A molding device and its process

Abstract

This invention discloses a molding device and its process, including a pressure roller with heat-conducting oil circulating inside. The pressure roller can rotate around its axis, and a pressure plate is installed on its outer wall. The outer wall of the pressure plate has graphic information. The pressure plate can rotate with the pressure roller. A base plate is provided below the pressure roller and can move up and down. A membrane is provided on the outer wall of the base plate, wrapping around the top of the base plate. The inner wall of the membrane is in contact with the outer wall of the base plate and can move along the outer wall of the base plate. One end of the pressure plate has a pressing opening located at the end in the direction of rotation of the pressure plate. The bottom surface of the pressing opening can be in contact with the top surface of the membrane. The device also includes a lifting assembly, which includes a lifting wheel that can move up and down. The membrane wraps around the bottom of the lifting wheel. A fixing block is provided above the lifting wheel, and a spring is provided between the fixing block and the lifting wheel. The lower end of the spring abuts against the upper end of the lifting wheel, and the upper end of the spring abuts against the lower end of the fixing block. This invention reduces the gap width generated during the molding process through effective positioning.

Description

Technical Field

[0001] This invention relates to the field of molding technology, and in particular to a molding apparatus and its process. Background Technology

[0002] like Figure 1-3 As shown, in the current molding process of film, the pressure roller 100 is set above the film 300, and the outer wall of the pressure roller 100 is fixed with a pressing plate 200. The pressing plate 200 has graphic information. The pressure roller 100 drives the pressing plate 200 to rotate. After the upper end of the film 300 is coated, it enters the area below the pressing plate 200. The graphic information on the pressing plate 200 is pressed into the coating of the film 300, so that the graphic information is formed on the surface of the film 300.

[0003] When the pressure plate 200 contacts the film 300 for molding, the pressure plate 200 rotates and the film 300 is moved and transported synchronously. When the pressure plate 200 separates from the film 300, the film 300 stops transporting. When the pressure plate 200 rotates and contacts the film 300 again, the film 300 is transported again.

[0004] During the molding process of the film 300 by the pressure plate 200, the corresponding points on the film 300 and the pressure plate 200 move synchronously to ensure that the pattern on the molded film 300 is consistent with that on the pressure plate 200. However, the pressure plate 200 is usually arc-shaped rather than a complete circle. Figure 2 As shown, when the tail of the pressure plate 200 leaves the film 300, the film 300 stops moving, as... Figure 3 As shown, when the pressing plate 200 rotates to the position shown, the pressing plate 200 presses the film 300 again. However, the joint section between the two pressings, i.e. the gap section 3001, cannot be pressed, resulting in a gap. At the same time, it is affected by tension and pressing temperature. If the gap section 3001 is too large, it will have a significant impact on the appearance of the product. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a molding device and process that reduces the gap width generated during the molding process through effective positioning.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A molding device includes a pressure roller, a pressure roller with heat-conducting oil flowing inside it, the pressure roller being rotatable around its axis, a pressure plate mounted on the outer wall of the pressure roller, the outer wall of the pressure plate having graphic information, the pressure plate being rotatable with the pressure roller, a base plate being disposed below the pressure roller, the base plate being movable up and down, a membrane being disposed on the outer wall of the base plate, the membrane wrapping around the top of the base plate, the inner wall surface of the membrane being in contact with the outer wall surface of the base plate, the membrane being movable along the outer wall of the base plate, and a pressing opening being provided at one end of the pressure plate, the pressing opening being located at the end of the pressure plate in the direction of rotation, the bottom surface of the pressing opening being in contact with the top surface of the membrane.

[0008] It also includes a lifting assembly, which includes a lifting wheel that can move up and down. The membrane passes around the bottom of the lifting wheel, and a fixing block is provided above the lifting wheel. A spring is provided between the fixing block and the lifting wheel, with the lower end of the spring abutting against the upper end of the lifting wheel and the upper end of the spring abutting against the lower end of the fixing block.

[0009] The bottom surface of the pressure port is arc-shaped, and its curvature matches the outer wall of the upper end of the membrane.

[0010] The base plate is provided with a slide hole, and a slider is slidably connected to the slide hole. The slider can move up and down along the slide hole. An elastic pad is provided at the upper end of the slide hole. When the slider moves upward, it can resist the elastic pad and push the base plate upward.

[0011] The top of the base plate is arc-shaped and its radius is smaller than that of the pressure plate.

[0012] A molding process using a molding apparatus, comprising a molding apparatus, wherein the molding process is as follows:

[0013] ① The pressure roller is equipped with a pressure plate end. The pressure roller drives the pressure plate to rotate until the pressure plate end contacts one side of the film. The pressure plate molds the film, and the film moves under the winding action of the take-up roller.

[0014] ②The winding roller stops winding, the film stops moving, the pressure plate continues to rotate until the lower part of the pressure port is directly opposite the film located on the top of the base plate, the pressure plate roller stops rotating, the slider continues to move upward and pushes the base plate upward, and the pressure port completes the molding of the film on the top of the base plate;

[0015] ③ The slider moves downward under the action of the cylinder, the slider separates from the elastic pad, the base plate moves downward under the action of the lifting wheel, and the slider moves to the lower limit position.

[0016] In the initial position, the slider is located below the elastic pad, and there is a gap between the slider and the elastic pad.

[0017] In the initial position, the spring is in a free state. When the pressure port and the membrane on the top of the base plate come close to each other and just touch, the spring just abuts against the fixed block and the lifting wheel from the top and bottom respectively.

[0018] When the pressure port presses the film on the top of the base plate, both the pressure plate and the film remain fixed.

[0019] After the slider moves downward, the lifting wheel pulls the membrane down so that the pressure port part separates from the membrane on the top of the base plate.

[0020] The pressure plate has a notch, which is located on the side of the pressure opening near the end of the pressure plate.

[0021] The beneficial effects of this invention are:

[0022] By setting a pressure port and reducing the maximum contact length between the film and the pressure plate during molding, the gap formed on the film after two molding processes (i.e., the unmolded part) is reduced, which helps to meet the appearance quality requirements of molding.

[0023] The slider and base plate are separated to prevent the sudden change in membrane tension when the slider descends, which could cause the membrane to shrink at the molding position and result in molding quality problems.

[0024] The spring mechanism ensures that during the upward movement of the lifting roller, specifically as the membrane rises near the pressure port, the roller experiences resistance. This prevents the roller from surging upwards due to inertia, thus stabilizing the membrane tension at a suitable level. Maintaining a suitable tension value is beneficial for the molding operation. Furthermore, when the membrane separates from the pressure port and the top of the base plate after molding, the spring force, together with the lifting roller, pulls the membrane downwards. Therefore, the membrane also maintains a stable tension value during separation from the pressure port and the top of the base plate. Attached Figure Description

[0025] Figure 1 Illustration of background technology Figure 1 ;

[0026] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 Illustration of background technology Figure 2 ;

[0028] Figure 4 This is a cross-sectional view of an embodiment;

[0029] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0030] Figure 6 The positional relationship between the pressure plate and the membrane in the embodiment Figure 1 ;

[0031] Figure 7 The positional relationship between the pressure plate and the membrane in the embodiment Figure 2 .

[0032] In the figure: 1. Pressure roller, 2. Pressure plate, 21. Notch 1, 211. Side wall of notch, 22. Pressing part, 23. End of pressure plate, 3. Base plate, 3. Slide hole, 31. Membrane, 5. Lifting assembly, 51. Lifting wheel, 52. Fixing block, 521. Protrusion, 53. Spring, 6. Slider, 7. Guide wheel, 8. Rewinding wheel, 9. Elastic pad, 10. Fixing plate, 10. Pressure roller, 100. Pressing plate, 200. Film, 300. Gap section, 3001. Detailed Implementation

[0033] The technical solution of the present invention will be further described below through embodiments and in conjunction with the accompanying drawings.

[0034] like Figures 4-7 As shown, a molding device includes a pressure roller 1, which is filled with heat-conducting oil and can rotate around its axis. A pressure plate 2 for molding a film 4 is mounted on the outer wall of the pressure roller 1. The film 4 is a thin film product (such as laser film). Figure 4 As shown, the membrane 4 passes through the top of the left guide wheel 7, the bottom of the left lifting wheel 51, the top of the base plate 3, the bottom of the right lifting wheel 51, and the top of the right guide wheel 7, and is finally wound up by the winding wheel 8.

[0035] The outer wall of the pressure plate 2 is provided with graphic information. The pressure plate 2 is a thin arc-shaped plate. The inner wall of the pressure plate 2 is fitted to the outer wall of the pressure roller 1. The pressure plate 2 can rotate with the pressure roller 1. When the pressure plate 2 rotates, it forms a molding on the top of the base plate 3. The heat transfer oil in the pressure roller 1 can heat the pressure plate 2 to facilitate the molding operation.

[0036] The take-up roller 8 is the driving roller. When the pressure plate 2 comes into contact with the film 4, the film 4 moves under the drive of the take-up roller 8.

[0037] The pressure roller 1 and the winding roller 8 are both controlled to rotate by a servo system.

[0038] The base plate 3 is located below the pressure roller 1 and can move up and down. Specifically, a fixing plate 10 is attached to the bottom surface of the base plate 3 and remains fixed. The upper surface of the fixing plate 10 is attached to the bottom surface of the base plate 3. A protrusion is provided at the upper end of the fixing plate 10 and inserts upward into the bottom of the base plate 3. The base plate 3 can move up and down along the outer wall of the protrusion of the fixing plate 10. A slide hole 31 is provided at the bottom of the base plate 3 and extends upward along the bottom surface of the base plate 3. A slider 6 is slidably connected and installed in the slide hole 31. The bottom of the slider 6 is driven by a cylinder, and the slider 6 can move up and down along the inner wall of the slide hole 31. An elastic pad 9 is provided at the upper end of the slide hole 31. The elastic pad 9 can be a rubber pad. When the slider 6 moves upward and abuts against the bottom of the elastic pad 9, it can push the base plate 3 upward. When the slider 6 moves downward, it can separate from the elastic pad 9. The bottom of the slider 6 is fixedly connected to the output end of the cylinder.

[0039] The top of the base plate 3 is arc-shaped. The membrane 4 passes over the top of the base plate 3. The inner wall of the membrane 4 is in contact with the outer wall of the top of the base plate 3. Under the action of the winding wheel 8, the membrane 4 can move along the outer wall of the base plate 3. The membrane 4 forms a certain tension when it moves. When the membrane 4 passes the top of the base plate 3, it can be molded by the pressure plate 2.

[0040] The radius of the arc at the top of the base plate 3 is smaller than that of the pressure plate 2, which shortens the maximum contact length between the film 4 and the pressure plate 2 when the pressure plate 2 contacts the film 4 at the top of the base plate 3 for molding. This reduces the gap (i.e. the unmolded part) formed on the film 4 after two molding processes, which helps to meet the appearance quality requirements of molding.

[0041] like Figure 5 , 6 As shown, one end of the pressure plate 2 is provided with a pressure opening 22, and the other end is a pressure plate end 23. The pressure opening 22 is located at the end of the pressure plate 2 in the rotation direction. That is, when molding, the pressure plate end 23 is the first to contact the film 4 (i.e., the head), while the pressure opening 22 is the tail.

[0042] like Figure 5 As shown, the bottom surface of the pressing part 22 can be attached to the top surface of the membrane 4. The curvature of the bottom surface of the pressing part 22 is consistent with the curvature of the upper end surface of the membrane 4 on the top of the base plate 3. The bottom surface of the pressing part 22 is provided with graphic information. The pressing part 22 and the membrane 4 on the top of the base plate 3 are pressed together, which allows the pressing part 22 to complete the pressing operation on the membrane 4 on the top of the base plate 3.

[0043] The pressure plate 2 is also provided with a notch 21. The notch 21 is located on the side of the pressure opening 22 near the end 23 of the pressure plate. The notch 21 is used to prevent the pressure plate 2 from interfering with the membrane 4 when the pressure opening 22 and the membrane 4 on the top of the bottom plate 3 are squeezed up and down.

[0044] Lifting components 5 are provided on both sides of the bottom plate 3. The lifting components 5 include lifting wheels 51. The membrane 4 passes around the bottom of the lifting wheel 51. The lifting wheel 51 is supported by the membrane 4 located at its bottom. The lifting wheel 51 can move up and down. The lifting wheel 51 is used to automatically adjust the tension of the membrane 4.

[0045] A fixing block 52 is provided above the lifting wheel 51. The fixing block 52 includes a protrusion 521 at the bottom. A spring 53 is provided between the fixing block 52 and the lifting wheel 51. The spring 53 is fitted into the protrusion 521. The lower end of the spring 53 abuts against the upper end of the lifting wheel 51, and the upper end of the spring 53 abuts against the lower end of the fixing block 52.

[0046] A molding process using a molding apparatus, comprising the aforementioned molding apparatus, wherein the molding process is as follows:

[0047] ①For example Figure 6 As shown, the pressure roller 1 drives the pressure plate 2 to rotate until the end 23 of the pressure plate contacts one side of the film 4. The pressure plate 2 molds the film 4. The film 4 moves under the action of the winding wheel 8. During the molding process between the film 4 and the pressure plate 2, there is no relative displacement between the film 4 and the pressure plate 2 that it is pressed with.

[0048] like Figure 7 As shown, notch 21 includes a sidewall 211, which is located on the side of notch 21 away from the pressure opening 22. Figure 7 As shown, the bottom of the notch sidewall 211 is about to leave the film 4. At this time, the left side of the contact point between the film 4 and the bottom of the notch sidewall 211 (i.e., the film 4 at the top of the base plate 3) has not been molded. Figure 6As shown, when the end 23 of the pressure plate rotates and contacts one side of the film 4 again, it is also impossible to mold the film 4 on the top of the base plate 3, thus creating a gap.

[0049] ②For example Figure 5 As shown, the winding wheel 8 stops winding, the film 4 no longer moves, and the pressure plate 2 continues to rotate until the film 4 is directly below the pressure port 22 and above the top of the base plate 3. Figure 4 As shown, the slider 6 moves upward under the action of the bottom cylinder. In the initial position, there is a gap between the upper end of the slider 6 and the bottom of the elastic pad 9. When the slider 6 moves upward until it touches the bottom of the elastic pad 9, the slider 6 continues to move upward and pushes the base plate 3 upward. The pressure port 22 completes the molding of the film 4 on the top of the base plate 3.

[0050] As the slider 6 presses against the elastic pad 9 and continues upward to complete the molding process, the elastic pad 9 is squeezed and undergoes elastic deformation.

[0051] During the upward movement of block 6, spring 53 is in a free state until the pressure port 22 and the film 4 on the top of the base plate 3 come close to each other and just touch. At this point, spring 53 just abuts against the fixed block 52 and the lifting wheel 51 from above and below. When the pressure port 22 and the film 4 on the top of the base plate 3 are molded, spring 53 is slightly compressed.

[0052] ③ The slider 6 moves downward under the action of the cylinder, the slider 6 separates from the bottom of the elastic pad 9, and the slider 6 moves to the lower limit position.

[0053] Since the slider 6 is not fixed to the base plate 3, at the beginning of the downward movement of the slider 6, the bottom surface of the pressure port 22 has not yet completely separated from the film 4. At this time, under the action of the lifting wheel 51, the film 4 maintains sufficient tension. Therefore, the slider 6 is separated from the base plate 3, which can prevent the sudden change in the tension of the film 4 when the slider 6 descends, which would cause the film 4 to shrink at the molding position and cause molding quality problems.

[0054] The molding depth can be adjusted by adjusting the vertical position of the fixing block 52.

[0055] The spring 53 ensures that during the upward movement of the lifting roller 51, specifically when the membrane 4 rises near the pressure port 22, the lifting roller 51 experiences resistance, preventing it from surging upwards due to inertia. This stabilizes the tension of the membrane 4 at a suitable level, which is beneficial for the molding operation. Furthermore, when the pressure port 22 separates from the top of the base plate 3 after molding, the spring force, together with the lifting roller 51, pulls the membrane 4 downwards. Therefore, even when the pressure port 22 separates from the top of the base plate 3, the membrane 4 remains at a stable tension value.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A moulding apparatus comprising a platen roller (1) through which a heat conducting oil is passed, said platen roller (1) being rotatable about its axis, characterised in that: The outer wall of the pressing plate roller (1) is provided with a pressing plate (2), the outer wall of the pressing plate (2) is provided with graphic information, the pressing plate (2) can rotate with the pressing plate roller (1), the bottom plate (3) is arranged below the pressing plate roller (1), the bottom plate (3) can move up and down, the outer wall of the bottom plate (3) is provided with a film (4), the film (4) passes around the top of the bottom plate (3), the inner wall surface of the film (4) is attached to the outer wall surface of the bottom plate (3), the film (4) can move along the outer wall of the bottom plate (3), one end of the pressing plate (2) is provided with a pressing port portion (22), the pressing port portion (22) is located at the end of the rotating direction of the pressing plate (2), the bottom surface of the pressing port portion (22) can be attached to the top surface of the film (4) up and down; Further comprising a lifting assembly (5), the lifting assembly (5) comprises a lifting wheel (51), the lifting wheel (51) can move up and down, the film (4) passes around the bottom of the lifting wheel (51), the top of the lifting wheel (51) is provided with a fixed block (52), the fixed block (52) and the lifting wheel (51) are provided with a spring (53) therebetween, the lower end of the spring (53) abuts against the upper end of the lifting wheel (51), the upper end of the spring (53) can abut against the lower end of the fixed block (52); The bottom plate (3) is provided with a slide hole (31), the slide hole (31) is slidably connected with a sliding block (6), the sliding block (6) can move up and down along the slide hole (31), the upper end of the slide hole (31) is provided with an elastic pad (9), the sliding block (6) moves upward to abut against the elastic pad (9) and push the bottom plate (3) to move upward.

2. The molding apparatus of claim 1 wherein: The bottom surface of the pressing port portion (22) is arc-shaped and the bending radius thereof is matched with the outer wall of the upper end of the film (4).

3. The molding apparatus of claim 1 wherein: The top of the bottom plate (3) is arc-shaped and the radius of the arc thereof is smaller than the radius of the pressing plate (2).

4. A molding process of a molding apparatus comprising the molding apparatus according to any one of claims 1 to 3, characterized by: Its molding process is: ①The pressing plate roller (1) is provided with a pressing plate end portion (23), the pressing plate roller (1) drives the pressing plate (2) to rotate until the pressing plate end portion (23) contacts one side of the film (4), the pressing plate (2) molds the film (4), and the film (4) moves under the winding action of the winding wheel (8); ②The winding wheel (8) stops winding, the film (4) no longer moves, the pressing plate (2) continues to rotate until the pressing port portion (22) is opposite to the film (4) on the top of the bottom plate (3), the pressing plate roller (1) stops rotating, the sliding block (6) continues to move upward and pushes the bottom plate (3) upward, and the pressing port portion (22) completes the molding of the film (4) on the top of the bottom plate (3); ③The sliding block (6) moves downward under the action of the air cylinder, the sliding block (6) is separated from the elastic pad (9), the bottom plate (3) moves downward under the action of the lifting wheel (51), and the sliding block (6) moves to the lower limit position.

5. The process of claim 4, wherein: In the initial position, the sliding block (6) is located below the elastic pad (9), and there is a spacing between the sliding block (6) and the elastic pad (9).

6. The process of claim 4, wherein: The spring (53) is in free state at initial position, and just abuts against the fixed block (52) and the lifting wheel (51) respectively when the pressing part (22) and the film (4) on the top of the bottom plate (3) are just close to each other.

7. The process of claim 4, wherein: The pressing plate (2) and the film (4) are fixed when the pressing part (22) molds the film (4) on the top of the bottom plate (3).

8. The process of claim 4, wherein: The lifting wheel (51) pulls down the film (4) to make the pressing part (22) and the film (4) on the top of the bottom plate (3) separate after the sliding block (6) moves downward.

9. The process of claim 4, wherein: The pressing plate (2) is provided with a notch (21), and the notch (21) is located on the side of the pressing part (22) close to the end (23) of the pressing plate.

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