Superfine fiber preparation process and high-elasticity zero-folding superfine fiber

Abstract

The invention relates to a superfine fiber preparation process and a high-elasticity zero-folding superfine fiber, and belongs to the technical field of lamination processes of layered products, in the preparation process, surface layers are attached to the upper end and the lower end of a middle base layer, the middle base layer is in a straight state during lamination, the bending of the upper surface layer and the bending of the lower surface layer are just opposite, and the surface layers are not prone to deformation. In addition, the middle base layer is impregnated with a mixed solution of polyester type polyurethane and polyether type polyurethane, so that the base cloth has a better anti-fracture effect, in addition, when the superfine fibers are laminated, the problem that the surfaces of the upper surface layer and the lower surface layer are wrinkled when the upper surface layer and the lower surface layer are attached is considered, and the anti-fracture effect of the base cloth is improved. A fan-shaped expansion cylinder structure is adopted as the smoothing device, when wrinkles exist on the surface layer, fan-shaped expansion cylinders can actively protrude, so that the wrinkles can be smoothed, the top surfaces of the fan-shaped expansion cylinders are soft layers, the fabric can be well protected, and finally the performance of the formed fabric is excellent.

Description

Technical Field

[0001] The invention relates to the technical field of lamination technology for layered products, and in particular to a superfine fiber preparation process and a high-elasticity zero-fold superfine fiber. Background Art

[0002] The existing ultrafine fibers are obtained by surface treating non-woven fabrics. In order to enhance the functionality of ultrafine fibers in bending resistance and maintaining a crease-free appearance during production, an anti-wrinkle modifier is generally added to the ultrafine fibers. Also, a polyurethane layer provided on a release paper is generally attached to the surface of the non-woven fabric, generally in a two-layer laminated structure, so that the ultrafine fibers are not easily creased on the surface after being bent. In the prior art, such as patent document 1 (CN114889296A), it discloses an environmentally friendly synthetic leather with crease resistance. The synthetic leather has multiple layers including an anti-folding surface layer, an anti-folding soft layer, an anti-folding base layer, an anti-folding soft layer and an anti-folding surface layer, which are arranged in sequence from the outer side to the inner side. The fiber filaments are processed to form a degradable base fabric, and finally the pre-treated anti-folding base fabric is obtained by impregnation treatment. The two anti-folding soft layers are then pressed together under pressure to obtain a composite layer, and finally an anti-folding glue solution is applied on the surface of the composite layer to obtain an environmentally friendly synthetic leather. Although the number of crease resistance of the obtained synthetic leather is significantly increased, it does not disclose how to press the anti-folding soft layer onto the anti-folding base layer. There are defects such as uneven glue coating of the anti-folding soft layer and wrinkles in the finished product due to insufficient stretching during pressing, which ultimately affects the quality of the finished synthetic leather. Further, in the prior art, such as patent document 2 (CN117183547A), it discloses a production equipment for composite non-woven fabrics. and production process, in which a suction and stretching device is arranged between the upper hot-melt cloth and the lower hot-melt cloth, and the suction and stretching device automatically unfolds the wrinkles of the upper hot-melt cloth and the lower hot-melt cloth by wind force through generating a suction airflow, and then presses them together through an adaptive hot-melt pressing device, so that the formed non-woven fabric will not have wrinkles, thereby improving the quality of the non-woven fabric. Although the above-mentioned suction and stretching device can smooth out the wrinkles, it is achieved through the action of negative pressure. If glue needs to be applied between the two mutually pressed fabrics, the suction and stretching device will also attract the glue into the device, which not only affects the pressing of the fabrics, but may also damage the internal structure of the suction and stretching device, thereby limiting its scope of use to a certain extent. In addition, the suction and stretching device is also only suitable for the flattening operation of two layers of non-woven fabrics. When the flattening operation of three layers of non-woven fabrics needs to be performed, only two suction and stretching devices can be used to smooth the wrinkles of the three layers of non-woven fabrics. In addition, when the non-woven fabric is offset, it cannot be corrected.

[0003] In summary, in the prior art, for multi-layer fiber cloths, a polyurethane layer has been laminated to the fiber surface layer to avoid creases on the fiber surface after bending. However, although a stretching device is used to solve the wrinkle problem of the surface laminating layer, negative pressure is used to stretch the wrinkles, which is not suitable for laminating cloth layers that require adhesives to be added between the layers. Moreover, when laminating, it does not take into account that the different bending degrees of the upper and lower outer surface layers will also affect the performance of the formed cloth, and does not take into account the formation of wrinkles due to deviation of the cloth during transportation. Therefore, the present invention provides a superfine fiber preparation process and a high-elasticity zero-fold superfine fiber that can stretch the laminating layer without using negative pressure, can ensure that the middle layer is in a straight state for lamination, and the upper and lower surface layers have the same degree of deformation, and can correct the surface layer in time when it is deflected. 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 steps of which include:

[0005] 1. Layer preparation:

[0006] A non-woven fabric is made from fibers. The non-woven fabric is impregnated with an impregnation liquid and then subjected to a reduction treatment to obtain an intermediate base layer of ultrafine fibers. The impregnation liquid is a mixture of polyester polyurethane and polyether polyurethane. After impregnation, a non-woven fabric base fabric containing a saturated polyurethane mixed slurry is formed. The impregnated non-woven fabric passes through an aqueous solution of dimethylformamide to solidify the polyurethane and form pores to obtain a synthetic leather semi-finished product. After a reduction treatment with toluene, an intermediate base layer is obtained. A polyurethane resin, DMF, a color paste and a leveling agent mixture are coated on a first release paper, and the mixture is heated and dried to form an upper surface layer. A polyurethane resin, DMF, a color paste and a leveling agent mixture are coated on a second release paper, and the mixture is heated and dried to form a lower surface layer. An adhesive layer slurry is prepared, and a polyester polyol and an isocyanate prepolymer are mixed as the adhesive layer slurry, or a polyurethane resin is used as the adhesive layer slurry.

[0007] 2. Surface layer lamination:

[0008] The middle base layer passes through the middle laminating assembly without being bent, the upper surface layer is bent in a first direction to pass through the upper surface of the middle laminating assembly, and the lower surface layer is bent in a second direction to pass through the lower surface of the middle laminating assembly. The upper surface layer, the middle base layer and the lower surface layer are laminated to form a microfiber cloth, and the first direction and the second direction are opposite.

[0009] Preferably, the adhesive layer slurry is provided through the upper and lower surfaces of the intermediate pressing component and the interior of the intermediate pressing component, 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 supporting circular plate, a second outer supporting circular plate, an inner pressing assembly, and a first upper pressing roller, a second upper pressing roller, a first lower pressing roller, and a second lower pressing roller arranged between the first outer supporting circular plate and the second outer supporting circular plate. The inner pressing assembly includes a pressing wheel body, and the left and right sides of the pressing wheel body are respectively fixedly arranged on the inner side of the first outer supporting circular plate and the inner side of the second outer supporting circular plate. The center of the intermediate pressing assembly is O1, and the intermediate base layer passes through the center of the circle O1 and is arranged horizontally. The upper surface layer passes through the first upper pressing roller and then bends The upper surface of the pressing wheel body is curved and wound, and then pressed onto the upper side of the intermediate base layer after passing through the second upper pressing roller. The upper surface layer between the first upper pressing roller and the second upper pressing roller is referred to as the first curved surface layer. The lower surface layer is curved and wound on the lower surface of the pressing wheel body after passing through the first lower pressing roller, and then pressed onto the lower side of the intermediate base layer after passing through the second lower pressing roller. The lower surface layer between the first lower pressing roller and the second lower pressing roller is referred to as the second curved surface layer. The curvature of the first curved surface layer is the same as that of the second curved surface layer, and the bending directions are opposite.

[0011] Preferably, the inner pressing assembly further comprises a first smoothing assembly, a first coating assembly, a second smoothing assembly, a second coating assembly and an intermediate coating assembly, the first smoothing assembly and the second smoothing assembly are arranged on the pressing wheel body, the first coating assembly and the second coating assembly are arranged on the first outer supporting circular plate and the second outer supporting circular plate, the first smoothing assembly is attached to the proximal end of the first curved surface layer close to the first upper pressing roller, the first coating assembly is attached to the distal end of the first curved surface layer close to the second upper pressing roller, the second smoothing assembly is attached to the proximal end of the second curved surface layer close to the first lower pressing roller end, the second coating component is attached to the far end of the second curved surface layer close to the second lower pressure roller, an inner guide groove is opened on the inner side of the pressure wheel body, the intermediate coating component is arranged 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 coats the adhesive layer slurry, the second smoothing component can smooth the wrinkles on the second curved surface layer, and then the second coating component coats the adhesive layer slurry, and the intermediate coating component can coat the upper surface and the lower surface of the intermediate base layer with the adhesive layer slurry.

[0012] Preferably, the pressure wheel body includes a middle horizontal handle and a fan-shaped body, and the middle horizontal handle and the fan-shaped body are separated by fan-shaped notch 1 and fan-shaped notch 2. A plurality of fan-shaped accommodating grooves are respectively arranged at the two ends of the fan-shaped body. The first smoothing component and the second smoothing component have the same structure. The first smoothing component and the second smoothing component both include a plurality of fan-shaped expansion cylinders, which are respectively slidably arranged in the plurality of fan-shaped accommodating grooves. Gas is introduced into the fan-shaped expansion cylinders to expand them and slide out of the fan-shaped accommodating 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 1, and the second coating component is arranged in the fan-shaped notch 2.

[0013] Preferably, the fan-shaped expansion column includes a first straight side panel, a second straight side panel, a front fan-shaped panel group, a rear fan-shaped panel group, an upper arc-shaped panel group and a lower arc-shaped panel group, the angle between the extension lines of the first straight side panel and the second straight side panel is α, the front fan-shaped panel group and the rear fan-shaped panel group are arranged on the front and rear sides of the first straight side panel and the second straight side panel, the upper arc-shaped panel group is arranged on the upper ends of the first straight side panel and the second straight side panel, and the lower arc-shaped panel group is arranged on the lower ends of the first straight side panel and the second straight side panel, and a closed space is formed by the first straight side panel, the second straight side panel, the front fan-shaped panel group, the rear fan-shaped panel group, the upper arc-shaped panel group and the lower arc-shaped panel group, and the first straight side panel and the second straight side panel can approach or move away from each other while keeping the angle α unchanged.

[0014] Preferably, the first coating assembly and the second coating assembly have the same structure, both comprising a plurality of coating rollers, a first linkage frame group and a second linkage frame group arranged on both sides of the plurality of coating rollers, the two sides of the plurality of coating rollers are slidably arranged on the first outer supporting circular plate and the second outer supporting circular plate respectively, two groups of first guide groove groups are arranged on the first outer supporting circular plate, and two groups of second guide groove groups are arranged on the second outer supporting circular plate, the first guide groove group and the second guide groove group have the same structure, both consisting of a plurality of long guide grooves, and an upper 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 the second outer supporting circular plate, and a lower pressure roller guide groove 2 is provided below, the first upper pressure roller and the second upper pressure roller are respectively provided at both ends in the upper pressure roller guide groove 1 and the upper pressure roller guide groove 2, the first lower pressure roller and the second lower pressure roller are respectively provided in the lower pressure roller guide groove 1 and the lower pressure roller guide groove 2, the center of the first outer supporting circular plate is denoted as O2, then the axis of the long guide groove passes through the center of the circle O2, and the spacing between the several 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 wheel body is R, the radius of the circle where 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 where the center of the arc on the side of the long guide groove away from the center O2 is R2, then R2>R>R3, and a telescopic cylinder is provided at the first outer supporting circular plate and the second outer supporting circular plate, one end of the telescopic cylinder is provided at the center O2, and the other end is provided at the end of the coating roller one, so that the coating roller one can correct and guide the deviation of the upper surface layer and the lower surface layer above.

[0016] Preferably, the intermediate coating assembly includes a third coating assembly respectively arranged above the inner guide groove and a fourth coating assembly below the inner guide groove, the third coating assembly and the fourth coating assembly have the same structure, and both include a parallelogram bracket, a second coating roller, a first rotating telescopic frame and a second rotating telescopic frame, the second coating roller is arranged in the parallelogram bracket, one end of the first rotating telescopic frame and one end of the second rotating telescopic frame are arranged on the parallelogram bracket, and the other end of the first rotating telescopic frame and the other end of the second rotating telescopic frame are both arranged on the pressure wheel body.

[0017] It also includes a high-elasticity zero-fold ultrafine fiber, which includes an upper surface layer, an intermediate base layer and a lower surface layer stacked in sequence, and is characterized in that the high-elasticity zero-fold ultrafine fiber is made by the ultrafine fiber 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 ultrafine fiber preparation process of the present invention, the surface layer is attached to the upper and lower ends of the intermediate base layer, and the intermediate base layer is in a straight state during lamination, and the bending of the upper surface layer and the lower surface layer is just opposite, so that the stress inside the pressed fabric can be changed. In addition, the intermediate base layer is impregnated with a mixed liquid of polyester polyurethane and polyether polyurethane, which can make the base fabric have better anti-bending effect. In addition, since the resin layer is attached to the intermediate base layer, the anti-bending effect is good;

[0020] 2. When applying the upper and lower surface layers of the present invention, wrinkles on the surface are taken into consideration, and the wrinkle smoothing operation and the glue coating operation are separated, so as to ensure the smooth pressing of the base fabric. The smoothing device of the present application adopts a fan-shaped expansion column structure. When wrinkles exist in the surface layer, the fan-shaped expansion column can actively protrude, so as to smooth the wrinkles. Moreover, the top surface of the fan-shaped expansion column is a soft layer, which can well protect the fabric. Moreover, the expansion gas is used for smoothing, which can achieve a better smoothing effect. In addition, the rotation speed between the pressure rollers can be adjusted, so as 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 being able to perform coating operations, the coating assembly of the present invention can also change the axial direction of the coating roller, so that while coating, the fabric can also be corrected in time after being offset, without the need to add additional correction devices, which can save installation space.

[0021] 3. The intermediate coating assembly of the present invention adapts to the working environment in which the intermediate base layer is transmitted straightly, and is arranged as a parallelogram bracket structure. By rotating the coating roller and setting it on the parallelogram bracket, the purpose of deviation correction can be achieved well and quickly by operating the rotation angle of the parallelogram bracket. In addition, the first rotating telescopic frame and the second rotating telescopic frame arranged on the parallelogram bracket can not only rotate, but also telescope, so as to adjust the gap between the coating rollers, and can press and smooth the wrinkles of the intermediate base layer when there are wrinkles. A fan-shaped notch is provided on the pressing wheel body, so that the first coating assembly and the second coating assembly can be slidably arranged in the first outer supporting circular plate and the second outer supporting circular plate. A guide groove group is provided on the first outer supporting circular plate and the second outer supporting circular plate, and the guide groove group is composed of a plurality of long guide grooves, so that the distance between the left end of the coating roller and the center of the circle and the distance between the right end and the center of the circle can be flexibly controlled to be different, so as to adaptively correct the fabric layer;

[0022] 4. The fan-shaped expansion column of the present invention uses an air bag for expansion operation, and when expanding and deforming, the first straight plate and the second straight plate are moved away from or close to each other at a constant angle. Such an arrangement can make the telescopic activity of the fan-shaped expansion column controllable, and there will be no situation in which the side plate and the middle partition plate in the fan-shaped receiving groove are stuck in the fan-shaped receiving groove due to angle mismatch after collision and deformation due to the uncontrollable deformation of the upper arc plate group and the lower arc plate group when the fan-shaped column is deformed. This can better achieve the purpose of smoothing out the wrinkles of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a cross-sectional view of the high elastic zero-fold ultrafine fiber of the present application;

[0024] Figure 2Schematic diagram of the preparation of the surface layer and the lamination of the surface layer of the ultrafine fiber;

[0025] Figure 3 It is an exploded view of the middle press-fit assembly;

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

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

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

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

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

[0031] Figure 7 (a) is a schematic structural diagram of a pressure wheel body;

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

[0033] Figure 7 (c) is a schematic diagram of the cross-sectional structure of the pressure wheel body;

[0034] Figure 8-9 It is a schematic diagram of the structure of the intermediate pressing assembly without showing the upper surface layer and part of the pressing wheel body;

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

[0036] Fig.10 (b) a schematic diagram of the structure of the front fan-shaped plate group or the rear fan-shaped plate group;

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

[0038] Fig.14 (a) is a schematic structural diagram of an upper pressing wheel body or a lower pressing wheel body;

[0039] Fig.14 (b) is another schematic diagram of the structure of the upper pressing wheel body or the lower pressing wheel body;

[0040] Fig.14 (c) is a schematic diagram of the bottom structure of the upper pressing wheel body or the lower pressing wheel body;

[0041] Fig.14 (d) Fig.14 (c) Schematic diagram of the cross-sectional structure;

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

[0043] Fig.16 (a) is a schematic diagram of the structure of the arc frame;

[0044] Fig.16 (b) is a schematic diagram of the structure of the annular body.

[0045] Among them, 1. middle base layer; 2. upper surface layer; 3. lower surface layer; 4. unwinding roller 1; 5. unwinding roller 2; 6. unwinding roller 3; 7. middle pressing assembly; 8. winding roller 1; 9. winding roller 2; 10. release paper 1; 11. release paper 2; 12. first outer supporting circular plate; 13. second outer supporting circular plate; 14. first upper pressing roller; 15. second upper pressing roller; 16. first lower pressing roller; 17. second lower pressing roller; 18. inner pressing assembly; 19. pressing wheel body; 20. first smoothing assembly; 21. first coating assembly; 22. second smoothing assembly; 23. second coating assembly; 24. middle coating assembly; 25. middle horizontal handle; 26. fan-shaped body; 27. fan-shaped receiving groove; 28. Sector-shaped expansion column; 29. ​​Sector-shaped notch 1; 30. Sector-shaped notch 2; 31. Coating roller 1; 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 1; 37. Lower pressure roller guide groove 1; 38. Upper pressure roller guide groove 2; 39. Lower pressure roller guide groove 2; 40. Inner guide groove; 41. Third coating assembly; 42. Fourth coating assembly; 43. Coating roller 2; 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 sector plate group; 5 2. Rear fan-shaped plate group; 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. Boss one; 62. Boss 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. Avoidance groove; 74. Lower pressure wheel body; 75. First side plate; 76. Second side plate; 77. Arc plate one; 78. Oblique side plate; 79. Arc plate two; 80. Upper side plate; 81. Lower side plate; 82. Middle partition plate; 83. First mounting hole; 84. Two mounting holes; 85, first mounting slot; 86, first through slot; 87, second through slot; 88, first arc plate; 89, second arc plate; 90, third arc plate; 91, fourth arc plate; 92, first elastic telescopic membrane; 93, second elastic telescopic membrane; 94, third elastic telescopic membrane; 95, fourth elastic telescopic membrane; 96, first arc plate; 97, second arc plate; 98, first horizontal guide column; 99, second horizontal guide column; 100, first guide roller; 101, second guide roller; 102, long guide groove; 103, arc frame; 104, annular body; 105, arc guide groove; 106, first inner arc; 107, second outer arc; 108, third circular arc; 109, fourth circular arc. DETAILED DESCRIPTION

[0046] The present invention is further described below in conjunction with the examples. However, the present invention is not limited to the following examples. The implementation conditions used in the examples can be further adjusted according to the different requirements of specific use, and the implementation conditions not specified are conventional conditions in the industry. The technical features involved in each embodiment 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 are described in detail below with reference to the accompanying drawings.

[0048] Example 1

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

[0050] 1. Layer preparation:

[0051] A non-woven fabric is made from fibers. The non-woven fabric is impregnated with an impregnation liquid and then subjected to a reduction treatment to obtain an intermediate base layer 1 of ultrafine fibers. The impregnation liquid may be a mixed solution of a polyester polyurethane of model TD5070 and a polyether polyurethane of model TDW18ET. After impregnation, a non-woven fabric base fabric containing a saturated polyurethane mixed slurry is formed. The impregnated non-woven fabric passes through an aqueous solution of a certain concentration of dimethylformamide at a certain temperature to solidify the polyurethane and form pores, thereby obtaining a synthetic leather semi-finished product. After a reduction treatment with toluene at a certain temperature, an intermediate base layer 1 is obtained, and the intermediate base layer 1 can be wound onto a discharge roller 4;

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

[0053] A certain amount of polyurethane resin, DMF, color paste and leveling agent mixture is coated on the release paper 11, and the mixture is heated and dried at a certain temperature to form a lower surface layer 3, and the lower surface layer 3 can be wound into the unwinding roller 6 for storage;

[0054] Prepare adhesive layer slurry by mixing a certain amount of polyester polyol and isocyanate prepolymer, or directly use polyurethane resin as adhesive layer slurry;

[0055] 2. Surface layer lamination:

[0056] The middle base layer 1 passes through the middle pressing component 7 without being bent, the upper surface layer 2 is bent in a first direction to pass through the upper surface of the middle pressing component 7, and the lower surface layer 3 is bent in a second direction to pass through the lower surface of the middle pressing component 7. The upper surface layer 2, the middle base layer 1 and the lower surface layer 3 are pressed together to form a microfiber cloth, and the first direction and the second direction are opposite, such as the first direction is downward and the second direction is upward.

[0057] In addition, the adhesive layer slurry can be provided through the upper and lower surfaces of the intermediate pressing component 7 and the interior of the intermediate pressing component 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 supporting circular plate 12, a second outer supporting 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 supporting circular plate 12 and the second outer supporting circular plate 13. The inner pressing assembly 18 includes a pressing wheel body 19. The left and right sides of the pressing wheel body 19 are respectively fixedly arranged on the inner side of the first outer supporting circular plate 12 and the inner side of the second outer supporting circular plate 13. The center of the intermediate pressing assembly 7 is O1, and the intermediate base layer 1 passes through the center of the circle O1 and is arranged horizontally. The upper surface layer 2 passes through the first upper pressing roller 14 and the second upper pressing roller 15. The roller 14 is bent and wrapped around the upper surface of the pressing wheel body 19, and then passed through the second upper pressing roller 15 and pressed onto the upper side of the intermediate base layer 1. The upper surface layer 2 located between the first upper pressing roller 14 and the second upper pressing roller 15 is recorded as the first bent surface layer, and the lower surface layer 3 is bent and wrapped around the lower surface of the pressing wheel body 19 after passing through the first lower pressing roller 16, and then passed through the second lower pressing roller 17 and pressed onto the lower side of the intermediate base layer 1. The lower surface layer 3 located between the first lower pressing roller 16 and the second lower pressing roller 17 is recorded as the second bent surface layer. The curvature of the first curved surface layer is the same as that of the second curved surface layer, and the bending directions are opposite.

[0059] Let the angle between the axis center of the first upper pressure roller 14 and the center O1 and the horizontal line be γ1, the angle between the axis center of the second upper pressure roller 15 and the center O1 and the horizontal line be β1, the angle between the axis center of the first lower pressure roller 16 and the center O1 and the horizontal line be γ2, and the angle between the axis center of the second lower pressure roller 17 and the center O1 and the horizontal line be β2. 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 winding roller 1 8 and a winding roller 2 9. The release paper 10 on the unwinding roller 2 5 is wound on the winding roller 1 8 after passing through the first guide wheel, and the release paper 2 11 on the unwinding roller 3 6 is wound on the winding roller 2 9 after passing through the second guide wheel. In order to make the arrangement structure compact, the center of the unwinding roller 2 5, the center of the winding roller 1 8, the center of the winding roller 2 9 and the center of the unwinding roller 3 6 all pass through the arc with O1 as the center, and the unwinding roller 2 5 and the winding roller 1 8 are symmetrical with the unwinding roller 3 6 and the winding roller 2 9 about the horizontal line passing through the center O1.

[0061] like Figure 3-Figure 6 As shown, the inner pressing assembly 18 also 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 arranged on the pressing wheel body 19, the first coating assembly 21 and the second coating assembly 23 are arranged on the first outer supporting circular plate 12 and the second outer supporting 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, and the second smoothing assembly 22 is attached to the second curved surface layer close to the first lower pressing roller 16. 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 close to the second lower pressure roller 17, an inner guide groove 40 is opened on the inner side of the pressure wheel body 19, the intermediate coating component 24 is arranged 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 the adhesive layer slurry, the second smoothing component 22 can smooth the wrinkles on the second curved surface layer, and then the second coating component 23 applies the adhesive layer slurry, the intermediate coating component 24 can apply the adhesive layer 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 wheel 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 2 30. A plurality of fan-shaped receiving grooves 27 are respectively arranged at the two ends of the fan-shaped body 26. The first smoothing component 20 and the second smoothing component 22 both include a plurality of fan-shaped expansion columns 28. The plurality of fan-shaped expansion columns 28 are respectively slidably arranged in the plurality of fan-shaped receiving grooves 27. Gas is introduced into the fan-shaped expansion columns 28 to expand them and slide out of 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 2 30.

[0063] The first coating assembly 21 and the second coating assembly 23 have the same structure. Figure 5-Figure 9 As shown, they all include 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, the two sides of the plurality of coating rollers 31 are slidably arranged on the first outer supporting circular plate 12 and the second outer supporting circular plate 13, two groups of first guide groove groups 34 are arranged on the first outer supporting circular plate 12, and two groups of second guide groove groups 35 are arranged on the second outer supporting circular plate 13. The first guide groove group 34 and the second guide groove group 35 have the same structure and are both composed of a plurality of long guide grooves 102. An upper pressure roller guide groove 36 is arranged above the first outer supporting circular plate 12, and a lower pressure roller guide groove 37 is arranged below. A pressure roller guide groove 1 37, an upper pressure roller guide groove 2 38 is arranged above the second outer supporting circular plate 13, and a lower pressure roller guide groove 2 39 is arranged below, the first upper pressure roller 14 and the second upper pressure roller 15 are arranged at both ends in the upper pressure roller guide groove 1 36 and the upper pressure roller guide groove 2 38 respectively, the first lower pressure roller 16 and the second lower pressure roller 17 are arranged in the lower pressure roller guide groove 1 37 and the lower pressure roller guide groove 2 39 respectively, let the center of the first outer supporting circular plate 12 be O2, then the axis of the long guide groove 102 passes through the center of the circle O2, and the spacing between the several long guide grooves 102 of the first guide groove group 34 or the second guide groove group 35 is the same.

[0064] like Figure 3 , Figure 11-13 As shown, the intermediate coating assembly 24 includes a third coating assembly 41 respectively arranged above the inner guide groove 40 and a fourth coating assembly 42 below the inner guide groove 40, the third coating assembly 41 and the fourth coating assembly 42 have the same structure, both including a parallelogram bracket 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 arranged in the parallelogram bracket 44, one end of the first rotating telescopic frame 45 and one end of the second rotating telescopic frame 46 are arranged on the parallelogram bracket 44, and the other end of the first rotating telescopic frame 45 and the other end of the second rotating telescopic frame 46 are both arranged on the pressure wheel body 19.

[0065] In addition, in order to facilitate the installation of the intermediate coating assembly 24, the pressing wheel body 19 includes an upper pressing wheel body and a lower pressing wheel body 74, and the upper pressing wheel body and the lower pressing wheel body 74 have the same structure. Fig.14As shown, the upper pressure wheel body includes a first side plate 75, a second side plate 76, an arc plate 1 77, an oblique side plate 78, an upper side plate 80, an arc plate 2 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 front and back. Between the first side plate 75 and the second side plate 76, there are arranged a lower side plate 81, an arc plate 2 79, an upper side plate 80, an oblique side plate 78, a middle partition plate 82 and an arc plate 1 77 from bottom to top. There are a plurality of middle partition plates 82. The oblique side plates 78, the first side plates 75 and the second side plates 76 are arranged parallel to each other front and back. , the second side plate and a plurality of middle partition plates 82 together form the fan-shaped accommodating groove 27, and the first mounting groove 85 is formed by the first side plate 75, the second side plate 76, the arc plate 2 79, the arc plate 1 77 and the lower side plate 81, and the third coating component 41 and the fourth coating component 42 are installed in the first mounting groove 85, and the first mounting hole 83 and the second mounting hole 84 are respectively provided on the lower side plate 81, and the first rotating telescopic frame 45 and the second rotating telescopic frame 46 are respectively installed in the first mounting hole 83 and the second mounting hole 84.

[0066] A second through groove 87 and a first through groove 86 are respectively formed on the second arc plate 79 and the first arc plate 77 at the first mounting groove 85 to allow the intermediate base layer 1 to pass smoothly.

[0067] like Fig.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 plate group 49 and a lower arc plate group 50, the 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 arranged on the front and rear sides of the first straight side plate 47 and the second straight side plate 48, the upper arc plate group 49 is arranged on the upper end of the first straight side plate 47 and the second straight side plate 48, and the lower arc plate group 50 is arranged on the lower end of the first straight side plate 47 and the second straight side plate 48, and 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 plate group 49 and the lower arc plate group 50, and 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 to or farther away from each other while keeping the angle α unchanged. In this way, a certain amount of air is first filled into the closed space so that the first straight side plate 47 and the second straight side plate 48 have a tendency to move away from each other. Under normal circumstances, if there are no wrinkles on 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 on 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 of the fan-shaped receiving groove 27, and the wrinkles on the surface fabric are automatically smoothed. In addition, in order to avoid wedge self-locking, the angle α is made greater than 12°.

[0068] Further, the upper arc plate group 49 includes a first arc plate 88 and a second arc plate 89, the second arc plate 89 is inserted into the first arc plate 88, the lower arc plate group 50 includes a third arc plate 90 and a fourth arc plate 91, the third arc plate 90 is inserted into the fourth arc plate 91, and the second arc plate 89 and the third arc plate 90 are elastic plates, so that they can slide out smoothly when sliding out, and can be well sealed. In order to increase the sealing effect, the outer side of the upper arc plate group 49 is provided with a first elastic telescopic membrane 92, and the inner side is provided with a second elastic telescopic membrane 93, the upper side of the lower arc plate group 50 is provided with a third elastic telescopic membrane, and the lower side is provided with a fourth elastic telescopic membrane 95, the front fan plate group 51 and the rear fan The plate group 52 has the same structure, and both include a first curved plate 96 and a second curved plate 97 that can slide relative to each other. An overlapping side plate is provided on the contact side of the first curved plate 96 and the second curved plate 97, so that the first curved plate 96 and the second curved plate 97 can still be sealed after they move away from each other. This is common knowledge in the art and will not be repeated here. A first horizontal guide column 98 is provided on the side of the first curved plate 96 close to the second curved plate 97, and a second horizontal guide column 99 is provided on the side of the second curved plate 97 close to the first curved plate 96. Through the first horizontal guide column 98 and the second horizontal guide column 99, the first straight side plate 47 and the second straight side plate 48 can move closer to or away from each other without changing the angle. In order to ensure airtightness, an elastic telescopic membrane can be provided on the front fan plate group and the rear fan plate group.

[0069] In addition, in order to be able to actively correct the deviated fabric during coating, such as Figure 10-12 As shown, the parallelogram bracket 44 includes a first short beam 53 and a second short beam 54 which are parallel to each other, and a first straight beam 55 and a second straight beam 56 which 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 2 43 are hingedly arranged between the first straight beam 55 and the second straight beam 56. The first short beam 53 is parallel to the coating roller 2 43. The first rotating telescopic frame 45 is arranged on the first short beam 53, and the second rotating telescopic frame 46 is arranged on the second short beam 54. By driving the first rotating telescopic frame 45 and / or the second rotating telescopic frame 46 to rotate, the parallelogram bracket 44 can be deformed, and the direction of the coating roller 2 43 can be deflected at a certain angle, so that the intermediate base layer 1 that has been or is about to be deflected can be corrected.

[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 arranged 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, a convex column 61 and a convex column 62 arranged at both ends of the column 60. The convex column 61 and / or the convex 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 shaft. A plurality of slots 63 are opened in the column 60, and column holes 64 are vertically opened at positions corresponding to the slots 63. The coating roller 43 includes a roller main body 65 and a rotating shaft 66 that passes through the roller main body 65. The rotating shaft 66 is rotatably set in the slot 63 through a connecting component 67.

[0071] Furthermore, the connecting assembly 67 includes a rotating block 68, in which an axial hole 69 is transversely arranged, 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 in the slot hole 63, the second rotating shaft 66 is inserted into the axial hole 69, and the upper rotating column 70 and the lower rotating column 71 are rotatably arranged in the column hole 64. In addition, in order to prevent the roller body 1 65 from interfering with the column body 2 60 when deflecting, an avoidance groove 72 is opened on the side of the column body 2 60 located at the slot hole 63 and close to the roller body 1 65.

[0072] In addition, in order to adapt to the deflection of the intermediate base layer 1, the upper surface layer 2 and the lower surface layer 3 can also be deflected and adjusted, specifically: Figure 5 , Figure 8 As shown, the radius of the pressure wheel body 19 is R, the radius of the circle where the center of the arc on the side of the long guide groove 102 close to the center O2 is R3, and the radius of the circle where the center of the arc on the side of the long guide groove 102 away from the center O2 is R2, then R2>R>R3, a telescopic cylinder (not shown in the figure) 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 31, so that the coating roller 31 can guide the deviation of the upper surface layer 2 and the lower surface layer 3 above, such as 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, so that the deviation of the intermediate base layer 1 can be adapted and adjusted.

[0073] Note that the angle between the line from the center of the arc at the rightmost end of the pressure roller guide groove 36 to the center O2 and the horizontal line is β11. Figure 5As shown, there are five long guide grooves 102, of course, there can be more. The angle between the axis of the long guide groove 102 and the connection from the center of the arc of the rightmost end of the upper roller guide groove 36 to the center O2 is Ω1, and the angles between the axes of adjacent long guide grooves 102 are Ω2, Ω3, Ω4 and Ω5 respectively. The angle between the line connecting the center of the arc of the rightmost end of the roller guide groove 37 to the center O2 and the horizontal line is β21, and the angle between the axis of the long guide groove 102 and the center of the arc of the rightmost end of the lower roller guide groove 37 to the center O2 is Ω6. The angles between the axes of adjacent long 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, and are both composed of a plurality of arc frames 103. The arc frame 103 includes an arc 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 guide groove 105 is r, and the center is O4. The angle between the line connecting the center of the third arc 108 and O4 and the connection between the center of the fourth arc 109 and O4 is δ3, and δ3>Ω. Preferably, δ3=2Ω or 3Ω. In this way, the coating roller 31 can maintain an arc shape when moving, thereby achieving a better guiding effect for the upper surface layer 2 and the lower surface layer 3.

[0075] Note that the angle between the line connecting the center of the leftmost arc of the upper roller guide groove 36 to O2 and the horizontal line is γ11, and the angle between the line connecting the center of the leftmost arc of the lower roller guide groove 37 to O2 and the horizontal line is γ21, 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 pressing roller 14, the second upper pressing roller 15, the first lower pressing roller 16 and the second lower pressing roller 17 are all achieved by arranging a hydraulic telescopic cylinder or a telescopic motor at the end. The specific driving structure is common knowledge in the field and will not be described here.

[0078] Preferably, the coating roller 2 43 and the coating roller 1 31 have the same structure, both including a roller body and a rotating shaft. The roller body can rotate on the rotating shaft. The rotating shaft is a hollow shaft structure. Slurry is provided to the rotating shaft through a liquid supply pipe. The slurry is fed into the rotating shaft through a hydraulic pump and other structures. A plurality of discharge holes may be provided on the side of the rotating shaft close to the fabric. The slurry flows out from the discharge holes and then is supplied to the fabric through the roller body. The specific coating roller structure is common knowledge in the art and is not the focus of the present application, so it will not be described in detail.

[0079] like Fig.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 1, the upper pressure roller guide groove 2, the lower pressure roller guide groove 1 and the lower pressure roller guide groove 2 are all R1, and R1>R2.

[0081] Example 2

[0082] like Figure 1 As shown, the present application also provides a high-elasticity zero-fold ultrafine fiber, which includes an upper surface layer 2, an intermediate base layer 1 and a lower surface layer 3 stacked in sequence, and the upper surface layer 2, the intermediate base layer 1 and the lower surface layer 3 are formed by laminating the intermediate lamination component 7.

[0083] In order to facilitate those skilled in the art to understand the intermediate lamination component of the present application, the working process of the intermediate lamination component is described as follows: when it is necessary to laminarize each layer, the intermediate base layer 1 passes through the inner guide groove 40 formed by the two first mounting grooves 85, and at the same time, the upper surface layer 2 passes through the first smoothing component 20 and the first coating component 21 in turn, and the lower surface layer 3 passes through the second smoothing component 22 and the second coating component 23 in turn. 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 accommodating groove 27, so that the wrinkles can be smoothed. After the wrinkles are smoothed, the first coating component 21 or the second coating component 23 is entered for coating, and the coating slurry is applied to the surface layer. Since there are multiple coating rollers for coating, uniform coating can be performed. Finally, high-elasticity zero-fold ultrafine fibers are formed by lamination of the second upper pressing roller 15 and the second lower pressing roller 17. A deflection sensor is provided in the inner guide groove 40, such as a camera, an infrared sensor, etc. After detecting that the intermediate base layer 1 is deflected, The information is transmitted to the first rotating telescopic frame 45 and the second rotating telescopic frame 46 (the rotating telescopic frame can realize rotation and extension, such as being set to a rotating frame structure driven by a hydraulic telescopic cylinder and a motor. Its specific structure is not shown in the figure and is common knowledge in the field, so it will not be repeated here). The first rotating telescopic frame 45 and / or the second rotating telescopic frame 46 rotates, so that the coating roller 43 deflects by a certain angle, so that the transmission of the intermediate base layer 1 can be corrected. 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 synchronously, so that the upper surface layer 2, the intermediate base layer 1 and the lower surface layer 3 can be aligned during stacking. In addition, a deflection sensor is also provided on the first outer supporting circular plate 12 and / or the second outer supporting 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 synchronously for adjustment, so that the pressed fabric can be neat and wrinkle-free, thereby improving the fabric performance.

[0084] The above detailed description of the present invention is intended to enable persons familiar with the art to understand the contents of the present invention and implement them. It does not limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A process for preparing ultrafine fibers, characterized in that: The steps of the preparation process include:

1. Layer preparation: A non-woven fabric is made from fibers. The non-woven fabric is impregnated with an impregnation liquid and then subjected to a weight reduction treatment to obtain an intermediate base layer (1) of ultrafine fibers. The impregnation liquid is a mixed liquid of polyester polyurethane and polyether polyurethane. After impregnation, a non-woven fabric base fabric containing a saturated polyurethane mixed slurry is formed. The impregnated non-woven fabric passes through an aqueous solution of dimethylformamide to solidify the polyurethane and form pores to obtain a synthetic leather semi-finished product. After a weight reduction treatment with toluene, an intermediate base layer (1) is obtained. A polyurethane resin, DMF, a color paste and a leveling agent mixture are coated on a release paper (10), and the mixture is heated and dried to form an upper surface layer (2). A polyurethane resin, DMF, a color paste and a leveling agent mixture are coated on a release paper (11), and the mixture is heated and dried to form a lower surface layer (3). An adhesive layer slurry is prepared, and a polyester polyol and an isocyanate prepolymer are mixed as the adhesive layer slurry, or a polyurethane resin is used as the adhesive layer slurry.

2. Surface layer lamination: The intermediate base layer (1) passes through the intermediate pressing component (7) without being bent, the upper surface layer (2) is bent in a first direction to pass through the upper surface of the intermediate pressing component (7), and the lower surface layer (3) is bent in a second direction to pass through the lower surface of the intermediate pressing component (7); the upper surface layer (2), the intermediate base layer (1) and the lower surface layer (3) are pressed together to form an ultrafine fiber cloth, and the first direction and the second direction are opposite.

2. A process for preparing ultrafine fibers according to claim 1, characterized in that: The adhesive layer slurry is provided through the upper surface and the lower surface of the intermediate pressing component (7) and the interior of the intermediate pressing component (7), and is coated on the contact surface between the upper surface layer (2) and the intermediate base layer (1), and is coated on the contact surface between the intermediate base layer (1) and the lower surface layer (3).

3. The process for preparing ultrafine fibers according to claim 1, characterized in that: The intermediate pressing assembly (7) comprises a first outer supporting circular plate (12), a second outer supporting 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 supporting circular plate (12) and the second outer supporting circular plate (13); the inner pressing assembly (18) comprises a pressing wheel body (19); the left and right sides of the pressing wheel body (19) are respectively fixedly arranged on the inner side of the first outer supporting circular plate (12) and the inner side of the second outer supporting circular plate (13); the center of the intermediate pressing assembly (7) is denoted as O1, the intermediate base layer (1) passes through the center of the circle O1, and is arranged horizontally; the upper surface layer (2) passes through the first upper After passing through the first lower pressing roller (16), the lower surface layer (3) is bent and wound around the lower surface of the pressing wheel body (19), and then passed through the second upper pressing roller (15) and pressed onto the upper side of the intermediate base layer (1). The upper surface layer (2) between the first upper pressing roller (14) and the second upper pressing roller (15) is recorded as the first bent surface layer. After passing through the first lower pressing roller (16), the lower surface layer (3) is bent and wound around the lower surface of the pressing wheel body (19), and then passed through the second lower pressing roller (17) and pressed onto the lower side of the intermediate base layer (1). The lower surface layer (3) between the first lower pressing roller (16) and the second lower pressing roller (17) is recorded as the second bent surface layer. The curvature of the first curved surface layer is the same as that of the second curved surface layer, and the bending directions are opposite.

4. A process for preparing ultrafine fibers according to claim 3, characterized in that: 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 supporting circular plate (12) and the second outer supporting 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 first curved surface layer close to the first lower pressing roller (1 6), the second coating component (23) is attached to the distal end of the second curved surface layer close to the second lower pressure roller (17), an inner guide groove (40) is opened on the inner side of the pressure wheel body (19), the intermediate coating component (24) is arranged 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) coats the adhesive layer slurry, the second smoothing component (22) can smooth the wrinkles on the second curved surface layer, and then the second coating component (23) coats the adhesive layer slurry, and the intermediate coating component (24) can coat the upper and lower surfaces of the intermediate base layer (1) with the adhesive layer slurry.

5. A process for preparing ultrafine fibers according to claim 4, characterized in that: The pressure wheel body (19) comprises a middle horizontal handle (25) and a fan-shaped body (26), wherein 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 2 (30), and a plurality of fan-shaped receiving grooves (27) are respectively arranged at two ends of the fan-shaped body (26), and the first smoothing component (20) and the second smoothing component (22) have the same structure, and both the first smoothing component (20) and the second smoothing component (22) comprise a plurality of fan-shaped An expansion column (28), wherein the plurality of fan-shaped expansion columns (28) are respectively slidably disposed in the plurality of fan-shaped receiving grooves (27), and gas is introduced into the fan-shaped expansion column (28) to expand the fan-shaped expansion column (28), and the fan-shaped expansion column (28) slides out of the fan-shaped receiving groove (27), thereby smoothing the wrinkles of the first curved surface layer or the second curved surface layer, wherein the first coating component (21) is arranged in the fan-shaped notch one (29), and the second coating component (23) is arranged in the fan-shaped notch two (30).

6. A process for preparing ultrafine fibers according to claim 5, 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), wherein the 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 arranged on the front and rear sides of the first straight side plate (47) and the second straight side plate (48), and the upper arc-shaped plate group (49) is arranged on the The first straight side plate (47) and the second straight side plate (48) are disposed at the upper ends thereof, and the lower arc plate group (50) is disposed at the lower ends thereof. 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 plate group (49) and the lower arc plate group (50). The first straight side plate (47) and the second straight side plate (48) can move closer to or farther from each other while keeping the angle α unchanged.

7. The process for preparing ultrafine fibers according to claim 4, characterized in that: The first coating assembly (21) and the second coating assembly (23) have the same structure, and both comprise 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), the two sides of the plurality of coating rollers (31) being slidably arranged on the first outer supporting circular plate (12) and the second outer supporting circular plate (13), two groups of first guide groove groups (34) being arranged on the first outer supporting circular plate (12), and two groups of second guide groove groups (35) being arranged on the second outer supporting circular plate (13), the first guide groove group (34) and the second guide groove group (35) having the same structure, both consisting of a plurality of long guide grooves (102), and an upper pressure roller guide groove being arranged above the first outer supporting circular plate (12). One (36), a lower pressure roller guide groove one (37) is arranged below, an upper pressure roller guide groove two (38) is arranged above the second outer supporting circular plate (13), and a lower pressure roller guide groove two (39) is arranged below, the first upper pressure roller (14) and the second upper pressure roller (15) are arranged at both ends 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 center of the first outer supporting circular plate (12) is O2, then the axis of the long guide groove (102) passes through the center of the circle O2, and the spacing between the plurality of long guide grooves (102) of the first guide groove group (34) or the second guide groove group (35) is the same.

8. The process for preparing ultrafine fibers according to claim 7, characterized in that: The radius of the pressure wheel body (19) is R, the radius of the circle where the center of the arc on the side of the long guide groove (102) close to the center O2 is R3, and the radius of the circle where the center of the arc on the side of the long guide groove (102) away from the center O2 is R2, then R2>R>R3, a telescopic cylinder is provided at the first outer supporting circular plate (12) and the second outer supporting circular plate (13), one end of the telescopic cylinder is provided at the center O2, and the other end is provided at the end of the coating roller one (31), so that the coating roller one (31) can correct and guide the deviation of the upper surface layer (2) and the lower surface layer (3) thereon.

9. The process for preparing ultrafine fibers according to claim 4, characterized in that: The intermediate coating assembly (24) comprises a third coating assembly (41) respectively arranged above the inner guide groove (40) and a fourth coating assembly (42) respectively arranged below the inner guide groove (40); the third coating assembly (41) and the fourth coating assembly (42) have the same structure, and both comprise a parallelogram bracket (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 arranged in the parallelogram bracket (44); one end of the first rotating telescopic frame (45) and one end of the second rotating telescopic frame (46) are arranged on the parallelogram bracket (44); the other end of the first rotating telescopic frame (45) and the other end of the second rotating telescopic frame (46) are both arranged on the pressure wheel body (19).

10. A highly elastic zero-fold ultrafine fiber, comprising an upper surface layer (2), an intermediate base layer (1) and a lower surface layer (3) stacked in sequence, characterized in that: The high-elasticity zero-fold ultrafine fiber is made by the ultrafine fiber preparation process described in any one of claims 1 to 9.

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