A paper-plastic product surface coating device

Abstract

The utility model discloses a paper and plastic product surface coating device, including with the paper and plastic product shape adaptation is used for supporting paper and plastic product's support male die, the coating and pressing female die of up and down motion of being located support male die top, the profile of coating and pressing female die is adapted to the coating area of paper and plastic product, be provided with the coating layer carrying tape for adsorbing coating between support male die and coating and pressing female die, the coating layer carrying tape is together with coating and pressing female die and is pressed in the coating area of paper and plastic product and completes the coating of the coating area of paper and plastic product, still be provided with coating layer carrying tape traction device, and coating layer carrying tape traction device makes coating layer carrying tape with certain tension state forward delivery. The utility model can guarantee oily coating and waterborne coating can evenly adhere on paper and plastic product surface, and can adapt to the complex profile structure of paper and plastic product, can be widely applied in paper and plastic product surface coating field.

Description

Technical Field

[0001] This utility model relates to the field of paper-plastic product manufacturing and processing, specifically to a paper-plastic product surface coating device. Background Technology

[0002] In the production and processing of paper-plastic products such as paper-plastic cup lids and cups, depending on the usage scenario, the surface of the paper-plastic products is covered with coatings such as coloring, printing, and waterproofing / oil-proofing. Waterproofing / oil-proofing coatings are generally applied by spraying, and some flat surfaces are coated using pad printing. The disadvantages of spraying are that it atomizes the paint through a spray nozzle, evenly adhering it to the product surface. While this offers good uniformity, it also results in paint scattering and adhering everywhere, requiring operators to wear goggles, dust masks, and other personal protective equipment. Furthermore, it is wasteful and has low utilization rates. Additionally, it requires a highly sealed workshop environment, making equipment maintenance and cleaning inconvenient and potentially harmful to operator health. Pad printing, on the other hand, uses rubber or silicone tips to pick up paint from a gravure plate and transfer it to the area of ​​the product requiring coating. However, pad printing is only suitable for flat products and generally uses oil-based paints, offering good adhesion and controllable evaporation time. If water-based coatings are to be applied to the surface of paper-plastic products, the high surface tension and poor adhesion of these coatings can lead to uneven material feeding during pad printing, resulting in poor coating uniformity. Therefore, a coating device needs to be developed that can address both the defects of spray coating and the uniformity issues associated with pad printing for water-based coatings. Utility Model Content

[0003] The purpose of this utility model is to provide a coating device for the surface of paper-plastic products. By using this coating device, the problem of low paint utilization in the spraying process can be solved, as well as the problem of poor uniformity and inability to adapt to complex shapes when applying water-based paint in the pad printing process.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a paper-plastic product surface coating device, including a supporting punch adapted to the shape of the paper-plastic product for supporting the paper-plastic product, a coating die located above the supporting punch and movable up and down, the profile of the coating die being adapted to the coating area of ​​the paper-plastic product, a coating carrier belt for adsorbing coating material being provided between the supporting punch and the coating die, the coating carrier belt being pressed down together with the coating die and acting on the coating area of ​​the paper-plastic product to complete the coating of the paper-plastic product; and a coating carrier belt traction device is also provided, which causes the coating carrier belt to be conveyed forward under a certain tension.

[0005] Furthermore, a coating unit for coating the coating carrier is provided along the travel path of the coating carrier and before it enters the support punch.

[0006] Preferably, the coated carrier tape is a textile fabric with a certain degree of water absorption.

[0007] Specifically, the coating unit includes a coating box for holding coatings and a set of coating rollers that dip coatings from the coating box and attach them to the coating carrier belt.

[0008] In one embodiment, the coating roller assembly includes a pick-up roller located above the coating box, the lower part of which is immersed in the coating material in the coating box, and the coating carrier belt located above the pick-up roller. The pick-up roller picks up the coating material in the coating box and coats it onto the surface of the coating carrier belt.

[0009] To ensure the uniformity and thickness of the coating on the coating carrier, a driven roller is also provided above the take-up roller, and the coating carrier passes between the take-up roller and the driven roller.

[0010] To facilitate material handling, the surface of the material handling roller is covered with a layer of cloth or microporous silicone, or it is a metal roller with grooves on its surface.

[0011] In another embodiment, the coating roller assembly includes a take-up roller, at least its lower part of which is immersed in the coating material in the coating box, and the coating carrier belt passes under the take-up roller and is immersed in the coating material in the coating box; the discharge end of the coating box is provided with a leveling roller assembly for controlling the amount and uniformity of coating material on the coating carrier belt, the leveling roller assembly includes a leveling upper roller and a leveling lower roller that cooperate with each other, and a gap is provided between the leveling upper roller and the leveling lower roller for the coating carrier belt to pass through.

[0012] Furthermore, the coating carrier belt is a circulating carrier belt, which enters from the feed end of the coating box, exits from the discharge end, then enters from one end of the supporting punch, exits from the other end, and returns to the feed end of the coating box.

[0013] To reduce paint loss, a coating box is provided on each side of the supporting punch. The feeding end of the coating box is equipped with take-up and feed rollers, and the coating carrier belt reciprocates between the two take-up and feed rollers.

[0014] The beneficial effects of this invention are as follows: This invention employs a coating die and a coating carrier belt in conjunction to apply the coating material from the carrier belt onto the paper-plastic product. Because the carrier belt is a flexible structure, it can conform to the complex shape of the paper-plastic product under the action of the coating die, ensuring proper coating and effectively solving the problem of existing pad printing processes being unable to handle complex surfaces. Simultaneously, the coating die can be adjusted according to the area of ​​the paper-plastic product to be coated; the coating area can be continuous or discontinuous. Different coating dies can be replaced as needed, making adjustment convenient. This structure minimizes paint waste, thereby reducing production costs. The coating carrier belt can adhere not only to oil-based coatings but also to water-based coatings, ensuring smooth transfer of the coating material to the paper-plastic product. The coating unit can apply the coating material to the carrier belt and ensure the uniformity of the coating, thus guaranteeing the uniformity of the coating material on the surface of the paper-plastic product after coating.

[0015] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0017] Figure 2 This is a schematic diagram of the structure of the coating die and the paper-plastic product in the separated state of the present invention.

[0018] Figure 3 This is a schematic diagram of the structure of the coating die and the paper-plastic product in this utility model.

[0019] Figure 4 This is a schematic diagram of the structure of the intermediate coating carrier tape and the coating unit in this utility model. Figure 1 .

[0020] Figure 5 This is a schematic diagram of the structure of the intermediate coating carrier tape and coating unit in this utility model. Figure 2 .

[0021] Figure 6 This is a schematic diagram of the structure of this utility model. Figure 2 . Detailed Implementation

[0022] Example 1: As Figures 1 to 4As shown, a paper-plastic product surface coating apparatus includes a supporting punch 1 adapted to the shape of the paper-plastic product 10 for supporting the paper-plastic product 10, and a coating die 2 located above the supporting punch 1 and movable up and down. The profile of the supporting punch 1 is adapted to the profile of the paper-plastic product 10, so that each profile of the paper-plastic product 10 can be fully supported. The profile of the coating die 2 is adapted to the coating area of ​​the paper-plastic product 10, and can be set according to the area of ​​the paper-plastic product 10 that needs to be coated, such as... Figure 2 , Figure 3 As shown, this is a coating die structure with partial coating.

[0023] To ensure that oil-based and water-based coatings are evenly applied to the coating area of ​​the paper-plastic product 10, a coating carrier belt 3 for adsorbing coatings is provided between the supporting punch 1 and the coating die 2. After the coating carrier belt 3, which has adsorbed coatings, is transferred to the bottom of the coating die 2, the coating die 2 moves downward, causing the coating carrier belt 3 to press down together on the coating area of ​​the paper-plastic product to complete the coating. The coating carrier belt 3 is a textile fabric with a certain degree of water absorption and elasticity. After the coating carrier belt 3 has adsorbed the coatings, it enters the bottom of the coating die 2 for coating. The coating carrier belt 3 can be fully immersed and sealed for single use, or it can be applied by on-site immersion coating.

[0024] To reduce losses, on-site immersion coating is preferred. This involves setting up a coating unit 5 on-site to evenly coat the coating carrier belt 3 before it enters the coating die 2. To control the movement of the coating carrier belt 3, a coating carrier belt traction device 4 is also provided. This device conveys the coating carrier belt 3 forward at a certain tension. The traction device 4 includes at least one power roller 41, a set of support rollers 42, and tension adjusting rollers 43 positioned on the left and right sides of the coating die 2. These tension adjusting rollers 43 can adjust and move the coating carrier belt 3 as it is pressed down by the coating die 2, maintaining a certain tension. The tension adjusting rollers 43 are a common tension adjustment structure used in belt conveying and are existing technology; therefore, they will not be described in detail here.

[0025] The coating unit 5 includes a coating box 51 for holding coatings and a coating roller assembly 52 for picking up coatings from the coating box 51 and attaching them to the coating carrier belt 3. The coating roller assembly 52 includes a pick-up roller 521 located above the coating box 51, the lower part of which is immersed in the coatings in the coating box 51. The coating carrier belt 3 is located above the pick-up roller 521. The pick-up roller 521 is a power roller 41. The rotation of the pick-up roller 521 picks up the coatings in the coating box 51 and coats them onto the surface of the coating carrier belt 3.

[0026] To smoothly carry the coating out of the coating box 51, the pick-up roller 521 can be used in several ways. One method is to cover the surface of the pick-up roller 521 with a layer of cloth or microporous silicone 5211, which will adsorb the coating and transfer it to the surface of the coating carrier belt 3. Another method is to directly use a metal roller as the pick-up roller 521 and set grooves on the surface of the pick-up roller 521. The groove structure will carry the coating out of the coating box 51 and rotate it to the surface of the coating carrier belt 3.

[0027] To facilitate the forward movement of the coating carrier belt 3 and to control the amount and uniformity of coating on the belt, a driven roller 522 is provided above the take-up roller 521. The coating carrier belt 3 passes between the take-up roller 521 and the driven roller 522, moving forward under their influence. The amount of coating on the carrier belt 3 can be adjusted by regulating the gap between the driven roller 522 and the take-up roller 521, ensuring uniform adhesion of the coating to the carrier belt 3 under the action of the driven roller 522 and the take-up roller 521.

[0028] To enable the recycling of the coated carrier tape 3, the coated carrier tape 3 adopts a recycling structure, such as... Figure 1 As shown, the coating carrier belt 3 enters from the feed end of the coating box 51, exits from the discharge end, then enters from one end of the supporting punch 1, exits from the other end, and returns to the feed end of the coating box 51, forming a closed loop carrier belt. After use, the coating carrier belt 3 returns to the coating box 51 for re-immersion.

[0029] Example 2: A surface coating device for paper-plastic products, such as Figures 1 to 3 , Figure 5 As shown, the system includes a support punch 1 adapted to the shape of the paper-plastic product 10 for supporting the product, and a coating die 2 located above the support punch 1 and movable up and down. The profile of the support punch 1 is adapted to the profile of the paper-plastic product 10, so that each profile of the paper-plastic product 10 can be fully supported. In order to ensure that oil-based and water-based coatings can be evenly applied to the coating area of ​​the paper-plastic product 10, a coating carrier belt 3 for adsorbing coatings is provided between the support punch 1 and the coating die 2, and a coating carrier belt traction device 4 and a coating unit 5 are also provided.

[0030] The coating unit 5 includes a coating box 51 for holding coatings and a coating roller assembly 52 for picking up coatings from the coating box 51 and attaching them to the coating carrier belt 3. The coating roller assembly 52 includes a take-up roller 521, at least its lower part of which is immersed in the coatings in the coating box 51. The coating carrier belt 3 draws up coatings from below the take-up roller 521, passing over the coatings immersed in the coating box 51. To control the amount and uniformity of coatings on the coating carrier belt 3, a leveling roller assembly 53 is provided at the discharge end of the coating box 51 to control the quantity and uniformity of coatings on the coating carrier belt 3. The leveling roller assembly 53 includes a leveling upper roller 531 and a leveling lower roller 532 that cooperate with each other, with a gap between the leveling upper roller 531 and the leveling lower roller 532 for the coating carrier belt 3 to pass through. The amount and uniformity of coatings on the coating carrier belt 3 are controlled by adjusting the size of the gap between the leveling upper roller 531 and the leveling lower roller 532. The upper uniform roller 531 or the lower uniform roller 532 serves as the power roller 41. Other aspects are the same as in Embodiment 1.

[0031] Example 3: A surface coating device for paper-plastic products, such as Figures 2 to 6 As shown, the system includes a support punch 1 adapted to the shape of the paper-plastic product 10 for supporting the product, and a coating die 2 located above the support punch 1 and movable up and down. The profile of the support punch 1 is adapted to the profile of the paper-plastic product 10, so that each profile of the paper-plastic product 10 can be fully supported. In order to ensure that oil-based and water-based coatings can be evenly applied to the coating area of ​​the paper-plastic product 10, a coating carrier belt 3 for adsorbing coatings is provided between the support punch 1 and the coating die 2, and a coating carrier belt traction device 4 and a coating unit 5 are also provided.

[0032] To reduce paint loss, a coating box 51 is provided on each side of the supporting punch 1. The feed end of each coating box 51 is equipped with a take-up / feed roller 6, which serves as a power roller 41. The coating carrier belt 3 reciprocates between the two take-up / feed rollers 6. Thus, only a section of the coating carrier belt 3 needs to be wetted; the rest does not need to carry paint, thereby minimizing the amount of paint adsorbed by the coating carrier belt 3. Other aspects are the same as in Embodiment 1 or Embodiment 2.

[0033] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A surface coating device for paper-plastic products, characterized in that: The system includes a support punch (1) adapted to the shape of the paper-plastic product for supporting the paper-plastic product, and a coating die (2) located above the support punch (1) that can move up and down. The surface of the coating die (2) is adapted to the coating area of ​​the paper-plastic product. A coating carrier belt (3) for adsorbing coating is provided between the support punch (1) and the coating die (2). The coating carrier belt (3) is pressed down together with the coating die (2) and acts on the coating area of ​​the paper-plastic product to complete the coating of the paper-plastic product. A coating carrier belt traction device (4) is also provided, which causes the coating carrier belt (3) to be conveyed forward under a certain tension.

2. The paper-plastic product surface coating device according to claim 1, characterized in that: A coating unit (5) for coating the coating carrier (3) is provided on the travel path of the coating carrier (3) and before entering the support punch (1).

3. The paper-plastic product surface coating device according to claim 1, characterized in that: The coated carrier belt (3) is a textile fabric with a certain degree of water absorption and a certain degree of elasticity.

4. The paper-plastic product surface coating device according to claim 2, characterized in that: The coating unit (5) includes a coating box (51) for holding coatings and a set of coating rollers (52) for dipping coatings from the coating box (51) and attaching them to the coating carrier belt (3).

5. The paper-plastic product surface coating device according to claim 4, characterized in that: The coating roller assembly (52) includes a pick-up roller (521) located above the coating box (51), the lower part of which is immersed in the coating in the coating box (51), and the coating carrier belt (3) located above the pick-up roller (521). The pick-up roller (521) picks up the coating in the coating box (51) and coats it on the surface of the coating carrier belt (3).

6. The paper-plastic product surface coating apparatus according to claim 5, characterized in that: A driven roller (522) is also provided above the feeding roller (521), and the coating carrier belt (3) passes between the feeding roller (521) and the driven roller (522); the gap between the driven roller (522) and the feeding roller (521) is adjustable to control the amount of coating applied to the coating carrier belt (3).

7. The paper-plastic product surface coating apparatus according to claim 5, characterized in that: The surface of the feeding roller (521) is covered with a layer of cloth or microporous silicone, or it is a metal roller with grooves on its surface.

8. The paper-plastic product surface coating apparatus according to claim 4, characterized in that: The coating roller assembly (52) includes a take-up roller (521), at least the lower part of which is immersed in the coating material of the coating box (51). The coating carrier belt (3) passes under the take-up roller (521) and is immersed in the coating material of the coating box (51). The discharge end of the coating box (51) is provided with a leveling roller assembly (53) for controlling the amount and uniformity of coating material on the coating carrier belt (3). The leveling roller assembly (53) includes a leveling upper roller (531) and a leveling lower roller (532) that cooperate with each other. A gap is provided between the leveling upper roller (531) and the leveling lower roller (532) for the coating carrier belt (3) to pass through.

9. The paper-plastic product surface coating device according to claim 4, characterized in that: The coating carrier belt (3) is a circulating carrier belt. The coating carrier belt (3) enters from the feed end of the coating box (51), exits from the discharge end, then enters from one end of the supporting punch (1), exits from the other end, and returns to the feed end of the coating box (51).

10. The paper-plastic product surface coating apparatus according to claim 4, characterized in that: A coating box (51) is provided on each side of the supporting punch (1). The feeding end of the coating box (51) is provided with a take-up and feed roller (6). The coating carrier belt (3) reciprocates between the two take-up and feed rollers (6).

Images