A packaging bag processing composite film pressing and feeding device

By designing a highly adaptable composite film pressing and feeding device for packaging bag processing, the problems of poor equipment adaptability and frequent downtime were solved, achieving efficient and continuous production and tight bonding of film materials, thus reducing the defect rate.

CN224335219UActive Publication Date: 2026-06-09ANHUI TONGCHENG SANFU PACKAGING CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ANHUI TONGCHENG SANFU PACKAGING CO LTD
Filing Date
2025-04-01
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing packaging bag processing equipment has poor adaptability, requires multiple sets of equipment, increases costs and space occupation, has low production efficiency, frequently stops when materials are exhausted, and is prone to relative displacement when the base film and composite film are combined, resulting in a high defect rate.

Method used

A composite film pressing and feeding device for packaging bag processing was designed, comprising an adjustable feeding component, a straightening component, and an extrusion bonding component. It can adapt to base films and composite films of different sizes, reduce downtime, and ensure that the film materials are tightly bonded by the straightening and bonding components to avoid relative displacement.

Benefits of technology

It improves production efficiency, reduces equipment downtime, ensures membrane flatness, reduces defect rate, and meets the needs of efficient continuous production.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224335219U_ABST
Patent Text Reader

Abstract

This utility model discloses a composite film pressing and feeding device for packaging bag processing, belonging to the field of packaging bag processing technology. It includes an installation assembly, on which an adjustable feeding component for adapting to different material rollers is mounted. A first drive electric roller is also mounted on the installation assembly, as are two sets of straightening components symmetrically arranged vertically. Through this method, this utility model adjusts the size of the packaging bag base film and composite film to suit different sizes via the adjustable component. The feeding component allows for pre-feeding of the packaging bag base film and composite film, reducing equipment downtime. After the straightening components straighten the packaging bag base film and composite film, the extrusion bonding component bonds them together, preventing easy relative displacement and facilitating subsequent pressing and bonding processes.
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Description

Technical Field

[0001] This utility model relates to the field of packaging bag processing technology, specifically to a packaging bag processing composite film pressing and feeding device. Background Technology

[0002] In today's packaging industry, composite film processing technology for packaging bags is constantly developing and innovating. This technology is widely used in many fields such as food, daily chemicals, and pharmaceuticals, providing products with protection, preservation, and aesthetic display functions. Typically, packaging bags consist of a base film plus a composite film. By adjusting the material, number of layers, and combination method, the base film and composite film can be easily adapted to various industries to achieve different effects.

[0003] When faced with packaging materials of various sizes and specifications, the existing equipment has poor adaptability and requires multiple sets of equipment of different specifications. This not only increases the equipment purchase cost, but also occupies a lot of production space, is cumbersome to operate, and reduces production efficiency.

[0004] Furthermore, in actual production, existing equipment requires shutdown once materials are depleted, leading to a significant increase in downtime. Frequent production interruptions severely impact overall production efficiency, slowing down progress and failing to meet the demands of efficient, continuous production. Simultaneously, most existing devices cannot straighten the base film and composite film, resulting in poor surface smoothness and a tendency for wrinkles and curling. Additionally, relative displacement between the base film and composite film during transport creates potential problems for subsequent lamination, increasing the defect rate, wasting raw materials and production costs, and compromising the sealing and barrier properties of the final packaged products.

[0005] Based on this, this utility model designs a composite film pressing and feeding device for packaging bag processing to solve the above problems. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a packaging bag processing composite film pressing and feeding device.

[0007] The technical solution adopted to solve the above technical problems is:

[0008] A packaging bag processing composite film pressing and feeding device includes an installation assembly. The installation assembly is equipped with an adjustable feeding assembly for adapting to different material rollers. The installation assembly is also equipped with a first drive electric roller and a straightening assembly. Two sets of straightening assemblies are symmetrically arranged vertically. The upper straightening assembly is used to straighten and smooth the packaging bag base film, and the lower straightening assembly is used to straighten and smooth the composite film. The installation assembly is also equipped with a compression bonding assembly for pressing and venting the packaging bag base film and the composite film to ensure a tight bond between them. Finally, the installation assembly is equipped with a third drive electric roller for transporting the double-layer film after the packaging bag base film and the composite film are bonded together.

[0009] The adjustable feeding assembly includes an adjustment component and a feeding component. The adjustment component is connected to the installation component. Two sets of feeding components are arranged in a front-to-back configuration. The feeding component is connected to the adjustment component, the packaging bag base film, and the composite film.

[0010] The above technical solution allows for the adjustment of the appropriate size of packaging bag base film and composite film to accommodate different sizes by adjusting the components. The feeding component can pre-feed the packaging bag base film and composite film to reduce equipment downtime. After the straightening component straightens the packaging bag base film and composite film, the extrusion bonding component bonds the packaging bag base film and composite film together to prevent relative displacement and facilitate subsequent pressing.

[0011] Furthermore, the mounting assembly includes a mounting base plate, a first mounting bracket, a second mounting bracket, and a third mounting bracket. The first mounting bracket, the second mounting bracket, and the third mounting bracket are fixedly mounted on the upper surface of the mounting base plate, and are arranged from left to right as the third mounting bracket, the second mounting bracket, and the first mounting bracket. The first drive electric roller is arranged in two sets, both of which are rotatably mounted on the inner side wall of the first mounting bracket.

[0012] Furthermore, the adjustment assembly includes a linear slide rail, a slider, a bidirectional threaded rod, a mounting component, a worm gear, a worm, and a turntable. The linear slide rail is fixedly mounted on the upper surface of the mounting base plate. Two sets of sliders are arranged in a front-to-back configuration, each slidably connected to the linear slide rail. The bidirectional threaded rod is rotatably mounted on a mounting lug on the right side of the mounting base plate. The left ends of both sets of sliders are threadedly connected to the bidirectional threaded rod, and the two sets of sliders are respectively located at different thread positions on the bidirectional threaded rod. The rear side of the mounting component is fixedly connected to the front side of the mounting base plate. The worm gear is fixedly mounted on the outer wall of the front end of the bidirectional threaded rod. The worm is rotatably mounted on the inner end of the mounting component, and the worm meshes with the worm gear. The lower end face of the turntable is fixedly connected to the upper end face of the worm.

[0013] The above technical solution uses a turntable to drive a worm gear, which in turn drives a worm wheel. The worm wheel then drives a bidirectional threaded rod to rotate, which in turn drives two sets of sliders to slide on a linear slide rail to achieve adjustment.

[0014] Furthermore, the feeding assembly includes a mounting plate, a locking block, and an auxiliary locking block. The lower ends of the two sets of mounting plates are fixedly connected to the upper ends of the two sets of sliders, respectively. The locking blocks and auxiliary locking blocks are arranged in two sets, one above the other, and from top to bottom, they are the upper auxiliary locking block, the upper locking block, the lower auxiliary locking block, and the lower locking block. The left sides of the locking blocks and auxiliary locking blocks are fixedly connected to the right sides of the mounting plate. The two sets of locking blocks at the top are used to engage with the base film of the packaging bag, and the two sets of locking blocks at the bottom are used to engage with the composite film.

[0015] Furthermore, the card block has the same structure as the auxiliary card block.

[0016] With the above technical solution, during normal use, the upper two sets of card blocks carry the base film of the packaging bag, and the lower two sets of card blocks carry the composite film. When the base film of the packaging bag is almost used up, it is transferred to the upper two sets of auxiliary card blocks, and a new base film is placed on the upper card blocks. When the composite film is almost used up, it is transferred to the lower two sets of auxiliary card blocks, and a new composite film is placed on the lower card blocks. This achieves pre-loading, reduces downtime, and improves production efficiency.

[0017] Furthermore, the straightening assembly includes a first follower roller, a first connecting frame, a first slide rod, a first spring, and a connecting plate. The first follower roller is rotatably mounted on the inner end of the first connecting frame. Two sets of the first slide rod and the first spring are arranged in a front-to-back configuration. The bottom surface of the first slide rod is fixedly connected to the upper end surface of the first connecting frame, and the first slide rod is slidably connected to the connecting plate. The two sets of first springs are respectively sleeved on the two sets of first slide rods. The bottom end of the first spring is fixedly connected to the upper end surface of the first connecting frame, and the upper end of the first spring is fixedly connected to the lower end surface of the connecting plate. The connecting plate is fixedly mounted on the inner side wall of the second mounting frame.

[0018] Through the above technical solution, the first connecting frame at the upper end is driven by the first spring at the upper end, and the first connecting frame at the upper end drives the first follower roller at the upper end to smooth and straighten the packaging bag base film. The first slide rod at the upper end guides the first follower roller at the upper end. The first connecting frame at the lower end is driven by the first spring at the lower end, and the first connecting frame at the lower end drives the first follower roller at the lower end to smooth and straighten the composite film. The first slide rod at the lower end guides the first follower roller at the lower end, which facilitates the extrusion bonding assembly to bond the packaging bag base film and the composite film.

[0019] Furthermore, the extrusion bonding assembly includes a fourth mounting frame, a second follower roller, a second slide rod, a second spring, a second drive electric roller, and a second connecting frame. The fourth mounting frame is fixedly mounted on the upper end surface of the mounting base plate and located between the second mounting frame and the third mounting frame. The second drive electric roller is rotatably mounted on the inner end of the fourth mounting frame, and the second follower roller is rotatably mounted on the inner end of the second connecting frame. Two sets of the second slide rod and the second spring are arranged in a front-to-back arrangement. The upper end of the second slide rod is slidably connected to the fourth mounting frame, and the lower end surface of the second slide rod is fixedly connected to the upper end surface of the second connecting frame. The two sets of second springs are respectively sleeved on the two sets of second slide rods. The lower end of the second spring is fixedly connected to the upper end surface of the second connecting frame, and the upper end of the second spring is fixedly connected to the inner top surface of the fourth mounting frame.

[0020] Through the above technical solution, the second connecting frame is driven by the second spring, and the second connecting frame drives the second follower roller to cooperate with the second drive electric roller to bond the packaging bag base film and the composite film. The second slide rod guides the second connecting frame during its movement.

[0021] The beneficial effects of this utility model are as follows: (1) The appropriate size can be adjusted by adjusting the component to adapt to packaging bag base film and composite film of different sizes, and the feeding component can pre-feed the packaging bag base film and composite film to reduce the downtime of the equipment; (2) The packaging bag base film and composite film are stretched by the straightening component and then the packaging bag base film and composite film are bonded by the extrusion bonding component so that the two will not easily shift relative to each other, which facilitates the subsequent pressing process. Attached Figure Description

[0022] Figure 1 This utility model relates to a three-dimensional composite film pressing and feeding device for packaging bag processing. Figure 1 ;

[0023] Figure 2 This is a front view of a composite film pressing and feeding device for packaging bag processing according to the present invention;

[0024] Figure 3 This utility model relates to a three-dimensional composite film pressing and feeding device for packaging bag processing. Figure 2 ;

[0025] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0026] Figure label:

[0027] 1. Mounting assembly; 11. Mounting base plate; 12. First mounting bracket; 13. Second mounting bracket; 14. Third mounting bracket; 2. Adjustable feeding assembly; 21. Adjustment assembly; 211. Linear slide rail; 212. Slider; 213. Bidirectional threaded rod; 214. Mounting component; 215. Worm gear; 216. Worm; 217. Turntable; 22. Feeding assembly; 221. Mounting plate; 222. Locking block; 223. Auxiliary locking block; 3. First drive electric roller; 4. Straightening assembly; 41. First follower roller; 42. First connecting frame; 43. First slide bar; 44. First spring; 45. Connecting plate; 5. Extrusion bonding assembly; 51. Fourth mounting bracket; 52. Second follower roller; 53. Second slide bar; 54. Second spring; 55. Second drive electric roller; 56. Second connecting frame; 6. Third drive electric roller; 7. Packaging bag base film; 8. Composite film. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0030] Example 1: In some embodiments, please refer to the accompanying drawings. Figures 1-4 A packaging bag processing composite film pressing and feeding device includes an installation component 1, an adjustable feeding component 2 for adapting to different material rollers, a first drive electric roller 3, a straightening component 4, two sets of straightening components 4 symmetrically arranged vertically, the upper straightening component 4 for straightening and smoothing the packaging bag base film 7, and the lower straightening component 4 for straightening and smoothing the composite film 8, an extrusion bonding component 5 for pressing and venting the packaging bag base film 7 and the composite film 8 to make them tightly bonded, and a third drive electric roller 6 for transporting the double-layer film after the packaging bag base film 7 and the composite film 8 are bonded together.

[0031] Mounting assembly 1 includes mounting base plate 11, first mounting bracket 12, second mounting bracket 13 and third mounting bracket 14. The first mounting bracket 12, second mounting bracket 13 and third mounting bracket 14 are fixedly mounted on the upper end surface of mounting base plate 11, and are arranged from left to right as third mounting bracket 14, second mounting bracket 13 and first mounting bracket 12. The first drive electric roller 3 is arranged vertically in two sets and is rotatably mounted on the inner side wall of the first mounting bracket 12.

[0032] The adjustable feeding assembly 2 includes an adjusting assembly 21 and a feeding assembly 22. The adjusting assembly 21 is connected to the mounting assembly 1. Two sets of feeding assemblies 22 are arranged in front and behind. The feeding assembly 22 is connected to the adjusting assembly 21, the packaging bag base film 7, and the composite film 8.

[0033] The adjustment assembly 21 includes a linear slide rail 211, a slider 212, a bidirectional threaded rod 213, a mounting component 214, a worm gear 215, a worm 216, and a turntable 217. The linear slide rail 211 is fixedly mounted on the upper surface of the mounting base plate 11. Two sets of sliders 212 are arranged in a front-to-back configuration and are slidably connected to the linear slide rail 211. The bidirectional threaded rod 213 is rotatably mounted on the mounting lug on the right side of the mounting base plate 11. The left ends of both sets of sliders 212 are threadedly connected to the bidirectional threaded rod 213, and the two sets of sliders 212 are respectively located at different thread positions on the bidirectional threaded rod 213. The rear side of the mounting component 214 is fixedly connected to the front side of the mounting base plate 11. The worm gear 215 is fixedly mounted on the outer wall of the front end of the bidirectional threaded rod 213. The worm 216 is rotatably mounted on the inner end of the mounting component 214 and meshes with the worm gear 215. The lower surface of the turntable 217 is fixedly connected to the upper surface of the worm 216.

[0034] The feeding assembly 22 includes a mounting plate 221, a locking block 222, and an auxiliary locking block 223. The lower end faces of the two sets of mounting plates 221 are fixedly connected to the upper end faces of the two sets of sliders 212, respectively. The locking blocks 222 and the auxiliary locking blocks 223 are arranged in two sets, one above the other, from top to bottom: upper auxiliary locking block 223, upper locking block 222, lower auxiliary locking block 223, and lower locking block 222. The left side faces of the locking blocks 222 and the auxiliary locking blocks 223 are fixedly connected to the right side face of the mounting plate 221. The two sets of locking blocks 222 at the top are used to engage with the packaging bag base film 7, and the two sets of locking blocks 222 at the bottom are used to engage with the composite film 8.

[0035] Card block 222 and auxiliary card block 223 have the same structure.

[0036] The straightening assembly 4 includes a first follower roller 41, a first connecting frame 42, a first slide rod 43, a first spring 44, and a connecting plate 45. The first follower roller 41 is rotatably mounted on the inner end of the first connecting frame 42. Two sets of the first slide rod 43 and the first spring 44 are arranged in a front-to-back arrangement. The bottom surface of the first slide rod 43 is fixedly connected to the upper end surface of the first connecting frame 42. The first slide rod 43 is slidably connected to the connecting plate 45. The two sets of first springs 44 are respectively sleeved on the two sets of first slide rods 43. The bottom end of the first spring 44 is fixedly connected to the upper end surface of the first connecting frame 42. The upper end of the first spring 44 is fixedly connected to the lower end surface of the connecting plate 45. The connecting plate 45 is fixedly mounted on the inner side wall of the second mounting frame 13.

[0037] The extrusion bonding assembly 5 includes a fourth mounting frame 51, a second follower roller 52, a second slide rod 53, a second spring 54, a second drive electric roller 55, and a second connecting frame 56. The fourth mounting frame 51 is fixedly mounted on the upper end face of the mounting base plate 11 and is located between the second mounting frame 13 and the third mounting frame 14. The second drive electric roller 55 is rotatably mounted on the inner end of the fourth mounting frame 51. The second follower roller 52 is rotatably mounted on the inner end of the second connecting frame 56. Two sets of second slide rods 53 and second springs 54 are arranged in a front-to-back arrangement. The upper end of the second slide rod 53 is slidably connected to the fourth mounting frame 51, and the lower end face of the second slide rod 53 is fixedly connected to the upper end face of the second connecting frame 56. The two sets of second springs 54 are respectively sleeved on the two sets of second slide rods 53. The lower end of the second spring 54 is fixedly connected to the upper end face of the second connecting frame 56, and the upper end of the second spring 54 is fixedly connected to the inner top surface of the fourth mounting frame 51.

[0038] In use, the turntable 217 drives the worm gear 216, which in turn drives the worm wheel 215. The worm wheel 215 drives the bidirectional threaded rod 213 to rotate, driving two sets of sliders 212 to slide on the linear slide rail 211 to adjust the size to the current suitable size. During normal operation, the packaging bag base film 7 is supported by the two sets of clamping blocks 222 at the upper end. The packaging bag base film 7 then passes over the upper end of the first drive electric roller 3 and is supported by the two sets of clamping blocks 222 at the lower end. The composite film 8 then passes over the lower end of the first drive electric roller 3. When the packaging bag base film 7 is almost used up, it is transferred to the two sets of auxiliary clamping blocks 223 at the upper end, and a new packaging bag base film 7 is placed on the upper clamping blocks 222. When the composite film 8 is almost used up, it is transferred to the two sets of auxiliary clamping blocks 223 at the lower end, and a new composite film 8 is placed on the lower clamping blocks 222, thus achieving pre-loading.

[0039] Then, the packaging bag base film 7 is transported by the upper first drive electric roller 3, and the composite film 8 is transported by the lower first drive electric roller 3. Then, the upper first connecting frame 42 is driven by the upper first spring 44. The upper first connecting frame 42 drives the upper first follower roller 41 to smooth and straighten the packaging bag base film 7. The upper first slide bar 43 guides the upper first follower roller 41. The lower first connecting frame 42 is driven by the lower first spring 44. The lower first connecting frame 42 drives the lower first follower roller 41 to smooth and straighten the composite film 8. The lower first slide bar 43 guides the lower first follower roller 41. Then, the second connecting frame 56 is driven by the second spring 54. The second connecting frame 56 drives the second follower roller 52 to cooperate with the second drive electric roller 55 to bond the packaging bag base film 7 and the composite film 8. The second slide bar 53 guides the second connecting frame 56 during its movement. After bonding, the combined body is transported to the next process by the third drive electric roller 6.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. The above description is merely an embodiment of the present utility model and is not intended to limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A composite film pressing and feeding device for packaging bag processing, comprising an installation assembly (1), characterized in that: The mounting assembly (1) is equipped with an adjustable feeding assembly (2) for adapting to different material rollers. The mounting assembly (1) is equipped with a first drive electric roller (3). The mounting assembly (1) is equipped with a straightening assembly (4). The straightening assembly (4) is symmetrically arranged in two sets. The upper straightening assembly (4) is used to straighten and smooth the packaging bag base film (7). The lower straightening assembly (4) is used to straighten and smooth the composite film (8). The mounting assembly (1) is equipped with a compression bonding assembly (5) for pressing and venting the packaging bag base film (7) and the composite film (8) to make them tightly bonded. The mounting assembly (1) is equipped with a third drive electric roller (6) for transporting the double-layer film after the packaging bag base film (7) and the composite film (8) are bonded together. The adjustable feeding component (2) includes an adjustment component (21) and a feeding component (22). The adjustment component (21) is connected to the installation component (1). Two sets of feeding components (22) are arranged in front and behind. The feeding component (22) is connected to the adjustment component (21), the packaging bag base film (7), and the composite film (8).

2. The packaging bag processing composite film pressing and feeding device according to claim 1, characterized in that, The mounting assembly (1) includes a mounting base plate (11), a first mounting bracket (12), a second mounting bracket (13), and a third mounting bracket (14). The first mounting bracket (12), the second mounting bracket (13), and the third mounting bracket (14) are fixedly mounted on the upper surface of the mounting base plate (11), and are arranged from left to right as the third mounting bracket (14), the second mounting bracket (13), and the first mounting bracket (12). The first drive electric roller (3) is arranged in two sets, both of which are rotatably mounted on the inner side wall of the first mounting bracket (12).

3. The packaging bag processing composite film pressing and feeding device according to claim 2, characterized in that, The adjustment assembly (21) includes a linear slide rail (211), a slider (212), a bidirectional threaded rod (213), a mounting component (214), a worm gear (215), a worm (216), and a turntable (217). The linear slide rail (211) is fixedly mounted on the upper surface of the mounting base plate (11). Two sets of sliders (212) are arranged in a front-to-back configuration, both of which are slidably connected to the linear slide rail (211). The bidirectional threaded rod (213) is rotatably mounted on the mounting lug on the right side of the mounting base plate (11). The left ends of both sets of sliders (212) are connected to the linear slide rail (211). The bidirectional threaded rod (213) is threaded and the two sets of sliders (212) are respectively located at different thread positions on the bidirectional threaded rod (213). The rear side of the mounting part (214) is fixedly connected to the front side of the mounting base plate (11). The worm wheel (215) is fixedly installed on the outer side wall of the front end of the bidirectional threaded rod (213). The worm (216) is rotatably installed on the inner end of the mounting part (214). The worm (216) is meshed with the worm wheel (215). The lower end face of the turntable (217) is fixedly connected to the upper end face of the worm (216).

4. The packaging bag processing composite film pressing and feeding device according to claim 3, characterized in that, The feeding assembly (22) includes a mounting plate (221), a locking block (222), and an auxiliary locking block (223). The lower end faces of the two sets of mounting plates (221) are fixedly connected to the upper end faces of the two sets of sliders (212). The locking blocks (222) and the auxiliary locking blocks (223) are arranged in two sets, one above the other. From top to bottom, they are the upper auxiliary locking block (223), the upper locking block (222), the lower auxiliary locking block (223), and the lower locking block (222). The left side faces of the locking blocks (222) and the auxiliary locking blocks (223) are fixedly connected to the right side face of the mounting plate (221). The two sets of upper locking blocks (222) are used to engage with the base film (7) of the packaging bag, and the two sets of lower locking blocks (222) are used to engage with the composite film (8).

5. The packaging bag processing composite film pressing and feeding device according to claim 4, characterized in that, The card block (222) has the same structure as the auxiliary card block (223).

6. The packaging bag processing composite film pressing and feeding device according to claim 2, characterized in that, The straightening assembly (4) includes a first follower roller (41), a first connecting frame (42), a first slide rod (43), a first spring (44), and a connecting plate (45). The first follower roller (41) is rotatably mounted on the inner end of the first connecting frame (42). The first slide rod (43) and the first spring (44) are arranged in two sets. The bottom surface of the first slide rod (43) is fixedly connected to the upper end surface of the first connecting frame (42). The first slide rod (43) is limited and slidably connected to the connecting plate (45). The two sets of first springs (44) are respectively sleeved on the two sets of first slide rods (43). The bottom end of the first spring (44) is fixedly connected to the upper end surface of the first connecting frame (42). The upper end of the first spring (44) is fixedly connected to the lower end surface of the connecting plate (45). The connecting plate (45) is fixedly mounted on the inner side wall of the second mounting frame (13).

7. The packaging bag processing composite film pressing and feeding device according to claim 6, characterized in that, The extrusion bonding assembly (5) includes a fourth mounting bracket (51), a second follower roller (52), a second slide bar (53), a second spring (54), a second drive electric roller (55), and a second connecting bracket (56). The fourth mounting bracket (51) is fixedly mounted on the upper end face of the mounting base plate (11) and located between the second mounting bracket (13) and the third mounting bracket (14). The second drive electric roller (55) is rotatably mounted on the inner end of the fourth mounting bracket (51), and the second follower roller (52) is rotatably mounted on the second connecting bracket (56). At the inner end, two sets of the second slide rod (53) and the second spring (54) are arranged in a front-to-back arrangement. The upper end of the second slide rod (53) is slidably connected to the fourth mounting bracket (51), and the lower end face of the second slide rod (53) is fixedly connected to the upper end face of the second connecting bracket (56). The two sets of second springs (54) are respectively sleeved on the two sets of second slide rods (53). The lower end of the second spring (54) is fixedly connected to the upper end face of the second connecting bracket (56), and the upper end of the second spring (54) is fixedly connected to the inner top surface of the fourth mounting bracket (51).