Coating equipment for film packaging material

Abstract

The present invention relates to the technical field of coating equipment, and in particular to a coating equipment for film packaging materials, comprising a device body and a coating roller arranged on the device body, a coating box is arranged on the device body below the coating roller, the inner bottom wall of the coating box is a wavy structure with concave sides and convex in the middle, when in use, a relatively thin inner coating layer is pre-coated on the surface of the film through a driving mechanism, and the two ends of the elastic curved plate are driven to be lifted up respectively, and a thin and thick inner coating layer is pre-coated on the surface of the film, and the coating roller and back roller on the other side are used to further thicken the film, and the thickened coating layer will be interlaced and bonded with the previously pre-coated inner coating layer, thereby forming a coating layer with strong bonding force on the surface of the film. The coating equipment adopts a multi-stage coating method, which achieves the purpose of coating a thicker coating layer, avoids the generation of interfering liquid bridges, and can also squeeze out bubbles that may remain in the coating layer, thereby ensuring the coating quality of the film packaging material.

Description

Technical Field

[0001] The invention relates to the technical field of coating equipment, and in particular to a coating equipment for film packaging materials. Background Art

[0002] In order to improve the various properties of film packaging materials to meet the needs of different fields, it is necessary to perform surface coating operations on film packaging materials. Existing film coating equipment usually uses a driving component to drive the coating roller to rotate, and cooperates with a brush head to coat the film surface.

[0003] For example, a Chinese patent with application number CN202311243477.8 discloses a thin film coating device. When the hollow brush head provided therein contacts the coating roller, the rotating coating roller causes the bottom of the hollow brush head to bend, thereby expanding the opening of the hollow brush head, and periodically releasing the coating agent inside the storage box onto the coating roller. The coating roller is replenished with the coating machine in a timely manner, thereby realizing the periodic release of the coating agent, effectively avoiding the situation where a single release amount is too large, and is also conducive to uniform coating, improving the consistency of the coating thickness, and enhancing the overall coating effect. However, for film packaging materials that are often used outdoors, multiple coatings with different properties are usually applied, and thicker multiple layers of coating are applied on the surface of the film to ensure the barrier properties and wear resistance and impact resistance of the items to be packaged. The film coating equipment uses a coating method that periodically releases the coating agent. Interference liquid bridges are easily generated on the coating layer with a large dose, that is, the liquid connection formed between the coating liquid and the film or the coating roller. The gas in the liquid bridge cannot be completely removed, resulting in bubbles or pinholes in the coating layer. When the bubbles are too large, the coating layer and the film may even be separated from each other. Summary of the invention

[0004] In view of this, the purpose of the present invention is to propose a coating device for film packaging materials to solve the technical problem that when coating thicker multi-layer coatings on the film surface in the prior art, the coating method of periodically releasing the coating agent is prone to produce interfering liquid bridges on the coating layer with a larger dosage, thereby affecting the quality of the coated product.

[0005] Based on the above purpose, the present invention provides a coating device for film packaging materials, comprising a device body and a coating roller arranged on the device body, a coating box is arranged on the device body below the coating roller, the inner bottom wall of the coating box is a wave-like structure with concave sides and a convex middle, the concave inner bottom walls on both sides of the coating box are arranged with a depth difference, and the lower part of the concave structures on both sides of the coating box is provided with a discharge opening, and the coating device also includes:

[0006] There are at least two back rollers, both of which are provided with spiral propulsion grooves, and the two back rollers are rotatably mounted in the concave structures on both sides of the coating box, respectively, and the two back rollers have different roller diameters, wherein the back roller with a relatively large roller diameter is close to the coating discharge side of the packaging material;

[0007] An elastic curved plate, the elastic curved plate being mounted on the middle raised structure of the paint box;

[0008] Blocking balls, the blocking balls are installed at both ends of the elastic curved plate;

[0009] A material blocking portion, the material blocking portion being inserted into the two material discharge openings;

[0010] A driving mechanism 1, wherein the driving mechanism 1 is used to drive the two back rollers to rotate in the same direction, and also drives the two ends of the elastic curved plate to be lifted up respectively, so that the blocking ball enters the spiral advancement groove and squeezes the paint in the spiral advancement groove;

[0011] The second driving mechanism is used to drive the material blocking part to move up and down so as to discharge the paint stored in the concave structures on both sides of the paint box.

[0012] Furthermore, the driving mechanism 1 comprises:

[0013] A driving motor, the driving motor is mounted on the device body through a mounting frame;

[0014] A driving wheel, the driving wheel is installed on the output end of the driving motor;

[0015] A driven wheel, the driven wheel is mounted on the side ends of the coating roller and the backing roller, and the driven wheel is connected to the driving wheel through a synchronous belt;

[0016] A crank, one end of which is fixedly mounted on the output end of the driving motor and is placed outside the driving wheel;

[0017] a pulley rotatably mounted on the other end of the crank;

[0018] A rotating shaft, the rotating shaft is mounted on the mounting frame;

[0019] A rocker arm, one end of which is mounted on the rotating shaft, a slide groove is provided in the middle of the rocker arm, and the pulley is slidably arranged in the slide groove;

[0020] The top support plate is in a "V"-shaped structure, and rollers are installed at both ends of the top support plate. The rollers penetrate the middle convex structure of the paint box and abut against the lower surface of the elastic curved plate.

[0021] Furthermore, baffles are detachably mounted on both sides of the paint box, and the two back rollers are mounted on the baffles.

[0022] Furthermore, the middle portion of the elastic curved plate is mounted on the middle protruding structure of the paint box by means of bolts, and the elastic curved plate fits with the middle protruding structure of the paint box when no force is applied.

[0023] Furthermore, a feed pump is installed on the device body, and the feed pump is connected to the concave structures on both sides of the paint box.

[0024] Furthermore, a material passing opening is provided in the middle of the two material blocking parts, a guide plate inclined downward is installed in the material passing opening, and a material receiving trough is also provided below the guide plate between the two material blocking parts.

[0025] Furthermore, the second driving mechanism comprises:

[0026] A cylinder, wherein the cylinder is mounted on the lower ends of both sides of the coating box through a mounting seat, and a guide hole is opened on the mounting seat;

[0027] A guide block, the guide block is installed at the side end of the material blocking portion, and the guide block is also slidably disposed in the guide hole;

[0028] A connecting plate, one end of which is mounted on the output end of the cylinder, and the other end of which is mounted on the side end of the material blocking portion.

[0029] Furthermore, when the output end of the cylinder is in an extended state, the material blocking portion is separated from the discharge opening, and when the output end of the cylinder is in a retracted state, the material blocking portion is sealed from the discharge opening.

[0030] Furthermore, an adjustment groove is provided on the device body, and a film guide roller is adjustably installed in the adjustment groove.

[0031] Furthermore, the roller edge end surface of the back roller is a mesh structure.

[0032] The beneficial effects of the present invention are as follows: when using a coating device for film packaging materials of the present invention, the two back rollers are driven to rotate in the same direction by a driving mechanism 1, and then a relatively thin inner coating layer is pre-coated on the surface of the film, and the two ends of the elastic curved plate are driven to be lifted up respectively, so that the blocking ball enters the spiral propulsion groove, squeezes the coating in the spiral propulsion groove, and pre-coats a thin and thick inner coating layer on the surface of the film, and cooperates with the coating roller and the back roller on the other side to further thicken the film. The thickened coating will be interlaced and bonded with the previously pre-coated inner coating layer, and then a coating layer with strong bonding force is formed on the surface of the film. The coating device adopts a multi-stage coating method, which achieves the purpose of coating a thicker coating layer, avoids the generation of interfering liquid bridges, and can also squeeze out bubbles that may remain in the coating layer to ensure the coating quality of the film packaging material; and the material blocking part is driven to rise and fall by a driving mechanism 2 to discharge the coating stored in the concave structures on both sides of the coating box. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A structural schematic diagram of the present invention from one perspective;

[0035] Figure 2 It is a structural schematic diagram of another perspective of the present invention;

[0036] Figure 3 This is a schematic diagram of the assembly of the device after the device body is removed;

[0037] Figure 4 It is a schematic diagram of the assembly of the driving mechanism 1, the coating roller and the backing roller in the present invention;

[0038] Figure 5 It is a schematic diagram of the assembly of the driving mechanism 1 and the elastic curved plate in the present invention;

[0039] Figure 6 It is a schematic diagram of assembling the coating box and the elastic curved plate in the present invention;

[0040] Figure 7 It is a schematic diagram of the assembly of the back roller and the baffle in the present invention;

[0041] Figure 8 It is a schematic diagram of the assembly of the material blocking part and the second driving mechanism in the present invention.

[0042] The markings in the figure are:

[0043] 1. Device body; 2. Coating roller; 3. Coating box; 4. Discharge opening; 5. Back roller; 6. Spiral propulsion groove; 7. Elastic curved plate; 8. Blocking ball; 9. Blocking part; 10. Driving motor; 11. Mounting frame; 12. Driving wheel; 13. Driven wheel; 14. Synchronous belt; 15. Crank; 16. Pulley; 17. Rotating shaft; 18. Rocker arm; 19. Slide; 20. Top support plate; 21. Roller; 22. Baffle; 23. Material opening; 24. Guide plate; 25. Material receiving trough; 26. Cylinder; 27. Mounting seat; 28. Guide hole; 29. ​​Guide block; 30. Connecting plate; 31. Adjusting groove; 32. Film guide roller; 33. Feed pump. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0045] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] In a first aspect of the present invention, a coating device for film packaging material is provided, such as Figure 1-8 As shown, it includes a device body 1 and a coating roller 2 arranged on the device body 1, a coating box 3 is arranged on the device body 1 below the coating roller 2, the inner bottom wall of the coating box 3 is a wave-like structure with concave sides and convex in the middle, the concave inner bottom walls on both sides of the coating box 3 are arranged with a depth difference, and the lower part of the concave structures on both sides of the coating box 3 is provided with a discharge opening 4, and the coating device also includes:

[0047] Back rollers 5, at least two of which are provided with spiral propulsion grooves 6, and the two back rollers 5 are rotatably mounted in the concave structures on both sides of the coating box 3, respectively, and the two back rollers 5 have different roller diameters, wherein the back roller 5 with a relatively large roller diameter is close to the coating discharge side of the packaging material;

[0048] An elastic curved plate 7, wherein the elastic curved plate 7 is mounted on the middle convex structure of the coating box 3;

[0049] Blocking balls 8, the blocking balls 8 are installed at both ends of the elastic curved plate 7;

[0050] A material blocking portion 9, the material blocking portion 9 is inserted into the two discharge openings 4;

[0051] The driving mechanism 1 is used to drive the two back rollers 5 to rotate in the same direction, and also drives the two ends of the elastic curved plate 7 to lift up respectively, so that the blocking ball 8 enters the spiral advancement groove 6 to squeeze the paint in the spiral advancement groove 6;

[0052] The second driving mechanism is used to drive the material blocking portion 9 to move up and down so as to discharge the paint stored in the concave structures on both sides of the paint box 3 .

[0053] In this embodiment, the driving mechanism 1 includes:

[0054] A driving motor 10, wherein the driving motor 10 is mounted on the device body 1 via a mounting bracket 11;

[0055] A driving wheel 12, wherein the driving wheel 12 is mounted on the output end of the driving motor 10;

[0056] A driven wheel 13, the driven wheel 13 is mounted on the side ends of the coating roller 2 and the backing roller 5, and the driven wheel 13 is connected to the driving wheel 12 through a synchronous belt 14;

[0057] A crank 15, one end of which is fixedly mounted on the output end of the driving motor 10 and is placed outside the driving wheel 12;

[0058] a pulley 16, the pulley 16 being rotatably mounted on the other end of the crank 15;

[0059] A rotating shaft 17, wherein the rotating shaft 17 is mounted on the mounting frame 11;

[0060] A rocker arm 18, one end of which is mounted on the rotating shaft 17, a slide groove 19 is provided in the middle of the rocker arm 18, and the pulley 16 is slidably disposed in the slide groove 19;

[0061] The top support plate 20 is in a “V”-shaped structure, and rollers 21 are installed at both ends of the top support plate 20 . The rollers 21 penetrate the middle convex structure of the paint box 3 and abut against the lower surface of the elastic curved plate 7 .

[0062] In this embodiment, baffles 22 are detachably installed on both sides of the paint box 3, and the two back rollers 5 are installed on the baffles 22. The middle part of the elastic curved plate 7 is installed on the middle raised structure of the paint box 3 by bolts. The elastic curved plate 7 fits with the middle raised structure of the paint box 3 when no force is applied.

[0063] In this embodiment, a feed pump 33 is installed on the device body 1 , and the feed pump 33 is connected to the concave structures on both sides of the paint box 3 .

[0064] In this embodiment, when in use, the coating liquid with different properties is added into the concave structures on both sides of the coating box 3 by the feed pump 33, and the film to be coated is placed through the relatively small gap between the coating roller 2 and the back roller 5 on one side through the external conveying device, and then placed out through the relatively large gap between the coating roller 2 and the back roller 5 on the other side, that is, the back roller 5 on the side with a small roller diameter completes the pre-coating of the packaging material to form a relatively thin inner coating layer;

[0065] Specifically, the driving mechanism 1 is started, and the driving motor 10 therein drives the driving wheel 12 and the crank 15 to rotate synchronously. The rotation process of the driving wheel 12 drives each driven wheel 13 to rotate in the same direction through the synchronous belt 14. The roller edge end face and the spiral advancing groove 6 of the back roller 5 on the side where the film is placed pass through the coating liquid accumulated in the coating box 3, and the coating liquid attached to the film surface will be coated on the film surface as the back roller 5 rotates. This coating process can pre-coat a relatively thin inner coating layer on the film surface;

[0066] At the same time, with the synchronous rotation of the crank 15, the pulley 16 is driven to slide back and forth in the slide groove 19, and then the rocker arm 18 is driven to swing back and forth around the rotating shaft 17. During the swinging process, the roller 21 on the supporting plate 20 is driven to support the elastic curved plate 7 above, driving the elastic curved plate 7 to bend upward at the end, so that the blocking ball 8 at the end extends into the spiral advancing groove 6, squeezing the paint in the spiral advancing groove 6, thereby reducing the amount of paint applied on the surface of the film;

[0067] As the roller 21 is released from supporting the elastic curved plate 7, the elastic curved plate 7 again adheres to the middle convex structure of the coating box 3 under its own elastic force, and the back roller 5 continues to apply the attached coating liquid to the surface of the film. In this process, a thin and thick inner coating layer is pre-coated on the surface of the film.

[0068] As the coating roller 2 on the other side and the back roller 5 with a relatively larger roller diameter further thicken the film, because the two back rollers 5 are driven by the same synchronous belt 14, when the rotation speeds of the two back rollers 5 are the same, the back roller 5 with a larger roller diameter has a larger surface linear speed. Under the high linear speed state, the thickened coating applied later will be thrown into the inner coating layer with alternating thin and thick coatings, that is, it will be interlaced and bonded with the previously pre-coated inner coating layer, thereby forming a coating layer with strong bonding force on the surface of the film. This coating equipment adopts a multi-stage coating method, which realizes the purpose of coating multiple types of coatings to form a thicker coating layer, avoids the generation of interfering liquid bridges, and can also squeeze out bubbles that may remain in the coating layer;

[0069] After the film surface coating operation is completed, the second driving mechanism is started to separate the material blocking portion 9 from the material discharge opening 4, and the coating liquid retained in the coating box 3 can be discharged.

[0070] In this embodiment, the second driving mechanism includes:

[0071] Cylinder 26, the cylinder 26 is mounted on the lower ends of both sides of the coating box 3 through a mounting seat 27, and the mounting seat 27 is provided with a guide hole 28;

[0072] A guide block 29, the guide block 29 is installed at the side end of the material stopper 9, and the guide block 29 is also slidably disposed in the guide hole 28;

[0073] A connecting plate 30 , one end of which is mounted on the output end of the cylinder 26 , and the other end of which is mounted on the side end of the material stopper 9 .

[0074] In this embodiment, if Figure 8 As shown, a feeding opening 23 is provided in the middle of the two material blocking parts 9, and a guide plate 24 inclined downward is installed in the material passing opening 23. A material receiving trough 25 is also provided between the two material blocking parts 9 below the guide plate 24. The cylinder 26 drives the material blocking part 9 downward through the connecting plate 30, and the coating liquid is discharged through the discharge opening 4, the guide plate 24 and the feeding opening 23 in turn and collected in the material receiving trough 25, so as to realize the recovery of the remaining coating liquid and reduce the waste of the coating liquid.

[0075] In this embodiment, if Figure 3 , Figure 8 As shown, when the output end of the cylinder 26 is in the extended state, the blocking portion 9 is separated from the discharge opening 4, and when the output end of the cylinder 26 is in the retracted state, the blocking portion 9 is sealed with the discharge opening 4 to prevent paint leakage from the film during the coating process, and after the coating operation is completed, the coating liquid in the paint box 3 can be completely recovered.

[0076] In this embodiment, if Figure 1 , Figure 2 As shown, an adjusting groove 31 is opened on the device body 1, and a film guide roller 32 can be adjustably installed in the adjusting groove 31. For coating liquids with different viscosities, the installation position of the film guide roller 32 can be appropriately adjusted in the adjusting groove 31 to adjust the discharging and conveying angle of the coated film to avoid the occurrence of self-flow streaks in the coating layer.

[0077] In this embodiment, if Figure 7 As shown, the roller edge end surface of the back roller 5 is a reticulated structure, so that the coating liquid between the film and the back roller 5 can be better transferred to ensure the overall consistency of the coating of the film packaging material.

[0078] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0079] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A coating device for film packaging materials, comprising a device body (1) and a coating roller (2) arranged on the device body (1), wherein a coating box (3) is arranged on the device body (1) below the coating roller (2), characterized in that: The inner bottom wall of the coating box (3) is a wave-shaped structure with concave sides and a convex middle part. The concave inner bottom walls on both sides of the coating box (3) are arranged with a depth difference, and discharge openings (4) are provided at the lower parts of the concave structures on both sides of the coating box (3). The coating device further comprises: Back rollers (5), there are two back rollers (5), both of which are provided with spiral propulsion grooves (6), and the two back rollers (5) are rotatably mounted in the concave structures on both sides of the coating box (3), respectively, and the two back rollers (5) have different roller diameters, wherein the back roller (5) with a relatively large roller diameter is close to the coating discharge side of the packaging material; An elastic curved plate (7), the elastic curved plate (7) being mounted on the middle raised structure of the paint box (3); Blocking balls (8), the blocking balls (8) being mounted on both ends of the elastic curved plate (7); A material blocking portion (9), the material blocking portion (9) being inserted into the two material discharge openings (4); A driving mechanism 1, the driving mechanism 1 is used to drive the two back rollers (5) to rotate in the same direction, and also drives the two ends of the elastic curved plate (7) to be lifted up respectively, so that the blocking ball (8) enters the spiral propulsion groove (6) to squeeze the paint in the spiral propulsion groove (6); A second driving mechanism, the second driving mechanism is used to drive the material blocking portion (9) to move up and down, so as to discharge the paint stored in the concave structures on both sides of the paint box (3).

2. A coating device for film packaging materials according to claim 1, characterized in that: The driving mechanism 1 comprises: A drive motor (10), the drive motor (10) being mounted on the device body (1) via a mounting frame (11); A driving wheel (12), the driving wheel (12) being mounted on an output end of the driving motor (10); A driven wheel (13), the driven wheel (13) being mounted on the side ends of the coating roller (2) and the back roller (5), the driven wheel (13) being connected to the driving wheel (12) via a synchronous belt (14); A crank (15), one end of the crank (15) being fixedly mounted on the output end of the drive motor (10) and disposed outside the driving wheel (12); a pulley (16), the pulley (16) being rotatably mounted on the other end of the crank (15); A rotating shaft (17), the rotating shaft (17) being mounted on the mounting frame (11); A rocker arm (18), one end of the rocker arm (18) being mounted on the rotating shaft (17), a slide groove (19) being provided in the middle of the rocker arm (18), and the pulley (16) being slidably disposed in the slide groove (19); A top support plate (20) is in a "V"-shaped structure, with rollers (21) mounted on both ends of the top support plate (20), the rollers (21) passing through the middle raised structure of the paint box (3) and resting against the lower surface of the elastic curved plate (7).

3. A coating device for film packaging materials according to claim 2, characterized in that: Baffles (22) are detachably mounted on both sides of the paint box (3), and the two back rollers (5) are mounted on the baffles (22).

4. A coating device for film packaging materials according to claim 2, characterized in that: The middle portion of the elastic curved plate (7) is mounted on the middle protruding structure of the paint box (3) by means of bolts, and the elastic curved plate (7) fits the middle protruding structure of the paint box (3) in the absence of force.

5. The coating device for film packaging material according to claim 1, characterized in that: A feed pump (33) is installed on the device body (1), and the feed pump (33) is connected to the concave structures on both sides of the paint box (3).

6. A coating device for film packaging materials according to claim 1, characterized in that: A material passing opening (23) is provided in the middle of the two material blocking parts (9), a guide plate (24) inclined downward is installed in the material passing opening (23), and a material receiving trough (25) is provided below the guide plate (24) between the two material blocking parts (9).

7. A coating device for film packaging materials according to claim 6, characterized in that: The second driving mechanism comprises: A cylinder (26), the cylinder (26) being mounted on lower ends of both sides of the coating box (3) via a mounting seat (27), and a guide hole (28) being formed on the mounting seat (27); A guide block (29), the guide block (29) being mounted on a side end of the material blocking portion (9), and the guide block (29) being slidably disposed in the guide hole (28); A connecting plate (30), one end of the connecting plate (30) is mounted on the output end of the cylinder (26), and the other end of the connecting plate (30) is mounted on the side end of the material blocking portion (9).

8. A coating device for film packaging materials according to claim 7, characterized in that: When the output end of the cylinder (26) is in an extended state, the material blocking portion (9) is separated from the material discharge opening (4); when the output end of the cylinder (26) is in a retracted state, the material blocking portion (9) is sealed from the material discharge opening (4).

9. The coating device for film packaging material according to claim 1, characterized in that: An adjustment groove (31) is provided on the device body (1), and a film guide roller (32) is adjustably installed in the adjustment groove (31).

10. The coating device for film packaging material according to claim 1, characterized in that: The roller edge end surface of the back roller (5) is a mesh-like structure.

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