Coating device for kraft paper protective film

Abstract

The utility model relates to the technical field of kraft paper protective film production, in particular to a coating device for a kraft paper protective film. The coating device comprises a coating box, a pair of tensioning guide mechanisms and a coating mechanism, the coating mechanism comprises a glue roller, a glue control assembly, a liquid inlet assembly, a pair of protective film guide assemblies, a movement control assembly and a first motor; the glue control assembly comprises a first two-way lead screw transversely and rotatably arranged in the glue roller, a pair of push plates symmetrically arranged at the two ends of the first two-way lead screw in a sleeving mode and connected with the first two-way lead screw in a threaded mode, and a pair of telescopic rods symmetrically and fixedly arranged between the two push plates; the outer side wall of the push plate abuts against the inner side wall of the glue roller. The glue dispersing area can be adjusted according to the width of kraft paper, and therefore glue waste is reduced.

Description

Technical Field

[0001] This utility model relates to the field of kraft paper protective film production technology, and in particular to a coating device for kraft paper protective film. Background Technology

[0002] Kraft paper is commonly used as a packaging material. It has high strength and is generally yellowish-brown. Kraft paper protective film refers to a high-viscosity film formed by uniformly applying glue mixed in a certain proportion to the surface of kraft paper using a coating device.

[0003] To reduce glue waste, the existing coating device adjusts the glue spraying amount according to the width of the kraft paper. However, this presents certain problems in actual operation. Although the existing device adjusts the glue spraying amount according to the width of the kraft paper, the size of the coating roller is fixed. If only the glue spraying amount is reduced, the glue will be evenly distributed on the coating roller. However, some glue on the outer side will not be able to be coated onto the kraft paper, and the amount of glue on the coating roller in the kraft paper contact area will be reduced. This results in insufficient glue on the kraft paper, which affects the forming quality of the high-viscosity film. Utility Model Content

[0004] To address the aforementioned problems, the present invention aims to provide a coating device for kraft paper protective film, which can adjust the area of ​​adhesive dispersion according to the width of the kraft paper, thereby reducing adhesive waste.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A coating apparatus for kraft paper protective film includes a coating box, a pair of tensioning guide mechanisms centrally symmetrically arranged within the coating box, and a coating mechanism disposed between the two tensioning guide mechanisms within the coating box. The coating box has an inlet on one side and an outlet on the other side. The coating mechanism includes a glue roller laterally rotatable within the coating box, a glue control component disposed within the glue roller and used to limit the glue dispersion area, a liquid inlet component disposed on one side of the coating box with one end passing through the glue control component and extending into the glue roller, and a pair of protective film guides symmetrically sleeved outside the glue roller and used to guide the protective film. The system includes a moving control assembly located outside the coating box for driving the glue control assembly and the protective film guiding assembly, and a first motor fixed to the outer wall of the coating box with its driving end passing through the side wall and fixedly connected to the end of the glue roller shaft. The glue control assembly includes a first bidirectional lead screw that is laterally rotatable inside the glue roller and whose one end passes through the movable end of the glue roller and the side wall of the coating box and extends to the outside of the coating box; a pair of push plates symmetrically sleeved at both ends of the first bidirectional lead screw and threadedly connected to the first bidirectional lead screw; and a pair of telescopic rods symmetrically fixed between the two push plates. The outer wall of the push plate abuts against the inner wall of the glue roller.

[0007] More preferably, the protective film guiding assembly includes a second bidirectional lead screw that is laterally rotatably disposed above the glue roller in the coating box, and a pair of guide plates symmetrically sleeved at both ends of the second bidirectional lead screw and threadedly connected to the second bidirectional lead screw; the glue roller passes through the lower part of the guide plates, and the guide plates slide along the length direction of the glue roller; the thread directions of the first bidirectional lead screw and the second bidirectional lead screw are opposite.

[0008] More preferably, the motion control assembly includes a first gear rotatably disposed on the outer wall of the coating box and fixedly sleeved outside the first bidirectional lead screw; a second gear rotatably disposed on the outer wall of the coating box and whose shaft end passes through the side wall of the coating box and is fixedly connected to the shaft end of the second bidirectional lead screw; a mounting bracket fixed to the outer wall of the coating box and covering the second gear; and a second motor fixed to the outer wall of the mounting bracket and whose drive end passes through the mounting bracket and is fixed to the shaft end of the second gear; the first gear and the second gear mesh with each other.

[0009] More preferably, the liquid inlet assembly includes a liquid storage tank fixed to one side of the coating box, a connecting pipe for connecting the liquid storage tank and the inside of the coating roller, a spray head fixed to the liquid outlet end of the connecting pipe, and a liquid pump connected to the connecting pipe and located outside the coating box; the liquid outlet end of the connecting pipe passes through the first bidirectional lead screw from the end of the first bidirectional lead screw, then passes through the middle of the first bidirectional lead screw and extends into the inside of the coating roller.

[0010] More preferably, the connecting pipe is provided with a one-way valve inside the glue roller at one end for controlling the one-way flow of liquid from the connecting pipe into the glue roller.

[0011] More preferably, the tensioning guide mechanism includes a linear actuator vertically disposed within the coating box and a tensioning roller horizontally disposed within the coating box and fixedly connected to the driving end of the linear actuator.

[0012] More preferably, the sidewall of the glue roller is provided with a plurality of transversely arranged discharge channels, and a liquid guide strip for guiding the glue is fixed inside the glue roller between two adjacent discharge channels; the height of the liquid guide strip gradually decreases from the middle to both sides.

[0013] This utility model has the following beneficial effects:

[0014] 1. This utility model utilizes the rotation of the first bidirectional lead screw, which, under the constraint of the telescopic rod, causes the two push plates to move along the length of the first bidirectional lead screw, thereby changing the distance between the two push plates. This allows for adjustment of the area where the adhesive can be dispersed according to the width of the kraft paper. On the one hand, it minimizes the waste of adhesive caused by the adhesive flowing to both sides of the kraft paper when the width of the kraft paper changes. On the other hand, it also minimizes the impact on the quality of high-viscosity films caused by changes in adhesive content per unit area due to the adhesive roller not changing its coverage length after the adhesive is adjusted according to the width of the kraft paper.

[0015] 2. This utility model can drive the two guide plates to move along the length direction of the second bidirectional lead screw by rotating the second bidirectional lead screw, so that the kraft paper is located between the two guide plates, which can limit the kraft paper and prevent it from shifting during the gluing process. Attached Figure Description

[0016] Figure 1 Schematic cross-section of the coating apparatus Figure 1 ;

[0017] Figure 2 Schematic cross-section of the coating apparatus Figure 2 ;

[0018] Figure 3 This is a side cross-sectional view of the coating apparatus;

[0019] Figure 4 This is an enlarged view of the structure at point A;

[0020] Figure 5 This is a side cross-sectional view of the coating apparatus.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Coating box; 11. Inlet; 12. Outlet;

[0023] 2. Tensioning guide mechanism; 21. Linear actuator; 22. Tensioning roller;

[0024] 3. Coating mechanism;

[0025] 31. Glue roller; 311. Discharge channel; 312. Liquid guide strip;

[0026] 32. Glue control assembly; 321. First bidirectional lead screw; 322. Push plate; 323. Telescopic rod;

[0027] 33. Liquid inlet assembly; 331. Liquid storage tank; 332. Connecting pipe; 333. Dispensing head; 334. Liquid pump; 335. Check valve;

[0028] 34. Protective film guide assembly; 341. Second bidirectional lead screw; 342. Guide plate;

[0029] 35. Motion control component; 351. First gear; 352. Second gear; 353. Mounting bracket; 354. Second motor;

[0030] 36. First motor. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] A coating apparatus for kraft paper protective film includes a coating box 1, a pair of tensioning guide mechanisms 2 centrally symmetrically arranged within the coating box 1, and a coating mechanism 3 disposed between the two tensioning guide mechanisms 2 within the coating box 1. The coating box 1 has an inlet 11 on one side and an outlet 12 on the other side. The coating mechanism 3 includes a glue roller 31 laterally rotatable within the coating box 1, a glue control component 32 disposed within the glue roller 31 for limiting the glue dispersion area, a liquid inlet component 33 disposed on one side of the coating box 1 with one end passing through the glue control component 32 and extending into the glue roller 31, a pair of protective film guide components 34 symmetrically sleeved outside the glue roller 31 for guiding the protective film, and a coating mechanism 3 disposed between the two tensioning guide mechanisms 2 within the coating box 1. The coating box 1 includes a moving control component 35 for driving the glue control component 32 and the protective film guide component 34 to move, and a first motor 36 fixed to the outer wall of the coating box 1 with its driving end passing through the side wall and fixedly connected to the shaft end of the glue roller 31. The glue control component 32 includes a first bidirectional lead screw 321 that is laterally rotatable inside the glue roller 31 and one end of which passes through the movable end of the glue roller 31 and the side wall of the coating box 1 and extends to the outside of the coating box 1, a pair of push plates 322 that are symmetrically sleeved at both ends of the first bidirectional lead screw 321 and threaded to the first bidirectional lead screw 321, and a pair of telescopic rods 323 that are symmetrically fixed between the two push plates 322. The outer wall of the push plate 322 abuts against the inner wall of the glue roller 31.

[0033] By rotating the first bidirectional lead screw 321 and restricting it with the telescopic rod 323, the two push plates 322 move along the length direction of the first bidirectional lead screw 321, thereby changing the distance between the two push plates 322. This allows for adjustment of the area where the adhesive can be dispersed according to the width of the kraft paper. On the one hand, this avoids the waste of adhesive caused by it flowing to both sides of the kraft paper when the width of the kraft paper changes. On the other hand, it also avoids the change in adhesive content per unit area caused by the adhesive roller not changing the length of the adhesive coverage after the adhesive is adjusted according to the width of the kraft paper, which would affect the forming quality of the high-viscosity film.

[0034] As a possible implementation of this solution, preferably, the protective film guiding assembly 34 includes a second bidirectional lead screw 341 that is laterally rotatably disposed above the glue roller 31 of the coating box 1, and a pair of guide plates 342 symmetrically sleeved at both ends of the second bidirectional lead screw 341 and threadedly connected to the second bidirectional lead screw 341; the glue roller 31 passes through the lower part of the guide plate 342, and the guide plate 342 slides along the length direction of the glue roller 31; the first bidirectional lead screw 321 and the second bidirectional lead screw 341 have opposite thread directions; the rotation of the second bidirectional lead screw 341 can drive the two guide plates 342 to move along the length direction of the second bidirectional lead screw 341, so that the kraft paper is located between the two guide plates 342, which can limit the kraft paper and prevent it from shifting during the glue application process.

[0035] As a possible implementation of this solution, preferably, the movement control component 35 includes a first gear 351 rotatably disposed on the outer wall of the coating box 1 and fixedly sleeved outside the first bidirectional lead screw 321; a second gear 352 rotatably disposed on the outer wall of the coating box 1 with its shaft end passing through the side wall of the coating box 1 and fixedly connected to the shaft end of the second bidirectional lead screw 341; a mounting bracket 353 fixed to the outer wall of the coating box 1 and covering the second gear 352; and a second gear 352 fixed to the outer wall of the mounting bracket 353 with its drive end passing through the mounting bracket 353 and fixed to the shaft end of the second gear 352. Two motors 354; the first gear 351 and the second gear 352 mesh with each other; through the meshing of the first gear 351 and the second gear 352, the first bidirectional lead screw 321 and the second bidirectional lead screw 341 with opposite thread directions can be driven to rotate synchronously, thereby realizing the synchronous movement of the push plate 322 and the guide plate 342 on the corresponding side. On the one hand, it can ensure that the push plate 322 and the guide plate 342 on the corresponding side are on the same plane, thereby improving the control accuracy of the glue dispersion area. On the other hand, it reduces one drive motor, which can save resources and reduce costs.

[0036] As a possible implementation of this solution, preferably, the liquid inlet assembly 33 includes a liquid storage tank 331 fixed to one side of the coating box 1, a connecting pipe 332 for connecting the liquid storage tank 331 to the inside of the coating roller, a spray head 333 fixed to the liquid outlet end of the connecting pipe 332, and a liquid pump 334 connected to the connecting pipe 332 and located outside the coating box 1; the liquid outlet end of the connecting pipe 332 passes through the first bidirectional lead screw 321 from the end of the first bidirectional lead screw 321, and then from the... A bidirectional lead screw 321 passes through the middle of the first bidirectional lead screw 321 and extends into the interior of the coating roller 31; the connecting pipe 332 is composed of several tubes connected end to end, and adjacent tubes are rotatably connected. The connecting pipe 332 passes through the middle of the first bidirectional lead screw 321 into the interior of the coating roller 31, so that when the glue is sprayed into the coating roller 31, it is between the two push plates 322, thereby ensuring that the glue is between the two push plates 322 so that the two push plates 322 can control the glue dispersion area.

[0037] As a possible implementation of this solution, preferably, the connecting pipe 332 is provided with a one-way valve 335 inside one end of the glue roller 31 to control the one-way flow of liquid from the connecting pipe 332 into the glue roller 31; by setting the one-way valve 335, the glue in the application roller 31 will not flow back into the connecting pipe 332, thereby avoiding contamination of the glue in the connecting pipe 332 as much as possible.

[0038] As a possible implementation of this solution, preferably, the tensioning guide mechanism 2 includes a linear driver 21 vertically installed in the coating box 1 and a tensioning roller 22 horizontally installed in the coating box 1 and fixedly connected to the driving end of the linear driver 21; by setting the linear driver 21 and the tensioning roller 22, the kraft paper can be tensioned to ensure that the upper surface of the kraft paper is in contact with the coating roller 31, so as to realize the feeding of the kraft paper.

[0039] As a possible implementation of this solution, preferably, the sidewall of the glue roller 31 is provided with a plurality of horizontally arranged discharge channels 311, and a liquid guiding strip 312 for guiding the glue is fixed inside the glue roller 31 between two adjacent discharge channels 311; the height of the liquid guiding strip 312 gradually decreases from the middle to both sides; the liquid guiding strip 312 can guide the glue located between the two discharge channels 311 inside the paint roller 31, and prevent the glue from accumulating between the two discharge channels 311 inside the paint roller 31.

[0040] The working principle of this device is as follows:

[0041] The first step is to feed the kraft paper into the coating box 1 through the feed inlet 11, pass under the tensioning guide mechanism 2 located at the feed inlet 11, under the glue roller 31, and above the tensioning guide mechanism 2 located at the discharge outlet 12, and then pass out through the discharge outlet 12.

[0042] The second step is to turn on the second motor 354, so that the first gear 351 drives the first bidirectional lead screw 321 to rotate, and the second gear 352 drives the second bidirectional lead screw 341 to rotate simultaneously, so that the two guide plates 342 move toward each other and the two push plates 322 move toward each other simultaneously until the two guide plates 3421 respectively come into contact with the kraft paper, and then turn off the second motor 354.

[0043] The third step is to turn on the liquid pump 334, so that the glue in the storage tank 331 is sprayed into the glue roller 31 through the connecting pipe 332 and the spray head 333. Then, it flows from the glue roller 31 into the kraft paper through the discharge channel 311. Then, the glue roller 31 is rotated to spread the glue on the kraft paper.

[0044] The above description is only a specific embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural transformations made based on the contents of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A coating apparatus for kraft paper protective film, characterized in that: It includes a coating box (1), a pair of tensioning guide mechanisms (2) centrally symmetrically arranged in the coating box (1), and a coating mechanism (3) arranged between the two tensioning guide mechanisms (2) in the coating box (1); The coating box (1) has a feed inlet (11) on one side and a discharge outlet (12) on the other side. The coating mechanism (3) includes a glue roller (31) that is laterally rotated inside the coating box (1), a glue control component (32) that is located inside the glue roller (31) and is used to limit the glue dispersion area, a liquid inlet component (33) that is located on one side of the coating box (1) and extends through the glue control component (32) and into the glue roller (31), a pair of protective film guide components (34) that are symmetrically sleeved outside the glue roller (31) and are used to guide the protective film, a movement control component (35) that is located outside the coating box (1) and is used to drive the glue control component (32) and the protective film guide component (34) to move, and a first motor (36) that is fixed to the outer side wall of the coating box (1) and whose drive end passes through the side wall and is fixedly connected to the shaft end of the glue roller (31). The glue control assembly (32) includes a first bidirectional lead screw (321) that is laterally rotatably disposed inside the glue roller (31) and one end of which passes through the movable end of the glue roller (31) and the side wall of the coating box (1) and extends to the outside of the coating box (1); a pair of push plates (322) symmetrically sleeved at both ends of the first bidirectional lead screw (321) and threadedly connected to the first bidirectional lead screw (321); and a pair of telescopic rods (323) symmetrically fixed between the two push plates (322). The outer wall of the push plate (322) abuts against the inner wall of the glue roller (31).

2. The coating apparatus for kraft paper protective film according to claim 1, characterized in that: The protective film guiding assembly (34) includes a second bidirectional lead screw (341) that is laterally rotatably disposed above the glue roller (31) of the coating box (1) and a pair of guide plates (342) symmetrically sleeved at both ends of the second bidirectional lead screw (341) and threadedly connected to the second bidirectional lead screw (341); the glue roller (31) passes through the lower part of the guide plate (342) and the guide plate (342) slides along the length direction of the glue roller (31); the first bidirectional lead screw (321) and the second bidirectional lead screw (341) have opposite thread directions.

3. The coating apparatus for kraft paper protective film according to claim 1, characterized in that: The motion control assembly (35) includes a first gear (351) rotatably disposed on the outer wall of the coating box (1) and fixedly sleeved outside the first bidirectional lead screw (321); a second gear (352) rotatably disposed on the outer wall of the coating box (1) and whose shaft end passes through the side wall of the coating box (1) and is fixedly connected to the shaft end of the second bidirectional lead screw (341); a mounting bracket (353) fixed to the outer wall of the coating box (1) and covering the second gear (352); and a second motor (354) fixed to the outer wall of the mounting bracket (353) and whose drive end passes through the mounting bracket (353) and is fixed to the shaft end of the second gear (352); the first gear (351) and the second gear (352) mesh with each other.

4. The coating apparatus for kraft paper protective film according to claim 1, characterized in that: The liquid inlet assembly (33) includes a liquid storage tank (331) fixed on one side of the coating box (1), a connecting pipe (332) for connecting the liquid storage tank (331) and the inside of the coating roller, a spray head (333) fixed at the liquid outlet end of the connecting pipe (332), and a liquid pump (334) connected to the connecting pipe (332) and located outside the coating box (1); the liquid outlet end of the connecting pipe (332) passes through the first bidirectional lead screw (321) from the end of the first bidirectional lead screw (321), and then passes through the middle of the first bidirectional lead screw (321) and extends into the inside of the coating roller.

5. The coating apparatus for kraft paper protective film according to claim 4, characterized in that: The connecting pipe (332) is located inside the glue roller (31) and has a one-way valve (335) inside it to control the flow of liquid from the connecting pipe (332) into the glue roller (31).

6. The coating apparatus for kraft paper protective film according to claim 1, characterized in that: The tensioning guide mechanism (2) includes a linear driver (21) vertically installed in the coating box (1) and a tensioning roller (22) horizontally installed in the coating box (1) and fixedly connected to the driving end of the linear driver (21).

7. The coating apparatus for kraft paper protective film according to claim 1, characterized in that: The glue roller (31) has several horizontally arranged discharge channels (311) around its side wall. Inside the glue roller (31), between two adjacent discharge channels (311), there is a liquid guide strip (312) for guiding the glue. The height of the liquid guide strip (312) gradually decreases from the middle to both sides.

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