A printing device for a packaging bag composite film production

Abstract

The utility model discloses a printing device for packaging bag composite film production relates to packaging composite film production equipment technical field, including printing mechanism, and the printing mechanism includes workstation. The utility model discloses through setting replacement mechanism, and replacement mechanism does not need to help special tool, needs to replace gluing cotton, and the synchronous rotation subassembly of operating replacement mechanism is driven bidirectional screw rod rotation, because bidirectional screw rod is connected with connecting plate screw thread, and connecting plate is fixed on fixed plate, and bidirectional screw rod rotation will drive the fixed plate of left and right sides away from each other or close, when fixed plate is far from gluing cotton, can take down old gluing cotton and replace new gluing cotton, and after replacement is completed, reverse operation synchronous rotation subassembly makes fixed plate re clamps gluing cotton, and completes replacement, solved its gluing cotton and gluing box between using fixed connection mode, make operator unable fast conveniently to gluing cotton carries out disassembly, cleaning or replacement problem.

Description

Technical Field

[0001] This utility model relates to the technical field of packaging composite film production equipment, specifically a printing device for producing packaging bag composite films. Background Technology

[0002] Existing packaging bags are generally single-layer film structures, providing only simple barrier functions and failing to meet requirements for light blocking or good formability. Furthermore, these bags have poor stain resistance. Lamination equipment uses adhesives to bond two or more layers of materials together. Examples include films and aluminum foil, films and paper, which are frequently used. It can also be laminated with films, sponges, and fabrics. Most common flexible packaging materials are composite products. Printing is a technology that uses processes such as plate making, inking, and pressing to transfer ink to the surface of materials such as paper, textiles, and leather, mass-producing the content of the original artwork. Printing is required in the production of packaging bags.

[0003] According to the authorized announcement number CN213198846U, a printing device for producing composite film for packaging bags is disclosed, including a support leg and a first hydraulic column. A base is fixed to the upper end of the support leg, and a worktable is fixed to the upper end of the base. A first unwinding roller is distributed on the left side of the base, and a winding roller is distributed on the right side. A support column is fixed to the upper end of the base, and a mounting base is fixed to the upper end of the support column. The first hydraulic column is fixed to the lower end of the mounting base, and a first pressure roller is installed at the lower end of the first hydraulic column. A coating box is distributed on the right side of the first hydraulic column, and coating cotton is installed at the lower end of the coating box. This printing device for producing composite film for packaging bags is equipped with a first hydraulic column, which is perpendicular to the mounting base. When the first unwinding roller rotates, it releases the lower film and moves it onto the worktable. The first hydraulic column allows the user to adjust its length as needed, thereby allowing the first pressure roller to press the lower film onto the worktable.

[0004] Based on the search of the aforementioned patents and the findings of existing equipment, it is found that when the aforementioned equipment is used, the glue-coating cotton and the glue-coating box are fixedly connected. During long-term use, the glue-coating cotton is prone to a decrease in glue coating uniformity due to ink residue, adhesive curing, or wear, which in turn affects the printing quality. Furthermore, the fixed connection structure makes it impossible for operators to quickly and easily disassemble, clean, or replace the glue-coating cotton, requiring the use of special tools for disassembly, which prolongs equipment downtime and reduces production efficiency. Utility Model Content

[0005] To address the problems mentioned in the background art, the purpose of this utility model is to provide a printing device for the production of composite film for packaging bags, which has the advantage of convenient replacement of the coating cotton and solves the problem that the fixed connection between the coating cotton and the coating box makes it impossible for operators to quickly and conveniently disassemble, clean or replace the coating cotton.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a printing device for producing composite film for packaging bags, comprising a printing mechanism, the printing mechanism including a worktable, a first electric telescopic rod fixedly installed at each of the four corners of the top of the worktable, an installation plate fixedly installed at the output end of the first electric telescopic rod, an upper film unwinding roller fixedly installed at the middle position of the bottom of the installation plate, a lower mold unwinding roller fixedly installed on the left side of the top of the worktable, a motor-driven take-up roller fixedly installed on the right side of the top of the worktable, flattening rollers fixedly installed on the left and right sides of the bottom of the installation plate, an adhesive coating box fixedly installed on the left side inside the installation plate, adhesive coating cotton provided at the bottom opening of the adhesive coating box, and a replacement mechanism, the replacement mechanism including a fixed plate, the left and right sides of the fixed plate being provided with adhesive coating cotton, connecting plates fixedly connected to the front and back of the fixed plate, a bidirectional screw threadedly connected to the internal threads of the front connecting plate and the rear connecting plate, a support assembly movably connected to the left and right sides of the surface of the bidirectional screw via bearings, and a synchronous rotation assembly fixedly connected to the left end of the bidirectional screw.

[0007] In a preferred embodiment of this invention, the support assembly includes a support block, which is movably connected to the left and right sides of the bidirectional screw surface via bearings. An mounting block is fixedly connected to the inner side of the support block, and the inner side of the mounting block is fixedly connected to the left and right sides of the glue applicator.

[0008] As a preferred embodiment of this invention, the synchronous rotation assembly includes a synchronous pulley, which is fixedly connected to the left end of the bidirectional screw, and a synchronous belt is drivingly connected to the surfaces of the two synchronous pulleys.

[0009] As a preferred embodiment of this utility model, positioning baffles are fixedly connected to the bottom of both the front and back sides of the glue-applying box, and the glue-applying cotton is located between the two positioning baffles.

[0010] As a preferred embodiment of this invention, the inner side of the fixing plate is fixedly connected with fixing spikes, and multiple fixing spikes are provided and distributed at equal intervals.

[0011] As a preferred embodiment of this invention, a rotating block is fixedly connected to the right end of the bidirectional screw on the front side, and the rotating block is used to rotate the bidirectional screw.

[0012] As a preferred embodiment of this invention, the surface of the rotating block is provided with a torsion groove, and the torsion groove is provided in multiple ways and is distributed in a ring at equal intervals.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model, by setting up a replacement mechanism, eliminates the need for special tools. When the adhesive cotton needs to be replaced, the synchronous rotation component of the replacement mechanism is operated to drive the bidirectional screw to rotate. Since the bidirectional screw is threadedly connected to the connecting plate, and the connecting plate is fixed to the fixed plate, the rotation of the bidirectional screw will drive the left and right fixed plates to move away from or closer to each other. When the fixed plate moves away from the adhesive cotton, the old adhesive cotton can be removed and replaced with new adhesive cotton. After the replacement is completed, the synchronous rotation component is operated in reverse to make the fixed plate clamp the adhesive cotton again, thus completing the replacement. This solves the problem that the fixed connection between the adhesive cotton and the adhesive box makes it difficult for operators to quickly and conveniently disassemble, clean, or replace the adhesive cotton, achieving the effect of convenient adhesive cotton replacement.

[0014] 2. This utility model provides stable support and limit for the bidirectional screw by setting up a support component and cooperating with the support block and the mounting block, preventing the bidirectional screw from shifting axially, ensuring the stability and reliability of the replacement mechanism, avoiding uneven clamping force of the fixing plate due to the deviation of the bidirectional screw, which would affect the installation stability of the adhesive cotton or the convenience of the replacement operation, and further improving the practicality of the replacement mechanism.

[0015] 3. This utility model achieves synchronous rotation of the bidirectional screws on both the front and rear sides by setting a synchronous rotation component, so that the movement of the left and right fixed plates is kept synchronous. This avoids uneven force on the adhesive cotton and installation misalignment caused by asynchronous movement of the two fixed plates, ensuring that the adhesive cotton can be accurately installed at the bottom opening of the adhesive box, ensuring uniform adhesive application. At the same time, it simplifies the operation steps, requiring only the operation of one bidirectional screw to complete the synchronous adjustment of the two fixed plates, thus improving the efficiency of adhesive cotton replacement. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the replacement mechanism of this utility model; Figure 3 This is an exploded structural diagram of the replacement mechanism of this utility model.

[0017] In the diagram: 1. Printing mechanism; 101. Workbench; 102. First electric telescopic rod; 103. Mounting plate; 104. Upper film unwinding roller; 105. Lower mold unwinding roller; 106. Rewinding roller; 107. Flattening roller; 108. Glue box; 109. Glue cotton; 2. Changing mechanism; 21. Fixing plate; 22. Connecting plate; 23. Bidirectional screw; 24. Support assembly; 241. Support block; 242. Mounting block; 25. Synchronous rotation assembly; 251. Synchronous pulley; 252. Synchronous belt; 3. Positioning baffle; 4. Fixing spike; 5. Rotating block; 6. Torsion groove. Detailed Implementation

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0021] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0022] Example 1 Reference Figure 1-3 This is the first embodiment of the present invention, providing a printing device for producing composite film for packaging bags, including a printing mechanism 1. The printing mechanism 1 includes a worktable 101, with first electric telescopic rods 102 fixedly installed at the four corners of the top of the worktable 101. An mounting plate 103 is fixedly installed at the output end of the first electric telescopic rods 102. An upper film unwinding roller 104 is fixedly installed at the center of the bottom of the mounting plate 103. A lower mold unwinding roller 105 is fixedly installed on the left side of the top of the worktable 101, and a motor-driven take-up roller 106 is fixedly installed on the right side of the top of the worktable 101. The left and right sides of the bottom of the mounting plate 103 are also provided. A flattening roller 107 is fixedly installed. An adhesive applicator 108 is fixedly installed on the left side inside the mounting plate 103. An adhesive applicator 109 is provided at the bottom opening of the adhesive applicator 108. A replacement mechanism 2 is also provided. The replacement mechanism 2 includes a fixing plate 21. The fixing plate 21 is provided on the left and right sides of the adhesive applicator 109. A connecting plate 22 is fixedly connected to the front and back of the fixing plate 21. A bidirectional screw 23 is threadedly connected to the front connecting plate 22 and the rear connecting plate 22. A support assembly 24 is movably connected to the left and right sides of the surface of the bidirectional screw 23 through bearings. A synchronous rotation assembly 25 is fixedly connected to the left end of the bidirectional screw 23.

[0023] Specifically, by setting up a replacement mechanism 2, the replacement mechanism 2 can quickly disassemble and install the adhesive cotton 109 without the need for special tools, through the cooperation of the synchronous rotating component 25 and the bidirectional screw 23, shortening equipment downtime, improving production efficiency, and avoiding damage to the adhesive box 108 and other components during disassembly, reducing equipment maintenance costs and production losses, and meeting the needs of large-scale and continuous production.

[0024] Furthermore, when it is necessary to replace the adhesive cotton 109, operate the synchronous rotation component 25 of the replacement mechanism 2 to drive the bidirectional screw 23 to rotate. Since the bidirectional screw 23 is threadedly connected to the connecting plate 22 and the connecting plate 22 is fixed on the fixing plate 21, the rotation of the bidirectional screw 23 will drive the fixing plates 21 on the left and right sides to move away from or closer to each other. When the fixing plate 21 moves away from the adhesive cotton 109, the old adhesive cotton 109 can be removed and replaced with a new adhesive cotton 109. After the replacement is completed, operate the synchronous rotation component 25 in reverse so that the fixing plate 21 clamps the adhesive cotton 109 again, and the replacement is completed.

[0025] Example 2 In the second embodiment of this utility model, the support component 24 includes a support block 241, which is movably connected to the left and right sides of the surface of the bidirectional screw 23 via bearings. An mounting block 242 is fixedly connected to the inner side of the support block 241, and the inner side of the mounting block 242 is fixedly connected to the left and right sides of the glue application box 108.

[0026] Specifically, by setting up the support component 24, the support block 241 and the mounting block 242 cooperate to provide stable support and limit for the bidirectional screw 23, prevent the bidirectional screw 23 from axially shifting, ensure the stability and reliability of the replacement mechanism 2, avoid uneven clamping force of the fixing plate 21 due to the deviation of the bidirectional screw 23, and thus affect the installation stability or replacement operation convenience of the adhesive cotton 109, further improving the practicality of the replacement mechanism 2.

[0027] Furthermore, the support block 241 in the support assembly 24 is movably connected to the bidirectional screw 23 via a bearing, and the mounting block 242 fixes the support block 241 to the glue application box 108. When the bidirectional screw 23 rotates, the support block 241 remains stationary because it is fixed to the glue application box 108. Under the limiting action of the support block 241, the bidirectional screw 23 only rotates, avoiding axial displacement of the bidirectional screw 23 during rotation. This ensures that the bidirectional screw 23 can stably drive the connecting plate 22 to move the fixing plate 21, thereby clamping or loosening the glue application cotton 109.

[0028] Example 3 In the third embodiment of this utility model, the synchronous rotation assembly 25 includes a synchronous pulley 251, which is fixedly connected to the left end of the bidirectional screw 23, and a synchronous belt 252 is connected to the surface of the two synchronous pulleys 251.

[0029] Specifically, by setting up the synchronous rotation component 25, the synchronous rotation of the bidirectional screws 23 on both the front and rear sides is achieved, so that the movement of the left and right fixing plates 21 is kept synchronous. This avoids uneven force on the adhesive cotton 109 and installation misalignment caused by the asynchronous movement of the two fixing plates 21, ensuring that the adhesive cotton 109 can be accurately installed at the bottom opening of the adhesive box 108, ensuring uniform adhesive application. At the same time, the operation steps are simplified, and only one bidirectional screw 23 needs to be operated to complete the synchronous adjustment of the two fixing plates 21, improving the replacement efficiency of the adhesive cotton 109.

[0030] Furthermore, the two synchronous pulleys 251 of the synchronous rotation assembly 25 are respectively fixed to the left end of the bidirectional screws 23 on the front and rear sides. The synchronous belt 252 drives the two synchronous pulleys 251. When one of the bidirectional screws 23 is operated to rotate, the synchronous pulley 251 on the bidirectional screw 23 drives the other synchronous pulley 251 to rotate synchronously through the synchronous belt 252, thereby making the two bidirectional screws 23 rotate in the same direction at the same time, ensuring that the fixed plates 21 on the left and right sides can move away from or towards each other synchronously.

[0031] Working principle: Before starting the device, the upper film substrate is installed on the upper film unwinding roller 104, and the lower film substrate is installed on the lower film unwinding roller. The free ends of the two substrates are then passed sequentially under the flattening roller 107 and under the adhesive cotton 109 at the bottom of the adhesive box 108, and finally fixed to the motor-driven take-up roller 106. At the same time, the height of the mounting plate 103 is adjusted by the first electric telescopic rod 102 to make the flattening roller 107 fit against the surface of the substrate, ensuring that there is no significant slack during the substrate conveying process. Then, the device is started, and the motor-driven take-up roller 106 begins to rotate, generating traction force to pull the lower film substrate from the lower film unwinding roller. Simultaneously, the upper film substrate is released from the upper film unwinding roller 104. The two substrates are conveyed along the surface of the worktable 101 towards the take-up roller 106. During this process, the first electric telescopic rod 102 adjusts the height of the mounting plate 103 to make the flattening roller 107 fit against the surface of the substrate, ensuring that there is no significant slack during the substrate conveying process. The telescopic rod 102 adjusts the height of the mounting plate 103 in real time according to the thickness of the substrate, ensuring that the flattening rollers 107 on both sides always maintain appropriate pressure against the substrate surface. This flattens the upper and lower film substrates during transport, eliminating wrinkles generated during unwinding. This provides a flat substrate surface for subsequent gluing and printing, a hidden function of the device. Based on the core purpose of the printing device, this process avoids uneven gluing or printing pattern misalignment caused by wrinkles. When the flattened lower film substrate is transported to the bottom of the gluing box 108, the adhesive stored inside the gluing box 108 permeates into the gluing cotton 109 through the bottom opening. The gluing cotton 109 contacts the surface of the lower film substrate, and as the substrate is transported, the gluing cotton 109 evenly applies the adhesive to the surface of the lower film substrate. At this time, the machine is changed. In structure 2, the fixing plate 21 strengthens the interlocking force between the fixing plate 21 and the adhesive cotton 109 through the fixing spikes 4 on the inner side, preventing the adhesive cotton 109 from sliding due to substrate friction or adhesive pressure. The positioning baffle 3 limits the adhesive cotton 109 from the front and rear sides, preventing the adhesive cotton 109 from shifting and causing deviation in the adhesive application range, ensuring that the adhesive width matches the substrate requirements, and providing a uniform adhesive surface for subsequent lamination and printing processes of the upper and lower films. The lower film substrate, after adhesive application, continues to be conveyed and laminated with the upper film substrate in subsequent processes to form a composite film substrate. Subsequently, the composite film substrate enters the printing unit, where text, patterns, and other information are transferred to the surface of the composite film through processes such as plate making, inking, and pressure application, completing the printing operation. Throughout this process, the substrate is always pulled by the take-up roller 106. Stable conveying under gravity, the flattening roller 107 maintains a flattened state, ensuring no substrate shift during printing and guaranteeing the clarity and accuracy of the printed pattern. The printed composite film substrate is finally wound into a roll by the motor-driven take-up roller 106, forming a finished roll. When the coated cotton 109 needs replacement due to wear or contamination, the operator applies force through multiple annularly spaced torsion grooves 6 on the surface of the rotating block 5. Rotating the rotating block 5 drives the front bidirectional screw 23 to rotate. Since the two synchronous pulleys 251 in the synchronous rotating assembly 25 are connected by a synchronous belt 252, when the front bidirectional screw 23 rotates, it drives the rear bidirectional screw 23 to rotate synchronously and in the same direction through the synchronous pulleys 251 and the synchronous belt 252.The connecting plate 22, threadedly connected to the bidirectional screw 23, moves the fixing plates 21 on both sides away from each other. The fixing spikes 4 on the inner side of the fixing plates 21 disengage from the surface of the adhesive cotton 109, releasing the clamping fixation on the adhesive cotton 109. The operator removes the old adhesive cotton 109 and places the new adhesive cotton 109 between the positioning baffles 3. After ensuring alignment, the rotating block 5 is rotated in the opposite direction, causing the bidirectional screw 23 to rotate in the opposite direction, bringing the left and right fixing plates 21 closer together and re-clamping the adhesive cotton 109. The fixing spikes 4 then pierce the surface of the adhesive cotton 109 again to complete the fixation. After replacement, the device can be restarted and enter production.

[0032] In summary: By setting up the replacement mechanism 2, which eliminates the need for special tools, when the adhesive cotton 109 needs to be replaced, the synchronous rotation component 25 of the replacement mechanism 2 is operated to drive the bidirectional screw 23 to rotate. Since the bidirectional screw 23 is threadedly connected to the connecting plate 22 and the connecting plate 22 is fixed on the fixing plate 21, the rotation of the bidirectional screw 23 will drive the fixing plates 21 on the left and right sides to move away from or closer to each other. When the fixing plate 21 moves away from the adhesive cotton 109, the old adhesive cotton 109 can be removed and replaced with a new one. After the replacement is completed, the synchronous rotation component 25 is operated in reverse to make the fixing plate 21 clamp the adhesive cotton 109 again, thus completing the replacement. This solves the problem that the fixed connection between the adhesive cotton and the adhesive box makes it difficult for operators to quickly and conveniently disassemble, clean, or replace the adhesive cotton, achieving the effect of convenient adhesive cotton replacement.

[0033] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0034] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0035] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solution 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 solution of this utility model without departing from the spirit and scope of the technical solution 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 printing device for a packaging bag composite film production, characterized by: The system includes a printing mechanism (1), which includes a worktable (101). Four first electric telescopic rods (102) are fixedly installed at the top corners of the worktable (101). An mounting plate (103) is fixedly installed at the output end of each of the first electric telescopic rods (102). An upper film unwinding roller (104) is fixedly installed at the middle position of the bottom of the mounting plate (103). A lower mold unwinding roller (105) is fixedly installed on the left side of the top of the worktable (101). A motor-driven take-up roller (106) is fixedly installed on the right side of the top of the worktable (101). Flattening rollers (107) are fixedly installed on the left and right sides of the bottom of the mounting plate (103). An adhesive applicator (108) is fixedly installed on the left side inside the container. An adhesive applicator (109) is provided at the bottom opening of the adhesive applicator (108). A replacement mechanism (2) is also provided. The replacement mechanism (2) includes a fixing plate (21). The fixing plate (21) is provided on the left and right sides of the adhesive applicator (109). A connecting plate (22) is fixedly connected to the front and back sides of the fixing plate (21). A bidirectional screw (23) is threadedly connected to the front connecting plate (22) and the rear connecting plate (22). A support assembly (24) is movably connected to the left and right sides of the surface of the bidirectional screw (23) through a bearing. A synchronous rotation assembly (25) is fixedly connected to the left end of the bidirectional screw (23).

2. The printing device for producing a packaging bag composite film according to claim 1, characterized by: The support assembly (24) includes a support block (241), which is movably connected to the left and right sides of the surface of the bidirectional screw (23) via bearings. An mounting block (242) is fixedly connected to the inner side of the support block (241), and the inner side of the mounting block (242) is fixedly connected to the left and right sides of the glue box (108).

3. The printing device for producing a packaging bag composite film according to claim 1, characterized in that: The synchronous rotation assembly (25) includes a synchronous pulley (251), which is fixedly connected to the left end of the bidirectional screw (23), and the surfaces of the two synchronous pulleys (251) are connected by a synchronous belt (252).

4. The printing apparatus for producing composite film for packaging bags according to claim 1, characterized in that: The bottom of the front and back sides of the glue-applying box (108) is fixedly connected to positioning baffles (3), and the glue-applying cotton (109) is located between the two positioning baffles (3).

5. The printing apparatus for producing composite film for packaging bags according to claim 1, characterized in that: The inner side of the fixing plate (21) is fixedly connected with fixing spikes (4), and there are multiple fixing spikes (4) that are evenly distributed.

6. The printing apparatus for producing composite film for packaging bags according to claim 1, characterized in that: A rotating block (5) is fixedly connected to the right end of the bidirectional screw (23) on the front side, and the rotating block (5) is used to rotate the bidirectional screw (23).

7. The printing apparatus for producing composite film for packaging bags according to claim 6, characterized in that: The surface of the rotating block (5) is provided with a torsion groove (6), and there are multiple torsion grooves (6) distributed in a ring at equal intervals.

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