Constant-pressure type film coating mechanism and production line

Abstract

The application discloses a constant-pressure film covering mechanism and production line, relates to the film covering technical field, and comprises a conveying belt group for conveying a film covering object, a hot-pressing roller for pressing a film on the surface of the film covering object, a cylinder rotatably arranged, a plurality of flexible inclined rib rings arranged on the cylinder, and a lower holding shaft axially reciprocally moving in rolling connection with the film covering object and in abutting connection with the film. The constant-pressure film covering mechanism and production line are characterized in that the curved surface of the wave seat is slidably matched with the jacking rod, the cylinder arranged on the roller shell is synchronously rotated with the main shaft and axially reciprocally moved, the flexible inclined rib rings arranged on the surface of the cylinder are symmetrically arranged, the directional bubble arrangement is realized, the residual micro-bubbles between layers are removed, the quick cooling and shaping of the cooling roller group are matched, the film cooling rebound and wrinkle are avoided, and the re-pasting and edge lifting failure rate in the subsequent winding and stacking process is obviously reduced.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a constant pressure coating mechanism and production line. Background Technology

[0002] Lamination is a core processing technology in the post-printing field. Its standard operating procedure is usually as follows: after unwinding, flattening and traction alignment of the plastic film coated with adhesive and the paper printed matter, the two are bonded together by heating and pressing with hot rollers, and then cooled, shaped, rolled up or cut to obtain the finished product.

[0003] The present invention relates to the field of devices for lamination of aluminum-based copper clad laminates, specifically an automatic lamination device for aluminum-based copper clad laminates, disclosed in publication number CN119160461B on March 4, 2025. The defoaming mechanism includes: control rods rotatably connected to a frame mechanism; a movable frame threadedly connected to the reciprocating threads of each control rod; a movable frame slidably connected to the movable frame; a pressure roller assembly rotatably connected to the movable frame; a grooved plate fixedly connected to the frame mechanism; and a guide shaft fixedly connected to the movable frame. The present invention features a pressure roller assembly capable of moving along a specific track from the center to both sides, allowing the pressure roller assembly to expel air bubbles from the center to both sides, thus improving the defoaming effect of the present invention on aluminum-based copper clad laminates and minimizing residual air bubbles. Furthermore, the invention employs a combination of large and small pressure rollers for defoaming, with the small pressure roller contacting the air bubbles first, thereby segmenting and refining the bubbles before elimination, improving the air bubble handling capacity of the pressure roller assembly, and further enhancing the defoaming effect of the present invention on aluminum-based copper clad laminates.

[0004] The shortcomings of the existing technology mentioned above are that the current re-pressing structure relies solely on the rolling pressing of the rollers, which cannot effectively remove the micro-bubbles remaining between layers after hot pressing. The film is prone to wrinkling, rewinding, stacking and re-lamination problems due to cooling and rebound. Summary of the Invention

[0005] The purpose of this invention is to provide a constant pressure coating mechanism and production line to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A constant pressure coating mechanism includes a conveyor belt assembly for conveying a workpiece to be coated, a hot press roller for pressing the passing coating onto the surface of the workpiece, and a rotatably mounted cylinder with a plurality of flexible inclined ribs on the cylinder. The inclined ribs are in rolling connection with the coating on the workpiece and are driven to maintain axial reciprocating movement.

[0007] As a further description of the above technical solution: each of the multiple inclined rib rings with the same orientation forms a group, and there are two groups in total. The ports of the inclined rib rings in the two groups face opposite directions and are directed toward both ends of the cylinder.

[0008] As a further description of the above technical solution: the inclined prism ring is a bowl-shaped truncated cone structure.

[0009] As a further description of the above technical solution: the two adjacent inclined prisms do not overlap.

[0010] As a further description of the above technical solution: the top of the large-diameter end section of the inclined prism facing the outside of the equipment is provided with a thickened arc head.

[0011] As a further description of the above technical solution, it also includes: a second bearing seat that slides vertically, a main shaft that is rotatably mounted on the second bearing seat, the cylinder being slidably mounted on the main shaft, and an elastic element that is assembled on the second bearing seat to keep the leveling cylinder in a vertically low position.

[0012] As a further description of the above technical solution: a wave seat is fixedly provided on the bearing seat 2, and a top rod is provided at the end of the cylinder body in a sliding connection with the wave-shaped end face of the wave seat.

[0013] As a further description of the above technical solution: it also includes a drive motor for driving the hot press roller and the main shaft to rotate synchronously in the circumferential direction.

[0014] As a further description of the above technical solution: it also includes a linkage mechanism, which includes two connecting gears B, the connecting gears B being fixedly mounted on the main shaft and the hot press roller respectively, and connecting rods being rotatably mounted on both the main shaft and the hot press roller, and a horizontal shaft being rotatably mounted on the other end of the connecting rods, and a connecting gear A being fixedly mounted on the horizontal shaft, the connecting gear A meshing with the two connecting gears B.

[0015] A production line for a paper constant pressure laminating mechanism includes the constant pressure laminating mechanism described above. In the above technical solution, the constant pressure coating mechanism and production line provided by the present invention, through the curved sliding cooperation between the top rod and the wave seat, drives the cylinder sleeved on the roller shell to rotate synchronously with the main shaft and generate axial reciprocating movement. With the flexible inclined rib rings symmetrically arranged on the surface of the cylinder, directional de-bubbling is achieved, and residual micro-bubbles between layers are removed. Combined with the rapid cooling and shaping effect of the cooling roller group, the film is prevented from cooling and rebounding and wrinkling, which significantly reduces the re-lamination and edge curling defect rate in the subsequent winding and stacking process. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is a schematic diagram of the structure provided for an embodiment of the present invention; Figure 2 This is a schematic diagram of the hot pressing mechanism and the double-pressing mechanism provided in an embodiment of the present invention; Figure 3 Provided for embodiments of the present invention Figure 2 Enlarged structural diagram at point A; Figure 4 Provided for embodiments of the present invention Figure 2 Enlarged structural diagram at point B; Figure 5 This is a schematic diagram of the structure of the cooling roller assembly provided in an embodiment of the present invention; Figure 6 Provided for embodiments of the present invention Figure 5 Enlarged structural diagram at point C; Figure 7 This is a schematic diagram of the structure of the leveling cylinder section provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the wave seat provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the partial cross-section of the inclined prism ring provided in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Laminating machine body; 2. Conveyor belt assembly; 3. Material roller; 4. Hot pressing mechanism; 41. Bearing seat one; 42. Guide seat one; 43. Cylinder; 44. Hot pressing roller; 5. Re-pressing mechanism; 51. Bearing seat two; 511. Guide rod; 52. Guide seat two; 53. Elastic element; 54. Cooling roller assembly; 541. Main shaft; 542. Spline gear; 543. Roller shell; 6. Leveling cylinder; 61. Cylinder body; 62. Inclined rib ring; 63. Spline sleeve; 7. Linkage mechanism; 71. Horizontal shaft; 711. Connecting gear A; 72. Connecting gear B; 73. Connecting rod; 8. Push rod; 9. Wave seat; 10. Return spring. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Please see Figures 1-9This invention provides a technical solution: a constant pressure coating mechanism, including a conveyor belt group 2 for conveying the parts to be coated, and a hot press roller 44 for pressing the passing coating onto the surface of the parts to be coated, and further including: a rotatably disposed cylinder 61, on which a plurality of flexible inclined ribs 62 are disposed, and the inclined ribs 62 are in rolling connection with the coating attached to the parts to be coated, and maintain axial reciprocating movement under drive, and further including: a second bearing seat 51 that slides in the vertical direction, on which a main shaft 541 is rotatably disposed, the cylinder 61 is slidably disposed on the main shaft 541, and an elastic element 53 is assembled on the second bearing seat 51, which is used to keep the leveling cylinder 6 in a vertical low position.

[0021] Specifically, it also includes a laminating machine body 1 and a material roller 3 rotatably mounted on the laminating machine body 1. A conveyor belt group 2 is mounted on the laminating machine body 1. A hot pressing mechanism 4 is mounted on the laminating machine body 1. The hot pressing mechanism 4 includes a cylinder 43 and a guide seat 42 symmetrically mounted on the laminating machine body 1. The output end of the cylinder 43 is slidably mounted through the guide seat 42. A bearing seat 41 is fixedly mounted on the output end of the cylinder 43. The hot pressing roller 44 is rotatably mounted on the bearing seat 41. The hot pressing roller 44 is connected to a drive motor. The material roller 3 is used to continuously release the coating substrate, and is synchronized with the material feeding speed of the conveyor belt group 2 to ensure stable coating tension. The cylinder 43 is the pressure-applying element of the hot press roller 44. The output pressure is not affected by the piston rod stroke, and can adaptively adapt to the thickness fluctuation of the coating. With the vertical guidance constraint of the guide seat 42, it ensures that the bearing seat 41 is free from swaying during the lifting process, so that the pressure distribution of the hot press roller 44 is uniform across the entire width, avoiding the difference in bonding firmness and air bubble residue caused by uneven pressure on one side. At the same time, the roller body can be quickly lifted to facilitate material feeding, roller changing and daily maintenance operations.

[0022] Furthermore, a repressing mechanism 5 is provided on the discharge side of the hot pressing mechanism 4. The repressing mechanism 5 includes a bearing seat 51 slidably mounted on the main body 1 of the laminating machine. A guide seat 52 is symmetrically fixed on the main body 1 of the laminating machine. A guide rod 511 is slidably mounted in the guide seat 52. The bearing seat 51 is fixedly mounted on the guide rod 511. An elastic element 53 is sleeved on the guide rod 511. Both ends of the elastic element 53 are connected to the guide seat 52 and the bearing seat 51, respectively. A cooling roller assembly 54 is rotatably mounted on the bearing seat 51. The cooling roller assembly 54 includes a main shaft 541 rotatably mounted on the bearing seat 51. A roller shell 543 is provided on the bearing seat 51. Spline teeth 542 are provided at both ends of the bearing seat 51. The sliding fit between guide rod 511 and guide seat 52 provides precise vertical floating guidance for bearing seat 51, preventing lateral movement of the roller. The elastic element 53 continuously provides stable downward pressure, ensuring that the cooling roller group 54 always adheres to the coating surface with constant pressure, unaffected by slight changes in the thickness of the coating material or joint impact, achieving constant pressure and repressurization. The roller shell 543 has a built-in circulating cooling channel, which can quickly remove the residual heat of the film layer after hot pressing, allowing the coating adhesive layer to cool and solidify rapidly, preventing the tilting ring 62 from rubbing against the coating during reciprocating movement and causing continuous heat generation, thus preventing adhesion, lifting, and re-coating defects due to incomplete cooling of the film layer during subsequent winding and stacking. The spline teeth 542 at both ends have dual functions of circumferential transmission and axial sliding guidance, providing structural support for the synchronous rotation and reciprocating bubble removal action of the leveling cylinder 6.

[0023] A leveling cylinder 6 is slidably mounted on the cooling roller assembly 54. The leveling cylinder 6 consists of a cylinder body 61 and an inclined rib ring 62. The cylinder body 61 is slidably mounted on the roller shell 543. Spline sleeves 63 are fixedly mounted at the axial positions at both ends of the cylinder body 61. The spline sleeves 63 are slidably connected to the main shaft 541 through spline teeth 542. The cylinder 61 is sleeved on the outside of the roller shell 543. Return springs 10 are installed between the two ends of the roller shell 543 and the inner wall of the cylinder 61. The return springs 10 assist in pushing the cylinder 61 to reciprocate along the roller shell 543 axially. It can obtain a stable cooling temperature by relying on the roller shell 543 to ensure that the film layer is in a controllable softening state during the kneading and defoaming process. It can also independently complete the axial reciprocating action without affecting the main transmission of the cooling roller group 54. The spline sleeve 63 and the spline teeth 542 have high transmission precision and strong load-bearing capacity. They can still maintain complete circumferential synchronization under high-speed axial reciprocating sliding conditions, eliminating the problem of relative rotation and slippage between the cylinder 61 and the main shaft 541. This ensures that the defoaming action of the inclined ring 62 is precisely matched with the overall material feeding speed, and the defoaming effect is consistent under different production rates.

[0024] In another embodiment of the present invention, each of the multiple inclined rib rings 62 with the same orientation forms a group, and there are two groups in total. The ports of the two groups of inclined rib rings 62 face opposite directions and face both ends of the cylinder 61. The inclined rib rings 62 have a bowl-shaped truncated cone structure, and two adjacent inclined rib rings 62 do not overlap each other. Their roots maintain a distance of 0.5mm to 2mm. The top of the large-diameter end section of the inclined rib rings 62 facing the outside of the equipment is provided with a thickened arc head. Two sets of symmetrically arranged bowl-shaped truncated cone structures can apply a directional pushing force from the center to the two side edges to the film layer as the cylinder 61 rotates and reciprocates axially. When the cylinder 61 moves to one side, the thickened arc protrusion of the inclined rib ring 62 fully contacts and engages with the film that has just been softened by hot pressing, which will push the film layer and interlayer bubbles to migrate outward synchronously. When the cylinder 61 moves back, it contacts the smooth back slope of the inclined rib ring 62, which greatly reduces the friction. The bubbles and softened adhesive layer will not move with the roller body, which is equivalent to the effect of "one-way slippage". This avoids bringing the bubbles back and continuously drives the micron-sized bubbles remaining after hot pressing to the edge of the product for discharge, while preventing the bubbles from moving back and forth in the film layer. The thickened arc protrusion at the large diameter end can increase the compaction pressure in the edge area, strengthen the air release effect and adhesion of the product edge, and the flexible material will not scratch the special coating surfaces such as high-gloss film and laser film, adapting to the needs of various color printing and lamination processes.

[0025] In another embodiment of the present invention, a wave seat 9 is fixedly disposed on the bearing housing 51, and a push rod 8 is slidably connected to the wave-shaped end face of the wave seat 9 at the end of the cylinder 61. Specifically, the push rods 8 are arrayed at both ends of the cylinder 61, and the ends of the push rods 8 are provided with universal balls. The end faces of the two wave seats 9 that are disposed opposite each other are processed with a continuously undulating wave structure surface. The curved surfaces of the two wave structures are disposed opposite each other in a form of mutual contact, and the push rods 8 are slidably disposed on the wave structure surface of the wave seat 9 through universal balls. The fixedly installed wave seat 9 and the push rod 8 that rotates synchronously with the cylinder 61 cooperate with each other to automatically convert the circumferential rotation of the cylinder 61 into axial reciprocating motion in a purely mechanical manner. There is no need to configure an independent drive motor and electrical control system, which simplifies the overall transmission structure and reduces equipment costs and failure rates. The multiple push rods 8 arranged in an array are evenly stressed, which can prevent the cylinder 61 from skewing and jamming during reciprocating sliding, ensuring smooth operation. The universal ball at the end of the push rod 8 can convert sliding friction into rolling friction, which greatly reduces the wear of the wave surface, extends the service life of the mechanism, and reduces operating noise, making it suitable for long-term continuous production conditions in printing workshops.

[0026] In another embodiment of the present invention, the linkage mechanism 7 includes two connecting gears B72, which are respectively fixedly mounted on the main shaft 541 and the hot pressing roller 44. A connecting rod 73 is rotatably mounted on both the main shaft 541 and the hot pressing roller 44. A horizontal shaft 71 is rotatably mounted on the other end of each connecting rod 73. A connecting gear A711 is fixedly mounted on the horizontal shaft 71, and the connecting gear A711 meshes with the two connecting gears B72. Specifically, the linkage mechanism 7 is located between the cooling roller assembly 54 and the hot pressing mechanism 4. The linkage mechanism 7, composed of two connecting rods 73 and connecting gears A711 and B72, has the ability to adaptively compensate for the center distance: when the hot press roller 44 is adjusted for pressure and lifting, or when the bearing seat 2 51 floats vertically, causing a change in the center distance between the two rollers, the two connecting rods 73 can automatically swing to adjust the spatial position of the horizontal shaft 71, so that the connecting gear A711 and the connecting gears B72 on both sides always maintain precise meshing, without any problems of tooth disengagement or jamming, perfectly adapting to the constant pressure floating requirements of the repressing station; the pure gear rigid transmission can ensure that the transmission ratio between the hot press roller 44 and the main shaft 541 is constant, achieving complete synchronization of the linear speeds of the hot press and repressing stations, avoiding defects such as film stretching, wrinkles, and surface dragging caused by speed differences, while ensuring that the reciprocating defoaming frequency of the leveling cylinder 6 is precisely linked with the material feeding speed, ensuring a stable and consistent defoaming effect under different production speeds.

[0027] It should be noted that the working process of the constant pressure coating mechanism is as follows: After the equipment is started, the conveyor belt group 2 carries the parts to be coated and conveys them forward at a constant speed in the main body 1 of the coating machine. The material roller 3 releases the coating substrate at the same time, and the two are sent into the hot pressing mechanism 4 together. The cylinder 43 pushes the bearing seat 41 down along the guide seat 42, which drives the hot pressing roller 44 to press the coating onto the surface of the parts to be coated with a set pressure, thus completing the main bonding process. After hot pressing, the coated product enters the repressing mechanism 5 on the discharge side via conveyor belt group 2. The elastic element 53 pushes the cooling roller group 54 to press against the product surface under constant pressure through bearing seat 2 51, and the roller shell 543 simultaneously cools and shapes the film layer. The linkage mechanism 7 transmits the power of the hot pressing roller 44 to the main shaft 541. Through the cooperation of the spline tooth 542 and the spline sleeve 63, the cylinder 61 rotates synchronously with the roller shell 543. During the rotation, the push rod 8 at the end of the cylinder 61 slides continuously along the wave surface of the wave seat 9 fixed on the bearing seat 2 51 with a universal ball. With the help of the reset elastic force, the cylinder 61 moves back and forth axially along the main shaft 541, so that the flexible inclined rib ring 62 on the surface of the cylinder 61 forms a "rolling pressing and axial directional rubbing" compound effect on the film layer, continuously pushing the residual air bubbles between the layers from the middle to the two sides and discharged. Finally, the coated product, after degassing, compaction, cooling and shaping, is output with conveyor belt group 2, completing the entire coating process.

[0028] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A constant pressure coating mechanism, comprising: The conveyor belt assembly (2) for conveying the film to be coated is characterized by a hot press roller (44) for pressing the film onto the surface of the film to be coated. The roller is characterized by including a rotatable cylinder (61) on which a plurality of flexible inclined ribs (62) are provided. The inclined ribs (62) are in rolling connection with the film on the film to be coated and are driven to maintain axial reciprocating movement.

2. The constant pressure coating mechanism according to claim 1, characterized in that: Each of the multiple inclined ribs (62) with the same orientation forms a group, and there are two groups in total. The ports of the two groups of inclined ribs (62) face opposite directions and are directed toward the two ends of the cylinder (61).

3. The constant pressure coating mechanism according to claim 2, characterized in that: The inclined prism (62) has a bowl-shaped truncated cone structure.

4. A constant pressure coating mechanism according to claim 2, characterized in that: The two adjacent inclined rib rings (62) do not overlap.

5. A constant pressure coating mechanism according to claim 2, characterized in that: The inclined rib ring (62) has a thickened arc protrusion at the top of the large-diameter end section facing the outside of the equipment.

6. The constant pressure coating mechanism according to claim 1, characterized in that: Also includes: A bearing seat 2 (51) that slides vertically is provided with a main shaft (541) rotatably mounted on the bearing seat 2 (51), and the cylinder (61) is slidably mounted on the main shaft (541). An elastic element (53) is assembled on the bearing seat 2 (51) to keep the leveling cylinder (6) in a vertical low position.

7. The constant pressure coating mechanism according to claim 1, characterized in that: A wave seat (9) is fixedly installed on the bearing seat 2 (51), and a top rod (8) is provided at the end of the cylinder (61) in a sliding connection with the wave-shaped end face of the wave seat (9).

8. A constant pressure coating mechanism according to claim 1, characterized in that: It also includes a drive motor for keeping the hot press roller (44) and the main shaft (541) rotating synchronously in the circumferential direction.

9. A constant pressure coating mechanism according to claim 5, characterized in that: It also includes a linkage mechanism (7), which includes two connecting gears B (72). The connecting gears B (72) are fixedly mounted on the main shaft (541) and the hot press roller (44), respectively. A connecting rod (73) is rotatably mounted on both the main shaft (541) and the hot press roller (44). A horizontal shaft (71) is rotatably mounted on the other end of the connecting rod (73). A connecting gear A (711) is fixedly mounted on the horizontal shaft (71). The connecting gear A (711) meshes with the two connecting gears B (72).

10. A production line for a paper constant pressure coating mechanism, characterized in that, Includes the constant pressure coating mechanism as described in any one of claims 1-9 above.

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