Bright chinlon double-line-grid TPU white film fabric and preparation process

Abstract

The invention belongs to the technical field of cloth preparation, and particularly relates to a lustrous chinlon double-line-grid TPU white film fabric and a preparation technology, the lustrous chinlon double-line-grid fabric comprises lustrous chinlon double-line-grid base cloth and a TPU white film layer, the lustrous chinlon double-line-grid base cloth is woven by 70D / 144F lustrous chinlon filaments, warp yarn and weft yarn are interwoven to form double-line-grid texture, and the gram weight of the base cloth is 110 + / -5g / m < 2 >; and the TPU white film layer is an aliphatic polyether type TPU white film. According to the fabric, through cooperation of the adjusting mechanism, the flattening roller, the preheating mechanism and the hot-pressing component, the problems of uneven tension, wrinkles, deviation, bubbles and the like of a cloth film are solved from the source; the gradient elastic compression roller is self-adaptive to the double-line grid texture, so that the composite fastness is ensured, and the grid lines are prevented from being collapsed by pressing; the design of attaching an additional hot roller to the extremely small wrap angle of the TPU white film and horizontally and straightly feeding the base cloth prevents the material from being damaged by heat and the luster from being attenuated, and greatly improves the composite yield and the fabric texture.

Description

Technical Field

[0001] This invention relates to the field of fabric preparation technology, and in particular to a bright nylon double-line TPU white film fabric and its preparation process. Background Technology

[0002] As sportswear and outdoor apparel upgrade towards lightweight, functional, and fashionable designs, bright nylon double-threaded checkered fabric, with its high gloss and three-dimensional texture, combined with the waterproof, breathable, windproof, and UV-resistant properties of a TPU white film, has become a core fabric for high-end sports jackets, sun-protective clothing, and outdoor functional apparel. Currently, this type of fabric is mostly prepared using traditional solvent-free hot-pressing composite processes, but its production process suffers from many insurmountable technical defects. Firstly, traditional composite equipment has a crude tension control system. The tension of the nylon base fabric and the TPU white film is not synchronized. The conventional flattening rollers alone cannot eliminate the internal stress and dynamic wrinkles of the material. The feed is prone to deviation and wrinkling, which will form permanent defects after hot pressing. Secondly, the hot-pressing composite roller uses a solid homogeneous silicone roller, which has uneven pressure distribution and is prone to crushing the double-line grid three-dimensional texture, resulting in the loss of the fabric's three-dimensionality, poor bonding at the grid grooves, and easy generation of air bubbles at the interface. Third, the interface compatibility between bright nylon and TPU white film is poor. It relies solely on physical hot pressing for bonding, resulting in low interfacial peel strength. After repeated washing, it is prone to delamination and peeling, leading to poor functional durability. Fourth, TPU white film has weak thermal stability. Traditional single-stage preheating and high-temperature hot pressing are prone to thermal shock, which leads to yellowing of the white film and uneven whiteness. At the same time, high-temperature contact can easily damage the luster of the bright nylon surface, seriously affecting the appearance quality of the fabric. Fifth, the entire process lacks precise closed-loop control, resulting in poor batch stability and low yield, which fails to meet the needs of large-scale, high-quality production of high-end sports fabrics.

[0003] To address the above problems, this invention proposes a bright nylon double-line TPU white film fabric and its preparation process. Summary of the Invention

[0004] Based on the existing technical problems in the preparation of bright nylon double-line grid TPU white film fabric, such as rough tension control, easy collapse of double-line grid texture, weak bonding force of composite interface, easy yellowing of TPU white film, easy wrinkling and bubble formation of fabric, and easy damage to the luster of bright nylon, this invention proposes a bright nylon double-line grid TPU white film fabric and its preparation process.

[0005] This invention proposes a bright nylon double-line grid TPU white film fabric, comprising a bright nylon double-line grid base fabric and a TPU white film layer. The bright nylon double-line grid base fabric is woven from 70D / 144F bright nylon filaments, with warp and weft yarns interwoven to form a double-line grid texture, and the base fabric weight is 110±5g / ㎡. The TPU white film layer is an aliphatic polyether type TPU white film with a thickness of 0.05~0.10mm and a whiteness ≥92%. The bright nylon double-line grid base fabric and the TPU white film layer are integrally bonded by solvent-free hot pressing, with a composite interface peel strength ≥18N / 3cm, a fabric waterproof pressure ≥10000mmH2O, and a moisture permeability ≥3200g / (m²・24h).

[0006] Preferably, the spacing between the double-line grids of the bright nylon double-line grid base fabric is 0.2~0.4mm, the height of the grid protrusion is 0.15~0.25mm, and the warp and weft density is 200×180 threads / inch.

[0007] Preferably, the TPU white film layer is mixed with 50~100nm nano titanium dioxide, with a doping amount of 8%~12%, and the fabric UPF≥50+.

[0008] Preferably, the fabric with the bright nylon double-line grid base fabric and the TPU white film laminated together has an overall weight of 160±10g / ㎡, a shrinkage rate of ≤3% in both warp and weft directions, and a gloss of ≥80GU on the surface of the bright nylon at 60°.

[0009] Preferably, the preparation process of the aforementioned bright nylon double-line grid TPU white film fabric includes the following specific steps: S1. The 70D / 144F bright nylon filament is wound and warped, and then woven on a water jet loom in a double-line grid structure to obtain the bright nylon double-line grid base fabric. Defects are removed by pre-fabric inspection. S2. Aliphatic polyether TPU particles are mixed with nano titanium dioxide, and the TPU white film layer is obtained by hot air drying, twin-screw extrusion, and casting calendering. The surface energy is improved by corona treatment. S3. The bright nylon double-line grid base fabric and the TPU white film layer are unwound in a dual-station manner, and constant tension conveying is achieved through magnetic powder tension closed loop and tension floating roller. After online correction and stretching to align the grid pattern, it is then shallowly preheated by gradient preheating roller. S4. The pretreated bright nylon double-line grid base fabric and the TPU white film layer are horizontally fed into the hot-press composite roller group. The TPU white film layer is attached to the heating roller, and the bright nylon double-line grid base fabric is attached to the lower gradient elastic pressure roller. Instantaneous high temperature and high pressure solvent-free composite. S5. The composite fabric is rapidly cured by a dual-effect air-water cooling roller. S6. After stretching, setting, inspection, and rolling, the finished fabric is obtained.

[0010] Preferably, the feeding pretreatment equipment of S3 includes an adjustment mechanism, which includes symmetrically arranged crosses. The lower end of each cross has an arc-shaped groove. An adjustment roller is arranged between the two crosses. The two ends of the adjustment roller are slidably connected to the inner wall of the arc-shaped groove. A guide roller is designed at the upper end between the two crosses. An auxiliary roller is rotatably connected to both ends of the transverse frame of the crosses. A cylinder is respectively arranged on the outer side of each of the two crosses. The upper end of the piston rod of the cylinder is fixedly connected to both ends of the adjustment roller. The surface of the bright nylon double-threaded base fabric is slidably connected to the surface of the auxiliary roller and the surface of the adjustment roller. The surface of the TPU white film layer is slidably connected to the surface of the guide roller.

[0011] Preferably, an operating table is provided on one side of the adjustment mechanism, and a flattening roller with an upper and lower roller design is provided at one end of the operating table. One end of the bright nylon double-threaded base fabric and one end of the TPU white film layer pass between the two rollers of the flattening roller, respectively. A preheating mechanism is provided above the operating table, and a hot pressing component is provided at the other end of the operating table.

[0012] Preferably, the preheating mechanism includes support frames arranged along both sides of the operating table. A circular groove is provided at the axisymmetrical part of the operating table. A preheating roller is arranged inside the circular groove. The two ends of the preheating roller are rotatably connected to the inner side of the support frame. A smoothing plate adapted to the preheating roller is arranged directly above it. An electric telescopic rod is fixedly connected to the upper end of the smoothing plate. Support plates are fixedly connected to the inner sides of the two support frames. The lower side of the support plate is fixedly connected to the upper end of the electric telescopic rod. A smoothing roller is arranged above the support plate. The surface of the smoothing roller is slidably connected to the surface of the bright nylon double-threaded base fabric. The surface of the preheating roller is slidably connected to the surface of the TPU white film layer.

[0013] Preferably, the hot pressing component includes a lower heating roller and an upper gradient elastic pressure roller, both of which are driven by independent servo motors with a speed difference accuracy of ≤±0.1%; the lower heating roller is an electromagnetic induction heating roller with a temperature of 148~152℃ and a temperature control accuracy of ±1℃; the upper gradient elastic pressure roller consists of a rigid mandrel, a high-hardness support layer, a gradient buffer layer, a flexible bonding layer, and an anti-stick coating, from the inside out, with the Shore hardness decreasing from A90~95 to A70~75.

[0014] Preferably, during hot pressing, the TPU white film layer is attached to the heating roller with a very small wrap angle of 15°~30°, and the bright nylon double-line grid base fabric is fed horizontally and straight without covering any roller surface.

[0015] The beneficial effects of this invention are as follows: 1. By solvent-free lamination of bright nylon double-line grid base fabric and TPU white film layer, multiple properties such as high gloss texture, three-dimensional texture, waterproof and breathable, and UV resistance are integrated; the bright nylon cross section has uniform reflectivity, the double-line grid texture is regular and three-dimensional, and the TPU white film has high whiteness and does not yellow, so the fabric has both aesthetics and functionality; at the same time, the fabric has high peel strength, good washability, low shrinkage rate, and stable physical properties, which fully meet the wearing and appearance requirements of high-end sports and outdoor clothing.

[0016] 2. By coordinating the adjustment mechanism, flattening roller, preheating mechanism and hot pressing components, problems such as uneven fabric tension, wrinkles, offset, and bubbles are eliminated from the source; the gradient elastic pressure roller adapts to the double-line grid texture, which not only ensures the composite strength but also prevents the grid from being crushed; the TPU white film with minimal corner wrapping and additional hot roller, and the design of horizontal and straight feeding of the base fabric prevent the material from being damaged by heat and the gloss from fading, which greatly improves the composite yield and fabric texture. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a bright nylon double-line grid TPU white film fabric proposed in this invention; Figure 2 This is a diagram showing the position of the adjustment mechanism for a bright nylon double-line grid TPU white film fabric proposed in this invention. Figure 3 This is a front view of the adjustment mechanism of a bright nylon double-line grid TPU white film fabric proposed in this invention; Figure 4 This is a perspective view of a preheating mechanism for a bright nylon double-line grid TPU white film fabric proposed in this invention. Figure 5 This is a three-dimensional view of a flat sheet of a bright nylon double-line grid TPU white film fabric proposed in this invention. Figure 6 This is a process flow diagram for preparing a bright nylon double-line TPU white film fabric proposed in this invention.

[0018] In the diagram: 1. Bright nylon double-lined base fabric; 2. TPU white film layer; 3. Adjustment mechanism; 31. Cross; 32. Arc groove; 33. Adjustment roller; 34. Auxiliary roller; 35. Guide roller; 36. Cylinder; 4. Flattening roller; 5. Operating table; 6. Preheating mechanism; 61. Support frame; 62. Preheating roller; 63. Smoothing plate; 64. Electric telescopic rod; 65. Support plate; 66. Smoothing roller; 7. Hot pressing component. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Reference Figures 1-3 A type of bright nylon double-line grid TPU white film fabric includes a bright nylon double-line grid base fabric 1 and a TPU white film layer 2. The bright nylon double-line grid base fabric 1 is woven from 70D / 144F bright nylon filaments, with warp and weft yarns interwoven to form a double-line grid texture, and the base fabric weight is 110±5g / ㎡. The TPU white film layer 2 is an aliphatic polyether type TPU white film with a thickness of 0.05~0.10mm and a whiteness ≥92%. The bright nylon double-line grid base fabric 1 and the TPU white film layer 2 are solvent-free hot-pressed composites, with a composite interface peel strength ≥18N / 3cm, a fabric waterproof pressure ≥10000mmH2O, and a moisture permeability ≥3200g / (m²・24h).

[0021] In this embodiment, the double-line grid spacing of the bright nylon double-line grid base fabric 1 is 0.2~0.4mm, the grid protrusion height is 0.15~0.25mm, and the warp and weft density is 200×180 threads / inch.

[0022] Specifically, the bright nylon double-line grid base fabric 1 is woven with a water jet loom using a double-line double-closed plain weave structure. The warp and weft yarns are interwoven with double strands of bright nylon filaments to form a regular and three-dimensional double-line grid texture. The fabric surface has distinct texture and strong sense of layering, while improving the fabric's structural strength and resistance to deformation.

[0023] In this embodiment, 50~100nm nano titanium dioxide is mixed into the TPU white film layer 2, with a doping amount of 8%~12%, and the fabric UPF≥50+.

[0024] Specifically, nano titanium dioxide is evenly dispersed inside the TPU white film layer 2. On the one hand, it improves the whiteness and coverage of the white film to prevent yellowing from showing through the bottom. On the other hand, it can efficiently absorb and reflect ultraviolet rays, enabling the fabric to reach a UPF50+ UV protection level, making it suitable for outdoor sun protection sportswear.

[0025] In this embodiment, the fabric with a gloss of 160±10g / ㎡ is formed by pressing the bright nylon double-line grid base fabric 1 and the TPU white film layer 2 together. The overall weight of the fabric is 160±10g / ㎡, the shrinkage rate in both the warp and weft directions is ≤3%, and the gloss of the bright nylon surface at 60° is ≥80GU.

[0026] Specifically, the fabric weight is controlled by the combination of the base fabric weight and the thickness of the TPU white film layer 2. The shrinkage rate in the warp and weft directions is controlled within 3% by the stretching and setting process to ensure dimensional stability. The bright nylon filament adopts a triangular cross section, which reflects light evenly and has a surface gloss of ≥80GU, presenting a high-gloss mirror texture without loss of gloss or matte defects.

[0027] In this embodiment, refer to Figures 1-6 A preparation process for a bright nylon double-line grid TPU white film fabric, the specific steps of which are as follows: S1. The 70D / 144F bright nylon filament is wound and warped, and then woven on a water jet loom in a double-line grid structure to obtain bright nylon double-line grid base fabric 1. Defects are removed by warping inspection. S2. Aliphatic polyether TPU particles are mixed with nano titanium dioxide, and TPU white film layer 2 is obtained by hot air drying, twin-screw extrusion and casting calendering. The surface energy is improved by corona treatment. S3. Bright nylon double-line grid base fabric 1 and TPU white film layer 2 are unwound in a dual-station manner, and constant tension conveying is achieved through magnetic powder tension closed loop and tension floating roller. After online correction and stretching to align the grid pattern, it is then shallowly preheated by gradient preheating roller. S4. The pretreated bright nylon double-line grid base fabric 1 and TPU white film layer 2 are horizontally entered into the hot press composite roller group. The TPU white film layer 2 is attached to the heating roller, and the bright nylon double-line grid base fabric 1 is attached to the lower gradient elastic pressure roller. Instant high temperature and high pressure solvent-free composite. S5. The composite fabric is rapidly cured by a dual-effect air-water cooling roller. S6. After stretching, setting, inspection, and rolling, the finished fabric is obtained.

[0028] In this embodiment, the feeding pretreatment equipment of S3 includes an adjustment mechanism 3, which includes symmetrically arranged crosses 31. The lower end of the crosses 31 is provided with an arc-shaped groove 32. An adjustment roller 33 is provided between the two crosses 31. The two ends of the adjustment roller 33 are slidably connected to the inner wall of the arc-shaped groove 32. A guide roller 35 is designed at the upper end between the two crosses 31. The two ends of the transverse frame of the crosses 31 are rotatably connected to the auxiliary rollers 34. Cylinders 36 are respectively provided on the outer side of the two crosses 31. The upper end of the piston rod of the cylinder 36 is fixedly connected to the two ends of the adjustment roller 33. The surface of the bright nylon double-threaded base fabric 1 is slidably connected to the surface of the auxiliary roller 34 and the surface of the adjustment roller 33. The surface of the TPU white film layer 2 is slidably connected to the surface of the guide roller 35.

[0029] Specifically, the cylinder 36 drives the adjusting roller 33 to slide up and down along the arc groove 32, adaptively adjusting the conveying tension of the bright nylon double-line grid base fabric 1. Combined with the magnetic powder tension closed-loop system, the tension fluctuation is controlled within ≤±2N, avoiding the base fabric from being stretched and deformed, and the grid pattern from being skewed. At the same time, it ensures that the TPU white film layer 2 is conveyed smoothly without loosening.

[0030] In this embodiment, an operating table 5 is provided on one side of the adjustment mechanism 3, and a flattening roller 4 with an upper and lower roller design is provided at one end of the operating table 5. One end of the bright nylon double-line grid base fabric 1 and one end of the TPU white film layer 2 pass between the two rollers of the flattening roller 4 respectively. A preheating mechanism 6 is provided above the operating table 5, and a hot pressing component 7 is provided at the other end of the operating table 5.

[0031] Specifically, the flattening roller 4 has an upper and lower double arc-shaped bending roller structure, which can flatten the base fabric and white film laterally, eliminate curling and initial wrinkles, and allow the two layers of materials to enter the preheating and lamination process in a flat state, reducing lamination bubbles and wrinkle defects from the source.

[0032] In this embodiment, the preheating mechanism 6 includes support frames 61 arranged along both sides of the operating table 5. A circular groove is provided at the axisymmetrical part of the operating table 5. A preheating roller 62 is arranged inside the circular groove. The two ends of the preheating roller 62 are rotatably connected to the inner side of the support frame 61. A smoothing plate 63 adapted to the preheating roller 62 is arranged directly above it. An electric telescopic rod 64 is fixedly connected to the upper end of the smoothing plate 63. Support plates 65 are fixedly connected to the inner side of the two support frames 61. The lower side of the support plate 65 is fixedly connected to the upper end of the electric telescopic rod 64. A smoothing roller 66 is arranged above the support plate 65. The surface of the smoothing roller 66 is slidably connected to the surface of the bright nylon double-threaded base fabric 1. The surface of the preheating roller 62 is slidably connected to the surface of the TPU white film layer 2.

[0033] Specifically, the preheating roller 62 adopts gradient segmented heating, with the temperature controlled at 70~105℃, to perform shallow preheating of the TPU white film layer 2 for 0.6~1.5 seconds to eliminate internal stress; the electric telescopic rod 64 drives the smoothing plate 63 to fit against the surface of the white film to prevent the white film from curling or rolling during preheating, and the smoothing roller 66 simultaneously ensures the flat conveying of the base fabric.

[0034] In this embodiment, the hot pressing component 7 includes a lower heating roller and an upper gradient elastic pressure roller, both of which are driven by independent servo motors with a speed difference accuracy of ≤±0.1%. The lower heating roller is an electromagnetic induction heating roller with a temperature of 148~152℃ and a temperature control accuracy of ±1℃. The upper gradient elastic pressure roller consists of a rigid mandrel, a high-hardness support layer, a gradient buffer layer, a flexible bonding layer, and an anti-stick coating, from the inside out. The Shore hardness gradually decreases from A90~95 to A70~75.

[0035] Specifically, an independent servo motor enables precise control of the speed difference between the upper and lower rollers, preventing material stretching; the gradient elastic pressure roller adapts to the concave and convex texture of the double-line grid, providing flexible buffering and pressure relief for the raised parts of the grid, and replenishing pressure and venting air in the grooved parts, ensuring both composite strength and preventing the collapse of the three-dimensional texture.

[0036] In this embodiment, during hot pressing, the TPU white film layer 2 is attached to the heating roller with a very small wrapping angle of 15°~30°, and the bright nylon double-line grid base fabric 1 is fed horizontally and straight without covering any roller surface.

[0037] Specifically, the extremely small corner feeding shortens the heating time of the white film, avoiding yellowing and melting of TPU and clogging of pores. The horizontal and straight feeding prevents wrinkles and damage to the gloss of the base fabric, while ensuring precise alignment and non-offset lamination of the two layers of materials. The finished fabric is free of bubbles and delamination, and the three-dimensional texture is completely preserved.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A bright nylon double-line grid TPU white film fabric, comprising a bright nylon double-line grid base fabric (1) and a TPU white film layer (2), characterized in that: The bright nylon double-line grid base fabric (1) is woven with 70D / 144F bright nylon filament, with warp and weft yarns interwoven to form a double-line grid texture, and the base fabric weight is 110±5g / ㎡; the TPU white film layer (2) is an aliphatic polyether type TPU white film with a thickness of 0.05~0.10mm and a whiteness ≥92%; the bright nylon double-line grid base fabric (1) and the TPU white film layer (2) are solvent-free hot-pressed composites, with a composite interface peel strength ≥18N / 3cm, a fabric waterproof pressure ≥10000mmH2O, and a moisture permeability ≥3200g / (m²・24h).

2. The bright nylon double-line grid TPU white film fabric according to claim 1, characterized in that: The bright nylon double-line grid base fabric (1) has a double-line grid spacing of 0.2~0.4mm, a grid protrusion height of 0.15~0.25mm, and a warp and weft density of 200×180 threads / inch.

3. The bright nylon double-line checkered TPU white film fabric according to claim 2, characterized in that: The TPU white film layer (2) is mixed with 50~100nm nano titanium dioxide, with a doping amount of 8%~12%, and the fabric UPF≥50+.

4. The bright nylon double-line checkered TPU white film fabric according to claim 3, characterized in that: The fabric, which is made by pressing the bright nylon double-line grid base fabric (1) and the TPU white film layer (2) together, has an overall weight of 160±10g / ㎡, a shrinkage rate of ≤3% in both warp and weft directions, and a gloss of ≥80GU on the surface of the bright nylon at 60°.

5. The preparation process of a bright nylon double-line grid TPU white film fabric according to claim 4, characterized in that, The specific steps are as follows: S1. The 70D / 144F bright nylon filament is wound and warped, and then woven on a water jet loom in a double-line grid structure to obtain the bright nylon double-line grid base fabric (1). Defects are removed by warp inspection. S2. Aliphatic polyether TPU particles are mixed with nano titanium dioxide, and the TPU white film layer (2) is obtained by hot air drying, twin-screw extrusion and casting calendering. The surface energy is improved by corona treatment. S3. The bright nylon double-line grid base fabric (1) and the TPU white film layer (2) are unwound in a dual-station manner, and constant tension conveying is achieved through magnetic powder tension closed loop and tension floating roller. The grid pattern is aligned by online correction and stretching, and then shallowly preheated by gradient preheating roller. S4. The pre-treated bright nylon double-line grid base fabric (1) and the TPU white film layer (2) are horizontally fed into the hot press composite roller group. The TPU white film layer (2) is attached to the heating roller, and the bright nylon double-line grid base fabric (1) is attached to the lower gradient elastic pressure roller. Instantaneous high temperature and high pressure solvent-free composite. S5. The composite fabric is rapidly cured by a dual-effect air-water cooling roller. S6. After stretching, setting, inspection, and rolling, the finished fabric is obtained.

6. The preparation process of a bright nylon double-line grid TPU white film fabric according to claim 5, characterized in that, The feeding pretreatment equipment of S3 includes an adjustment mechanism (3), which includes symmetrically arranged crosses (31). The lower end of the crosses (31) is provided with an arc groove (32). An adjustment roller (33) is provided between the two crosses (31). The two ends of the adjustment roller (33) are slidably connected to the inner wall of the arc groove (32). A guide roller (35) is designed at the upper end between the two crosses (31). An auxiliary roller (34) is rotatably connected to the two ends of the horizontal frame of the crosses (31). A cylinder (36) is provided on the outer side of the two crosses (31). The upper end of the piston rod of the cylinder (36) is fixedly connected to the two ends of the adjustment roller (33). The surface of the bright nylon double-threaded base fabric (1) is slidably connected to the surface of the auxiliary roller (34) and the surface of the adjustment roller (33). The surface of the TPU white film layer (2) is slidably connected to the surface of the guide roller (35).

7. The preparation process of a bright nylon double-line grid TPU white film fabric according to claim 6, characterized in that: An operating table (5) is provided on one side of the adjustment mechanism (3). A flattening roller (4) with an upper and lower roller design is provided at one end of the operating table (5). One end of the bright nylon double-line grid base fabric (1) and one end of the TPU white film layer (2) pass between the two rollers of the flattening roller (4). A preheating mechanism (6) is provided above the operating table (5). A hot pressing component (7) is provided at the other end of the operating table (5).

8. The preparation process of a bright nylon double-line grid TPU white film fabric according to claim 7, characterized in that: The preheating mechanism (6) includes support frames (61) arranged along both sides of the operating table (5). A circular groove is provided at the axisymmetric location of the operating table (5). A preheating roller (62) is arranged inside the circular groove. The two ends of the preheating roller (62) are rotatably connected to the inner side of the support frame (61). A smoothing plate (63) is arranged directly above the preheating roller (62). An electric telescopic rod (64) is fixedly connected to the upper end of the smoothing plate (63). A support plate (65) is fixedly connected to the inner side of the two support frames (61). The lower side of the support plate (65) is fixedly connected to the upper end of the electric telescopic rod (64). A smoothing roller (66) is arranged above the support plate (65). The surface of the smoothing roller (66) is slidably connected to the surface of the bright nylon double-threaded base fabric (1). The surface of the preheating roller (62) is slidably connected to the surface of the TPU white film layer (2).

9. The preparation process of a bright nylon double-line grid TPU white film fabric according to claim 8, characterized in that: The hot pressing component (7) includes a lower heating roller and an upper gradient elastic pressure roller, both of which are driven by independent servo motors with a speed difference accuracy of ≤±0.1%; the lower heating roller is an electromagnetic induction heating roller with a temperature of 148~152℃ and a temperature control accuracy of ±1℃; the upper gradient elastic pressure roller consists of a rigid mandrel, a high-hardness support layer, a gradient buffer layer, a flexible bonding layer, and an anti-stick coating layer from the inside out, with the Shore hardness decreasing from A90~95 to A70~75.

10. The preparation process of a bright nylon double-line grid TPU white film fabric according to claim 9, characterized in that: During hot pressing, the TPU white film layer (2) is attached to the heating roller with a very small wrapping angle of 15°~30°, and the bright nylon double-line grid base fabric (1) is fed horizontally and straight without covering any roller surface.

Images