Improved single sheet gluing machine

Abstract

The utility model provides a kind of improved single sheet gluing machine, including rack, the parallelism setting coating roller and two paper rollers of rotation installation in the axis of the said rack, the coating roller is used to transfer glue to the side surface of paper to be overglued, and the paper roller is used to be overglued paper to be compacted in the coating roller surface, the inside of the paper roller is equipped with the electric heating element of preventing its surface water vapor condensation, the electric heating element rotates with the paper roller and is connected with external electricity by the slip ring being equipped in one end of the paper roller.In working process, due to the heat dissipation of hot melt adhesive on coating roller and moisture evaporation, the temperature of surrounding air rises, humidity becomes larger, water vapor is easily condensed on the surface of paper roller, by setting electric heating element in paper roller, paper roller can be heated to set temperature, thereby solve the problem of paper back wetting due to surface water vapor condensation.

Description

Technical Field

[0001] This utility model relates to the technical field of paper gluing equipment, specifically to a single-sheet gluing machine. Background Technology

[0002] Commercially available paper coating equipment typically includes online coating equipment for large-scale continuous production and sheet-fed coating equipment for small-batch, multi-variety production. One common sheet-fed coating machine operates as follows: Because manual paper feeding is usually required, this type of coating equipment is designed with top feeding for ease of operation. The adhesive is stored in a heated glue tank at the bottom. During coating, the gluing roller is partially immersed in the glue tank, and its rolling motion transfers the adhesive to the surface of the coating roller, which is parallel to it, and then from there to the paper surface. The inventors encountered several problems when using this common sheet-fed coating machine: 1. During operation, some papers with printed patterns on the back are prone to printing defects such as wetting, deformation, or damage after coating; 2. The adhesive in the peripheral area of ​​the glue tank gradually deteriorates, resulting in unstable adhesive quality and significant adhesive waste; 3. After coating, the gluing roller and coating roller need to be manually cleaned, making maintenance cumbersome; 4. The adhesive concentration is poorly controlled, affecting the bonding effect.

[0003] 1. After the equipment has been running for a certain period of time, some papers with printed patterns on the back are prone to defects such as wet deformation or damage of the printed patterns after gluing. 2. When the coating roller transfers the glue to the paper surface, the paper surface is prone to missing glue areas due to manual paper feeding force or angle. 3. During the heating and boiling process, the glue in the peripheral area of ​​the glue tank is only stirred by the glue roller in the middle part, while the glue in the peripheral area of ​​the glue tank is not stirred for a long time and is prone to solidification and deterioration, which not only affects the glue application effect, but also wastes a lot of glue. 4. After the glue application is completed, the glue roller and coating roller need to be manually cleaned with hot water, which is cumbersome to maintain. 5. The glue concentration is not controlled in a coarse manner, resulting in inconsistent glue viscosity and affecting the quality of subsequent products. Utility Model Content

[0004] The purpose of this invention is to provide an improved sheet-fed gluing machine to solve many problems existing in the sheet-fed gluing machine in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An improved sheet coating machine includes a frame, a coating roller and two pressure rollers rotatably mounted on the frame and arranged parallel to each other. The coating roller is used to transfer glue to one side surface of the paper to be coated, and the pressure rollers are used to press the paper to be coated onto the surface of the coating roller. The pressure rollers are equipped with heating elements inside to prevent moisture condensation on their surface. The heating elements rotate with the pressure rollers and are electrically connected to the outside through a slip ring located at one end of the pressure rollers.

[0007] In a preferred embodiment, the diameter of the coating roller is 100mm ± 10mm; and the paper pressing roller includes two rollers, the paper pressing roller on the paper output side is located at the top of the vertical center line of the coating roller cross section, and the distance between the paper pressing roller on the paper input side and the paper pressing roller on the paper output side is less than 1 / 4 of the circumference of the coating roller.

[0008] A preferred embodiment further includes an adhesive roller for evenly distributing adhesive on the surface of the coating roller, a glue tank for boiling the adhesive, an adhesive pipeline for pumping the adhesive from the glue tank to the glue inlet side at the junction of the adhesive roller and the coating roller, and a glue receiving trough located below the adhesive roller and the coating roller, the glue receiving trough having a return port communicating with the glue tank.

[0009] In a preferred embodiment, the glue bucket has an inner cylinder for holding glue and an outer cylinder surrounding the inner cylinder. The outer cylinder is used to hold hot water, and the outer cylinder is connected to the glue application pipeline via a three-way switching valve for cleaning the glue application roller and the coating roller.

[0010] In a preferred embodiment, the glue tank is equipped with a gear pump for pumping glue, the gear pump is connected to a motor via a vertical drive shaft, the drive shaft is equipped with blades for agitating the glue, and the motor is located on the top plate of the glue tank.

[0011] In a preferred embodiment, the side wall or bottom surface of the adhesive receiving tank has a hot water tank that communicates with the outer cylinder and is flush with the liquid level, so that the hot water in the outer cylinder simultaneously heats the adhesive in the adhesive receiving tank.

[0012] In a preferred embodiment, the return port of the adhesive receiving tank has a perforated plate for use as a filter plate.

[0013] In a preferred embodiment, the glue bucket is further provided with a concentration detection device. The concentration detection device includes a box body above the glue liquid level, a glue inlet assembly for drawing glue from the glue bucket into the box body, an overflow hole on the box body, and a rotational viscometer, the rotor of which extends into the rotational viscometer below the glue liquid level in the box body.

[0014] In a preferred embodiment, the overflow hole includes a plurality of overflow tubes vertically disposed within the housing, and a plurality of overflow windows opened on the side wall of the housing; the housing includes a top cover, the motor of the rotational viscometer is mounted outside the top cover, and the top of the overflow tubes and the bottom edge of the overflow windows are both higher than the rotor position of the rotational viscometer.

[0015] In a preferred embodiment, the paper-exiting side of the coating roller is further provided with a plurality of paper-peeling claws arranged in parallel against the surface of the coating roller; the tail end of each paper-peeling claw is rotatably mounted on a mounting rod parallel to the coating roller, so that the paper-peeling claw adheres to the surface of the coating roller by its own weight.

[0016] The beneficial effects of this utility model are as follows: 1. During operation, the surrounding air temperature and humidity increase due to heat dissipation and moisture evaporation of the hot melt adhesive on the coating roller, which easily causes water vapor to condense on the surface of the pressure roller. By setting an electric heating element inside the pressure roller, the pressure roller can be heated to a set temperature, thereby solving the problem of surface water vapor condensation wetting the back of the paper; 2. The arrangement of the coating roller and the pressure roller increases the contact area between the paper and the coating roller, solving the problem of insufficient adhesive; 3. By setting up a glue tank, glue application pipeline, and glue receiving tank with a return port, the glue is recycled by boiling and extracting glue, which makes the glue less prone to denaturation due to circulation, improving the glue coating quality and saving glue; 4. The use of hot water in the outer cylinder and automatic flushing through the glue application pipeline facilitates maintenance; 5. The installation of a concentration detection device ensures the stability of the glue concentration during use. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the overall structure of the gluing device in the embodiment;

[0019] Figure 2 This is a schematic diagram of the installation structure of the pressure roller in the embodiment;

[0020] Figure 3 This is a schematic diagram of the vertical cross-sectional structure of the gluing device in the embodiment;

[0021] Figure 4 for Figure 3 A magnified view of part A in the middle;

[0022] Figure 5 This is a schematic diagram of the concentration detection device in the embodiment. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings:

[0024] refer to Figures 1 to 5 An improved sheet coating machine according to this embodiment includes a frame 1, a coating roller 2 and two pressure rollers 3 rotatably mounted on the frame 1 and arranged parallel to each other. The coating roller 2 is used to transfer glue to one side surface of the paper to be coated, and the pressure rollers 3 are used to press the paper to be coated onto the surface of the coating roller 2. The pressure roller 3 is provided with an electric heating element inside to prevent moisture condensation on its surface. The electric heating element rotates with the pressure roller 3 and is electrically connected to the outside through a slip ring 31 provided at one end of the pressure roller 3.

[0025] The inventors discovered that the reason for the dampness on the back of the paper is that the heat dissipation and moisture evaporation of the hot melt adhesive on the coating roller 2 cause the surrounding air temperature to rise and the humidity to increase, making it easy for water vapor to condense on the surface of the pressure roller 3. By installing an electric heating element inside the pressure roller 3, the pressure roller 3 can be heated and maintained within a set temperature range, thereby solving the problem of water vapor condensation on the surface of the pressure roller 3 and wetting the printed pattern on the back of the paper. Since the pressure roller 3 is a component that rotates around its axis during operation, a slip ring 31 is used for rotary contact electrical connection.

[0026] In a preferred embodiment, the diameter of the coating roller 2 is 100mm ± 10mm; and the paper pressing roller 3 includes two rollers. The paper pressing roller 3 on the paper output side is located at the top of the vertical center line of the coating roller 2 cross-section, while the distance between the paper pressing roller 3 on the paper input side and the paper pressing roller 3 on the paper output side is less than 1 / 4 of the circumference of the coating roller 2. On the one hand, compared with the existing structure, the diameter of the coating roller 2 is increased. On the other hand, the arrangement of the two paper pressing rollers 3 allows the paper to adhere to the surface of the coating roller 2 immediately after entering. Compared with the prior art where the two paper pressing rollers 3 are symmetrically arranged on both sides of the top of the coating roller 2, the bonding area between the paper and the coating roller 2 is significantly increased, thereby making the glue application uniform and eliminating areas of insufficient glue.

[0027] In a preferred embodiment, this embodiment further includes an applicator roller 4 for evenly distributing the adhesive on the surface of the coating roller 2, an adhesive tank 5 for boiling the adhesive, an applicator conduit 6 for pumping the adhesive from the adhesive tank 5 to the adhesive inlet side at the junction of the applicator roller 4 and the coating roller 2, and an adhesive receiving trough 7 located below the applicator roller 4 and the coating roller 2, the adhesive receiving trough 7 having a return port 71 communicating with the adhesive tank 5. By setting up the adhesive tank 5, the applicator conduit 6, and the adhesive receiving trough 7 with the return port 71, the adhesive heated and melted in the adhesive tank 5 is pumped between the applicator roller 4 and the coating roller 2, while excess adhesive flows back to the adhesive tank 5 through the adhesive receiving trough 7 for continued use. This method makes the adhesive less prone to denaturation due to circulation, improves the adhesive coating quality, and saves adhesive.

[0028] In a preferred embodiment, the glue tank 5 has an inner cylinder 51 for holding glue and an outer cylinder 52 surrounding the inner cylinder 51. The outer cylinder 52 is used to hold hot water, and it is connected to the glue application pipeline 6 via a three-way switching valve for cleaning the glue application roller 4 and the coating roller 2. The hot water in the outer cylinder 52 can not only be used to heat and melt the glue in the inner cylinder 51, but also be pumped between the glue application roller 4 and the coating roller 2 for cleaning after coating is completed, saving labor and creating a compact structure.

[0029] In a preferred embodiment, the glue tank 5 is equipped with a gear pump 61 for pumping glue. The gear pump 61 is connected to a motor 64 via a vertical drive shaft 62. The drive shaft 62 is equipped with blades 63 for agitating the glue, and the motor 64 is located on the top plate of the glue tank 5. The motor 64 simultaneously drives the blades 63 and the gear pump 61, which not only simplifies the equipment structure but also eliminates the need for a tight seal on the motor 64 as it is located outside the glue tank.

[0030] In a preferred embodiment, the side wall or bottom surface of the adhesive receiving tank 7 has a hot water tank 71 that communicates with the outer cylinder 52 and is flush with the liquid level, so that the hot water in the outer cylinder 52 simultaneously heats the adhesive in the adhesive receiving tank 7. The adhesive receiving tank 7 heats the adhesive entering it by sharing the hot water from the adhesive bucket 5, allowing the adhesive to flow back into the adhesive bucket 5 for circulation as quickly as possible, preventing it from solidifying in the adhesive receiving tank 7.

[0031] In a preferred embodiment, the return port 71 of the glue receiving tank 7 has a perforated plate for use as a filter plate. This allows for the filtering out impurities such as paper residue remaining in the glue.

[0032] In a preferred embodiment, the glue container 5 is further provided with a concentration detection device 8. The concentration detection device 8 includes a housing 81 above the glue level, a glue inlet assembly 84 for drawing glue from the glue container 5 into the housing 81, an overflow hole on the housing 81, and a rotational viscometer 80, the rotor 802 of which extends below the glue level in the housing 81. On one hand, by providing the concentration detection device 8, the glue concentration in the glue container 5 can be known in real time, facilitating timely adjustment. On the other hand, the concentration detection device 8, positioned above the glue level in the glue container 5, can prevent glue-related contamination.

[0033] In a preferred embodiment, the overflow hole includes a plurality of overflow tubes 82 vertically disposed within the housing 81, and a plurality of overflow windows 83 opened on the side wall of the housing 81. The housing 81 includes a top cover 811, and the motor 801 of the rotational viscometer 80 is mounted outside the top cover 811. The top ends of the overflow tubes 82 and the bottom edges of the overflow windows 83 are both higher than the rotor 802 of the rotational viscometer 80. The overflow tubes 82 and the overflow windows 83 allow the glue to drain from the housing 81 in a timely manner, preventing the glue from contacting and damaging the motor 801 of the rotational viscometer 80.

[0034] In a preferred embodiment, the paper-exit side of the coating roller 2 is further provided with a plurality of parallel paper-peeling claws 9 that abut against the surface of the coating roller 2; the tail end of each paper-peeling claw 9 is rotatably mounted on a mounting rod 91 parallel to the coating roller 2, so that the paper-peeling claw 9 adheres to the surface of the coating roller 2 by its own weight. Since the paper-peeling claw 9 abuts against the surface of the coating roller 2 by its own weight, even if there is wear, it will still adhere to the surface of the coating roller 2, thereby avoiding paper rolling.

[0035] The above description does not limit the technical scope of this utility model. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. An improved sheet-fed gluing machine, characterized in that: The device includes a frame, a coating roller and two pressure rollers rotatably mounted on the frame and arranged parallel to each other. The coating roller is used to transfer glue to one side of the paper to be coated, and the pressure rollers are used to press the paper to be coated onto the surface of the coating roller. The pressure rollers are equipped with heating elements inside to prevent moisture condensation on their surface. The heating elements rotate with the pressure rollers and are electrically connected to the outside through a slip ring located at one end of the pressure rollers.

2. The improved sheet-fed gluing machine according to claim 1, characterized in that: The diameter of the coating roller is 100mm ± 10mm; and the paper pressing roller includes two rollers, with the paper pressing roller on the paper output side located at the top of the vertical center line of the coating roller cross section, and the distance between the paper pressing roller on the paper input side and the paper pressing roller on the paper output side is less than 1 / 4 of the circumference of the coating roller.

3. The improved sheet-fed gluing machine according to claim 1, characterized in that: It also includes an adhesive roller for evenly distributing the glue on the surface of the coating roller, a glue tank for boiling the glue, an adhesive pipeline for pumping the glue from the glue tank to the glue inlet side at the junction of the adhesive roller and the coating roller, and a glue receiving trough located below the adhesive roller and the coating roller, the glue receiving trough having a return port communicating with the glue tank.

4. An improved sheet-fed gluing machine according to claim 3, characterized in that: The glue bucket has an inner cylinder for holding glue and an outer cylinder surrounding the inner cylinder. The outer cylinder is used to hold hot water and is connected to the glue application pipeline via a three-way switching valve for cleaning the glue application roller and the coating roller.

5. An improved sheet-fed gluing machine according to claim 4, characterized in that: The glue tank is equipped with a gear pump for pumping glue. The gear pump is connected to a motor via a vertical drive shaft. The drive shaft is equipped with blades for agitating the glue, and the motor is located on the top plate of the glue tank.

6. An improved sheet-fed gluing machine according to claim 4, characterized in that: The side wall or bottom surface of the adhesive receiving tank has a hot water tank that communicates with the outer cylinder and is level with the liquid level, so that the hot water in the outer cylinder can simultaneously heat the adhesive in the adhesive receiving tank.

7. An improved sheet-fed gluing machine according to claim 6, characterized in that: The return port of the glue receiving tank has a perforated plate for use as a filter plate.

8. An improved sheet-fed gluing machine according to claim 3, characterized in that: The glue bucket is also equipped with a concentration detection device, which includes a box body above the glue liquid level, a glue inlet assembly that draws glue from the glue bucket into the box body, an overflow hole on the box body, and a rotational viscometer with the rotor of the rotational viscometer extending into the box body below the glue liquid level.

9. An improved sheet-fed gluing machine according to claim 8, characterized in that: The overflow hole includes several overflow tubes vertically disposed inside the box body, and several overflow windows opened on the side wall of the box body; the box body includes a top cover, the motor of the rotational viscometer is mounted outside the top cover, and the top of the overflow tubes and the bottom edge of the overflow windows are both higher than the rotor position of the rotational viscometer.

10. An improved sheet-fed gluing machine according to claim 1, characterized in that: The paper-exiting side of the coating roller is also provided with several paper-peeling claws arranged in parallel against the surface of the coating roller; the tail end of each paper-peeling claw is rotatably mounted on a mounting rod parallel to the coating roller, so that the paper-peeling claw adheres to the surface of the coating roller by its own weight.

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