A process for preparing microfibers and high-elasticity zero-fold microfibers

Abstract

The microfiber preparation process and high-elasticity zero-fold microfiber of this invention belong to the field of lamination technology for layered products. In the preparation process, the upper and lower ends of the intermediate base layer are both bonded to the surface layer, and the intermediate base layer is in a straight state during lamination. The bending of the upper and lower surface layers is exactly opposite, which can change the internal stress of the laminated fabric. In addition, the intermediate base layer is impregnated with a mixture of polyester polyurethane and polyether polyurethane, which can improve the fold resistance of the base fabric. Furthermore, when the microfiber is laminated, considering the problem of wrinkles on the surface of the upper and lower surface layers during lamination, a fan-shaped expansion column structure is used as a smoothing device. When there are wrinkles on the surface layer, the fan-shaped expansion column can actively protrude, thereby smoothing the wrinkles. Moreover, the top surface of the fan-shaped expansion column is a soft layer, which can effectively protect the fabric, resulting in a fabric with excellent performance.

Description

Technical Field

[0001] This invention relates to the field of lamination technology for layered products, specifically to a microfiber preparation process and a highly elastic zero-fold microfiber. Background Technology

[0002] Existing microfibers are obtained by surface treatment of nonwoven fabrics. In order to enhance their bending resistance and maintain the surface without creases, existing microfibers are generally produced by adding anti-wrinkle modifiers to the microfibers. In addition, a polyurethane layer set on release paper is usually laminated on the surface of the nonwoven fabric. Generally, it is a two-layer laminated structure, which makes it difficult for the surface of the microfibers to form creases after bending. In the prior art, such as patent document 1 (CN114889296A), a wrinkle-resistant environmentally friendly synthetic leather is disclosed. This synthetic leather has multiple layers, including a wrinkle-resistant surface layer, a wrinkle-resistant soft layer, a wrinkle-resistant base layer, another wrinkle-resistant soft layer, and a wrinkle-resistant surface layer arranged sequentially from the outer to the inner side. The process involves processing fibers to form a biodegradable base fabric, followed by impregnation to obtain a pre-treated wrinkle-resistant base layer. Two wrinkle-resistant soft layers are then pressed together under pressure to form a composite layer. Finally, a wrinkle-resistant adhesive is applied to the surface of the composite layer to obtain the environmentally friendly synthetic leather. Although the resulting synthetic leather exhibits significantly increased wrinkle resistance, it does not disclose how the wrinkle-resistant soft layer is pressed onto the outside of the wrinkle-resistant base layer. This results in defects such as uneven adhesive application to the wrinkle-resistant soft layer and insufficient stretching during pressing, leading to wrinkles in the finished product and ultimately affecting the quality of the synthetic leather. Furthermore, in the prior art, such as patent document 2 (CN117183547A), a production equipment for composite nonwoven fabrics is disclosed. The production process involves an attraction-leveling device installed between the upper and lower hot-melt fabrics. This device automatically unfolds the folds of the upper and lower hot-melt fabrics using airflow, and then presses them together using an adaptive hot-melt pressing device. This prevents wrinkles from forming in the resulting nonwoven fabric, improving its quality. However, while the attraction-leveling device can smooth out wrinkles, it does so through negative pressure. If adhesive is applied between the two pressed fabrics, the device will also attract the adhesive, affecting the pressing process and potentially damaging its internal structure. This limits its application. Furthermore, the device is only suitable for flattening two layers of nonwoven fabric. When flattening three layers, only two attraction-leveling devices can be used. Additionally, it cannot correct any misalignment of the nonwoven fabric.

[0003] In summary, existing technologies for multi-layer fiber fabrics have employed methods such as laminating a polyurethane layer onto the fiber surface to prevent creases from forming on the fiber surface after bending. However, while these methods also utilize a flattening device to address wrinkles in the surface lamination layer, they rely on negative pressure to smooth out the wrinkles. This approach is unsuitable for bonding fabric layers that require adhesives between different layers. Furthermore, the different curvatures of the upper and lower outer surface layers during bonding do not consider the impact on the fabric's properties, nor do they account for wrinkles caused by deviations during transport. Therefore, this invention provides a microfiber preparation process and a highly elastic, zero-fold microfiber that can smooth out the lamination layer without using negative pressure, ensures the middle layer remains flat during bonding, guarantees equal deformation of the upper and lower surface layers, and promptly corrects any surface layer misalignment. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a process for preparing ultrafine fibers, the process comprising the following steps:

[0005] I. Layer Preparation:

[0006] Nonwoven fabric is made from fibers. After impregnation with an impregnation solution and subsequent weight reduction treatment, a microfiber intermediate base layer is obtained. The impregnation solution is a mixture of polyester-type polyurethane and polyether-type polyurethane. After impregnation, a nonwoven base fabric containing a saturated polyurethane mixture is formed. The impregnated nonwoven fabric is then passed through an aqueous solution of dimethylformamide, causing the polyurethane to solidify and form cells, thus obtaining a synthetic leather semi-finished product. After weight reduction treatment with toluene, the intermediate base layer is obtained. A mixture of polyurethane resin, DMF, color paste, and leveling agent is coated onto release paper one and heated and dried to form an upper surface layer. A mixture of polyurethane resin, DMF, color paste, and leveling agent is coated onto release paper two and heated and dried to form a lower surface layer. An adhesive layer slurry is prepared by mixing polyester polyol and isocyanate prepolymer as the adhesive layer slurry, or by using polyurethane resin as the adhesive layer slurry.

[0007] II. Surface Layer Lamination:

[0008] The intermediate base layer passes through the intermediate pressing assembly without bending, the upper surface layer bends in a first direction through the upper surface of the intermediate pressing assembly, and the lower surface layer bends in a second direction through the lower surface of the intermediate pressing assembly. After pressing, the upper surface layer, intermediate base layer and lower surface layer form a microfiber fabric, and the first direction and the second direction are opposite.

[0009] Preferably, the adhesive layer paste is provided through the upper and lower surfaces of the intermediate pressing assembly and the interior of the intermediate pressing assembly, and is coated on the contact surface between the upper surface layer and the intermediate base layer, and on the contact surface between the intermediate base layer and the lower surface layer.

[0010] Preferably, the intermediate pressing assembly includes a first outer support circular plate, a second outer support circular plate, an inner pressing assembly, and a first upper pressure roller, a second upper pressure roller, a first lower pressure roller, and a second lower pressure roller disposed between the first and second outer support circular plates. The inner pressing assembly includes a pressure roller body, with its left and right sides respectively fixed to the inner sides of the first and second outer support circular plates. Let O1 be the center of the intermediate pressing assembly; then the intermediate base layer passes through center O1 and is arranged horizontally. The upper surface layer bends after passing through the first upper pressure roller. The lower surface layer is bent and wound around the upper surface of the pressure roller body, and then pressed onto the upper side of the intermediate base layer after passing through the second upper pressure roller. The upper surface layer located between the first and second upper pressure rollers is called the first bent surface layer. The lower surface layer is bent and wound around the lower surface of the pressure roller body after passing through the first lower pressure roller, and then pressed onto the lower side of the intermediate base layer after passing through the second lower pressure roller. The lower surface layer located between the first and second lower pressure rollers is called the second bent surface layer. The bending arc of the first bent surface layer is the same as that of the second bent surface layer, but the bending direction is opposite.

[0011] Preferably, the inner pressing assembly further includes a first smoothing assembly, a first coating assembly, a second smoothing assembly, a second coating assembly, and an intermediate coating assembly. The first and second smoothing assemblies are disposed on the pressure roller body, and the first and second coating assemblies are disposed on the first and second outer support circular plates. The first smoothing assembly is attached to the proximal end of the first curved surface layer near the first upper pressure roller, the first coating assembly is attached to the distal end of the first curved surface layer near the second upper pressure roller, and the second smoothing assembly is attached to the proximal end of the second curved surface layer near the first lower pressure roller. The second coating component is attached to the far end of the second curved surface layer near the second lower pressure roller. An inner guide groove is provided on the inner side of the pressure roller body. The intermediate coating component is disposed in the inner guide groove. The first smoothing component can smooth the wrinkles on the first curved surface layer, and then the first coating component applies adhesive slurry. The second smoothing component can smooth the wrinkles on the second curved surface layer, and then the second coating component applies adhesive slurry. The intermediate coating component can apply adhesive slurry to the upper and lower surfaces of the intermediate base layer.

[0012] Preferably, the pressure roller body includes a central cross handle and a fan-shaped body, which are separated by a fan-shaped notch one and a fan-shaped notch two. Several fan-shaped receiving grooves are respectively provided at the two ends of the fan-shaped body. The first smoothing component and the second smoothing component have the same structure. Both the first smoothing component and the second smoothing component include several fan-shaped expansion columns. The several fan-shaped expansion columns are slidably disposed in the several fan-shaped receiving grooves. By introducing gas into the fan-shaped expansion columns, they expand and slide out of the fan-shaped receiving grooves, thereby smoothing the wrinkles of the first curved surface layer or the second curved surface layer. The first coating component is arranged in the fan-shaped notch one, and the second coating component is arranged in the fan-shaped notch two.

[0013] Preferably, the sector-shaped expansion column includes a first straight side plate, a second straight side plate, a front sector plate group, a rear sector plate group, an upper arc plate group, and a lower arc plate group. The included angle between the extension lines of the first and second straight side plates is α. The front and rear sector plate groups are disposed on the front and rear sides of the first and second straight side plates, respectively. The upper arc plate group is disposed at the upper end of the first and second straight side plates, and the lower arc plate group is disposed at the lower end of the first and second straight side plates. The first straight side plate, the second straight side plate, the front sector plate group, the rear sector plate group, the upper arc plate group, and the lower arc plate group form a closed space. The first and second straight side plates can move closer to or further away from each other while maintaining the included angle α unchanged.

[0014] Preferably, the first coating assembly and the second coating assembly have the same structure, each including a plurality of coating rollers, a first linkage frame group and a second linkage frame group disposed on both sides of the plurality of coating rollers, and the two sides of the plurality of coating rollers are respectively slidably disposed on the first outer support circular plate and the second outer support circular plate. Two sets of first guide groove groups are provided on the first outer support circular plate, and two sets of second guide groove groups are provided on the second outer support circular plate. The first guide groove groups and the second guide groove groups have the same structure, each composed of a plurality of elongated guide grooves. An upper [unclear] is provided above the first outer support circular plate. A pressure roller guide groove 1 is provided below a lower pressure roller guide groove 1. An upper pressure roller guide groove 2 is provided above a second outer support circular plate and a lower pressure roller guide groove 2 is provided below it. The first and second upper pressure rollers are respectively located in the upper pressure roller guide groove 1 and the upper pressure roller guide groove 2 at both ends. The first and second lower pressure rollers are respectively located in the lower pressure roller guide groove 1 and the lower pressure roller guide groove 2. Let the center of the first outer support circular plate be O2. Then the axis of the long guide groove passes through the center O2. The spacing between the long guide grooves of the first guide groove group or the second guide groove group is the same.

[0015] Preferably, the radius of the pressure roller body is R, the radius of the circle containing the center of the arc on the side of the long guide groove close to the center O2 is R3, and the radius of the circle containing the center of the arc on the side of the long guide groove away from the center O2 is R2, then R2>R>R3. A telescopic cylinder is provided at the first outer support circular plate and the second outer support circular plate. One end of the telescopic cylinder is located at the center O2, and the other end is located at the end of the coating roller, so that the coating roller can correct and guide the skew of the upper and lower surface layers.

[0016] Preferably, the intermediate coating assembly includes a third coating assembly disposed above the inner guide groove and a fourth coating assembly disposed below the inner guide groove. The third coating assembly and the fourth coating assembly have the same structure, each including a parallelogram support, a second coating roller, a first rotating telescopic frame and a second rotating telescopic frame. The second coating roller is disposed inside the parallelogram support. One end of the first rotating telescopic frame and one end of the second rotating telescopic frame are disposed on the parallelogram support. The other end of the first rotating telescopic frame and the other end of the second rotating telescopic frame are both disposed on the pressure roller body.

[0017] It also includes a highly elastic zero-fold microfiber, which comprises an upper surface layer, an intermediate base layer and a lower surface layer stacked sequentially, characterized in that: the highly elastic zero-fold microfiber is made by the microfiber preparation process.

[0018] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0019] 1. In the microfiber preparation process of the present invention, a surface layer is attached to both the upper and lower ends of the intermediate base layer, and the intermediate base layer is in a straight state when pressed, while the upper and lower surface layers are bent in opposite directions, thereby changing the internal stress of the pressed fabric. In addition, the intermediate base layer is impregnated with a mixture of polyester polyurethane and polyether polyurethane, which makes the base fabric more fold-resistant. Furthermore, since a resin layer is attached to the intermediate base layer, its fold-resistant effect is good.

[0020] 2. When applying the upper and lower surface layers of this invention, the problem of surface wrinkles is taken into consideration, and the wrinkle smoothing operation is separated from the adhesive application operation, thereby ensuring smooth pressing of the base fabric. The smoothing device of this application adopts a fan-shaped expansion column structure. When there are wrinkles in the surface layer, the fan-shaped expansion column can actively protrude to smooth the wrinkles. Moreover, the top surface of the fan-shaped expansion column is a soft layer, which can protect the fabric well. Furthermore, the use of expanding gas for smoothing can make the smoothing effect better. In addition, the rotation speed between the pressure rollers can be adjusted to adjust the initial pressure of the fabric on the fan-shaped expansion column, which can improve the intelligence of the equipment application. In addition to performing the coating operation, the coating component of this invention can also change the axial direction of the coating roller, so that it can correct the fabric deviation in time during coating without adding an additional correction device, thus saving installation space.

[0021] 3. The intermediate coating component of the present invention is adapted to the working environment of conveying the intermediate base layer on a flat surface. It is set as a parallelogram support structure. By rotating the coating roller on the parallelogram support, the purpose of correction can be achieved well and quickly by operating the rotation angle of the parallelogram support. In addition, the first and second rotating telescopic frames set on the parallelogram support can not only rotate but also extend and retract, thereby adjusting the gap between the coating rollers. It can also press and smooth out wrinkles in the intermediate base layer. A fan-shaped notch is opened on the pressure roller body, so that the first coating component and the second coating component can be slidably set in the first and second outer support circular plates. Guide groove groups are set on both the first and second outer support circular plates, and the guide groove groups are composed of several long guide grooves, so as to flexibly control the different distances of the left end and the right end of the coating roller from the center, thereby adaptively correcting the fabric layer.

[0022] 4. The fan-shaped expansion column of the present invention uses an airbag for expansion. During expansion and deformation, the first and second straight plates move away from or towards each other at a constant angle. This arrangement makes the expansion and contraction of the fan-shaped expansion column controllable. It prevents the situation where, due to the uncontrollable deformation of the upper and lower arc plate groups, the side plates and the middle partition plate in the fan-shaped receiving groove get stuck in the fan-shaped receiving groove due to mismatched angles after collision deformation. This better achieves the purpose of smoothing out wrinkles in the material. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the highly elastic zero-fold microfiber of this application;

[0024] Figure 2A schematic diagram of the preparation of the microfiber layer and the surface lamination;

[0025] Figure 3 Exploded view of the intermediate pressing assembly;

[0026] Figure 4 (a) is a schematic diagram of one of the structures of the intermediate pressing assembly;

[0027] Figure 4 (b) is another structural schematic diagram of the intermediate pressing assembly;

[0028] Figure 5 This is a schematic diagram of the cross-sectional structure of the intermediate pressing component;

[0029] Figure 6 (a) is Figure 4 (a) Side view;

[0030] Figure 6 (b) is Figure 6 (a) Schematic diagram of the cross-sectional structure along AA;

[0031] Figure 7 (a) is a schematic diagram of one of the structures of the pressure roller body;

[0032] Figure 7 (b) is another structural schematic diagram of the pressure roller body;

[0033] Figure 7 (c) is a cross-sectional structural diagram of the main body of the pressure roller;

[0034] Figure 8-9 This is a schematic diagram of the intermediate pressing assembly structure, excluding the upper surface layer and part of the main body of the pressure rollers;

[0035] Figure 10 (a) is a schematic diagram of the main structure of the fan-shaped expansion;

[0036] Figure 10 (b) Structural diagram of the front or rear sector plate assembly;

[0037] Figure 11-13 This is a schematic diagram of the structure of the third or fourth coating component;

[0038] Figure 14 (a) is a schematic diagram of either the upper pressure roller body or the lower pressure roller body;

[0039] Figure 14 (b) is another structural schematic diagram of the upper pressure roller body or the lower pressure roller body;

[0040] Figure 14 (c) is a schematic diagram of the bottom structure of the upper pressure roller body or the lower pressure roller body;

[0041] Figure 14 (d) is Figure 14 (c) Schematic diagram of cross-sectional structure;

[0042] Figure 15 This is a schematic diagram of the fan-shaped expansion main structure in another embodiment;

[0043] Figure 16 (a) is a schematic diagram of the arc-shaped frame;

[0044] Figure 16 (b) is a schematic diagram of the ring-shaped main body.

[0045] The components are as follows: 1. Intermediate base layer; 2. Upper surface layer; 3. Lower surface layer; 4. Feeding roller one; 5. Feeding roller two; 6. Feeding roller three; 7. Intermediate pressing assembly; 8. Rewinding roller one; 9. Rewinding roller two; 10. Release paper one; 11. Release paper two; 12. First outer support circular plate; 13. Second outer support circular plate; 14. First upper pressure roller; 15. Second upper pressure roller; 16. First lower pressure roller; 17. Second lower pressure roller; 18. Inner pressing assembly; 19. Pressure roller body; 20. First smoothing assembly; 21. First coating assembly; 22. Second smoothing assembly; 23. Second coating assembly; 24. Intermediate coating assembly; 25. Intermediate crossbar; 26. Fan-shaped body; 27. Fan-shaped receiving groove. 28. Fan-shaped expansion column; 29. ​​Fan-shaped notch one; 30. Fan-shaped notch two; 31. Coating roller one; 32. First linkage frame group; 33. Second linkage frame group; 34. First guide groove group; 35. Second guide groove group; 36. Upper pressure roller guide groove one; 37. Lower pressure roller guide groove one; 38. Upper pressure roller guide groove two; 39. Lower pressure roller guide groove two; 40. Inner guide groove; 41. Third coating assembly; 42. Fourth coating assembly; 43. Coating roller two; 44. Parallelogram bracket; 45. First rotating telescopic frame; 46. Second rotating telescopic frame; 47. First straight side plate; 48. Second straight side plate; 49. Upper arc plate group; 50. Lower arc plate group; 51. Front fan-shaped plate group; 5 2. Rear fan-shaped plate assembly; 53. First short beam; 54. Second short beam; 55. First straight beam; 56. Second straight beam; 57. Column one; 58. Left support ear; 59. Right support ear; 60. Column two; 61. Protruding column one; 62. Protruding column two; 63. Slot hole; 64. Column hole; 65. Roller body one; 66. Rotating shaft two; 67. Connecting assembly; 68. Rotating block; 69. Shaft hole; 70. Upper rotating column; 71. Lower rotating column; 72. Clearance groove; 74. Lower pressure roller body; 75. First side plate; 76. Second side plate; 77. Arc plate one; 78. Sloping side plate; 79. Arc plate two; 80. Upper side plate; 81. Lower side plate; 82. Middle partition plate; 83. First mounting hole; 84. 85. First mounting hole; 86. First through groove; 87. Second through groove; 88. First arc plate; 89. Second arc plate; 90. Third arc plate; 91. Fourth arc plate; 92. First elastic stretching membrane; 93. Second elastic stretching membrane; 94. Third elastic stretching membrane; 95. Fourth elastic stretching membrane; 96. First arc plate; 97. Second arc plate; 98. First horizontal guide post; 99. Second horizontal guide post; 100. First guide roller; 101. Second guide roller; 102. Long strip guide groove; 103. Arc frame; 104. Annular body; 105. Arc guide groove; 106. First inner arc; 107. Second outer arc; 108. Third arc; 109. Fourth arc. Detailed Implementation

[0046] The present invention will be further described below with reference to embodiments. However, the present invention is not limited to the following embodiments. The implementation conditions used in the embodiments can be further adjusted according to different requirements of specific applications, and the implementation conditions not specified are conventional conditions in the industry. The technical features involved in the various embodiments of the present invention can be combined with each other as long as they do not conflict with each other.

[0047] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0048] Example 1

[0049] like Figures 1-14 , Figure 16 As shown, a process for preparing ultrafine fibers includes the following steps:

[0050] I. Layer Preparation:

[0051] Nonwoven fabric is made from fibers. After being impregnated with an impregnation solution, the nonwoven fabric undergoes a weight reduction treatment to obtain an ultrafine fiber intermediate base layer 1. The impregnation solution can be a mixture of polyester polyurethane of type TD5070 and polyether polyurethane of type TDW18ET. After impregnation, a nonwoven fabric base fabric containing saturated polyurethane mixed slurry is formed. The impregnated nonwoven fabric is then passed through an aqueous solution of dimethylformamide of a certain concentration at a certain temperature to allow the polyurethane to solidify and form cells, thus obtaining a synthetic leather semi-finished product. After weight reduction treatment with toluene at a certain temperature, the intermediate base layer 1 is obtained. The intermediate base layer 1 can be wound onto the feeding roller 4.

[0052] A certain amount of polyurethane resin, DMF, color paste and leveling agent mixture is coated on release paper 10 and heated and dried at a certain temperature to form upper surface layer 2. The upper surface layer 2 can be wound into the feeding roller 5 for storage.

[0053] A certain amount of polyurethane resin, DMF, color paste and leveling agent mixture is coated on release paper 211, and then heated and dried at a certain temperature to form a lower surface layer 3. The lower surface layer 3 can be wound into the feeding roller 36 for storage.

[0054] To prepare the adhesive layer slurry, a certain amount of polyester polyol and isocyanate prepolymer are mixed, or polyurethane resin is used directly as the adhesive layer slurry.

[0055] II. Surface Layer Lamination:

[0056] The intermediate base layer 1 passes through the intermediate pressing assembly 7 without bending. The upper surface layer 2 bends in a first direction and passes through the upper surface of the intermediate pressing assembly 7. The lower surface layer 3 bends in a second direction and passes through the lower surface of the intermediate pressing assembly 7. After pressing, the upper surface layer 2, the intermediate base layer 1, and the lower surface layer 3 form a microfiber fabric. The first direction and the second direction are opposite, such as the first direction facing downward and the second direction facing upward.

[0057] In addition, the adhesive layer paste can be provided through the upper and lower surfaces of the intermediate pressing assembly 7 and the interior of the intermediate pressing assembly 7, and coated on the contact surface between the upper surface layer 2 and the intermediate base layer 1, and coated on the contact surface between the intermediate base layer 1 and the lower surface layer 3.

[0058] like Figure 2 , Figure 6 As shown, the intermediate pressing assembly 7 includes a first outer support circular plate 12, a second outer support circular plate 13, an inner pressing assembly 18, and a first upper pressure roller 14, a second upper pressure roller 15, a first lower pressure roller 16, and a second lower pressure roller 17 disposed between the first outer support circular plate 12 and the second outer support circular plate 13. The inner pressing assembly 18 includes a pressure roller body 19, the left and right sides of which are respectively fixedly disposed on the inner sides of the first outer support circular plate 12 and the second outer support circular plate 13. Let the center of the intermediate pressing assembly 7 be O1. The intermediate base layer 1 passes through the center O1 and is arranged horizontally. The upper surface layer 2 passes through the first upper pressure roller... Roller 14 is bent and wound around the upper surface of the pressure roller body 19, and then pressed onto the upper side of the intermediate base layer 1 after passing through the second upper pressure roller 15. The upper surface layer 2 located between the first upper pressure roller 14 and the second upper pressure roller 15 is called the first curved surface layer. The lower surface layer 3 is bent and wound around the lower surface of the pressure roller body 19 after passing through the first lower pressure roller 16, and then pressed onto the lower side of the intermediate base layer 1 after passing through the second lower pressure roller 17. The lower surface layer 3 located between the first lower pressure roller 16 and the second lower pressure roller 17 is called the second curved surface layer. The curvature of the first curved surface layer is the same as that of the second curved surface layer, but the curvature directions are opposite.

[0059] Let γ1 be the angle between the connection between the axis of the first upper pressure roller 14 and the center O1 and the horizontal line, β1 be the angle between the connection between the axis of the second upper pressure roller 15 and the center O1 and the horizontal line, γ2 be the angle between the connection between the axis of the first lower pressure roller 16 and the center O1 and the horizontal line, and β2 be the angle between the line connecting the axis of the second lower pressure roller 17 and the center O1 and the horizontal line. Then β1=β2, γ1=γ2, γ1>β1, the curvature of the upper surface layer 2 is γ1-β1, and the curvature of the lower surface layer 3 is γ2-β2.

[0060] like Figure 2As shown, it also includes a take-up roller 1 8 and a take-up roller 2 9. The release paper 10 on the unloading roller 2 5 is wound around the take-up roller 1 8 after passing through the first guide roller. The release paper 11 on the unloading roller 3 6 is wound around the take-up roller 2 9 after passing through the second guide roller. In order to make the arrangement structure compact, the center of the unloading roller 2 5, the center of the take-up roller 1 8, the center of the take-up roller 2 9 and the center of the unloading roller 3 6 all pass through an arc with O1 as the center. The unloading roller 2 5 and the take-up roller 1 8 are symmetrical with the unloading roller 3 6 and the take-up roller 2 9 about the horizontal line passing through the center O1.

[0061] like Figures 3-6 As shown, the inner pressing assembly 18 further includes a first smoothing assembly 20, a first coating assembly 21, a second smoothing assembly 22, a second coating assembly 23, and an intermediate coating assembly 24. The first smoothing assembly 20 and the second smoothing assembly 22 are disposed on the pressure roller body 19, and the first coating assembly 21 and the second coating assembly 23 are disposed on the first outer support circular plate 12 and the second outer support circular plate 13. The first smoothing assembly 20 is attached to the proximal end of the first curved surface layer near the first upper pressure roller 14, the first coating assembly 21 is attached to the distal end of the first curved surface layer near the second upper pressure roller 15, and the second smoothing assembly 22 is attached to the distal end of the second curved surface layer near the first lower pressure roller 16. At the proximal end of the curved surface layer, the second coating component 23 is attached to the distal end of the second curved surface layer near the second lower pressure roller 17. An inner guide groove 40 is provided on the inner side of the pressure roller body 19. The intermediate coating component 24 is disposed in the inner guide groove 40. The first smoothing component 20 can smooth the wrinkles on the first curved surface layer, and then the first coating component 21 applies adhesive slurry. The second smoothing component 22 can smooth the wrinkles on the second curved surface layer, and then the second coating component 23 applies adhesive slurry. The intermediate coating component 24 can apply adhesive slurry to the upper and lower surfaces of the intermediate base layer 1.

[0062] The first smoothing component 20 and the second smoothing component 22 have the same structure. The pressure roller body 19 includes a middle horizontal handle 25 and a fan-shaped body 26. The middle horizontal handle 25 and the fan-shaped body 26 are separated by a fan-shaped notch 1 29 and a fan-shaped notch 20. Several fan-shaped receiving grooves 27 are respectively provided at the two ends of the fan-shaped body 26. The first smoothing component 20 and the second smoothing component 22 both include several fan-shaped expansion columns 28. The several fan-shaped expansion columns 28 are slidably disposed in the several fan-shaped receiving grooves 27. By introducing gas into the fan-shaped expansion columns 28, they expand and slide out from the fan-shaped receiving grooves 27, thereby smoothing the wrinkles of the first curved surface layer or the second curved surface layer. The first coating component 21 is arranged in the fan-shaped notch 1 29, and the second coating component 23 is arranged in the fan-shaped notch 20.

[0063] The first coating component 21 and the second coating component 23 have the same structure, such as Figures 5-9 As shown, each includes several coating rollers 31, a first linkage frame group 32 and a second linkage frame group 33 disposed on both sides of the coating rollers 31. The coating rollers 31 are slidably disposed on the first outer support circular plate 12 and the second outer support circular plate 13 respectively. Two sets of first guide groove groups 34 are provided on the first outer support circular plate 12, and two sets of second guide groove groups 35 are provided on the second outer support circular plate 13. The first guide groove groups 34 and the second guide groove groups 35 have the same structure, each consisting of several elongated guide grooves 102. An upper pressure roller guide groove 36 is provided above the first outer support circular plate 12, and a lower pressure roller guide groove 36 is provided below the first outer support circular plate 12. The pressure roller guide groove 1 37 is provided above the second outer support circular plate 13, the upper pressure roller guide groove 2 38 is provided above the second outer support circular plate 13, and the lower pressure roller guide groove 2 39 is provided below the second outer support circular plate 13. The first upper pressure roller 14 and the second upper pressure roller 15 are respectively located in the upper pressure roller guide groove 1 36 and the upper pressure roller guide groove 2 38. The first lower pressure roller 16 and the second lower pressure roller 17 are respectively located in the lower pressure roller guide groove 1 37 and the lower pressure roller guide groove 2 39. Let the center of the first outer support circular plate 12 be O2. Then the axis of the elongated guide groove 102 passes through the center O2. The spacing between the elongated guide grooves 102 of the first guide groove group 34 or the second guide groove group 35 is the same.

[0064] like Figure 3 , Figures 11-13 As shown, the intermediate coating assembly 24 includes a third coating assembly 41 disposed above the inner guide groove 40 and a fourth coating assembly 42 disposed below the inner guide groove 40. The third coating assembly 41 and the fourth coating assembly 42 have the same structure, each including a parallelogram support 44, a second coating roller 43, a first rotating telescopic frame 45 and a second rotating telescopic frame 46. The second coating roller 43 is disposed inside the parallelogram support 44. One end of the first rotating telescopic frame 45 and one end of the second rotating telescopic frame 46 are disposed on the parallelogram support 44. The other end of the first rotating telescopic frame 45 and the other end of the second rotating telescopic frame 46 are disposed on the pressure roller body 19.

[0065] In addition, to facilitate the installation of the intermediate coating assembly 24, the pressure roller body 19 includes an upper pressure roller body and a lower pressure roller body 74, wherein the upper pressure roller body and the lower pressure roller body 74 have the same structure, such as... Figure 14As shown, the upper pressure roller body includes a first side plate 75, a second side plate 76, an arc-shaped plate 77, an inclined side plate 78, an upper side plate 80, an arc-shaped plate 79, a middle partition plate 82, and a lower side plate 81. The first side plate 75 and the second side plate 76 are arranged parallel to each other. Between the first side plate 75 and the second side plate 76, from bottom to top, are arranged the lower side plate 81, the arc-shaped plate 79, the upper side plate 80, the inclined side plate 78, the middle partition plate 82, and the arc-shaped plate 77. There are several middle partition plates 82. The inclined side plate 78 and the first side plate 75... The fan-shaped receiving groove 27 is formed by the second side plate and several intermediate partition plates 82. The first mounting groove 85 is formed by the first side plate 75, the second side plate 76, the second arc plate 79, the first arc plate 77 and the lower side plate 81. The third coating component 41 and the fourth coating component 42 are installed in the first mounting groove 85. The lower side plate 81 is provided with a first mounting hole 83 and a second mounting hole 84 respectively. The first rotating telescopic frame 45 and the second rotating telescopic frame 46 are installed in the first mounting hole 83 and the second mounting hole 84 respectively.

[0066] A second passage groove 87 and a first passage groove 86 are respectively provided at the first mounting groove 85 of the arc plate 2 79 and the arc plate 1 77, so that the intermediate base layer 1 can pass smoothly.

[0067] like Figure 10As shown, the fan-shaped expansion column 28 includes a first straight side plate 47, a second straight side plate 48, a front fan-shaped plate group 51, a rear fan-shaped plate group 52, an upper arc-shaped plate group 49, and a lower arc-shaped plate group 50. The included angle between the extension lines of the first straight side plate 47 and the second straight side plate 48 is α. The front fan-shaped plate group 51 and the rear fan-shaped plate group 52 are disposed on the front and rear sides of the first straight side plate 47 and the second straight side plate 48, respectively. The upper arc-shaped plate group 49 is disposed at the upper end of the first straight side plate 47 and the second straight side plate 48, and the lower arc-shaped plate group 50 is disposed at the lower end of the first straight side plate 47 and the second straight side plate 48. The first straight side plate 47, the second straight side plate 48, the front fan-shaped plate group 51, the rear fan-shaped plate group 52, the upper arc-shaped plate group 49, and the lower arc-shaped plate group 50 form a closed space. It also includes an air supply device (not shown in the figure). The first straight side plate 47 and the second straight side plate 48 can move closer or further apart while maintaining the included angle α. Thus, a certain amount of air is first filled into the enclosed space, so that the first straight side plate 47 and the second straight side plate 48 tend to move away from each other. Under normal circumstances, if there are no wrinkles in the upper surface layer 2 or the lower surface layer 3, the upper surface layer 2 or the lower surface layer 3 can press the fan-shaped expansion column 28 into the fan-shaped receiving groove 27. When there are wrinkles in the upper surface layer 2 or the lower surface layer 3, the pressure on the fan-shaped expansion column 28 becomes smaller, so that the first straight side plate 47 and the second straight side plate 48 move away from each other, so that the fan-shaped expansion column 28 slides out from the fan-shaped receiving groove 27, automatically smoothing the wrinkles of the surface fabric. In addition, in order to avoid wedge self-locking, the included angle α is greater than 12°.

[0068] Furthermore, the upper arc-shaped plate assembly 49 includes a first arc plate 88 and a second arc plate 89, with the second arc plate 89 inserted into the first arc plate 88. The lower arc-shaped plate assembly 50 includes a third arc plate 90 and a fourth arc plate 91, with the third arc plate 90 inserted into the fourth arc plate 91. The second arc plate 89 and the third arc plate 90 are elastic plates, allowing for smooth sliding out while maintaining a good seal. To enhance the sealing effect, the outer side of the upper arc-shaped plate assembly 49 is provided with a first elastic stretch membrane 92, and the inner side with a second elastic stretch membrane 93. The upper side of the lower arc-shaped plate assembly 50 is provided with a third elastic stretch membrane, and the lower side with a fourth elastic stretch membrane 95. The front fan-shaped plate assembly 51 and the rear fan-shaped plate assembly... The shaped plate assemblies 52 have identical structures, each including a first arc-shaped plate 96 and a second arc-shaped plate 97 that can slide relative to each other. An overlapping edge plate is provided on the contact side of the first arc-shaped plate 96 and the second arc-shaped plate 97, thus enabling a seal to be achieved even when the first arc-shaped plate 96 and the second arc-shaped plate 97 move away from each other. This is common knowledge in the art and will not be elaborated further here. A first horizontal guide post 98 is provided on the side of the first arc-shaped plate 96 near the second arc-shaped plate 97, and a second horizontal guide post 99 is provided on the side of the second arc-shaped plate 97 near the first arc-shaped plate 96. Through the first horizontal guide post 98 and the second horizontal guide post 99, the first straight side plate 47 and the second straight side plate 48 can move closer or further apart while maintaining a constant included angle. To ensure airtightness, elastic stretch membranes can be provided on the front and rear fan-shaped plate assemblies.

[0069] In addition, in order to actively correct any misaligned fabric during coating, such as Figures 10-12 As shown, the parallelogram support 44 includes a first short beam 53 and a second short beam 54 that are parallel to each other, and a first straight beam 55 and a second straight beam 56 that are parallel to each other. The two ends of the first short beam 53 are hinged to one end of the first straight beam 55 and one end of the second straight beam 56, respectively. The other end of the first straight beam 55 is hinged to one end of the second short beam 54, and the other end of the second straight beam 56 is hinged to the other end of the second short beam 54. The two ends of the coating roller 43 are hinged between the first straight beam 55 and the second straight beam 56. The first short beam 53 and the coating roller 43 are parallel. The first rotating telescopic frame 45 is disposed on the first short beam 53, and the second rotating telescopic frame 46 is disposed on the second short beam 54. By driving the rotation of the first rotating telescopic frame 45 and / or the second rotating telescopic frame 46, the parallelogram support 44 can be deformed, and the direction of the coating roller 43 can be deflected at a certain angle, thereby correcting the intermediate base layer 1 that has been or is about to be deflected.

[0070] Furthermore, the first short beam 53 and the second short beam 54 have the same structure, both including a column 57 and a left support ear 58 and a right support ear 59 disposed at both ends of the main body 57. The first straight beam 55 and the second straight beam 56 have the same structure, both including a column 60 and a protruding column 61 and a protruding column 62 disposed at both ends of the column 60. The protruding column 61 and / or the protruding column 62 can be inserted into the left support ear 58 and / or the right support ear 59 and are rotatably connected by a pin. Several slots 63 are opened in the column 60, and column holes 64 are vertically opened at the corresponding positions of the slots 63. The coating roller 43 includes a roller body 65 and a rotating shaft 66 that passes through the roller body 65. The rotating shaft 66 is rotatably disposed in the slot 63 through a connecting assembly 67.

[0071] Furthermore, the connecting assembly 67 includes a rotating block 68, with a shaft hole 69 laterally arranged within the rotating block 68. An upper rotating column 70 is arranged at the upper end of the rotating block 68, and a lower rotating column 71 is arranged at the lower end of the rotating block 68. The rotating block 68 is placed into a slot 63, and the second rotating shaft 66 is inserted into the shaft hole 69. The upper rotating column 70 and the lower rotating column 71 are rotatably disposed within the column hole 64. In addition, in order to prevent the first roller body 65 from interfering with the second column 60 when it deflects, a clearance groove 72 is provided on the side of the second column 60 located in the slot 63, closer to the first roller body 65.

[0072] In addition, to accommodate the tilt of the intermediate base layer 1, the upper surface layer 2 and the lower surface layer 3 can also be tilted, specifically as follows: Figure 5 , Figure 8 As shown, the radius of the pressure roller body 19 is R, the radius of the circle containing the center of the arc on the side of the long guide groove 102 near the center O2 is R3, and the radius of the circle containing the center of the arc on the side of the long guide groove 102 away from the center O2 is R2. Therefore, R2>R>R3. Telescopic cylinders (not shown in the figure) are provided at the first outer support circular plate 12 and the second outer support circular plate 13. One end of the telescopic cylinder is located at the center O2, and the other end is located at the end of the coating roller 31. In this way, the coating roller 31 can guide the deviation of the upper surface layer 2 and the lower surface layer 3. For example, the distance from the coating roller 31 on one side to the center O2 can be greater than R, and the distance from the coating roller 31 on the other side to the center O2 can be less than R. In this way, the deviation of the intermediate base layer 1 can be adjusted accordingly.

[0073] Let β11 be the angle between the line connecting the center of the rightmost arc of the guide groove 36 of the pressure roller to the center O2 and the horizontal line. Figure 5As shown, there are five elongated guide grooves 102, but there can be more. The angle between the axis of the elongated guide groove 102 and the center of the rightmost arc of the upper pressure roller guide groove 36 to the center O2 is Ω1. The angles between the axes of adjacent elongated guide grooves 102 are Ω2, Ω3, Ω4 and Ω5, respectively. The angle between the line connecting the center of the rightmost arc of the lower pressure roller guide groove 37 to the center O2 and the horizontal line is β21. The angle between the axis of the elongated guide groove 102 and the center of the rightmost arc of the lower pressure roller guide groove 37 to the center O2 is Ω6. The angles between the axes of adjacent elongated guide grooves 102 are Ω7, Ω8, Ω9 and Ω10, respectively. Ω2=Ω3=Ω4=Ω5=Ω7=Ω8=Ω9=Ω10=Ω.

[0074] The first linkage frame group 32 and the second linkage frame group 33 have the same structure, both composed of several arc-shaped frames 103. Each arc-shaped frame 103 includes an arc-shaped guide groove 105 and an annular body 104. The annular body 104 includes a first inner arc 106, a second outer arc 107, a third arc 108, and a fourth arc 109. The first inner arc 106 and the second outer arc 107 are parallel to each other. The two ends of the third arc 108 are respectively connected to one end of the first inner arc 106 and one end of the second outer arc 107. The two ends of the fourth arc 109 are respectively connected to the other end of the first inner arc 106 and the other end of the second outer arc 107. The radius of the arc-shaped guide groove 105 is r, and its center is O4. The angle between the line connecting the center of the third arc 108 and O4 and the line connecting the center of the fourth arc 109 and O4 is δ3, where δ3 > Ω. Preferably, δ3 = 2Ω or 3Ω. This ensures that the coating roller 31 maintains its arc shape during movement, thereby improving the guiding effect of the upper surface layer 2 and the lower surface layer 3.

[0075] Let γ11 be the angle between the line connecting the center of the leftmost arc of the upper pressure roller guide groove 36 to O2 and the horizontal line, and γ21 be the angle between the line connecting the center of the leftmost arc of the lower pressure roller guide groove 37 to O2 and the horizontal line. Then γ11>γ1, β1>β11, γ21>γ2, β2>β21.

[0076] Preferably, 90° < γ11 < 180° and 0° < β11 < 20°.

[0077] In addition, the sliding of the first upper pressure roller 14, the second upper pressure roller 15, the first lower pressure roller 16 and the second lower pressure roller 17 are all achieved by setting hydraulic telescopic cylinders or telescopic motors at the ends. The specific driving structure is common knowledge in the field and will not be described in detail here.

[0078] Preferably, the coating roller 43 and coating roller 31 have the same structure, both including a roller body and a rotating shaft. The roller body can rotate on the rotating shaft, which is a hollow shaft structure. Slurry is supplied to the rotating shaft through a liquid supply pipe. The slurry is sent into the rotating shaft through a hydraulic pump or other structure. The side of the rotating shaft near the fabric can be provided with many small discharge holes. The slurry flows out from the discharge holes and then passes through the roller body to supply the fabric. The specific structure of the coating roller is common knowledge in the art and is not the focus of this application, so it will not be described in detail.

[0079] like Figure 15 As shown, in order to ensure that the fan-shaped expansion column 28 can slide smoothly in the fan-shaped receiving groove 27, a first guide roller 100 is provided on the first straight side plate 47, and a second guide roller 101 is provided on the second straight side plate 48.

[0080] Preferably, the radii of the upper pressure roller guide groove one, the upper pressure roller guide groove two, the lower pressure roller guide groove one, and the lower pressure roller guide groove two are all R1, and R1>R2.

[0081] Example 2

[0082] like Figure 1 As shown, this application also provides a highly elastic zero-fold microfiber, which includes an upper surface layer 2, an intermediate base layer 1 and a lower surface layer 3 stacked sequentially, wherein the upper surface layer 2, the intermediate base layer 1 and the lower surface layer 3 are formed by pressing together by the intermediate pressing assembly 7.

[0083] To facilitate understanding of the intermediate pressing assembly of this application by those skilled in the art, the working process of the intermediate pressing assembly is described as follows: When pressing of each layer is required, the intermediate base layer 1 passes through the inner guide groove 40 formed by two first mounting grooves 85. Simultaneously, the upper surface layer 2 passes through the first smoothing assembly 20 and the first coating assembly 21 in sequence, and the lower surface layer 3 passes through the second smoothing assembly 22 and the second coating assembly 23 in sequence. When the upper surface layer 2 or the lower surface layer 3 has wrinkles, the fan-shaped expansion column 28 protrudes from the fan-shaped receiving groove 27, thereby smoothing the wrinkles. After smoothing the wrinkles, it enters the coating of the first coating assembly 21 or the second coating assembly 23, and the coating slurry is applied to the surface. Since multiple coating rollers are used for coating, uniform coating can be achieved. Finally, after pressing by the second upper pressure roller 15 and the second lower pressure roller 17, a highly elastic zero-fold microfiber is formed. A skew sensor is set in the inner guide groove 40, such as a camera or infrared sensor. After detecting that the intermediate base layer 1 has skewed, the sensor will... This information is transmitted to the first rotating telescopic frame 45 and the second rotating telescopic frame 46 (the rotating telescopic frame can rotate and extend, and can be configured as a rotating frame structure driven by a hydraulic telescopic cylinder and a motor; the specific structure is not shown in the figure, and is common knowledge in the field, so it will not be described here). The first rotating telescopic frame 45 and / or the second rotating telescopic frame 46 rotate, thereby causing the coating roller 43 to deflect at a certain angle, which can correct the deflection of the intermediate base layer 1. In addition, the deflection information is transmitted to the telescopic cylinders at both ends of the coating roller 31, and the telescopic cylinders also perform corresponding actions in sync, so that the upper surface layer 2, the intermediate base layer 1 and the lower surface layer 3 can be aligned during the stacking. In addition, deflection sensors are also provided on the first outer support circular plate 12 and / or the second outer support circular plate 13. When the upper surface layer 2 and / or the lower surface layer 3 are detected to be deflected, the telescopic cylinders at both ends of the coating roller 31 can be driven, and the telescopic cylinders also perform corresponding telescopic actions in sync to make adjustments, so that the pressed fabric can be neat and wrinkle-free, improving the fabric performance.

[0084] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A process for the production of ultrafine fibers, characterized in that, The steps of the preparation process include: I. Layer preparation: The intermediate base layer (1) of superfine fibers is prepared by using fibers to make non-woven fabric, then immersing the non-woven fabric in a solution containing a mixture of polyester polyurethane and polyether polyurethane, and then reducing the amount of toluene to obtain the intermediate base layer (1). After immersion, a non-woven fabric base cloth containing saturated polyurethane mixed slurry is formed. After the immersed non-woven fabric passes through an aqueous solution of dimethylformamide, the polyurethane is solidified and forms pores to produce a synthetic leather semi-finished product. After further reducing the amount of toluene, the intermediate base layer (1) is obtained. A mixture of polyurethane resin, DMF, color paste and leveling agent is coated on release paper I (10) and heated and dried to form the upper surface layer (2). A mixture of polyurethane resin, DMF, color paste and leveling agent is coated on release paper II (11) and heated and dried to form the lower surface layer (3). The adhesive layer slurry is configured, and polyester polyol and isocyanate prepolymer are mixed as the adhesive layer slurry, or polyurethane resin is used as the adhesive layer slurry. II. Surface layer pressing: The intermediate base layer (1) passes through the intermediate pressing assembly (7) without bending from the middle. The upper surface layer (2) is bent in a first direction to pass through the upper surface of the intermediate pressing assembly (7). The lower surface layer (3) is bent in a second direction to pass through the lower surface of the intermediate pressing assembly (7). After pressing the upper surface layer (2), the intermediate base layer (1) and the lower surface layer (3), a superfine fiber fabric is formed. The directions of the first direction and the second direction are opposite. The intermediate pressing assembly (7) includes a first outer support circular plate (12), a second outer support circular plate (13), an inner pressing assembly (18), and a first upper pressing roller (14), a second upper pressing roller (15), a first lower pressing roller (16) and a second lower pressing roller (17) arranged between the first outer support circular plate (12) and the second outer support circular plate (13). The inner pressing assembly (18) includes a pressing wheel body (19), which is fixedly arranged on the inner side of the first outer support circular plate (12) and the inner side of the second outer support circular plate (13) on the left and right sides of the pressing wheel body (19). The center of the intermediate pressing assembly (7) is O1. The intermediate base layer (1) passes through the center O1 and is arranged horizontally. The upper surface layer (2) is bent around the upper surface of the pressing wheel body (19) after passing through the first upper pressing roller (14), and then is pressed on the upper side of the intermediate base layer (1) after passing through the second upper pressing roller (15). The upper surface layer (2) located between the first upper pressing roller (14) and the second upper pressing roller (15) is the first curved surface layer. The lower surface layer (3) is bent around the lower surface of the pressing wheel body (19) after passing through the first lower pressing roller (16), and then is pressed on the lower side of the intermediate base layer (1) after passing through the second lower pressing roller (17). The lower surface layer (3) located between the first lower pressing roller (16) and the second lower pressing roller (17) is the second curved surface layer. The bending radius of the first curved surface layer is the same as that of the second curved surface layer, and the bending directions are opposite.

2. A process for the production of microfibers according to claim 1, characterized in that: The adhesive layer slurry is provided by the upper surface and lower surface of the intermediate pressing assembly (7) and the interior of the intermediate pressing assembly (7), and is coated on the contact surface of the upper surface layer (2) and the intermediate base layer (1), and on the contact surface of the intermediate base layer (1) and the lower surface layer (3).

3. The process for making microfibers according to claim 1, wherein: The inner pressing assembly (18) further comprises a first smoothing assembly (20), a first coating assembly (21), a second smoothing assembly (22), a second coating assembly (23) and an intermediate coating assembly (24), the first smoothing assembly (20) and the second smoothing assembly (22) are arranged on the pressing wheel body (19), the first coating assembly (21) and the second coating assembly (23) are arranged on the first outer support circular plate (12) and the second outer support circular plate (13), the first smoothing assembly (20) is attached to the proximal end of the first curved surface layer close to the first upper pressing roller (14), the first coating assembly (21) is attached to the distal end of the first curved surface layer close to the second upper pressing roller (15), the second smoothing assembly (22) is attached to the proximal end of the second curved surface layer close to the first lower pressing roller (16), and the second coating assembly (23) is attached to the distal end of the second curved surface layer close to the second lower pressing roller (17), an inner guide groove (40) is formed on the inner side of the pressing wheel body (19), the intermediate coating assembly (24) is arranged in the inner guide groove (40), the first smoothing assembly (20) can smooth the wrinkles on the first curved surface layer, and then the first coating assembly (21) can coat the adhesive layer slurry, the second smoothing assembly (22) can smooth the wrinkles on the second curved surface layer, and then the second coating assembly (23) can coat the adhesive layer slurry, and the intermediate coating assembly (24) can coat the adhesive layer slurry on the upper surface and the lower surface of the intermediate base layer (1).

4. A process for the production of microfibers according to claim 3, characterized in that: The pressing wheel body (19) comprises an intermediate cross handle (25) and a fan-shaped body (26), the intermediate cross handle (25) and the fan-shaped body (26) are separated by a first fan-shaped gap (29) and a second fan-shaped gap (30), a plurality of fan-shaped accommodating grooves (27) are arranged at the two ends of the fan-shaped body (26), the first smoothing assembly (20) and the second smoothing assembly (22) are the same in structure, the first smoothing assembly (20) and the second smoothing assembly (22) each comprise a plurality of fan-shaped expansion cylinders (28), the plurality of fan-shaped expansion cylinders (28) are respectively and slidably arranged in the plurality of fan-shaped accommodating grooves (27), the fan-shaped expansion cylinders (28) are inflated by introducing gas into them, and then slide out of the fan-shaped accommodating grooves (27), so as to smooth the wrinkles on the first curved surface layer or the second curved surface layer, the first coating assembly (21) is arranged in the first fan-shaped gap (29), and the second coating assembly (23) is arranged in the second fan-shaped gap (30).

5. A process for the production of microfibers according to claim 4, characterized in that: The fan-shaped expansion column (28) comprises a first straight side plate (47), a second straight side plate (48), a front fan-shaped plate group (51), a rear fan-shaped plate group (52), an upper arc-shaped plate group (49) and a lower arc-shaped plate group (50), the included angle of the extensions of the first straight side plate (47) and the second straight side plate (48) is α, the front fan-shaped plate group (51) and the rear fan-shaped plate group (52) are arranged on the front side and the rear side of the first straight side plate (47) and the second straight side plate (48), the upper arc-shaped plate group (49) is arranged on the upper end of the first straight side plate (47) and the second straight side plate (48), the lower arc-shaped plate group (50) is arranged on the lower end of the first straight side plate (47) and the second straight side plate (48), a closed space is formed by the first straight side plate (47), the second straight side plate (48), the front fan-shaped plate group (51), the rear fan-shaped plate group (52), the upper arc-shaped plate group (49) and the lower arc-shaped plate group (50), and the first straight side plate (47) and the second straight side plate (48) can approach or move away from each other while keeping the included angle α unchanged.

6. The process for making microfibers according to claim 3, wherein: The first coating assembly (21) and the second coating assembly (23) are the same in structure, and each comprises a plurality of coating rollers (31), a first linkage frame group (32) and a second linkage frame group (33) arranged on both sides of the plurality of coating rollers (31), and the two sides of the plurality of coating rollers (31) are respectively slidably arranged on the first outer support circular plate (12) and the second outer support circular plate (13). Two groups of first guide groove groups (34) are arranged on the first outer support circular plate (12), and two groups of second guide groove groups (35) are arranged on the second outer support circular plate (13). The first guide groove groups (34) and the second guide groove groups (35) are the same in structure and each comprises a plurality of long strip guide grooves (102). An upper pressure roller guide groove one (36) is arranged above the first outer support circular plate (12), and a lower pressure roller guide groove one (37) is arranged below the first outer support circular plate (12). An upper pressure roller guide groove two (38) is arranged above the second outer support circular plate (13), and a lower pressure roller guide groove two (39) is arranged below the second outer support circular plate (13). The two ends of the first upper pressure roller (14) and the second upper pressure roller (15) are arranged in the upper pressure roller guide groove one (36) and the upper pressure roller guide groove two (38) respectively. The first lower pressure roller (16) and the second lower pressure roller (17) are arranged in the lower pressure roller guide groove one (37) and the lower pressure roller guide groove two (39) respectively. The axis of the long strip guide groove (102) passes through the center O2 of the first outer support circular plate (12), and the spacing between the plurality of long strip guide grooves (102) of the first guide groove group (34) or the second guide groove group (35) is the same.

7. A process for the production of microfibers according to claim 6, characterized in that: The radius of the pressure roller body (19) is R, the radius of the circle where the center of the circular arc of the long guide groove (102) near the side of the center O2 is located is R3, the radius of the circle where the center of the circular arc of the long guide groove (102) away from the side of the center O2 is located is R2, then R2>R>R3, a telescopic cylinder is arranged at the first outer supporting circular plate (12) and the second outer supporting circular plate (13), one end of the telescopic cylinder is arranged at the center O2, and the other end is arranged at the end of the coating roller one (31), so that the coating roller one (31) can correct and guide the deflection of the upper surface layer (2) and the lower surface layer (3) above.

8. The process of claim 3 wherein: The intermediate coating assembly (24) comprises a third coating assembly (41) arranged above the inner guide groove (40) and a fourth coating assembly (42) arranged below the inner guide groove (40), the third coating assembly (41) and the fourth coating assembly (42) are the same in structure, and each comprises a parallelogram support (44), a coating roller two (43), a first rotary telescopic frame (45) and a second rotary telescopic frame (46), the coating roller two (43) is arranged in the parallelogram support (44), one end of the first rotary telescopic frame (45) and one end of the second rotary telescopic frame (46) are arranged on the parallelogram support (44), and the other end of the first rotary telescopic frame (45) and the other end of the second rotary telescopic frame (46) are arranged on the pressure roller body (19).

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