Two-step wet production line and process for anti-shrinking automobile roof

Abstract

The application provides a two-step wet production line for preventing shrinkage of automobile canopy, which comprises two front-to-rear horizontal first tracks arranged side by side, the inner side walls of the two first tracks are respectively provided with front-to-rear movable sliding blocks at the rear ends, the inner side walls of the two sliding blocks are respectively provided with upper and lower lifting sliding blocks at the upper portions, the inner side walls of the two lifting sliding blocks are respectively provided with two horizontally opposite clamping jaws, the left and right sides of the top base material are respectively clamped between the upper and lower clamping plates of the two clamping jaws; the inner side walls of the lower clamping plates of the two clamping jaws are respectively provided with two staggered horizontal plates at the bottom portions; the inner side walls of the lower portions of the two sliding blocks are respectively provided with two horizontal supporting plates, the two horizontal supporting plates are respectively located directly below the two staggered horizontal plates, and the two staggered horizontal plates and the two horizontal supporting plates jointly clamp the left and right sides of the middle PU base material and the bottom base material; the two staggered horizontal plates can be horizontally retracted into the corresponding lower clamping plates; and an upper die and a lower die are arranged between the front portions of the two first tracks.

Description

Two-step wet production line and process for wrinkle-resistant car headliners Technical Field

[0001] This invention relates to a wet production line for automotive headliners, and more particularly to a two-step wet production line and process for anti-wrinkle automotive headliners. Background Technology

[0002] Patent document CN 115946283 A discloses a wet production process and application of a roof frame with in-mold pre-embedded bonding for an entertainment screen reinforcement panel. Paragraph

[0009] discloses that "the upper and lower surfaces of a PU foam sheet are rolled with adhesive to obtain a rolled-coated PU foam sheet. Then, glass fiber sheets are covered on both sides of the rolled-coated PU foam sheet to obtain a precursor material. The upper surface of the precursor material is covered with a first non-woven fabric, and the lower surface with a second non-woven fabric." Subsequently, the operator manually places the bonded material into a hot mold, which is then pressed once to obtain a composite substrate. The defect of the prior art is that the PU foam board softens and shrinks locally under hot pressure, causing the first non-woven fabric on its upper surface to shrink, resulting in an uneven top surface of the composite substrate. This means that the fabric subsequently bonded to the top surface of the composite substrate will also be uneven, ultimately leading to an uneven outer surface of the finished car roof. Summary of the Invention

[0003] The present invention aims to provide a two-step wet production line and process for anti-wrinkle automotive headliners, which can prevent the top layer substrate of fiberglass nonwoven fabric from wrinkling during hot pressing without the need for operators to manually place the composite substrate into the hot mold.

[0004] The inventors have developed the following solution. Two tracks are respectively set on the left and right sides of the lower mold, and two grippers are mounted on the inner sides of each track, lying horizontally opposite each other. Initially, the two grippers are located behind the top wall of the lower mold. The upper plates of each gripper rotate to face vertically upwards. Other transport devices place the bonded composite substrate onto the two horizontally lying lower plates. The upper plates then return to their original position, pressing down on the top wall of the composite substrate, thus keeping the composite substrate taut due to being gripped by the grippers. The bottom wall of the composite substrate is flush with the top wall of the lower mold. The two grippers move forward synchronously along their respective tracks, transporting the composite substrate to the top wall of the lower mold. The upper mold moves downwards, thus hot-pressing the taut composite substrate. This solution uses tracks and grippers to place the substrate into the hot mold, replacing manual operation. Furthermore, both the top and bottom layers of the fiberglass nonwoven fabric substrate do not shrink due to the tautness, thus solving the technical problems existing in the prior art. However, the PU middle layer in the composite substrate has poor toughness, so the PU middle layer is prone to breakage when subjected to hot pressure under tension.

[0005] The anti-wrinkle automotive headliner two-step wet production line includes two parallel front-to-back transverse first tracks. The rear ends of the inner walls of these tracks are each equipped with two forward-moving front-to-back sliders. The upper inner walls of each of these sliders are each equipped with a liftable upper-lower slider. The inner walls of these upper-lower sliders are each equipped with two horizontally opposing grippers. These grippers clamp the left and right sides of the top layer substrate between their respective upper and lower clamping plates. The bottom inner walls of the lower clamping plates of the two grippers are each equipped with two staggered horizontal plates. The lower inner sides of the two front-to-back sliders are each equipped with two horizontal support plates, located directly below the two staggered horizontal plates. These staggered horizontal plates and the two horizontal support plates together clamp the PU middle layer substrate and the bottom layer substrate. The left and right sides; two staggered horizontal plates can be laterally retracted into the corresponding lower clamping plates; an upper mold and a lower mold are provided between the front parts of the two first tracks. The two grippers and two horizontal support plates are driven by the corresponding front and rear sliders to move forward synchronously until the top, middle and bottom three substrates are sent to the top wall of the lower mold. The two horizontal support plates move down to place the PU middle substrate and bottom substrate on the lower mold. The two staggered horizontal plates are laterally retracted into the corresponding lower clamping plates to move away from the edge of the PU middle substrate. Then the lower clamping plates are driven by the upper and lower sliders to move down past the PU middle substrate, so that the top substrate in the taut state is bonded to the top wall of the PU middle substrate. The upper mold presses the top substrate in the taut state onto the top wall of the PU middle substrate.

[0006] Furthermore, a support platform flush with the top wall is provided between the two horizontal support plates. Behind the support platform is a conveyor belt for the bottom substrate, on which the bottom substrate has been placed. The rear of the top wall of the support platform is a transfer station. A clamping platform is located on the left side of the transfer station. A conveyor belt for the middle substrate, on which the middle layer substrate has been placed, is located in front of the clamping platform. A conveyor belt for the top substrate, on which the top layer substrate has been placed, is located behind the clamping platform. Above the clamping platform are two three-finger clamps, left and right, that can move laterally above the transfer station. Each three-finger clamp has three horizontal clamping fingers: upper, middle, and lower. The top substrate conveyor belt delivers the top substrate to the clamping platform, and the two three-finger clamps clamp the left and right sides of the top substrate between their respective upper and middle clamping fingers. In the process, the middle layer substrate conveyor belt delivers the middle layer substrate to the clamping platform. The left and right three-finger clamps clamp the left and right sides of the middle layer substrate between their respective middle and lower clamping fingers. The left and right three-finger clamps move laterally above the transfer station. The bottom layer substrate conveyor belt delivers the bottom layer substrate to the transfer station and is supported by two horizontal support plates. The lower clamping fingers of the left and right three-finger clamps release the middle layer substrate onto the bottom layer substrate. The two staggered horizontal plates and the two horizontal support plates together clamp the left and right sides of the PU middle layer substrate and the bottom layer substrate. The middle clamping fingers of the left and right three-finger clamps release the top layer substrate and are supported by the two lower clamping plates. The two grippers clamp the left and right sides of the top layer substrate between the upper and lower clamping plates.

[0007] The two-step wet process for anti-wrinkle automotive headliners uses the anti-wrinkle automotive headliner two-step wet process production line described above. This process includes the following steps: Step 1: The left and right three-finger clamps clamp the left and right sides of the top layer substrate between their respective upper and middle clamping fingers, and clamp the left and right sides of the middle layer substrate between their respective middle and lower clamping fingers; Step 2: The two three-finger clamps move above the two horizontal support plates, and the bottom layer substrate conveyor belt delivers the bottom layer substrate to the horizontal support plates; the upper and lower clamping plates of the two grippers are in a vertical state, and the lower clamping fingers of the two left and right three-finger clamps release the middle layer substrate onto the bottom layer substrate; Step 3: The two lower clamping plates, together with the two staggered horizontal plates, rotate inward to a horizontal state, so that the two staggered horizontal plates press the left and right sides of both the PU middle layer substrate and the bottom layer substrate onto the two horizontal support plates; Step 4: The middle clamping fingers of the left and right three-finger clamps release the top layer substrate, and the top layer substrate falls over the vertical position. The two upper clamping plates in the horizontal position then fall onto the two lower clamping plates in the horizontal position. The two upper clamping plates rotate inward to the horizontal position, thereby pressing the left and right edges of the top substrate onto the two lower clamping plates respectively. In step five, the upper clamping plates, lower clamping plates, and horizontal support plates simultaneously feed the top substrate, middle substrate, and bottom substrate into the lower mold. The two horizontal support plates move down, thereby loosening the middle substrate and bottom substrate and placing them onto the lower mold. In step six, each staggered horizontal plate retracts into the lower clamping plate, thereby moving away from directly above the edge of the middle substrate. Each upper clamping plate and lower clamping plate moves down from the corresponding side of the middle substrate, passing over the top wall of the middle substrate, thereby adhering the top substrate in the taut state to the top wall of the middle substrate. In step seven, the upper mold moves down to hot-press the top substrate in the taut state, the middle substrate in the relaxed state, and the bottom substrate into shape.

[0008] The beneficial effects are as follows: 1. No manual operation required. The system uses tracks and grippers to place the substrate into the hot mold, replacing manual operation. 2. Prevention of top substrate shrinkage. The top substrate is only bonded to the PU middle layer substrate after being placed directly above the lower mold. Once bonded, it does not require lateral movement, reducing the risk of relative displacement and shrinkage with the PU middle layer substrate. This is unlike the previous method where the top and middle / bottom layers needed to be clamped separately during transport. The top substrate is held taut by the grippers during transport and bonded to the PU middle layer substrate in this taut state, naturally maintaining this tautness. During hot pressing, the top substrate remains held taut, preventing shrinkage and resulting in a perfectly shaped automotive roof composite substrate with a flat top surface after hot pressing. 3. The middle layer substrate remains intact during hot pressing. During hot pressing, the middle and bottom layers are not clamped and remain relaxed, making the PU middle layer substrate less prone to breakage under pressure. Attached Figure Description

[0009] Figure 1 is a left-view perspective perspective of the two-step wet production line for anti-wrinkle automotive roofs of the present invention.

[0010] Figure 2 is a right-view perspective perspective view of the two-step wet production line for anti-wrinkle automotive roofs of the present invention.

[0011] Figure 3 is a cross-sectional view of the cross frame (21) and the three-finger clamp (22);

[0012] Figure 4 is a right-angle perspective view of the two-step wet production line for anti-wrinkle automotive roofs. In the figure, the top substrate (26) is already clamped at the top of the three-finger clamp (22).

[0013] Figure 5 is a right-view perspective of the two-step wet production line for anti-wrinkle car roofs. In the figure, the upper and lower parts of the three-finger clamp (22) have respectively clamped the top fiberglass nonwoven fabric substrate (26) and the PU middle layer substrate (13).

[0014] Figure 6 is a cross-sectional view of the cross frame (21) and the three-finger clamp (22) in Figure 5;

[0015] Figure 7 is a left-view perspective perspective of the two-step wet production line for anti-wrinkle car roofs. In the figure, the three-finger clamp (22) in Figure 5 has been moved to the right and directly above the transfer station (31).

[0016] Figure 8 is a left-view perspective perspective of the two-step wet production line for anti-wrinkle automotive headliners. In the figure, the fiberglass nonwoven fabric bottom substrate (9) has been moved forward to the top of the transfer station (31).

[0017] Figure 9 is a cross-sectional view of the three-finger clamp (22) and the double-layer clamping device (5) in Figure 8;

[0018] Figure 10 is an enlarged view of point A in Figure 9;

[0019] Figure 11 is an enlarged view of point A in Figure 9. In the figure, the PU middle layer substrate (13) has been released by the three-finger clamp (22) and thus falls onto the glass fiber nonwoven bottom substrate (9).

[0020] Figure 12 is an enlarged view of point A in Figure 9. In the figure, the PU middle layer substrate (13) and the glass fiber nonwoven bottom layer substrate (9) have been clamped by the lower layer of the double-layer clamping device (5).

[0021] Figure 13 is an enlarged view of point A in Figure 9. In the figure, the top layer substrate (26) of the glass fiber nonwoven fabric has been released by the three-finger clamp (22) and thus falls onto the PU middle layer substrate (13).

[0022] Figure 14 is an enlarged view of point A in Figure 9. In the figure, the top substrate of the glass fiber nonwoven fabric (26) has been clamped by the upper layer of the double-layer clamping device (5).

[0023] Figure 15 is an enlarged view of point A in Figure 9. In the figure, the double-layer clamping device (5) has been moved forward to place the PU middle layer substrate (13) and the glass fiber nonwoven bottom layer substrate (9) between the upper mold (2) and the lower mold (1).

[0024] Figure 16 is an enlarged view of point A in Figure 9. In the figure, the top layer substrate (26) of the glass fiber nonwoven fabric has been placed on the PU middle layer substrate (13) under tension.

[0025] In the diagram: 1. Lower mold; 2. Upper mold; 3. Supporting platform; 4. First track; 5. Double-layer clamping device; 6. Right gantry frame; 7. Bottom substrate conveyor belt; 9. Bottom substrate; 11. Left gantry frame; 12. Middle substrate conveyor belt; 13. PU middle substrate; 14. Glue spraying equipment; 15. First support; 16. Second support; 17. Second track; 18. Beam-shaped slider; 19. First vertical cylinder; 20. Movable rod; 21. Horizontal frame; 22. Three-finger clamp; 23. Top substrate conveyor belt; 24. Release agent spraying device; 25. Anti-wrinkle limiting block; 26. Top layer substrate; 27. Third bracket; 28. Fourth bracket; 30. Clamping platform; 31. Transfer station; 40. First spacing; 41. Second spacing; 45. Front and rear sliders; 51. Clamping vertical cylinder; 52. Horizontal support plate; 53. First hinge shaft; 54. Lower clamping plate; 55. Second hinge shaft; 56. Upper clamping plate; 57. Offset horizontal plate; 58. Upper and lower sliders; 220. Lower clamping finger; 221. Middle clamping finger; 222. Upper clamping finger; 223. Lower hinge shaft; 224. Middle hinge shaft; 225. Upper hinge shaft. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to specific embodiments.

[0027] As shown in Figure 2, the system includes a left gantry 11 and a right gantry 6 arranged side by side. To the right of the left gantry 11, a top substrate conveyor belt 23, a clamping platform 30, and a middle substrate conveyor belt 12 are arranged sequentially from back to front. A top substrate 26 made of fiberglass nonwoven fabric is placed on the top substrate conveyor belt 23, and a PU middle substrate 13 is placed on the middle substrate conveyor belt 12. The bottom wall of the PU middle substrate 13 is coated with adhesive, which only becomes sticky when heated. A glue spraying device 14 is located above the middle substrate conveyor belt 12, and is mounted on the left gantry 11 via a first bracket 15. The glue spraying device 14 sprays adhesive onto the top surface of the PU middle substrate 13 on the middle substrate conveyor belt 12. As shown in Figure 1, to the left of the right gantry 6, a bottom substrate conveyor belt 7, a support platform 3, and a lower mold 1 are arranged sequentially from back to front. A bottom substrate 9 made of fiberglass nonwoven fabric is placed on the bottom substrate conveyor belt 7. An upper mold 2 is provided above the lower mold 1, and the upper mold 2 is mounted on the left gantry frame 11 by the first bracket 15. A transfer station 31 is provided at the rear of the top wall of the supporting platform 3. The transfer station 31 is located directly to the right of the clamping platform 30. A second horizontal track 17 is provided directly above the transfer station 31 and the clamping platform 30, as shown in Figure 2. The bottom wall of the second track 17 is equipped with two left and right horizontal beam-shaped sliders 18. The bottom wall of each of the left and right horizontal beam-shaped sliders 18 is equipped with a first vertical cylinder 19 to install the horizontal frame 21, as shown in Figure 3. The inner side of each horizontal frame 21 is equipped with three horizontal upper, middle and lower clamping fingers 222, 221 and 220 through three hinge shafts 225, 224 and 223. These three clamping fingers 222, 221 and 220 together form a three-finger clamp 22. There are two three-finger clamps 22, one on the left and one on the right.

[0028] The first half of the process is as follows. As shown in Figures 3 and 4, the top substrate conveyor belt 23 delivers the top substrate 26 of fiberglass nonwoven fabric to the clamping platform 30. The lower clamping finger 220 and the middle clamping finger 221 rotate around the lower hinge shaft 223 and the middle hinge shaft 224 respectively to a vertically downward position, while the upper clamping finger 222 remains in a horizontal position. Each three-finger clamp 22, together with the corresponding horizontal frame 21, is driven downward by the first vertical cylinder 19 until the bottom wall of the upper clamping finger 222 presses against the top substrate 26. Subsequently, each middle clamping finger 221 rotates around the middle hinge shaft 224 to return to a horizontal position. Thus, the left and right three-finger clamps 22 clamp the left and right sides of the top substrate 26 between their respective upper and middle clamping fingers 221 and 222. Then, each three-finger clamp 22, together with the corresponding horizontal frame 21, is driven upward by the first vertical cylinder 19 to make room on the clamping platform 30. The middle layer substrate conveyor belt 12 then delivers the PU middle layer substrate 13 to the clamping platform 30. Each three-finger clamp 22, together with the corresponding horizontal frame 21, is driven downward by the first vertical cylinder 19 until the bottom wall of the middle clamping finger 221 presses against the top layer substrate 26. Subsequently, each lower clamping finger 220 rotates around the lower hinge shaft 223 to return to the horizontal state, as shown in Figure 6. Then, the left and right three-finger clamps 22 clamp the left and right sides of the PU middle layer substrate 13 between their respective middle and lower clamping fingers 221 and 220. In this state, a first gap 40 is left between the top layer substrate 26 and the PU middle layer substrate 13 to prevent them from bonding during transportation. As shown in Figure 7, the two three-finger clamps 22 on the left and right, as well as the horizontal frame 21 and the first vertical cylinder 19, are driven by the beam-shaped slider 18 to move along the second track 17 to the top of the transfer station 31 to wait for their turn.

[0029] Following the first half of the work process described above, the second half of the work process is as follows. As shown in Figures 8 to 10, the upper clamping plate 56 and the lower clamping plate 54 rotate around the first hinge axis 53 and the second hinge axis 55 respectively to a vertically upward state, thus disengaging from directly below the three-finger clamp 22. The bottom substrate conveyor belt 7 delivers the bottom substrate 9 to the transfer station 31, where it is supported by the two horizontal support plates 52 and the supporting platform 3. As shown in Figure 11, the lower clamping finger 220 of the waiting three-finger clamp 22 rotates around the lower hinge axis 223 to a vertically downward state, thus releasing the PU middle layer substrate 13. The PU middle layer substrate 13 then falls onto the bottom substrate 9. As shown in Figure 12, the two lower clamping plates 54 rotate around the corresponding first hinge axis 53 to a horizontal state, thereby causing the two extended misaligned horizontal plates 57 to press onto the left and right sides of the PU middle layer substrate 13 respectively. The double-layer clamping device 5 then clamps the PU middle layer substrate 13 and the bottom substrate 9 between the misaligned horizontal plates 57 and the horizontal support plates 52. As shown in Figure 13, the middle finger 221 of the three-finger clamp 22 rotates around the central hinge axis 224 to face vertically downwards, thereby releasing the top substrate 26. Since the top substrate 26 is wider than the PU middle substrate 13 in the left-right direction, the left and right sides of the top substrate 26 fall onto the two lower clamping plates 54 and are supported by them. As shown in Figure 14, the upper clamping plate 56 rotates around the second hinge axis 55 to a lateral position to press down on the side of the top substrate 26. The upper clamping plate 56 and the lower clamping plate 54 together act as grippers to clamp the top substrate 26 between the upper clamping plate 56 and the lower clamping plate 54. In this state, a second gap 41 is left between the top substrate 26 and the PU middle substrate to prevent them from bonding during transportation. As shown in Figure 15, the two front and rear sliders 45 move forward synchronously to both sides of the lower mold 1, so that the top substrate 26, the PU middle substrate 13 and the bottom substrate 9 are brought to the top of the lower mold 1. The horizontal support plate 52 is driven by the clamping vertical cylinder 51 to move down until the PU middle substrate 13 and the bottom substrate 9 are placed on the lower mold 1. As shown in Figure 16, the misaligned horizontal plate 57 is driven by the micro cylinder to retract into the lower clamping plate 54, thereby moving away from the side of the PU middle substrate 13 to avoid it. The upper clamping plate 56 and the lower clamping plate 54 are driven by the upper and lower sliders 58 to move down until the lower clamping plate 54 passes over the side of the PU middle substrate 13, thereby sticking the top substrate 26, which is in a taut state, to the top wall of the PU substrate. The upper clamping plate 56 and the lower clamping plate 54 maintain the clamping of the top substrate 26 so that it remains taut. The upper mold 2 moves down to hot press the taut top substrate 26, PU middle substrate 13 and bottom substrate 9 into shape. During the hot pressing process, the top substrate 26 will not shrink because it is in a taut state. Although the bottom substrate 9 will shrink during the hot pressing process, it will not be exposed because it is subsequently adhered to the roof of the car body. Therefore, the shrinkage will not affect the appearance of the car roof.

[0030] The above description is merely an embodiment of the present invention and does not limit the scope of patent protection. Any non-substantial changes or substitutions made by those skilled in the art based on the present invention will still fall within the scope of patent protection.

Claims

1. A two-step wet production line for anti-wrinkle automotive headliners, characterized in that: The system includes two parallel front and rear transverse first tracks (4), with two forward-moving front and rear sliders (45) mounted on the rear ends of their inner sidewalls. Each of the two front and rear sliders (45) has a liftable upper and lower slider (58) mounted on the upper part of its inner sidewall. The inner sidewalls of the two upper and lower sliders (58) are equipped with two horizontally opposing jaws, which clamp the left and right sides of the top substrate (26) between their respective upper and lower clamping plates. The bottom of the inner sidewall of the lower clamping plate (54) of the two jaws is equipped with two staggered horizontal plates (57). The lower inner side of the two front and rear sliders (45) is equipped with two horizontal support plates (52), which are located directly below the two staggered horizontal plates (57). The two staggered horizontal plates (57) and the two horizontal support plates (52) together clamp the left and right sides of the PU middle layer substrate (13) and the bottom layer substrate (9). The two staggered horizontal plates (57) can be horizontally... The upper mold (2) and the lower mold (1) are provided between the front of the two first tracks (4). The two grippers and the two horizontal support plates (52) are driven by the corresponding front and rear sliders (45) to move forward synchronously until the top, middle and bottom substrates are sent to the top wall of the lower mold (1). The two horizontal support plates (52) move down to place the PU middle substrate (13) and the bottom substrate (9) on the lower mold (1). The two staggered horizontal plates (57) are retracted into the corresponding lower mold (54) to leave the edge of the PU middle substrate (13). The lower mold (54) is driven by the upper and lower sliders (58) to move down past the PU middle substrate (13) so that the top substrate (26) in the taut state is bonded to the top wall of the PU middle substrate (13). The upper mold (2) presses the top substrate (26) in the taut state onto the top wall of the PU middle substrate (13).

2. The two-step wet production line for anti-wrinkle automotive headliners as described in claim 1, characterized in that: A support platform (3) flush with the top wall is provided between the two horizontal support plates (52). A bottom substrate conveyor belt (7) with the bottom substrate (9) placed is provided behind the support platform (3). The rear of the top wall of the support platform (3) is a transfer station (31). A clamping platform (30) is provided on the left side of the transfer station (31). A middle substrate conveyor belt (12) with the middle substrate (13) placed is provided in front of the clamping platform (30). A top substrate (9) is provided behind the clamping platform (30). The top substrate conveyor belt (23) of the top substrate (26) is equipped with two three-finger grippers (22) on the left and right sides above the gripping platform (30), which can be moved laterally to the transfer station (31). Each three-finger gripper (22) has three horizontal gripping fingers: upper, middle, and lower. The top substrate conveyor belt (23) delivers the top substrate (26) to the gripping platform (30). The two three-finger grippers (22) clamp the left and right sides of the top substrate (26) between their respective upper and middle gripping fingers. The substrate conveyor belt (12) delivers the middle substrate (13) to the clamping platform (30). The left and right three-finger clamps (22) clamp the left and right sides of the middle substrate (13) between their respective middle and lower clamping fingers. The left and right three-finger clamps (22) move laterally above the transfer station (31). The bottom substrate conveyor belt (7) delivers the bottom substrate (9) to the transfer station (31) where it is supported by two horizontal support plates (52). The left and right three-finger clamps (22) each... The lower clamping finger (220) loosens the middle layer substrate (13) onto the bottom layer substrate (9). Then, the two staggered horizontal plates (57) and the two horizontal support plates (52) together clamp the left and right sides of the PU middle layer substrate (13) and the bottom layer substrate (9). The middle clamping finger (221) of the left and right three-finger clamps (22) loosens the top layer substrate (26) and hands it over to the two lower clamping plates (54) for support. Then, the two clamping claws clamp the left and right sides of the top layer substrate (26) between the upper and lower clamping plates respectively.

3. A two-step wet process for preventing wrinkles in automotive headliners, characterized in that: Using the anti-wrinkle automotive roof two-step wet production line as described in claim 2, this process includes the following steps: Step 1, the left and right three-finger clamps (22) clamp the left and right sides of the top substrate (26) between their respective upper and middle clamping fingers, and clamp the left and right sides of the middle substrate (13) between their respective middle and lower clamping fingers; Step 2, the two three-finger clamps (22) are moved above the two horizontal support plates (52), and the bottom substrate conveyor belt (7) delivers the bottom substrate (9) to the horizontal support plate (52); the upper and lower clamping plates of the two clamps are positioned In the vertical position, the lower clamping fingers (220) of the two left and right three-finger clamps (22) loosen the middle layer substrate (13) and place it onto the bottom layer substrate (9); in the third step, the two lower clamping plates (54) together with the two staggered horizontal plates (57) rotate inward to the horizontal position, so that the two staggered horizontal plates (57) press the left and right sides of the PU middle layer substrate (13) and the bottom layer substrate (9) onto the two horizontal support plates (52) respectively; in the fourth step, the middle clamping fingers (221) of the two left and right three-finger clamps (22) loosen the top layer substrate (26), and then the top layer substrate (26) The material falls over the two upper clamping plates (56) in the vertical position and then onto the two lower clamping plates (54) in the horizontal position. The two upper clamping plates (56) rotate inward to the horizontal position, thereby pressing the left and right edges of the top substrate (26) onto the two lower clamping plates (54) respectively. In step five, the upper clamping plates (56), lower clamping plates (54) and horizontal support plates (52) simultaneously feed the top substrate (26), middle substrate (13) and bottom substrate (9) into the lower mold (1). The two horizontal support plates (52) move down, thereby pressing the middle substrate (13) and bottom substrate (9) onto the mold. Step 6: Each misaligned horizontal plate (57) is retracted into the lower clamping plate (54) and thus moves away from the edge of the middle substrate (13). Each upper clamping plate (56) and lower clamping plate (54) moves down from the corresponding side of the middle substrate (13) and passes over the top wall of the middle substrate (13) to stick the top substrate (26) in the taut state to the top wall of the middle substrate (13). Step 7: The upper mold (2) moves down to hot press the top substrate (26) in the taut state, the middle substrate (13) in the relaxed state, and the bottom substrate (9) into shape.

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