Gluing device and paper-plastic composite bag production system

Abstract

The utility model provides a paper-plastic composite bag production system which comprises a gluing device, the gluing device comprises an outer shell, the outer shell is provided with a strip-shaped flat outer gluing opening, the gluing device further comprises an installation pipeline penetrating through the outer shell, and the installation pipeline is provided with an installation section which is parallel to the outer gluing opening and located in the outer shell. A plurality of through holes are formed in the side, facing outwards the gluing opening, of the mounting section in the axial direction of the mounting section, the gluing device further comprises a glue storage barrel, the two ends of the mounting pipeline communicate with the glue storage barrel, and a pump body located outside the outer shell is further arranged on the mounting pipeline. The utility model solves the problem in the prior art that the glue coated on the base film is also distributed unevenly due to the fact that the glue is possibly distributed unevenly on the scraping plate.

Description

Technical Field

[0001] This utility model relates to the technical field of paper-plastic composite bag processing equipment, and in particular to a glue coating device and a paper-plastic composite bag production system. Background Technology

[0002] Paper-plastic composite bags generally have a three-layer structure: an inner layer, an outer layer, and an intermediate adhesive layer for bonding the inner and outer layers. They combine the environmental friendliness of paper with the waterproof and moisture-proof properties of plastic, and are widely used in various industrial and consumer goods sectors. In existing technologies, the processing of paper-plastic composite bags first requires the fabrication of a paper-plastic composite film, followed by slitting, folding, bottom sealing, sewing, and heat sealing. Adhesive application is a crucial step in the processing of the paper-plastic composite film. Current technologies typically use a scraper and a glue storage tank for application. Specifically, the glue (i.e., a uniformly mixed adhesive) is placed in the storage tank and then guided through a pipe to the scraper, where it is indirectly applied to the base film (the side of the inner or outer layer that needs to be bonded). In practice, uneven distribution of the glue on the scraper can lead to uneven distribution of the glue on the base film after coating, potentially resulting in substandard quality of the processed paper-plastic composite film. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides an adhesive application device that solves the problem that uneven distribution of adhesive on the base film can lead to uneven distribution of adhesive due to uneven distribution of adhesive on the scraper.

[0004] According to an embodiment of this utility model, an adhesive coating device includes a housing with a strip-shaped flat external adhesive coating port, and an installation pipe penetrating the housing. The installation pipe has an installation section parallel to the external adhesive coating port and located within the housing. Multiple through holes are arranged axially along the side of the installation section facing the external adhesive coating port. The device also includes an adhesive storage tank. Both ends of the installation pipe are connected to the adhesive storage tank, and a pump body located outside the housing is installed on the installation pipe. Adhesive is introduced from the adhesive storage tank into the installation section via the pump body, then enters the housing through the through holes, and is indirectly discharged from the external adhesive coating port to achieve adhesive coating. This results in a more uniform distribution of adhesive along the external adhesive coating port within the housing, thus making the adhesive coating more uniform. This ultimately solves the problem in the prior art where uneven distribution of adhesive on the scraper leads to uneven adhesive distribution on the base film.

[0005] Furthermore, the inner diameter of the installation section is gradually varied, and the inner diameter of the end closest to the pump body is larger than that of the other end.

[0006] Furthermore, the installation section is also fixedly connected to a discharge shell, and all through holes are located inside the discharge shell. The discharge shell also has a flat inner discharge port that is directly opposite the outer glue outlet.

[0007] Furthermore, the outer shell is provided with a first arc-shaped inner wall and a second arc-shaped inner wall opposite to the first arc-shaped inner wall, and the distance between the first arc-shaped inner wall and the second arc-shaped inner wall gradually decreases from top to bottom.

[0008] Furthermore, the inner wall with the inner outlet facing downwards is provided with a first arc-shaped inner wall.

[0009] Furthermore, the discharge shell includes an inlet section that communicates with each through hole, and a discharge section that communicates with all inlet sections, with the inner dispensing port located on the discharge section.

[0010] Furthermore, the through holes are arranged at equal intervals on the mounting section.

[0011] Furthermore, the import section has a flared design.

[0012] According to an embodiment, a paper-plastic composite bag production system is also provided, which includes the above-described adhesive coating device.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The adhesive is applied through the outer casing. Multiple through holes in the mounting section inside the casing allow the adhesive to be introduced into the casing more evenly, and then indirectly discharged from the outer adhesive port. This makes the adhesive distribution more even as it enters the casing, resulting in more uniform adhesive application. This solves the problem in the prior art where uneven distribution of adhesive on the scraper leads to uneven distribution of adhesive on the base film. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the outer shell according to an embodiment of the present utility model;

[0017] Figure 3 for Figure 1 Enlarged schematic diagram of a local structure at point A;

[0018] In the above attached figures:

[0019] 1. Outer casing; 2. Outer glue inlet; 3. Installation pipe; 4. Installation section; 5. Glue storage tank; 6. Pump body; 7. Discharge shell; 8. Inner glue outlet; 9. Inlet section; 10. Discharge section; 11. First arc-shaped inner wall; 12. Second arc-shaped inner wall. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] In an exemplary implementation, such as Figure 1-3 As shown, this embodiment provides a paper-plastic composite bag production system. The production line includes a coating device, which includes an outer shell 1 with a strip-shaped flat outer coating port 2. The coating device also includes an installation pipe 3 penetrating the outer shell 1. The installation pipe 3 has an installation section 4 parallel to the outer coating port 2 and located inside the outer shell 1. Multiple through holes are provided along the axial direction on the side of the installation section 4 facing the outer coating port 2. The coating device also includes a glue storage tank 5. Both ends of the installation pipe 3 are connected to the glue storage tank 5, and a pump body 6 located outside the outer shell 1 is also provided on the installation pipe 3. Similar to existing technologies, the adhesive is stored in a storage tank 5. The adhesive is pumped into the installation pipe 3 via a pump body 6. As it flows through the installation section 4, the adhesive is introduced into the outer casing 1 through various through-holes, and then indirectly discharged from the external adhesive port 2 for application. During this process, the adhesive is more evenly distributed along the external adhesive port 2 within the outer casing 1, resulting in more uniform adhesive application. This ultimately solves the problem in existing technologies where uneven adhesive distribution on the scraper leads to uneven adhesive distribution on the base film. More specifically, in this solution, the installation pipe 3 and the storage tank 5 are connected in a loop, allowing for more uniform adhesive flow. Furthermore, the inner diameter of the installation section 4 is gradually varied, with the inner diameter at the end closest to the pump body 6 being larger than the other end. This allows the adhesive to gradually exit through various through-holes during flow, maintaining a relatively constant flow rate between subsequent and preceding through-holes. After passing through the last through-hole, the remaining portion returns to the storage tank 5, further contributing to a more uniform overall adhesive distribution.

[0023] like Figure 1-3As shown, in a further embodiment, the mounting section 4 is also fixedly connected to a discharge shell 7, and all through holes are located inside the discharge shell 7. The discharge shell 7 also has a flat inner discharge port 8 directly opposite the outer glue outlet 2. The glue first enters the discharge shell 7 through the through holes, and then indirectly enters the outer shell 1. The discharge shell 7 is also a flat structure, and the glue gradually becomes flatter and wider as it flows through, thus connecting laterally. This helps to make the glue distribution more uniform. In particular, the through holes are equidistantly arranged, which also makes the glue distribution more uniform. Furthermore, the discharge shell 7 includes an inlet section 9 that communicates with each through hole, and a discharge section 10 that communicates with all inlet sections 9. The inner discharge port 8 is located on the discharge section 10, where the inlet section 9 has a flared structure, that is, the end of the inlet section 9 that connects to the mounting section 4 is smaller. In this way, the glue gradually flattens as it flows through, and finally connects together in the discharge section 10, and is more evenly introduced into the outer shell 1.

[0024] like Figure 2 As shown, the outer shell 1 is provided with a first arc-shaped inner wall 11 and a second arc-shaped inner wall 12 opposite to the first arc-shaped inner wall 11. The distance between the first arc-shaped inner wall 11 and the second arc-shaped inner wall 12 gradually decreases from top to bottom, that is, the outer shell 1 as a whole gradually flattens. The width is the smallest at the outer glue outlet 2, so that the glue can be evenly discharged to achieve uniform glue application. Furthermore, the inner glue outlet 8 is set facing downwards towards the first arc-shaped inner wall 11. In this way, the glue is discharged through the discharge shell 7 towards the first arc-shaped inner wall 11 and then flows towards the outer glue outlet 2, and finally discharged to achieve glue application.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A glue-applying device, characterized in that, The device includes an outer casing with a strip-shaped flat external adhesive inlet, and an installation pipe penetrating the outer casing. The installation pipe has an installation section parallel to the external adhesive inlet and located inside the outer casing. The installation section has multiple through holes along its axial direction on the side facing the external adhesive inlet. The device also includes an adhesive storage tank. Both ends of the installation pipe are respectively connected to the adhesive storage tank, and a pump body located outside the outer casing is also provided on the installation pipe.

2. The adhesive applicator as described in claim 1, characterized in that, The inner diameter of the installation section is gradually changed, and the inner diameter of the end closest to the pump body is larger than that of the other end.

3. The adhesive applicator as described in claim 1, characterized in that, The mounting section is also fixedly connected to a discharge shell, and all the through holes are located inside the discharge shell. The discharge shell also has a flat inner discharge port that is directly opposite the outer glue outlet.

4. The adhesive applicator as described in claim 3, characterized in that, The outer shell is provided with a first arc-shaped inner wall and a second arc-shaped inner wall opposite to the first arc-shaped inner wall, and the distance between the first arc-shaped inner wall and the second arc-shaped inner wall gradually decreases from top to bottom.

5. The adhesive applicator as described in claim 4, characterized in that, The inner outlet is positioned downwards on the first arc-shaped inner wall.

6. The adhesive applicator as described in claim 3, characterized in that, The discharge shell includes an inlet section communicating with each of the through holes, and a discharge section communicating with all of the inlet sections, with the inner dispensing port disposed on the discharge section.

7. The adhesive applicator as described in claim 6, characterized in that, The through holes are arranged at equal intervals on the mounting section.

8. The adhesive applicator as described in claim 6, characterized in that, The inlet section has a flared structure.

9. A paper-plastic composite bag production system, characterized in that, Includes the adhesive applicator as described in any one of claims 1-8.

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