A defoaming device for film laminating machine

Abstract

The present invention discloses a defoaming device for a film laminating machine, belonging to the field of packaging bag laminating technology. The device comprises a frame, on which an unwinding assembly, a five-roller gluing system, and a laminating assembly are disposed. A defoaming device is disposed between the five-roller gluing system and the laminating assembly, and the defoaming device sequentially comprises an air jet assembly and a bubble pricking assembly. The defoaming device for a film laminating machine of the present invention blows air into the glue layer area of ​​the coated substrate or composite through an air nozzle, forming a plurality of staggered C-shaped glue accumulation areas, causing bubbles dispersed in the glue layer to gather at the top or edge of the glue layer. The bubbles are then punctured by a bubble pricking roller and smoothed by a scraper.

Description

Technical Field

[0001] The invention relates to the technical field of packaging bag compounding, in particular to a defoaming device for a film compounding machine. Background Art

[0002] The solvent-free laminating machine for packaging bag production is an environmentally friendly and efficient device designed specifically for the flexible packaging industry. It abandons the harmful solvents used in traditional solvent-based lamination processes and uses solvent-free adhesives to firmly laminate various substrates (such as plastic film, paper, aluminum foil, etc.). Its five-roller gluing system enables uniform adhesive coating, and the coating thickness can be as low as 1-3 microns.

[0003] The packaging bag is usually compounded by coating glue A on the substrate and glue B on the composite, and then compounding the substrate and the composite into one through a compounding device. However, in actual production, it is found that when glue A or glue B is output to the five-roller coating system through a pump, a small amount of air will be mixed in to form bubbles. The bubbles will not disappear during the coating process, and will form tiny bubbles or white spots on the bag after the substrate and the composite are compounded, resulting in uneven quality of bags in the same batch.

[0004] In view of the above problems, a technical solution for a defoaming device for a film laminating machine is proposed. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the prior art and to propose a defoaming device for a film laminating machine.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: a defoaming device for a film laminating machine, comprising a frame, on which an unwinding assembly, a five-roller gluing system and a laminating assembly are arranged, a defoaming system is arranged between the five-roller gluing system and the laminating assembly, and the defoaming system sequentially comprises an air jet assembly and a bubble pricking assembly;

[0007] The jet assembly includes an air pump, an air delivery pipe, and a plurality of air nozzles distributed in a row. The air pump is fixedly mounted on a frame. The air delivery pipes are respectively connected to the air pump and the plurality of air nozzles. The plurality of air nozzles are evenly arranged along the width direction of the substrate or composite and on one side of the adhesive layer of the substrate or composite. The frame is provided with an adjustment assembly for controlling the angle between the air outlet of the air nozzle and the adhesive layer of the substrate or composite.

[0008] The pricking assembly includes a pricking roller and a driving motor, wherein the driving motor is fixedly arranged on a frame, the pricking roller is connected to the driving motor and is rotatably arranged on the frame, and the direction of rotation of the pricking roller is opposite to the direction in which the substrate or the composite is running;

[0009] A scraper is fixedly provided on one side of the bubble roller close to the composite component, and the bottom end of the scraper is in contact with the substrate or the adhesive layer of the composite;

[0010] When the air nozzle blows air toward the adhesive layer of the substrate or composite, the adhesive layer will form several staggered C-shaped adhesive accumulation areas, causing bubbles to gather at the top or edge of the adhesive accumulation area. The bubble roller punctures the bubbles in the adhesive accumulation area, and the scraper flattens the adhesive layer.

[0011] The present invention is further configured as follows: the adjustment component includes a servo motor and a stop disc, the servo motor is fixedly arranged on the frame, the output shaft of the servo motor is connected to the air nozzle, the stop disc is fixedly arranged on the end face of the servo motor close to the air nozzle, and the stop disc is provided with a limit switch toward the direction of the air nozzle, and the limit switch is used to control the air nozzle to be in a direction perpendicular or parallel to the running direction of the substrate or the composite.

[0012] The present invention is further configured as follows: an optical detection instrument for detecting bubble distribution and controlling air jetting from an air nozzle is provided at the outlet of the five-roller gluing system.

[0013] The present invention is further configured as follows: the optical detection instrument includes a light-emitting plate, a light-receiving plate and a data processing system, the light-emitting plate is fixedly mounted on the side of the substrate or composite not coated with glue, the light-receiving plate is fixedly mounted on the side of the substrate or composite coated with glue, and the data processing system is fixedly arranged on one side of the frame and is electrically connected to the light-receiving plate and the air pump.

[0014] The present invention is further configured as follows: the bubble roller is evenly provided with a plurality of spikes along its circumferential direction, the spikes are needle-like structures with a height of 0.2-0.5 mm, and the surface of the spikes is covered with a polytetrafluoroethylene coating.

[0015] The present invention is further configured as follows: pneumatic cylinders for adjusting the distance between the bubble roller and the printing material or composite and the pressure of the bubble roller on the glue layer are arranged on both sides of the frame near the bubble roller, and the output end of the pneumatic cylinder is rotatably connected to the bubble roller.

[0016] The present invention is further configured as follows: the scraper is made of a flexible silicone material, and the contact angle between the end of the scraper and the adhesive layer is 60°-75°.

[0017] In summary, the present invention has the following beneficial effects: air is blown toward the adhesive layer area of ​​the coated substrate or composite through an air nozzle to form a plurality of staggered C-shaped adhesive accumulation areas, so that bubbles dispersed in the adhesive layer are gathered at the top or edge of the adhesive layer, and the bubbles are punctured by a bubble roller and smoothed by a scraper. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2It is a partial structural diagram of the air jet assembly, the bubble assembly and the scraper of the present invention;

[0020] Figure 3 for Figure 2 Schematic diagram of the structure at A in the middle;

[0021] Figure 4 for Figure 2 Schematic diagram of the structure at B in the middle;

[0022] Figure 5 It is a schematic cross-sectional view of a local structure of the present invention;

[0023] Figure 6 This is a schematic diagram of the state of the printing substrate or composite after passing through the air jet component, the bubble component and the scraper.

[0024] In the figure: 1. Frame; 11. Unwinding assembly; 12. Five-roller gluing system; 13. Composite assembly; 2. Jet assembly; 21. Air pump; 22. Air pipe; 23. Air nozzle; 3. Bubble assembly; 31. Bubble roller; 311. Spikes; 32. Drive motor; 4. Scraper; 5. Adjustment assembly; 51. Servo motor; 52. Stop disk; 6. Pneumatic cylinder; 7. Light-emitting board; 8. Light-receiving board; 9. Data processing system. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. Obviously, the embodiments described are only some embodiments of the present invention, rather than all embodiments.

[0026] A defoaming device for a film laminating machine, such as Figures 1-6 As shown, the frame 1 is provided with an unwinding component 11, a five-roller gluing system 12 and a compounding component 13. The unwinding component 11, the five-roller gluing system 12 and the compounding component 13 are conventional designs on film compounding machines and will not be elaborated here. In the existing film compounding machine, when compounding, the substrate and the compound are respectively fixed on the unwinding components 11 on both sides of the frame 1 and transported toward the five-roller gluing system 12. After transfer by the five-roller gluing system 12, glue A is coated on the substrate or glue B is coated on the compound to form a glue layer, and then a composite film is formed through the compounding component 13. In this process, a large number of bubbles exist in the glue layer, which can easily lead to tiny bubbles or white spots in the formed composite film.

[0027] Therefore, a defoaming system is provided between the five-roller gluing system 12 and the composite assembly 13. The defoaming system includes an air jet assembly 2 and a bubble pricking assembly 3 in sequence. The air jet assembly 2 includes an air pump 21, an air delivery pipe 22, and a plurality of air nozzles 23 distributed in a row. The air pump 21 is fixedly arranged on the frame 1. The air delivery pipe 22 is respectively connected to the air pump 21 and the plurality of air nozzles 23. The plurality of air nozzles 23 are evenly arranged along the width direction of the substrate or composite and are located on one side of the adhesive layer of the substrate or composite.

[0028] The pricking assembly 3 includes a pricking roller 31 and a drive motor 32. The drive motor 32 is fixedly mounted on the frame 1. The pricking roller 31 is connected to the drive motor 32 and is rotatably mounted on the frame 1. The direction of rotation of the pricking roller 31 is opposite to the direction of movement of the substrate or composite. A scraper 4 is provided on the side of the pricking roller 31 close to the composite assembly 13, and the bottom end of the scraper 4 is in contact with the adhesive layer of the substrate or composite.

[0029] like Figure 6 As shown, after the substrate or composite is coated by the five-roller gluing system 12, when the air nozzle 23 blows air toward the glue layer of the substrate or composite, the glue layer will be driven by the gas to form a plurality of staggered C-shaped glue accumulation areas. The gas flows on the surface of the glue layer, forming a velocity gradient on the surface of the glue layer, which creates an upward shear force on the bubbles, causing the bubbles to gather toward the top or edge of the glue accumulation area at the same time as the C-shaped glue accumulation area is formed. The bubbles are then punctured by the bubble roller 31 and finally the glue layer is scraped flat by the scraper 4.

[0030] like Figure 2 as well as Figure 5 As shown, in order to improve the adaptability of the process, an adjustment component 5 for controlling the angle between the air outlet of the air nozzle 23 and the adhesive layer of the substrate or composite is provided on the frame 1. The adjustment component 5 includes a servo motor 51 and a stop plate 52. The servo motor 51 is fixedly arranged on the frame 1, and its output shaft is connected to the air nozzle 23. The stop plate 52 is fixedly arranged on the end face of the servo motor 51 close to the air nozzle 23. The stop plate 52 is provided with a limit switch toward the direction of the air nozzle 23. The limit switch is used to control the air nozzle 23 to be in a direction perpendicular or parallel to the running direction of the substrate or composite.

[0031] The air nozzle 23 is driven to rotate by the servo motor 51, and the angle at which the air nozzle 23 blows air to the adhesive layer is adjusted so that the bubbles can flow better in the adhesive layer. The limit switch on the anti-rotation disk 52 is used to limit the maximum rotation angle of the air nozzle 23 to ensure that the air outlet of the air nozzle 23 always acts on the adhesive layer, so that the device can adapt to different adhesive layer thicknesses or film thicknesses.

[0032] like Figure 1 、 Figure 2 、 Figure 3 as well as Figure 5As shown, considering the need to detect bubbles so that the air nozzle 23 can better blow air to the area where the bubbles are more concentrated, an optical detection instrument for detecting the bubble distribution and controlling the air nozzle 23 to eject air is provided at the outlet of the five-roller gluing system 12. The optical detection instrument includes a light-emitting plate 7, a light-receiving plate 8 and a data processing system 9. The light-emitting plate 7 is fixedly mounted on the side of the substrate or composite not coated with glue, the light-receiving plate 8 is fixedly mounted on the side of the substrate or composite coated with glue, and the data processing system 9 is fixedly arranged on one side of the frame 1 and is electrically connected to the light-receiving plate 8 and the air pump 21.

[0033] Spectrophotometry is used between the light-emitting plate 7 and the light-receiving plate 8. Monochromatic light is emitted by the light-emitting plate 7, and the light-receiving plate 8 receives the light intensity that penetrates the substrate or composite. The data on the light-receiving plate 8 is collected and identified by the data processing system 9. When there are bubbles in the glue layer on the substrate or composite, the bubbles form an air / colloid interface in the glue layer. When light passes through, it will be emitted and refracted at the interface, resulting in the transmittance of the bubble area being lower than the transmittance of the bubble-free area. The data processing system 9 will identify this area as a bubble concentration area and adjust the gas intensity of the air pump 21 to the air nozzle 23 there, so as to better make the bubbles dispersed in the glue layer converge to the top and edge of the glue stacking area.

[0034] like Figure 2 as well as Figure 4 As shown, the bubble roller 31 is evenly provided with a number of spikes 311 along its circumferential direction. The spikes 311 are needle-like structures with a height of 0.2-0.5 mm. The surface of the spikes 311 is covered with a polytetrafluoroethylene coating. The needle-like structure can puncture bubbles well, and the polytetrafluoroethylene coating applied thereon can also effectively prevent glue from sticking to the spikes 311.

[0035] like Figure 2 as well as Figure 5 As shown, further, a pneumatic cylinder 6 for adjusting the distance between the bubble roller 31 and the printing material or composite and the pressure of the bubble roller 31 on the glue layer is provided on the frame 1 near both sides of the bubble roller 31, and the output end of the pneumatic cylinder 6 is rotatably connected to the bubble roller 31.

[0036] The distance between the bubble roller 31 and the substrate or composite and the pressure of the bubble roller 31 on the glue layer are adjusted by the pneumatic cylinder 6 to prevent the bubble roller 31 from damaging the substrate or composite and to avoid glue overflow due to excessive squeezing.

[0037] In this embodiment, the scraper 4 is made of flexible silicone material, and the contact angle between the end of the scraper 4 and the glue layer is 60°-75°. The flexible silicone material can reduce the risk of scratching, and the contact angle of 60°-75° can not only ensure the flatness of the glue layer, but also avoid excessive squeezing that causes glue overflow.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0039] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A defoaming device for a film laminating machine, comprising a frame (1), an unwinding assembly (11), a five-roller gluing system (12) and a laminating assembly (13) being arranged on the frame (1), a defoaming system being arranged between the five-roller gluing system (12) and the laminating assembly (13), the defoaming system sequentially comprising an air jet assembly (2) and a bubble pricking assembly (3), characterized in that: The jet assembly (2) comprises an air pump (21), an air delivery pipe (22) and a plurality of air nozzles (23) arranged in a row, the air pump (21) being fixedly mounted on the frame (1), the air delivery pipe (22) being respectively connected to the air pump (21) and the plurality of air nozzles (23), the plurality of air nozzles (23) being evenly arranged along the width direction of the substrate or the composite and being located on one side of the adhesive layer of the substrate or the composite, and an adjustment assembly (5) for controlling the angle between the jetting direction of the air nozzle (23) and the adhesive layer of the substrate or the composite is disposed on the frame (1); The pricking assembly (3) comprises a pricking roller (31) and a driving motor (32), wherein the driving motor (32) is fixedly arranged on the frame (1), the pricking roller (31) is connected to the driving motor (32) and is rotatably arranged on the frame (1), and the rotation direction of the pricking roller (31) is opposite to the running direction of the substrate or the composite; A scraper (4) is provided behind the bubble roller (31), and the bottom end of the scraper (4) is in contact with the adhesive layer of the substrate or the composite; When the air nozzle (23) blows air toward the adhesive layer of the substrate or composite, the adhesive layer forms a plurality of staggered C-shaped adhesive accumulation areas, causing bubbles to gather toward the top or edge of the adhesive accumulation area. The bubble roller (31) punctures the bubbles in the adhesive accumulation area, and the scraper (4) flattens the adhesive layer.

2. The defoaming device for a film laminating machine according to claim 1, characterized in that: The adjustment assembly (5) comprises a servo motor (51) and a stop disc (52), wherein the servo motor (51) is fixedly mounted on the frame (1), the output shaft of the servo motor (51) is connected to the air nozzle (23), the stop disc (52) is fixedly mounted on the end face of the servo motor (51) close to the air nozzle (23), and a limit switch is arranged on the stop disc (52) in the direction of the air nozzle (23), wherein the limit switch is used to control the air nozzle (23) to be in a direction perpendicular to or parallel to the running direction of the substrate or the composite.

3. The defoaming device for a film laminating machine according to claim 1, characterized in that: An optical detection instrument for detecting bubble distribution and controlling the air jet of the air nozzle (23) is provided at the outlet of the five-roller gluing system (12).

4. The defoaming device for a film laminating machine according to claim 3, characterized in that: The optical detection instrument comprises a light-emitting plate (7), a light-receiving plate (8) and a data processing system (9); the light-emitting plate (7) is fixedly mounted on the side of the substrate or composite material not coated with glue; the light-receiving plate (8) is fixedly mounted on the side of the substrate or composite material coated with glue; and the data processing system (9) is fixedly arranged on one side of the frame (1) and is electrically connected to the light-receiving plate (8) and the air pump (21).

5. The defoaming device for a film laminating machine according to claim 1, characterized in that: The bubble roller (31) is evenly provided with a plurality of spikes (311) along its circumferential direction. The spikes (311) are needle-shaped structures with a height of 0.2-0.5 mm. The surface of the spikes (311) is covered with a polytetrafluoroethylene coating.

6. A defoaming device for a film laminating machine according to any one of claims 1 or 5, characterized in that: Pneumatic cylinders (6) for adjusting the distance between the pricking roller (31) and the printing material or the composite material and the pressure of the pricking roller (31) on the adhesive layer are provided on both sides of the frame (1) near the pricking roller (31), and the output end of the pneumatic cylinder (6) is rotatably connected to the pricking roller (31).

7. The defoaming device for a film laminating machine according to claim 1, characterized in that: The scraper (4) is made of a flexible silicone material, and the contact angle between the end of the scraper (4) and the adhesive layer is 60°-75°.

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