High-strength non-woven fabric and production process thereof

Abstract

The invention relates to a high-strength non-woven fabric and a production process thereof, and relates to the technical field of cloth production, the high-strength non-woven fabric comprises a basic supporting layer and a function enhancement layer compounded on the basic supporting layer, the basic supporting layer is formed by melt-blowing PET fibers, and the function enhancement layer is formed by laying carbon fiber long fibers. The basic support layer and the function enhancement layer are compounded through ultrasonic welding and a nano adhesive. According to the non-woven fabric, the functional enhancement layer formed by the carbon fiber long fiber laying layer is compounded on the basic supporting layer formed by the PET fiber melt-blowing through ultrasonic welding and the nano adhesive, so that the basic mechanical support is provided through the basic supporting layer, and the air permeability of the non-woven fabric is controlled at the same time; according to the non-woven fabric, the short fibers and the long fibers are compounded through the function enhancement layer so as to bear main stress and improve anisotropic strength, so that the strength of the non-woven fabric is greatly improved, and the non-woven fabric can meet diversified industrial requirements.

Description

Technical Field

[0001] The present application relates to the technical field of fabric production, and in particular to a high-strength non-woven fabric and a production process thereof. Background Art

[0002] Non-woven fabric, also known as non-woven fabric, is a fabric that does not require the traditional spinning and weaving process. It is made by bonding the fibers together directly by physical methods to form a fiber mesh structure, and then reinforced by mechanical, thermal bonding, chemical bonding or mechanical reinforcement. Non-woven fabrics are moisture-proof, breathable, flexible, lightweight, non-combustible, easy to decompose, non-toxic and non-irritating, rich in colors, low in price, and recyclable, so they are widely used in many fields.

[0003] However, ordinary non-woven 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 and low stress transfer efficiency, which results in the strength of the fabric being unable to meet high-strength industrial needs. Summary of the invention

[0004] In order to improve the strength of non-woven fabrics, the present application provides a high-strength non-woven fabric and a production process thereof.

[0005] The present application provides a high-strength non-woven fabric and a production process thereof, which adopts the following technical solutions:

[0006] A high-strength non-woven fabric comprises a base support layer and a functional enhancement layer composited on the base support layer, wherein the base support layer is formed by melt-blown PET fibers, the functional enhancement layer is formed by carbon fiber long fiber plying, and the base support layer and the functional enhancement layer are composited by ultrasonic welding and nano adhesive.

[0007] By adopting the above technical scheme, a functional reinforcement layer formed by carbon fiber long fiber ply is composited with a basic support layer formed by meltblown PET fibers through ultrasonic welding and nano-adhesive, so that the basic support layer provides basic mechanical support while controlling the air permeability of the non-woven fabric. The short fibers and long fibers are composited through the functional reinforcement layer to bear the main stress and improve the anisotropic strength, thereby greatly improving the strength of the non-woven fabric and enabling it to meet diverse industrial needs.

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

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

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

[0011] By adopting the above technical solution, the nano-SiO2 in the interface transition layer connects PET and carbon fiber through hydrogen bonding, thereby greatly enhancing the bonding force between the reinforced layers 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 membrane, and the PTFE composite membrane is coated with an antibacterial coating.

[0013] By adopting the above technical solution and setting a surface functional layer, the non-woven fabric can be breathable and liquid-impermeable due to the microporous structure (pore size 0.2-0.5μm) on the PTFE composite membrane, giving the non-woven fabric hydrophobic and anti-fouling properties. At the same time, an antibacterial coating is coated on the PTFE composite membrane, giving the non-woven fabric antibacterial properties.

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

[0015] By adopting the above technical solution, aramid fiber has the characteristics of high strength, high modulus, high temperature resistance, etc., and combined with the bionic honeycomb structure, it can effectively disperse stress, improve the specific strength and specific stiffness of the material, and improve the impact resistance of the non-woven fabric.

[0016] Another object of the present application is to provide a production process for high-strength non-woven fabrics, using the following technical solution:

[0017] A production process of high-strength non-woven fabric includes:

[0018] S1, melt extrusion, adding PET raw materials into the extruder and melt extruding at a temperature of 265-280°C, the extruded melt is filtered by a 20μm grade metal sintered filter, 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 laying, using a carding machine to card the PET fibers into a thin fiber web with a smooth surface, and then using a laying machine to lay the thin fiber web into multiple layers of fluffy fiber web to achieve the required thickness and fluffiness;

[0021] S4, pre-needling, lower needling, main needling, the fiber web is needle-punched by the pre-needling machine, lower needling machine, and main needling machine to enhance the bonding between the fibers and form a preliminary non-woven fabric structure;

[0022] S5, hot rolling forming, using a hot rolling machine to hot roll the needle-punched non-woven fabric at a certain temperature to further strengthen the fiber structure and give the non-woven fabric a certain shape and dimensional stability;

[0023] S6, thermal bonding, using ultrasonic welding and nano adhesive to composite the laid carbon fiber long fiber layer and the PET fiber layer;

[0024] S7, laminating, coating the carbon fiber long fiber layer with a nano-SiO2 modified adhesive and then laying a PTFE composite film;

[0025] S8, hot rolling compounding, using a hot rolling machine to compound the aramid fiber braided layer on the PTFE composite membrane;

[0026] S9, cooling, the non-woven fabric after heat treatment is naturally cooled or air-cooled to stabilize its structure and performance;

[0027] S10, rolling and storage: the processed non-woven fabric is rolled up and stored under suitable conditions to maintain its performance.

[0028] By adopting the above technical scheme, the PET raw material is put into the extruder for melt extrusion, and then the fiber filaments are sprayed out through the spinning equipment. The fiber filaments are combed, laid and needle-punched to obtain the basic support layer. Then, ultrasonic welding and nano-adhesive are used to composite the laid carbon fiber long fiber layer and the PET fiber layer. The coating and the aramid fiber braided layer are composited by hot rolling. Finally, the composite non-woven fabric is cooled, rolled and stored, thereby completing the production and manufacturing of the non-woven fabric.

[0029] Optionally, the hot rolling mill in S5 includes a machine body and several hot rolling rollers with different diameters and patterns rotatably arranged on the machine body, the machine body is rotatably provided with a cloth guide roller, the non-woven fabric passes through the machine body through the cloth guide roller, the cloth guide roller cooperates with the hot rolling roller to hot roll the non-woven fabric, the machine body is provided with a moving mechanism for driving a rod to move several hot rolling rollers, and the several hot rolling rollers alternately hot roll the non-woven fabric on the guide roller under the action of the moving mechanism.

[0030] During the operation of general hot rolling machines on the market, since the size and texture of the hot rolling rollers on the hot rolling machines are fixed, they can only perform hot rolling on non-woven fabrics with a single shape and texture. When different types of non-woven fabrics need to be hot rolled, the staff is required to disassemble and replace the hot rolling rollers, which is cumbersome, very inconvenient and inefficient.

[0031] By adopting the above technical scheme, a number of hot rolling rollers with different diameters and patterns are rotatably installed on the body of the hot rolling mill, and the different hot rolling rollers can be driven by a moving mechanism to cooperate with the cloth guide roller to hot-roll the non-woven fabric, so that the hot rolling mill can meet the hot rolling requirements of different types of non-woven fabrics, thereby improving the application scope of the hot rolling mill. There is no need to disassemble and replace the hot rolling rollers, which is convenient and fast with high work efficiency.

[0032] Optionally, the moving mechanism includes:

[0033] A movable turntable, the movable turntable is rotatably arranged on the machine body, and a plurality of hot rolling rollers are rotatably arranged on the movable turntable and are evenly distributed in the circumferential direction with the rotating shaft of the movable turntable as the center;

[0034] A ratchet wheel, the ratchet wheel being arranged on the movable turntable;

[0035] A ratchet pawl, the ratchet pawl is vertically slidable and rotatably arranged on the machine body;

[0036] A driving assembly, which is arranged on the machine body and is used to drive the pawl to move. Under the action of the driving assembly, the pawl engages with the ratchet and drives the ratchet to move;

[0037] A limiting assembly is arranged on the machine body and is used to limit the rotation position of the movable turntable.

[0038] By adopting the above technical solution, the limit assembly is unlocked, and the driving assembly 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 movable turntable to rotate. The rotation of the movable turntable drives different hot rolling rollers to move above the guide roller and work with the guide roller, thereby completing the movement and alternating work of several hot rolling rollers.

[0039] Optionally, the driving component includes:

[0040] A first driving plate, wherein the first driving plate is rotatably disposed on the machine body, and the bottom of the pawl is rotatably disposed on the first driving plate;

[0041] A torsion spring, wherein the torsion spring is arranged on the first driving plate and connected to the pawl, wherein the pawl is engaged with the ratchet wheel under the action of the torsion spring, and an arc-shaped guide surface is provided on the inner top wall of the engaging surface where the pawl engages with the ratchet wheel;

[0042] A U-shaped elastic rod is arranged on the machine body and connected to the first driving plate.

[0043] By adopting the above technical solution, the first driving plate is rotated to squeeze the U-shaped elastic rod to move, the first driving plate moves to drive the pawl to move, the pawl moves up to drive the ratchet to rotate, the ratchet rotates to drive the moving turntable to rotate, and when the moving turntable rotates to drive the hot rolling roller on the cloth guide roller to replace and move, the limiting assembly limits the moving turntable and releases the first driving plate. The U-shaped elastic rod returns to its original state and drives the first driving plate to rotate back to its original position. The first driving plate returns to its original position and drives the pawl to move downward. Since an arc-shaped guide surface is provided on the inner top wall of the clamping surface where the pawl and the ratchet are clamped, the pawl will rotate the torsion spring to move until the pawl moves back to its original position and continues to clamp with the ratchet, thereby completing the work of driving the pawl to move and reset.

[0044] Optionally, the limiting component includes:

[0045] A limit block, the limit block is rotatably arranged on the machine body;

[0046] A limit spring, wherein the limit spring is arranged on the machine body and connected to the limit block, a plurality of limit grooves are evenly distributed on the outer side wall of the movable turntable, and the limit block is partially engaged with the limit groove under the action of the limit spring;

[0047] The second driving plate is rotatably arranged on the machine body, and the two ends of the second driving plate are respectively in contact with the first driving plate and the limit block. When the first driving plate rotates to drive the pawl to move upward, the second driving plate drives the limit block to compress the limit spring to rotate.

[0048] By adopting the above technical solution, under normal circumstances, the limit block is partially engaged with the limit groove under the action of the limit spring, thereby limiting the position of the movable turntable; the first drive plate rotates to drive the pawl to move upward while driving the second drive plate to rotate, and the second drive plate rotates to drive the limit block to move, and the limit block compresses the limit spring to move so that the limit block is disengaged from the limit groove, thereby releasing the limiting work on the movable turntable, so that the ratchet can drive the movable turntable to rotate.

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

[0050] 1. The functional enhancement layer formed by carbon fiber long fiber ply is composited on the basic support layer formed by melt-blown PET fiber by ultrasonic welding and nano-adhesive, so that the basic support layer provides basic mechanical support while controlling the air permeability of the non-woven fabric. The short fibers and long fibers are composited through the functional enhancement layer to bear the main stress and improve the anisotropic strength, thereby greatly improving the strength of the non-woven fabric, so that it can meet diverse industrial needs;

[0051] 2. Put the PET raw material into the extruder for melt extrusion and then spray out the fiber filaments through the spinning equipment. Then, the fiber filaments are combed, laid and needled to obtain the basic support layer. Then, ultrasonic welding and nano-adhesive are used to compound the laminated carbon fiber long fiber layer with the PET fiber layer. The lamination and aramid fiber braided layer are compounded by hot rolling. Finally, the compounded non-woven fabric is cooled and rolled up for storage, thereby completing the production of the non-woven fabric.

[0052] 3. By unlocking the limit assembly, use the driving assembly to drive the pawl to move, the movement of the pawl drives the ratchet to rotate, the rotation of the ratchet drives the movable turntable to rotate, the rotation of the movable turntable drives different hot rolling rollers to move above the guide roller and work with the guide roller, thereby completing the movement and alternating work of several hot rolling rollers. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is a schematic cross-sectional view of each layer of the non-woven fabric in Example 1 of the present application;

[0054] Figure 2 This is a production process flow chart of a high-strength non-woven fabric in Example 2 of the present application;

[0055] Figure 3 is a schematic diagram of the three-dimensional structure of the hot rolling mill in Example 2 of the present application;

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

[0057] : 11. base support layer; 12. function enhancement layer; 13. interface transition layer; 14. surface functional layer; 15. composite protective layer; 21. machine body; 22. hot rolling roller; 23. cloth guide roller; 3. moving mechanism; 31. moving turntable; 32. ratchet; 33. pawl; 34. driving assembly; 35. limiting assembly; 36. guide surface; 41. first driving plate; 43. U-shaped spring rod; 44. limiting block; 45. limiting spring; 46. second driving plate; 47. limiting groove. DETAILED DESCRIPTION

[0058] The following is combined with Figure 1 -Attached Figure 4 This application is described in further detail.

[0059] Example 1 of the present application discloses a high-strength non-woven fabric.

[0060] Reference Figure 1The high-strength non-woven fabric includes a base support layer 11 and a functional enhancement layer 12 compounded on the base support layer 11, and the base support layer 11 is formed by melt-blowing PET fibers. The functional enhancement layer 12 is formed by cross-laying of long carbon fiber fibers at ±45°, and the base support layer 11 and the functional enhancement layer 12 are compounded by ultrasonic welding and nano-adhesive. 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, and the nano-SiO2 modified adhesive is coated on the functional enhancement layer 12. A surface functional layer 14 is provided on the interface transition layer 13, and the surface functional layer 14 is a PTFE composite membrane, and an antibacterial coating is coated on the PTFE composite membrane. A composite protective layer 15 is provided on the surface functional layer 14, and the composite protective layer 15 is an aramid fiber braided layer, and the aramid fiber braided layer is woven in a bionic honeycomb structure.

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

[0062] The working principle of Example 1 of the present application is:

[0063] The functional enhancement layer 12 formed by carbon fiber long fiber plying is composited with the basic support layer 11 formed by meltblown PET fibers through ultrasonic welding and nano-adhesive, so that the basic support layer 11 provides basic mechanical support while controlling the air permeability of the non-woven fabric. The short fibers and long fibers are composited through the functional enhancement layer 12 to bear the principal stress and improve the anisotropic strength, thereby greatly improving the strength of the non-woven fabric and enabling it to meet diverse industrial needs.

[0064] Example 2 of the present application discloses a production process for high-strength non-woven fabric.

[0065] Reference Figure 2, a production process of high-strength non-woven fabrics, including S1, melt extrusion, adding PET raw materials into an extruder and melt extruding at a temperature of 265-280°C, filtering the extruded melt with a 20μm-grade metal sintered filter screen, and the filtered melt enters a spinning device; S2, spinning molding, using the spinning device to spray out PET fiber filaments; S3, combing and laying, using a cotton carding machine to comb the PET fibers into a thin fiber web with a smooth surface, and then using a laying machine to lay the thin fiber web into multiple layers of fluffy fiber webs to achieve the required thickness and fluffiness; S4, pre-puncture, lower puncture, and main puncture, using a pre-puncture machine, a lower puncture machine, and a main puncture machine to needle-punch the fiber web to enhance the bonding between the fibers and form a preliminary non-woven fabric structure; S5, hot rolling Forming, hot rolling the needle-punched non-woven fabric at a certain temperature using a hot rolling mill to further strengthen the fiber structure and give the non-woven fabric a certain shape and dimensional stability; S6, thermal bonding, using ultrasonic welding and nano-adhesives to composite the laminated carbon fiber long fiber layer and the PET fiber layer; S7, lamination, coating the carbon fiber long fiber layer with a nano-SiO2 modified adhesive and then laying a PTFE composite film; S8, hot rolling composite, using a hot rolling mill to composite the aramid fiber woven layer on the PTFE composite film; S9, cooling, the heat-treated non-woven fabric is naturally cooled or air-cooled to stabilize its structure and performance; S10, winding and storage: the processed non-woven fabric is wound and stored under appropriate conditions to maintain its performance.

[0066] Reference Figure 3 The hot rolling mill in S5 includes a machine body 21 and a plurality of hot rolling rollers 22 with different diameters and patterns rotatably arranged on the machine body 21. A cloth guide roller 23 is rotatably installed on the machine body 21, and the non-woven fabric passes through the machine body 21 through the cloth guide roller 23. The cloth guide roller 23 cooperates with the hot rolling roller 22 to hot-roll the non-woven fabric. A moving mechanism 3 for driving the plurality of hot rolling rollers 22 to move is arranged on the machine body 21. Under the action of the moving mechanism 3, the plurality of hot rolling rollers 22 alternately hot-roll the non-woven fabric on the cloth 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 driving assembly 34 and a limiting assembly 35. The moving turntable 31 is rotatably mounted on the machine body 21. A plurality of hot rolling rollers 22 are rotatably mounted on the moving turntable 31 and are evenly distributed circumferentially around the rotating shaft 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 is vertically slid by the driving assembly 34 and is rotatably arranged on the machine body 21. The top end of the pawl 33 is engaged with the ratchet 32. An arc-shaped guide surface 36 is provided on the inner top wall of the engaging surface where the pawl 33 is engaged with the ratchet 32. The limiting assembly 35 is arranged on the machine body 21 and is used to limit the rotation position of the moving turntable 31.

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

[0069] Reference Figure 3 and Figure 4 , rotate the first driving plate 41 to squeeze the U-shaped elastic rod 43 to move, the first driving plate 41 moves to drive the pawl 33 to move, the pawl 33 moves up to drive the ratchet 32 ​​to rotate, and the ratchet 32 ​​rotates to drive the moving turntable 31 to rotate. When the moving turntable 31 rotates to drive the hot rolling roller 22 located on the cloth guide roller 23 to replace and move, the limiting assembly 35 limits the moving turntable 31, and releases the first driving plate 41. The U-shaped elastic rod 43 returns to its original state and drives the first driving plate 41 to rotate back to its original position. The first driving plate 41 rotates back to its original position and drives the pawl 33 to move downward. Since an arc-shaped guide surface 36 is provided on the top wall of the clamping surface where the pawl 33 and the ratchet 32 ​​are clamped, the pawl 33 will rotate the torsion spring to move until the pawl 33 moves back to its original position and continues to clamp with the ratchet 32, thereby completing the work of driving the pawl 33 to move and reset.

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

[0071] Reference Figure 3 and Figure 4 Under normal circumstances, the limit block 44 is partially engaged with the limit groove 47 under the action of the limit spring 45, thereby limiting the position of the movable turntable 31; the first drive plate 41 rotates to drive the ratchet 33 to move upward while driving the second drive plate 46 to rotate, and the second drive plate 46 rotates to drive the limit block 44 to move, and the limit block 44 compresses the limit spring 45 to move so that the limit block 44 is disengaged from the limit groove 47, thereby releasing the limiting work on the movable turntable 31, so that the ratchet 32 ​​can drive the movable turntable 31 to rotate.

[0072] The working principle of Example 2 of the present application is:

[0073] The PET raw material is placed in an extruder for melt extrusion and then sprayed out into fiber filaments through a spinning device. The fiber filaments are then combed, laid, and needle-punched to obtain a base support layer 11. Ultrasonic welding and nano-adhesive are then used to composite the laid carbon fiber long fiber layer with the PET fiber layer. The coating and aramid fiber braided layer are then composited by hot rolling. Finally, the composite non-woven fabric is cooled, rolled, and stored, thereby completing the production of the non-woven fabric.

[0074] A number of hot rolling rollers 22 with different diameters and patterns are rotatably mounted on the body 21 of the hot rolling mill. The different hot rolling rollers 22 can be driven by rotating the first driving plate 41 to cooperate with the cloth guide roller 23 to hot-roll the non-woven fabric, thereby enabling the hot rolling mill to meet the hot rolling requirements of different types of non-woven fabrics, thereby improving the application scope of the hot rolling mill. There is no need to disassemble and replace the hot rolling rollers 22, which is convenient and fast with high working efficiency.

[0075] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-strength non-woven fabric, characterized in that: The invention comprises a base support layer (11) and a function enhancement layer (12) compounded on the base support layer (11), wherein the base support layer (11) is formed by melt-blowing PET fibers, and the function enhancement layer (12) is formed by laying carbon fiber long fibers, and the base support layer (11) and the function enhancement layer (12) are compounded by ultrasonic welding and nano adhesive.

2. The high-strength nonwoven fabric according to claim 1, characterized in that: The carbon fiber long fibers are cross-laid at ±45°.

3. A high-strength nonwoven fabric according to claim 2, characterized in that: An interface transition layer (13) is arranged on the function enhancement layer (12); the interface transition layer (13) is a nano-SiO2 modified adhesive; and the nano-SiO2 modified adhesive is coated on the function enhancement layer (12).

4. The high-strength nonwoven fabric according to claim 3, characterized in that: A surface functional layer (14) is provided on the interface transition layer (13); the surface functional layer (14) is a PTFE composite membrane; and an antibacterial coating is coated on the PTFE composite membrane.

5. The high-strength nonwoven fabric according to claim 4, characterized in that: A composite protective layer (15) is arranged on the surface functional layer (14); the composite protective layer (15) is an aramid fiber braided layer; the aramid fiber braided layer is woven in a bionic honeycomb structure.

6. A production process for high-strength non-woven fabric, used to produce the high-strength non-woven fabric as claimed in claim 1, characterized in that: include: S1, melt extrusion, adding PET raw materials into the extruder and melt extruding at a temperature of 265-280°C, the extruded melt is filtered by a 20μm grade metal sintered filter, and the filtered melt enters the spinning equipment; S2, spinning and forming, using spinning equipment to spray out PET fiber filaments; S3, carding and laying, using a carding machine to card the PET fibers into a thin fiber web with a smooth surface, and then using a laying machine to lay the thin fiber web into multiple layers of fluffy fiber web to achieve the required thickness and fluffiness; S4, pre-needling, lower needling, main needling, the fiber web is needle-punched by the pre-needling machine, lower needling machine, and main needling machine to enhance the bonding between the fibers and form a preliminary non-woven fabric structure; S5, hot rolling forming, using a hot rolling machine to hot roll the needle-punched non-woven fabric at a certain temperature to further strengthen the fiber structure and give the non-woven fabric a certain shape and dimensional stability; S6, thermal bonding, using ultrasonic welding and nano adhesive to composite the laid carbon fiber long fiber layer and the PET fiber layer; S7, laminating, coating the carbon fiber long fiber layer with a nano-SiO2 modified adhesive and then laying a PTFE composite film; S8, hot rolling compounding, using a hot rolling machine to compound the aramid fiber braided layer on the PTFE composite membrane; S9, cooling, the non-woven fabric after heat treatment is naturally cooled or air-cooled to stabilize its structure and performance; S10, rolling and storage: the processed non-woven fabric is rolled up and stored under suitable conditions to maintain its performance.

7. The production process of a high-strength nonwoven fabric according to claim 6, characterized in that: The hot rolling mill in S5 comprises a machine body (21) and a plurality of hot rolling rollers (22) of different diameters and patterns rotatably arranged on the machine body (21); a cloth guide roller (23) is rotatably arranged on the machine body (21); the non-woven fabric passes through the machine body (21) through the cloth guide roller (23); the cloth guide roller (23) cooperates with the hot rolling roller (22) to perform hot rolling on the non-woven fabric; a moving mechanism (3) for driving the plurality of hot rolling rollers (22) to move is arranged on the machine body (21); the plurality of hot rolling rollers (22) alternately perform hot rolling on the non-woven fabric on the cloth guide roller (23) under the action of the moving mechanism (3).

8. The production process of a high-strength nonwoven fabric according to claim 7, characterized in that: The moving mechanism (3) comprises: A movable turntable (31), the movable turntable (31) being rotatably disposed on the machine body (21), and a plurality of hot rolling rollers (22) being rotatably disposed on the movable turntable (31) and being evenly distributed in a circumferential direction with the rotating shaft of the movable turntable (31) as the center; A ratchet wheel (32), wherein the ratchet wheel (32) is arranged on the movable turntable (31); A ratchet (33), wherein the ratchet (33) is vertically slidable and rotatably disposed on the machine body (21); A driving assembly (34), the driving assembly (34) being arranged on the machine body (21) and used for driving the ratchet (33) to move, the ratchet (33) being engaged with the ratchet (32) under the action of the driving assembly (34) and driving the ratchet (32) to move; A limiting component (35) is arranged on the machine body (21) and is used to limit the rotation position of the movable turntable (31).

9. The production process of a high-strength nonwoven fabric according to claim 8, characterized in that: The drive assembly (34) comprises: A first driving plate (41), the first driving plate (41) being rotatably disposed on the machine body (21), and the bottom of the ratchet pawl (33) being rotatably disposed on the first driving plate (41); a torsion spring, the torsion spring being arranged on the first driving plate (41) and connected to the pawl (33); the pawl (33) being engaged with the ratchet (32) under the action of the torsion spring; and an arc-shaped guide surface (36) being provided on the inner top wall of the engaging surface where the pawl (33) and the ratchet (32) are engaged; A U-shaped elastic rod (43) is arranged on the machine body (21) and connected to the first driving plate (41).

10. The production process of a high-strength nonwoven fabric according to claim 9, characterized in that: The limiting component (35) comprises: A limit block (44), wherein the limit block (44) is rotatably disposed on the machine body (21); a limit spring (45), the limit spring (45) being arranged on the machine body (21) and connected to the limit block (44); a plurality of limit grooves (47) being evenly distributed on the outer side wall of the movable turntable (31); and the limit block (44) being partially engaged with the limit grooves (47) under the action of the limit spring (45); A second driving plate (46), the second driving plate (46) is rotatably arranged on the machine body (21), two ends of the second driving plate (46) respectively contact the first driving plate (41) and the limit block (44), when the first driving plate (41) rotates to drive the pawl (33) to move upward, the second driving plate (46) drives the limit block (44) to compress the limit spring (45) to rotate.

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