14 is a PTFE composite film coated with an antibacterial coating. A composite protective layer 15 is provided on the surface functional layer 14. The composite protective layer 15 is an aramid fiber braided layer with a biomimetic honeycomb structure.

[0061] Reference Figure 1 The base support layer 11 provides basic mechanical support and controls air permeability, with a thickness range of 0.1-0.3 mm. The functional reinforcement layer 12 bears the principal stress and improves anisotropic strength, with a thickness range of 0.2-0.5 mm. The interface transition layer 13 enhances interlayer bonding (peel strength > 20 N / cm), with a thickness range of 0.01-0.03 mm. The surface functional layer 14 imparts hydrophobic, antifouling, or antibacterial properties, with a thickness range of 0.05-0.1 mm. The composite protective layer 15 improves temperature resistance and puncture resistance, with a thickness range of 0.1-0.2 mm.

[0062] The working principle of Embodiment 1 of this application is as follows:

[0063] A functional reinforcement layer 12, formed by laminating carbon fiber long fibers, is formed on a base support layer 11 made of meltblown PET fibers through ultrasonic welding and nano-adhesive. This allows the base support layer 11 to provide basic mechanical support while controlling the air permeability of the nonwoven fabric. The functional reinforcement layer 12 combines short and long fibers to bear the principal stress and improve anisotropic strength, thereby greatly enhancing the strength of the nonwoven fabric and enabling it to meet diverse industrial needs.

[0064] Embodiment 2 of this application discloses a production process for high-strength nonwoven fabric.

[0065] Reference Figure 2A production process for high-strength nonwoven fabric includes: S1, melt extrusion, where PET raw materials are added to an extruder and melt-extruded at a temperature of 265-280℃. The extruded melt is filtered through a 20μm metal sintered screen, and the filtered melt enters a spinning device; S2, spinning and forming, where PET fiber filaments are spun out using a spinning device; S3, carding and web laying, where the PET fibers are carded into a thin, flat fiber web using a carding machine, and then the thin fiber web is laid into multiple layers of fluffy fiber web using a web laying machine to achieve the required thickness and fluffiness; S4, pre-punching, under-punching, and main-punching, where the fiber web is needle-punched using a pre-punching machine, under-punching machine, and main-punching machine to enhance the bonding between fibers and form a preliminary nonwoven fabric structure; S5, hot rolling. The nonwoven fabric is formed by hot rolling at a certain temperature using a hot rolling mill to further strengthen the fiber structure and give it certain shape and dimensional stability. S6. Hot bonding: The laid-up carbon fiber long fiber layer is composited with the PET fiber layer using ultrasonic welding and nano-adhesives. S7. Coating: A nano-SiO2 modified adhesive is coated onto the carbon fiber long fiber layer, followed by the application of a PTFE composite film. S8. Hot rolling composite: The aramid fiber braided layer is composited onto the PTFE composite film using a hot rolling mill. S9. Cooling: The heat-treated nonwoven fabric is naturally cooled or air-cooled to stabilize its structure and properties. S10. Winding and storage: The processed nonwoven fabric is wound up and stored under suitable conditions to maintain its properties.

[0066] Reference Figure 3 The hot rolling mill in S5 includes a machine body 21 and several hot rolling rolls 22 of different diameters and textures rotatably mounted on the machine body 21. A guide roller 23 is rotatably mounted on the machine body 21, through which the nonwoven fabric passes. The guide roller 23 cooperates with the hot rolling rolls 22 to perform hot rolling on the nonwoven fabric. The machine body 21 is provided with a moving mechanism 3 for driving the several hot rolling rolls 22 to move. Under the action of the moving mechanism 3, the several hot rolling rolls 22 alternately perform hot rolling on the nonwoven fabric on the guide roller 23.

[0067] Reference Figure 3 and Figure 4 The moving mechanism 3 includes a moving turntable 31, a ratchet 32, a pawl 33, a drive assembly 34, and a limiting assembly 35. The moving turntable 31 is rotatably mounted on the machine body 21. Several hot rolling rollers 22 are rotatably mounted on the moving turntable 31 and are evenly distributed circumferentially around the axis of rotation of the moving turntable 31. The ratchet 32 ​​is fixedly mounted on the moving turntable 31 and is coaxially arranged with the moving turntable 31. The pawl 33 slides vertically through the drive assembly 34 and is rotatably mounted on the machine body 21. The top of the pawl 33 engages with the ratchet 32. An arc-shaped guide surface 36 is provided on the inner top wall of the engagement surface where the pawl 33 engages with the ratchet 32. The limiting assembly 35 is provided on the machine body 21 and is used to limit the rotational position of the moving turntable 31.

[0068] Reference Figure 3 and Figure 4 The drive assembly 34 includes a first drive plate 41, a torsion spring, and a U-shaped spring rod 43. The first drive plate 41 is rotatably mounted on the body 21. The bottom of the pawl 33 is rotatably mounted on the outer wall of the first drive plate 41. The torsion spring is fixedly mounted on the first drive plate 41 and fixedly connected to the pawl 33. The U-shaped spring rod 43 is fixedly mounted on the body 21 and connected to the first drive plate 41.

[0069] Reference Figure 3 and Figure 4 The first drive plate 41 is rotated to press the U-shaped spring rod 43 to move. The movement of the first drive plate 41 drives the pawl 33 to move. The pawl 33 moves upward and drives the ratchet 32 ​​to rotate. The rotation of the ratchet 32 ​​drives the moving turntable 31 to rotate. When the rotation of the moving turntable 31 drives the hot rolling roller 22 located on the guide roller 23 to move, the limiting component 35 limits the moving turntable 31. The first drive plate 41 is released, and the U-shaped spring rod 43 returns to its original state, driving the first drive plate 41 to rotate back to its original position. The rotation of the first drive plate 41 to its original position drives the pawl 33 to move downward. Since the inner top wall of the engagement surface where the pawl 33 engages with the ratchet 32 ​​is provided with an arc-shaped guide surface 36, the pawl 33 will rotate and move with the torsion spring until the pawl 33 moves back to its original position and continues to engage with the ratchet 32, thus completing the work of driving the pawl 33 to move and reset.

[0070] Reference Figure 3 and Figure 4 The limiting assembly 35 includes a limiting block 44, a limiting spring 45, and a second drive plate 46. The limiting block 44 is rotatably mounted on the body 21 located below the movable turntable 31. A plurality of limiting grooves 47 are evenly distributed on the outer wall of the movable turntable 31. The limiting spring 45 is fixedly mounted on the body 21 and connected to the limiting block 44. Under the action of the limiting spring 45, one end of the limiting block 44 away from the limiting spring 45 engages with the limiting groove 47. The second drive plate 46 is rotatably mounted on the body 21, and both ends of the second drive plate 46 abut against the first drive plate 41 and the limiting block 44, respectively.

[0071] Reference Figure 3 and Figure 4 Under normal circumstances, the limiting block 44 is partially engaged with the limiting groove 47 under the action of the limiting spring 45, thereby limiting the position of the movable turntable 31. The rotation of the first drive plate 41 drives the pawl 33 to move upward, while simultaneously driving the second drive plate 46 to rotate. The rotation of the second drive plate 46 drives the limiting block 44 to move. The limiting block 44 compresses the limiting spring 45 and moves, causing the limiting block 44 to disengage from the limiting groove 47, thereby releasing the limiting work on the movable turntable 31, allowing the ratchet 32 ​​to drive the movable turntable 31 to rotate.

[0072] The working principle of Embodiment 2 of this application is as follows:

[0073] After the PET raw material is melted and extruded in an extruder, it is spun into fibers through a spinning device. The fibers are then combed, laid into a web, and needle-punched to obtain the basic support layer 11. Then, the laid carbon fiber long fiber layer is composited with the PET fiber layer using ultrasonic welding and nano-adhesive. Finally, the nonwoven fabric is laminated and aramid fiber woven layer is composited by hot rolling. After cooling, the composite nonwoven fabric is wound up and stored, thus completing the nonwoven fabric production process.

[0074] Several hot rolling rolls 22 of different diameters and textures are rotatably installed on the body 21 of the hot rolling mill. Rotating the first drive plate 41 can drive the different hot rolling rolls 22 to cooperate with the guide roll 23 to perform hot rolling work on the nonwoven fabric. This allows the hot rolling mill to meet the hot rolling requirements of different types of nonwoven fabrics, improves the applicability of the hot rolling mill, eliminates the need to disassemble and replace the hot rolling rolls 22, and is convenient, fast, and efficient.

[0075] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-strength nonwoven fabric, characterized in that: It includes a base support layer (11) and a functional reinforcement layer (12) composited on the base support layer (11). The base support layer (11) is formed by melt-blowing of PET fibers, and the functional reinforcement layer (12) is formed by layup of carbon fiber long fibers. The base support layer (11) and the functional reinforcement layer (12) are composited by ultrasonic welding and nano-adhesive. The carbon fiber long fibers are laid up at ±45° cross-layouts; An interface transition layer (13) is provided on the functional enhancement layer (12), and the interface transition layer (13) is a nano-SiO2 modified adhesive, which is coated on the functional enhancement layer (12). A surface functional layer (14) is provided on the interface transition layer (13), the surface functional layer (14) is a PTFE composite film, and an antibacterial coating is coated on the PTFE composite film; A composite protective layer (15) is provided on the surface functional layer (14). The composite protective layer (15) is an aramid fiber braided layer, and the aramid fiber braided layer is woven in a biomimetic honeycomb structure.

2. A production process for high-strength nonwoven fabric, used to produce the high-strength nonwoven fabric as described in claim 1, characterized in that: include: S1. Melt extrusion: PET raw materials are added to an extruder and melt extruded at a temperature of 265-280℃. The extruded melt is filtered through a 20μm metal sintered screen, and the filtered melt enters the spinning equipment. S2, spinning and forming, using spinning equipment to spray out PET fiber filaments; S3. Carding and web laying: The PET fibers are carded into a thin fiber web with a flat surface using a carding machine. Then, the thin fiber web is laid into multiple layers of fluffy fiber web using a web laying machine to achieve the required thickness and fluffiness. S4. Pre-punching, lower punching, and main punching: The fiber web is needle-punched using a pre-punching machine, a lower punching machine, and a main punching machine to enhance the bonding between fibers and form a preliminary nonwoven fabric structure. S5. Hot rolling forming: The needle-punched nonwoven fabric is hot rolled at a certain temperature using a hot rolling mill to further strengthen the fiber structure and at the same time give the nonwoven fabric a certain shape and dimensional stability. S6. Thermal bonding: The laid-up carbon fiber long fiber layer is combined with the PET fiber layer using ultrasonic welding and nano adhesive. S7. Coating: After coating the carbon fiber long fiber layer with nano-SiO2 modified adhesive, a PTFE composite membrane is laid on top. S8. Hot-rolled composite: A aramid fiber braided layer is laminated onto a PTFE composite film using a hot rolling mill. S9. Cooling: After heat treatment, the nonwoven fabric is cooled naturally or by air to stabilize its structure and properties. S10. Winding and Storage: The processed nonwoven fabric is wound up and stored under suitable conditions to maintain its properties.

3. The production process of a high-strength nonwoven fabric according to claim 2, characterized in that: The hot rolling mill in S5 includes a machine body (21) and several hot rolling rolls (22) of different diameters and textures rotatably arranged on the machine body (21). A guide roller (23) is rotatably arranged on the machine body (21). The nonwoven fabric passes through the machine body (21) through the guide roller (23). The guide roller (23) cooperates with the hot rolling rolls (22) to perform hot rolling on the nonwoven fabric. A moving mechanism (3) is provided on the machine body (21) for driving the several hot rolling rolls (22) to move. The several hot rolling rolls (22) alternately perform hot rolling on the nonwoven fabric on the guide roller (23) under the action of the moving mechanism (3).

4. The production process of a high-strength nonwoven fabric according to claim 3, characterized in that: The moving mechanism (3) includes: A movable turntable (31) is rotatably mounted on the machine body (21), and several hot rolling rolls (22) are rotatably mounted on the movable turntable (31) and are evenly distributed circumferentially around the axis of rotation of the movable turntable (31). A ratchet (32) is mounted on a movable turntable (31); A pawl (33) is vertically sliding and rotatably mounted on the body (21); A drive assembly (34) is mounted on the body (21) and is used to drive the pawl (33) to move. The pawl (33) engages with the ratchet (32) under the action of the drive assembly (34) and drives the ratchet (32) to move. Limiting component (35), which is disposed on the body (21) and is used to limit the rotation position of the movable turntable (31).

5. The production process of a high-strength nonwoven fabric according to claim 4, characterized in that: The driving component (34) includes: The first drive plate (41) is rotatably mounted on the body (21), and the bottom of the pawl (33) is rotatably mounted on the first drive plate (41); A torsion spring is provided on the first drive plate (41) and connected to a pawl (33). The pawl (33) engages with a ratchet (32) under the action of the torsion spring. An arc-shaped guide surface (36) is provided on the top wall of the engagement surface where the pawl (33) engages with the ratchet (32). U-shaped spring rod (43) is mounted on the body (21) and connected to the first drive plate (41).

6. The production process of a high-strength nonwoven fabric according to claim 5, characterized in that: The limiting component (35) includes: A limiting block (44) is rotatably mounted on the machine body (21); Limiting spring (45), the limiting spring (45) is set on the machine body (21) and connected to the limiting block (44), and a number of limiting grooves (47) are evenly distributed on the outer side wall of the movable turntable (31). The limiting block (44) is partially engaged with the limiting groove (47) under the action of the limiting spring (45). The second drive plate (46) is rotatably mounted on the body (21). The two ends of the second drive plate (46) abut against the first drive plate (41) and the limiting block (44) respectively. When the first drive plate (41) rotates and drives the pawl (33) to move upward, the second drive plate (46) drives the limiting block (44) to compress the limiting spring (45) and rotate.

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