Multi-layer composite coating and gluing device for environmentally friendly paperboard labels

CN224389160UActive Publication Date: 2026-06-23KUNSHAN KATE PACKAGING MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
KUNSHAN KATE PACKAGING MATERIALS CO LTD
Filing Date
2025-06-05
Publication Date
2026-06-23

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Abstract

The utility model relates to multilayer composite gluing equipment technical field discloses multilayer composite gluing device for environmental protection paperboard label, including frame, the inner wall left part of frame before and after side all slide connections have notched block, the inner wall of two notched blocks all is provided with limit rod, the inner wall left side of frame is connected with the steering column that rotates, the top left side fixed connection of frame has the heat preservation glue tank, the bottom of heat preservation glue tank is connected with the glue pipe that goes out, the top right side rotation of frame is connected with the discharge column, the inner wall middle part fixed connection of frame has the limit board, in the utility model, through starting the speed reducer, drive gear rotates, and linkage gear makes the material column rotate, uses electric telescopic link no.
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Description

Technical Field

[0001] This utility model relates to the technical field of multi-layer composite coating equipment, and in particular to a multi-layer composite coating device for environmentally friendly cardboard labels. Background Technology

[0002] With increasing environmental awareness, multi-layer composite coating equipment for environmentally friendly paperboard labels is a key device for achieving efficient bonding of environmentally friendly paperboard and label materials. This type of equipment coats the surface of environmentally friendly paperboard with glue and then bonds it with multiple layers of label paper or protective film. It is used in the packaging and printing industries, ensuring the aesthetics and functionality of products while aligning with the concept of sustainable development.

[0003] Early multi-layer laminating adhesive coating devices had relatively simple structures, mainly consisting of an adhesive storage tank, a simple coating head, a single laminating roller, and a conveying mechanism. These devices suffered from uneven adhesive application and poor lamination results. To address these issues, existing devices employ adjustable coating heads, pressure sensor-controlled laminating rollers, and automated conveying systems, which have improved coating and lamination quality to some extent. However, existing multi-layer laminating adhesive coating devices still struggle to fully utilize the adhesive when dealing with environmentally friendly cardboard labels of varying thicknesses. While existing devices adjust the laminating roller pressure to accommodate different material thicknesses and prevent insufficient adhesion due to insufficient pressure, the slow response time of the pressure adjustment mechanism and the difficulty in precisely matching the optimal pressure required for different material thicknesses mean that the laminating roller cannot quickly and accurately adjust the pressure when the cardboard label thickness changes. This results in poor adhesive penetration and bonding between materials of different thicknesses, causing some areas where the adhesive is not fully bonded to the material, affecting the lamination strength and quality stability of the environmentally friendly cardboard labels. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a multi-layer composite adhesive coating device for environmentally friendly cardboard labels, which aims to improve the problem in the prior art that the composite roller cannot quickly and accurately adjust the pressure, resulting in poor penetration and bonding effect of adhesive between materials of different thicknesses.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a multi-layer composite gluing device for environmentally friendly cardboard labels, comprising a frame, with recessed blocks slidably connected to the front and rear sides of the left side of the inner wall of the frame, and limit rods provided on the inner walls of the two recessed blocks; a steering column rotatably connected to the left side of the inner wall of the frame; an insulated glue tank fixedly connected to the top left side of the frame, with a glue outlet pipe connected to the bottom end of the insulated glue tank; a feeding column rotatably connected to the top right side of the frame; a limit plate fixedly connected to the middle of the inner wall of the frame; an auxiliary column rotatably connected to the middle of the inner wall of the frame; an electric telescopic rod rotatably connected to the front and rear sides of the right side of the inner wall of the frame, with a slider fixedly connected to one end of the electric telescopic rod rotatably connected to the adjacent sides of the two sliders; a transmission assembly provided at the bottom front end of the frame; and a folding mechanism provided at the top left side of the inner wall of the frame, the folding mechanism being used to adjust the scraper according to the required glue width.

[0006] As a further description of the above technical solution:

[0007] The folding mechanism includes a limiting strip, the front and rear sides of which are fixedly connected to the front and rear ends of the top left side of the inner wall of the frame, respectively. An electric telescopic rod is fixedly connected to the right side of the limiting strip, and a fixing strip is fixedly connected to one end of the electric telescopic rod. Sliding blocks are rotatably connected to the front and rear sides of the bottom of the fixing strip. Scrapers are slidably connected to the outer wall of the sliding blocks. A pad is fixedly connected to the top of the inner wall of the frame. The adjacent sides of the two scrapers are rotatably connected to the middle of the top of the pad. Rollers are rotatably connected to the front and rear sides of the right side of the pad.

[0008] As a further description of the above technical solution:

[0009] The transmission assembly includes a geared motor, the rear of which is fixedly connected to the bottom front end of the frame. The output end of the geared motor passes through the frame and is fixedly connected to a drive gear. A linkage gear is rotatably connected to the bottom right side of the inner wall of the frame. A receiving column is fixedly connected to the front end of the outer wall of the linkage gear. The outer wall of the drive gear is meshed with the receiving column. The rear ends of both the linkage gear and the discharging column pass through the frame and are fixedly connected to pulleys. Belts are provided on the outer walls of both pulleys.

[0010] As a further description of the above technical solution:

[0011] A temperature sensor is fixedly connected to the front left side of the thermal insulation glue tank, and a liquid level window is opened on the front right side of the thermal insulation glue tank. A sealing sleeve is fixedly connected to the outer wall of the liquid level window.

[0012] As a further description of the above technical solution:

[0013] The top of the thermal insulation glue tank is connected to a filling pipe, and the top of the outer wall of the filling pipe is threaded with a pipe cap. The outer wall of the glue outlet pipe is fixedly connected with a regulating valve.

[0014] As a further description of the above technical solution:

[0015] A conical collecting block is fixedly connected to the middle of the bottom of the inner wall of the frame. The bottom front of the conical collecting block is connected to a discharge pipe, and the outer wall of the discharge pipe penetrates the front of the frame.

[0016] As a further description of the above technical solution:

[0017] Limiting rings are fixedly connected to the front and rear sides of the left side of the frame, and the inner wall of the limiting rings is slidably connected with a locking mechanism.

[0018] As a further description of the above technical solution:

[0019] A controller is fixedly connected to the center of the front side of the frame. The controller is electrically connected to the second electric telescopic pole, the geared motor, and the first electric telescopic pole.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, a label roll coated with composite adhesive is placed on a limiting rod, then sequentially wrapped around a steering column, a limiting plate, an auxiliary column one, and an auxiliary column two, and then onto a receiving column. At the same time, a protective film roll is placed on a dispensing column. The reduction motor is started, driving the gears to rotate, which in turn causes the receiving column to rotate. The electric telescopic rod two and the sliding adjustment auxiliary column two are used to change the distance between auxiliary column one and auxiliary column two, control the bonding pressure between the materials, ensure the adhesive effect, and improve the bonding strength.

[0022] 2. In this utility model, by activating the electric telescopic rod, the fixed strip and the sliding block are moved, the scraper rotates around the pad, and the movement of the sliding block drives the scraper to rotate, changing its horizontal width. When the glue falls on top, the scraper scrapes the glue, making it evenly spread on the label, thereby realizing the adjustment of the scraping range of the scraper according to the width of the label. Attached Figure Description

[0023] Figure 1 This is a perspective view of the multi-layer composite adhesive coating device for environmentally friendly cardboard labels proposed in this utility model;

[0024] Figure 2 This is a front view of the multi-layer composite adhesive coating device for environmentally friendly cardboard labels proposed in this utility model.

[0025] Figure 3 This is a rear view of the multi-layer composite adhesive coating device for environmentally friendly cardboard labels proposed in this utility model.

[0026] Figure 4 This is a cross-sectional view of the multi-layer composite adhesive coating device for environmentally friendly cardboard labels proposed in this utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the heat-insulating glue tank of the multi-layer composite coating device for environmentally friendly cardboard labels proposed in this utility model.

[0028] Legend:

[0029] 1. Frame; 2. Folding mechanism; 201. Limiting strip; 202. Electric telescopic rod one; 203. Fixing strip; 204. Sliding block; 205. Scraper; 206. Pad; 207. Roller; 3. Notch block; 4. Limiting rod; 5. Steering column; 6. Insulating glue tank; 7. Glue outlet pipe; 8. Discharge column; 9. Limiting plate; 10. Auxiliary column one; 11. Electric telescopic rod two; 12. Slider; 13. Auxiliary column two; 14. Gear motor; 15. Drive gear; 16. Linkage gear; 17. Receiving column; 18. Pulley; 19. Belt; 20. Temperature sensor; 21. Liquid level window; 22. Sealing sleeve; 23. Filling pipe; 24. Pipe cap; 25. Regulating valve; 26. Conical collecting block; 27. Discharge pipe; 28. Jammer; 29. ​​Limiting ring; 30. Controller. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Reference Figure 1 , Figure 3 and Figure 4This utility model provides an embodiment of a multi-layer composite adhesive coating device for environmentally friendly cardboard labels, comprising a frame 1. The inner wall of the frame 1 has slidably connected recessed blocks 3 on both the front and rear sides of the left side. Each recessed block 3 has a limiting rod 4 on its inner wall. The label roll to be coated with composite adhesive is placed above the limiting rod 4, and the label is sequentially wound around a steering column 5, a limiting plate 9, an auxiliary column 10, and an auxiliary column 2 13, finally winding around a take-up column 17. The steering column 5 is rotatably connected to the left side of the inner wall of the frame 1. An insulated adhesive tank 6 is fixedly connected to the top left side of the frame 1. The bottom end of the insulated adhesive tank 6 is connected to an adhesive outlet pipe 7, from which the composite adhesive flows... The adhesive flows from the heat-insulating glue tank 6 through the glue outlet pipe 7 and falls onto the label. A feeding column 8 is rotatably connected to the top right side of the frame 1. A limit plate 9 is fixedly connected to the middle of the inner wall of the frame 1. An auxiliary column 10 is rotatably connected to the middle of the inner wall of the frame 1. Electric telescopic rods 11 are fixedly connected to both the front and rear sides of the right side of the inner wall of the frame 1. A slider 12 is fixedly connected to one end of each of the two sliders 12. An auxiliary column 13 is rotatably connected to each adjacent side of the two sliders 12. Activating the electric telescopic rods 11 moves the sliders 12 and the auxiliary columns 13 up and down, thereby changing the distance between the auxiliary columns 10 and 13. This controls the bonding pressure between multiple layers of materials. A transmission assembly is located at the bottom front of the frame 1, and a folding mechanism 2 is located at the top left side of the inner wall of the frame 1. The folding mechanism 2 is used to adjust the scraper 205 according to the required adhesive width. The transmission assembly includes a geared motor 14, whose rear side is fixedly connected to the bottom front of the frame 1. The output end of the geared motor 14 passes through the frame 1 and is fixedly connected to a drive gear 15. A linkage gear 16 is rotatably connected to the bottom right side of the inner wall of the frame 1, and a receiving column 17 is fixedly connected to the front end of the outer wall of the linkage gear 16. The protective film roll is placed above the feeding column 8, and then the geared motor 14 is started. The drive gear 15 rotates, and under the meshing relationship between the drive gear 15 and the linkage gear 16, the take-up column 17 rotates, thereby adhering the label coated with composite adhesive to the protective film under the combined action of the auxiliary column 10 and the auxiliary column 2 13, and completing the winding. The outer wall of the drive gear 15 is meshed with the outer wall of the take-up column 17. The rear ends of the linkage gear 16 and the feed column 8 both pass through the frame 1 and are fixedly connected to pulleys 18. The outer walls of the two pulleys 18 are provided with belts 19. The rotation of the take-up column 17 drives the pulleys 18 to rotate, and under the drive of the belts 19, the pulleys 18 on the rear side of the feed column 8 rotate together.

[0032] Specifically, the label roll to be coated with composite adhesive is placed above the limiting rod 4, and the label is sequentially wrapped around the turning column 5, limiting plate 9, auxiliary column one 10, and auxiliary column two 13, finally winding around the receiving column 17. Simultaneously, the protective film roll is placed above the dispensing column 8. The composite adhesive flows from the insulated adhesive tank 6 through the dispensing pipe 7, landing on the label. Then, the reduction motor 14 is started, driving the drive gear 15 to rotate. Under the meshing relationship between the drive gear 15 and the linkage gear 16, the receiving column 17 rotates, thus dispensing the label coated with composite adhesive onto the auxiliary column one. When the auxiliary column 10 and auxiliary column 2 13 are combined, they adhere to the protective film and are wound up. At the same time, the rotation of the take-up column 17 drives the pulley 18 to rotate. Driven by the belt 19, the pulley 18 on the back of the feed column 8 rotates together. When laminating different labels, the electric telescopic rod 2 11 is activated, which drives the slider 12 and auxiliary column 2 13 to move up and down, thereby changing the distance between auxiliary column 10 and auxiliary column 2 13, thus controlling the bonding pressure between the multi-layer materials, ensuring that the adhesive plays its full role, and improving the bonding firmness.

[0033] Reference Figure 1 , Figure 4 and Figure 5 The folding mechanism 2 includes a limiting strip 201. The front and rear sides of the limiting strip 201 are fixedly connected to the front and rear ends of the top left side of the inner wall of the frame 1, respectively. An electric telescopic rod 202 is fixedly connected to the right side of the limiting strip 201. A fixing strip 203 is fixedly connected to one end of the electric telescopic rod 202. Sliding blocks 204 are rotatably connected to the bottom front and rear sides of the fixing strip 203. A scraper 205 is slidably connected to the outer wall of the sliding block 204. A pad 206 is fixedly connected to the top of the inner wall of the frame 1. The two scrapers 205 are... The adjacent side is rotatably connected to the top center of the pad 206. When the electric telescopic rod 202 is activated, the fixed strip 203 is moved, and the sliding block 204 is moved. Since the scraper 205 rotates around the pad 206, when the sliding block 204 moves, it will drive the scrapers 205 on both sides to rotate, thereby changing its width in the horizontal direction. Rollers 207 are rotatably connected to the front and rear sides of the right side of the pad 206. The rollers 207 facilitate the label to change angle.

[0034] Specifically, when the label to be coated with glue is relatively narrow, the electric telescopic rod 202 is activated, which in turn moves the fixing strip 203 and the sliding block 204. Since the scraper 205 rotates around the pad 206, when the sliding block 204 moves, it will cause the scrapers 205 on both sides to rotate, thereby changing their width in the horizontal direction. When the glue falls on top, the scraper 205 scrapes it evenly on the label. The roller 207 allows the label to change angle, thus allowing the scraping range of the scraper 205 to be adjusted according to the width of the label.

[0035] Reference Figure 1 , Figure 2 and Figure 4 A temperature sensor 20 is fixedly connected to the front left side of the heat-insulating glue tank 6. The temperature sensor 20 can monitor the temperature of the glue in the heat-insulating glue tank 6 in real time. A liquid level window 21 is opened on the front right side of the heat-insulating glue tank 6. The liquid level window 21 allows the operator to directly observe the liquid level of the glue in the heat-insulating glue tank 6. A sealing sleeve 22 is fixedly connected to the outer wall of the liquid level window 21. The sealing sleeve 22 can prevent the glue from leaking from the gap of the liquid level window 21. The top of the heat-insulating glue tank 6 is connected to the filling pipe 23. The filling pipe 23 can provide a channel for adding glue. The top of the outer wall of the filling pipe 23 is threaded with a pipe cap 24. The pipe cap 24 can prevent external dust and impurities from entering the heat-insulating glue tank 6 through the filling pipe 23. A regulating valve 25 is fixedly connected to the outer wall of the glue outlet pipe 7. The regulating valve 25 can control the flow rate of glue from the heat-insulating glue tank 6 through the glue outlet pipe 7.

[0036] Specifically, the temperature sensor 20 can monitor the temperature of the glue in the insulation glue tank 6 in real time, providing a basis for subsequent temperature control and ensuring that the glue is always in the best working condition. The liquid level window 21 allows operators to easily and intuitively observe the liquid level in the insulation glue tank 6. The sealing sleeve 22 prevents glue from leaking from the gaps in the liquid level window 21, avoiding glue waste and pollution of the working environment. The filling pipe 23 provides a channel for adding glue. The pipe cover 24 prevents external dust and impurities from entering the insulation glue tank 6 through the filling pipe 23 and contaminating the glue. The regulating valve 25 controls the flow rate of glue from the insulation glue tank 6 through the glue outlet pipe 7.

[0037] Reference Figure 1 , Figure 2 and Figure 5A conical collecting block 26 is fixedly connected to the middle of the bottom of the inner wall of the frame 1. The conical collecting block 26 can collect glue and other waste materials that drip or overflow during the gluing and lamination process. The bottom of the front part of the conical collecting block 26 is connected to a discharge pipe 27, which can discharge the waste materials collected by the conical collecting block 26 out of the frame 1. The outer wall of the discharge pipe 27 penetrates the front part of the frame 1. Limiting rings 29 are fixedly connected to the front and rear sides of the left side of the frame 1. The limiting rings 29 can provide a locking mechanism for the 28. The limiting ring 29 has a sliding connection to a retainer 28 on its inner wall, which can engage with the notch block 3 to prevent displacement during operation. A controller 30 is fixedly connected to the middle of the front side of the frame 1. The controller 30 is electrically connected to the electric telescopic rod 11, the geared motor 14 and the electric telescopic rod 202 respectively. The controller 30 can control the starting and running power of the electric telescopic rod 11, the geared motor 14 and the electric telescopic rod 202 respectively.

[0038] Specifically, the conical collecting block 26 can collect glue and other waste materials that drip or overflow during the gluing and lamination process. The waste materials collected by the conical collecting block 26 can be discharged outside the frame 1 through the discharge pipe 27. The limiting ring 29 can provide guidance and limiting for the locking block 28. The locking block 28 can engage with the notch block 3 to prevent displacement during operation. The controller 30 can control the starting and running power of the electric telescopic rod 21, the geared motor 14 and the electric telescopic rod 122 respectively.

[0039] Working principle: First, the label roll to be coated with composite adhesive is placed on the limiting rod 4, guiding the label paper sequentially around the turning column 5, limiting plate 9, auxiliary column one 10, and auxiliary column two 13, finally winding it onto the take-up column 17. Simultaneously, the protective film roll is placed on the dispensing column 8. The composite adhesive flows from the insulated adhesive tank 6, dripping onto the label surface through the dispensing pipe 7. Then, the reduction motor 14 is started, driving the gear 15 to rotate, meshing with the linkage gear 16, causing the take-up column 17 to rotate, and the label paper is then wound around the auxiliary column one 10. Under the combined action of 0 and auxiliary column 2 13, the label coated with composite adhesive is bonded to the protective film, and the winding is completed. The rotation of the take-up column 17 drives the pulley 18 to rotate at the same time. The belt 19 drives the pulley 18 on the back side of the unloading column 8 to rotate together. When bonding different labels, the electric telescopic rod 2 11 is activated, which drives the slider 12 and auxiliary column 2 13 to move up and down, and adjusts the distance between auxiliary column 10 and auxiliary column 2 13 to control the bonding pressure between the multi-layer materials, ensure that the adhesive works fully, and enhance the bonding firmness.

[0040] Furthermore, through the folding mechanism 2, when the width of the label to be glued is small, the electric telescopic rod 202 is activated, thereby driving the fixed strip 203 to move, and at the same time driving the sliding block 204 to move. Since the scraper 205 rotates around the pad 206, when the sliding block 204 moves, it will cause the scrapers 205 on both sides to rotate accordingly, thereby adjusting their width in the horizontal direction. In this way, when the glue falls on top, the scraping action of the scraper 205 can make the glue evenly applied to the label. The roller 207 helps the label change direction, so that the scraping range of the scraper 205 can be adjusted accordingly according to the width of the label.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-layer composite adhesive coating device for environmentally friendly cardboard labels, comprising a frame (1), characterized in that: The inner wall of the frame (1) has recessed blocks (3) slidably connected to both the front and rear sides of the left side. Limiting rods (4) are provided on the inner walls of both recessed blocks (3). A steering column (5) is rotatably connected to the left side of the inner wall of the frame (1). A heat-insulating glue tank (6) is fixedly connected to the top left side of the frame (1). A glue outlet pipe (7) is connected to the bottom end of the heat-insulating glue tank (6). A material discharge column (8) is rotatably connected to the top right side of the frame (1). A limiting plate (9) is fixedly connected to the middle of the inner wall of the frame (1). An auxiliary column (10) is rotatably connected to the middle of the inner wall. An electric telescopic rod (11) is fixedly connected to the front and rear sides of the right side of the inner wall of the frame (1). A slider (12) is fixedly connected to one end of the electric telescopic rod (11). An auxiliary column (13) is rotatably connected to the adjacent side of the two sliders (12). A transmission assembly is provided at the bottom front of the frame (1). A folding mechanism (2) is provided at the top left side of the inner wall of the frame (1). The folding mechanism (2) is used to adjust the scraper (205) according to the required width of the adhesive.

2. The multi-layer composite adhesive coating device for environmentally friendly cardboard labels according to claim 1, characterized in that: The folding mechanism (2) includes a limiting strip (201). The front and rear sides of the limiting strip (201) are fixedly connected to the front and rear ends of the top left side of the inner wall of the frame (1). An electric telescopic rod (202) is fixedly connected to the right side of the limiting strip (201). A fixing strip (203) is fixedly connected to one end of the electric telescopic rod (202). A sliding block (204) is rotatably connected to the front and rear sides of the bottom of the fixing strip (203). A scraper (205) is slidably connected to the outer wall of the sliding block (204). A pad (206) is fixedly connected to the top of the inner wall of the frame (1). The adjacent sides of the two scrapers (205) are rotatably connected to the top center of the pad (206). Rollers (207) are rotatably connected to the front and rear sides of the right side of the pad (206).

3. The multi-layer composite coating device for environmentally friendly cardboard labels according to claim 1, characterized in that: The transmission assembly includes a geared motor (14), the rear side of which is fixedly connected to the front bottom of the frame (1). The output end of the geared motor (14) passes through the frame (1) and is fixedly connected to a drive gear (15). The bottom right side of the inner wall of the frame (1) is rotatably connected to a linkage gear (16). The front end of the outer wall of the linkage gear (16) is fixedly connected to a receiving column (17). The outer wall of the drive gear (15) is meshed with the outer side of the receiving column (17). The rear ends of the linkage gear (16) and the discharge column (8) both pass through the frame (1) and are fixedly connected to pulleys (18). The outer walls of the two pulleys (18) are provided with belts (19).

4. The multi-layer composite coating device for environmentally friendly cardboard labels according to claim 1, characterized in that: A temperature sensor (20) is fixedly connected to the front left side of the thermal insulation glue tank (6), and a liquid level window (21) is opened on the front right side of the thermal insulation glue tank (6). A sealing sleeve (22) is fixedly connected to the outer wall of the liquid level window (21).

5. The multi-layer composite coating device for environmentally friendly cardboard labels according to claim 1, characterized in that: The top of the heat-insulating glue tank (6) is connected to a filling pipe (23), and the top of the outer wall of the filling pipe (23) is threaded with a pipe cap (24). The outer wall of the glue outlet pipe (7) is fixedly connected with a regulating valve (25).

6. The multi-layer composite coating device for environmentally friendly cardboard labels according to claim 1, characterized in that: A conical collecting block (26) is fixedly connected to the middle of the bottom of the inner wall of the frame (1). The bottom front end of the conical collecting block (26) is connected to a discharge pipe (27). The outer wall of the discharge pipe (27) penetrates the front of the frame (1).

7. The multi-layer composite coating device for environmentally friendly cardboard labels according to claim 1, characterized in that: Limiting rings (29) are fixedly connected to the front and rear sides of the left side of the frame (1), and the inner wall of the limiting rings (29) is slidably connected with a locking device (28).

8. The multi-layer composite coating device for environmentally friendly cardboard labels according to claim 2, characterized in that: A controller (30) is fixedly connected to the middle of the front side of the frame (1). The controller (30) is electrically connected to the electric telescopic rod two (11), the geared motor (14), and the electric telescopic rod one (202).