Film mold

Abstract

The utility model relates to the field of molds, in particular to a film mold which comprises a mold head and a material injection seat connected to the mold head, the mold head is provided with a cavity, at least two material injection openings are formed in the end face of the mold head at intervals, a plurality of guide runners are formed in the inner walls of the material injection openings at intervals, and feeding openings are formed in the surface, facing the material injection openings, of the material injection seat in a one-to-one correspondence mode. A sizing material sequentially passes through the feeding port and the injection port and enters the cavity from the guide runner, a discharging port is formed in the end face, away from the injection base, of the die head and communicates with the cavity, and the sizing material in the cavity is extruded through the discharging port to form a film. Through the arrangement of the guide runner, sizing materials with two colors are sequentially distributed in the cavity in a staggered mode, the sizing materials in the cavity are extruded out through the discharging port to form zebra-shaped films with the two colors arranged in a staggered mode, the films do not need to be subjected to color printing coloring any more, the film processing steps are reduced, the film processing period is shortened, and the production efficiency is improved. Therefore, the processing cost of the film is reduced.

Description

A thin film mold Technical Field

[0001] This application relates to the field of molds, and more particularly to a thin film mold. Background Technology

[0002] Film molds are an important tool in the production process of plastic products. They are used to form a film by injecting plastic material into the cavity of the mold and extruding it from the outlet.

[0003] However, when it is necessary to produce zebra-shaped films with two colors alternating, the film extruded from the mold needs to be printed with colors, which increases the film processing steps, extends the film processing cycle, and thus increases the film processing cost. Summary of the Invention

[0004] In order to improve the problems of film processing steps, this application provides a film mold.

[0005] This application provides a thin film mold, which adopts the following technical solution:

[0006] A film mold includes a die head and an injection seat connected to the die head. The die head has a cavity for injecting adhesive material. At least two injection ports are spaced apart on the end face of the die head facing the injection seat. Multiple guide channels are spaced apart on the inner wall of each injection port, connecting the cavity and the injection port. The guide channels on at least two of the injection ports are staggered. A feed port is correspondingly provided on the surface of the injection seat facing the injection port, penetrating the surface of the injection seat. Adhesive material passes through the feed port and the injection port sequentially and enters the cavity through the guide channels. An outlet is provided on the end face of the die head away from the injection seat, connecting the cavity. Adhesive material in the cavity is extruded through the outlet to form a film.

[0007] By adopting the above technical solution, when it is necessary to produce a zebra-shaped film with two colors alternating, the user injects the two required colors of adhesive into the two feed ports one by one. The adhesive passes through the feed port and the injection port in sequence and enters the cavity through the guide channel. The guide channels on the two injection ports are staggered, so that the two colors of adhesive are distributed alternately in the cavity. The adhesive in the cavity is extruded through the discharge port to form a zebra-shaped film with two colors alternating. The film does not need to be printed with color, reducing the processing steps of the film, shortening the processing cycle of the film, and thus reducing the processing cost of the film.

[0008] Optionally, the mold head includes at least two modules and at least two fixed seats. The two ends of the length direction of the at least two modules are connected one-to-one to the opposite surfaces of the two fixed seats. The cavity and the discharge port are located on the opposite end faces of the two modules. The injection port corresponds one-to-one with the module. The injection seat is connected between the two modules.

[0009] By adopting the above technical solution, the cavity and the discharge port are located on the opposite end faces of the two modules. When it is necessary to clean the inner wall of the cavity and the inner wall of the discharge port, it is only necessary to disassemble the module, the fixing seat and the injection seat, which facilitates the cleaning of the inner wall of the cavity and the inner wall of the discharge port and improves the ease of use of the film mold.

[0010] Optionally, a fastening assembly is connected between the injection seat and the module. The fastening assembly includes multiple fastening bolts. Multiple fastening holes 1 through which the ends of the fastening bolts pass are spaced apart on the surface of the injection seat. The fastening holes 1 penetrate the outer wall of the injection seat. Each end face of the module facing the fastening hole 1 has a fastening hole 2 for tightening the ends of the fastening bolts. The ends of the fastening bolts pass through the fastening holes 1 and are threaded and fixed to the inner wall of the fastening holes 2 to form a limit.

[0011] By adopting the above technical solution, when the injection seat is placed between two modules, the first fastening hole and the second fastening hole correspond one to one and are connected. The end of the fastening bolt passes through the first fastening hole and is threaded and fixed to the inner wall of the second fastening hole, so as to realize the detachable connection between the injection seat and the module, thereby facilitating the cleaning and replacement of the injection seat.

[0012] Optionally, the fastening assembly includes multiple fastening rings, which are spaced apart and connected to the surface of the injection seat. Each fastening ring corresponds to a fastening hole, and the axis of the fastening ring coincides with the axis of the fastening hole. The inner wall of the fastening ring can abut against the outer circumferential surface of the fastening bolt to form a limit.

[0013] By adopting the above technical solution, the fastening ring and the fastening hole correspond one-to-one, and the axis of the fastening ring and the axis of the fastening hole coincide. When the end of the fastening bolt passes through the fastening hole and is threaded and fixed to the inner wall of the fastening hole, the inner wall of the fastening ring abuts against the outer circumference of the fastening bolt to form a limit, making it difficult for the fastening bolt to deflect in the inner wall of the fastening hole, thereby improving the stability of the fastening bolt in the inner wall of the fastening hole.

[0014] Optionally, the fastening assembly further includes multiple inflation pistons. Each of the surfaces of the injection seat facing the fastening bolt has an inflation channel for the inflation piston to slide. The inflation channel is connected to the inner cavity of the fastening ring bladder. When the end of the fastening bolt passes through the fastening hole and is threaded and fixed to the inner wall of the fastening hole, the end face of the fastening bolt abuts against the end of the inflation piston protruding from the injection seat and drives the inflation piston closer to the inflation channel.

[0015] By adopting the above technical solution, when the end of the fastening bolt passes through the fastening hole and is threaded and fixed to the inner wall of the fastening hole, the end face of the fastening bolt abuts against the end of the inflation piston protruding from the injection seat and drives the inflation piston to approach the inflation channel. The air pressure in the inflation channel increases, the inflation channel connects to the inner cavity of the fastening ring bladder, and the air in the inflation channel enters the inner cavity of the fastening ring bladder. The inner wall of the fastening ring bladder is pressurized and expands and abuts against the outer circumferential surface of the fastening bolt to form a limit, further increasing the fastening force between the inner wall of the fastening ring bladder and the outer circumferential surface of the fastening bolt.

[0016] Optionally, the fastening assembly further includes a plurality of elastic elements, each corresponding to an inflation piston. One end of the elastic element in the direction of elastic force is connected to the bottom wall of the inflation channel, and the other end of the elastic element in the direction of elastic force is connected to the end face of the inflation piston. The elastic element has the elastic force to drive the inflation piston to slide away from the inflation channel, and the end of the inflation piston tends to protrude from the surface of the injection seat.

[0017] By adopting the above technical solution, when the fastening bolt is loosened, the pressure of the fastening bolt on the inflation piston disappears, and the elastic force of the elastic element drives the inflation piston to slide along the inner wall of the inflation channel away from the injection seat. The end of the inflation piston protrudes from the surface of the injection seat, realizing the automatic reset of the inflation piston.

[0018] Optionally, the fastening assembly further includes multiple fastening rings, which are spaced apart and connected to the surface of the injection seat. Each fastening ring corresponds to a fastening hole, and the axis of the fastening ring coincides with the axis of the fastening hole. The inner wall of the fastening ring and the outer peripheral surface of the fastening bolt clamp the two sides of the fastening ring pocket to form a limiting position.

[0019] By adopting the above technical solution, when the end of the fastening bolt passes through the fastening hole and is threaded and fixed to the inner wall of the fastening hole, the inner wall of the fastening ring abuts against the outer circumferential surface of the fastening bolt to form a limit, and the outer wall of the fastening ring abuts against the inner wall of the fastening ring to form a limit, thereby further improving the fastening force between the inner wall of the fastening ring and the outer circumferential surface of the fastening bolt.

[0020] Optionally, the fastening assembly further includes multiple limiting rings, each of which corresponds to a fastening hole. The outer wall of the limiting ring is connected to the inner wall of the fastening hole, and the inner wall of the limiting ring can abut against the outer circumferential surface of the fastening bolt to form a seal.

[0021] By adopting the above technical solution, the outer ring wall of the limiting ring is connected to the inner wall of the fastening hole, and the inner ring wall of the limiting ring can abut against the outer circumferential surface of the fastening bolt to form a seal, making it difficult for the fastening bolt to deflect in the inner wall of the fastening hole, thereby improving the limiting stability of the fastening bolt in the inner wall of the fastening hole.

[0022] Optionally, the fastening assembly further includes multiple limiting pistons, each corresponding to a limiting ring bladder. A limiting cavity is provided on the inner wall of the inflation channel near the limiting ring bladder for the limiting piston to slide. The limiting cavity penetrates the inner wall of the inflation channel and faces the outer wall of the limiting ring bladder. A positioning cavity is provided on the end face of the inflation piston facing the limiting cavity for the end of the limiting piston to slide. A guide surface is provided on the end face of the limiting piston that abuts against the positioning cavity. The guide surface is arc-shaped and convex. When the end of the fastening bolt passes through the fastening hole and is threaded and fixed to the inner wall of the fastening hole, the end face of the inflation piston is flush with the surface of the injection seat. The guide surface abuts against the inner wall of the positioning cavity and guides the limiting piston to slide towards the limiting ring bladder. The end face of the limiting piston presses against the surface of the limiting ring bladder, and the guide surface is flush with the inner wall of the inflation channel and abuts against the surface of the inflation piston.

[0023] By adopting the above technical solution, when the end of the fastening bolt passes through the fastening hole and is threaded and fixed to the inner wall of the fastening hole, the end face of the fastening bolt abuts against the end face of the inflation piston and drives the inflation piston to approach the inflation channel. The end face of the inflation piston is flush with the surface of the injection seat. The guide surface abuts against the inner wall of the positioning cavity and guides the limiting piston to slide towards the limiting ring bladder. The guide surface is flush with the inner wall of the inflation channel and abuts against the surface of the inflation piston. The end face of the limiting piston away from the guide surface presses against the outer circumferential surface of the limiting ring bladder. The inner ring wall of the limiting ring bladder is pressurized and expands and abuts against the outer circumferential surface of the fastening bolt to form a limit, thereby providing a fastening force between the outer circumferential surface of the fastening bolt and the inner ring wall of the limiting ring bladder.

[0024] Optionally, the fastening assembly further includes a plurality of elastic elements II, each corresponding to a limiting piston. One end of the elastic element II in the elastic direction is connected to the inner wall of the limiting cavity, and the other end of the elastic element II in the elastic direction is connected to the surface of the limiting piston. The elastic element II has the elastic force to drive the limiting piston to slide towards the inflation channel, and the guide surface protrudes from the inner wall of the inflation channel and abuts against the inner wall of the positioning cavity.

[0025] By adopting the above technical solution, when the elastic element one forces the inflation piston to slide away from the injection seat, and the end of the inflation piston protrudes from the surface of the injection seat, and the positioning cavity connects to the limiting cavity, the elastic element two forces the limiting piston to slide towards the inflation channel, the guide surface protrudes from the inner wall of the inflation channel and abuts against the inner wall of the positioning cavity, and the end of the limiting piston away from the guide surface eliminates the squeezing of the limiting ring, thereby realizing the automatic reset of the limiting piston.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. The guide channel design allows the two colors of adhesive to be distributed alternately in the cavity. The adhesive in the cavity is extruded through the outlet to form a zebra-like film with the two colors alternating. The film does not need to be printed with color, reducing the processing steps and shortening the processing cycle, thereby reducing the processing cost of the film.

[0028] 2. The module and fixing base are designed so that the module, fixing base and injection base can be disassembled, which makes it easy to clean the inner wall of the cavity and the inner wall of the discharge port, thus improving the ease of use of the film mold;

[0029] 3. The fastening bolts allow for a detachable connection between the injection seat and the module, facilitating the cleaning and replacement of the injection seat. Attached Figure Description

[0030] Figure 1 is a schematic diagram of the overall structure in an embodiment of this application.

[0031] Figure 2 is a cross-sectional view of an embodiment of this application, mainly showing the cavity and the discharge port.

[0032] Figure 3 is a cross-sectional view of an embodiment of this application, mainly showing the guide channel.

[0033] Figure 4 is a partial cross-sectional view of an embodiment of this application, mainly showing the fastening components.

[0034] Explanation of reference numerals in the attached drawings: 1. Die head; 11. Module; 111. Cavity; 112. Outlet; 113. Injection port; 114. Guide channel; 115. Fastening hole two; 12. Fixing seat; 2. Injection seat; 21. Inlet; 22. Fastening hole one; 23. Inflation channel; 24. Limiting ring cavity; 25. Limiting cavity; 3. Fastening assembly; 31. Fastening bolt; 32. Fastening ring bladder; 33. Inflation piston; 331. Positioning cavity; 332. Buffer surface; 34. Elastic element one; 35. Elastic element two; 36. Fastening ring; 37. Limiting ring bladder; 38. Limiting piston; 381. Guide surface. Detailed Implementation

[0035] The present application will be further described in detail below with reference to Figures 1-4.

[0036] This application discloses a thin film mold. Referring to Figures 1 and 2, a film mold includes a mold head 1 and an injection seat 2 detachably connected to the mold head 1. The mold head 1 includes at least two modules 11 and at least two fixing seats 12. In this embodiment, there are two modules 11 and two fixing seats 12. One end of the two modules 11 in the length direction is fixed to the surface of one fixing seat 12 by bolts at intervals, and the other end of the two modules 11 in the length direction is fixed to the surface of the other fixing seat 12 by bolts at intervals. The injection seat 2 is connected to one end of the two modules 11 in the height direction. A cavity 111 for injecting adhesive is left between the end faces of the two modules 11 facing each other. An outlet 112 for extruding adhesive is left between the end faces of the two modules 11 facing each other. The outlet 112 communicates with the cavity 111 and is located at the end of the module 11 away from the injection seat 2. Both end faces of the injection seat 2 are provided with inlets 21, which correspond one-to-one with the modules 11 and penetrate the surface of the injection seat 2 in the direction close to the modules 11.

[0037] Referring to Figures 2 and 3, each end face of module 11 facing the inlet 21 is provided with a material inlet 113. Multiple guide channels 114 are provided at intervals on the inner wall of the material inlet 113. The guide channels 114 connect the cavity 111 and the material inlet 113, and the guide channels 114 on the two modules 11 are arranged alternately.

[0038] Referring to Figures 2 and 3, when it is necessary to produce a zebra-shaped film with two colors alternating, the operator injects the two required colors of adhesive into the two feed ports 21 one by one. The adhesive passes through the feed port 21 and the injection port 113 in sequence and enters the cavity 111 through the guide channel 114. The guide channels 114 of the two modules 11 are staggered to ensure that the two colors of adhesive are distributed alternately in the cavity 111. The adhesive in the cavity 111 is extruded from the discharge port 112 to form a zebra-shaped film with two colors alternating, so that the film does not need to be printed with color, reducing the processing steps of the film, shortening the processing cycle of the film, and thus reducing the processing cost of the film.

[0039] Referring to Figure 4, a fastening assembly 3 connects the injection seat 2 and the module 11. The fastening assembly 3 enables a detachable connection between the injection seat 2 and the module 11, facilitating cleaning and replacement of the injection seat 2. The fastening assembly 3 includes multiple fastening bolts 31, multiple fastening ring bladders 32, multiple inflatable pistons 33, multiple elastic elements 34, multiple elastic elements 35, multiple fastening rings 36, multiple limiting ring bladders 37, and multiple limiting pistons 38. Multiple fastening holes 22 are spaced apart on the surface of the injection seat 2 for the ends of the fastening bolts 31 to pass through. The axis and the height direction of the injection seat 2 are parallel to each other. The fastening hole 1 22 passes through the outer wall of the injection seat 2 along its own axis and faces the surface of the module 11. The end face of the module 11 facing the fastening hole 1 22 is provided with a fastening hole 2 115 for the threaded end of the fastening bolt 31 to be tightened. When the injection seat 2 is placed on two modules 11, the fastening hole 1 22 and the fastening hole 2 115 correspond one-to-one and are connected. The end of the fastening bolt 31 passes through the fastening hole 1 22 and is threaded and fixed to the inner wall of the fastening hole 2 115, realizing the detachable connection between the injection seat 2 and the module 11.

[0040] Referring to Figure 4, the material of the fastening ring 32 can be rubber or silicone. In this embodiment, the material of the fastening ring 32 is rubber, which has a certain deformation capability. Multiple fastening rings 32 are connected at intervals on the surface of the injection seat 2. The fastening rings 32 correspond one-to-one with the fastening holes 22. The axis of the fastening ring 32 and the axis of the fastening hole 22 coincide. The inner wall of the fastening ring 32 can abut against the outer circumferential surface of the fastening bolt 31 to form a limit, so that the fastening bolt 31 is not easy to deflect in the fastening hole 22, thereby improving the connection stability between the injection seat 2 and the module 11.

[0041] Referring to Figure 4, multiple fastening rings 36 are spaced apart on the surface of the injection seat 2. Each fastening ring 36 corresponds to a fastening ring bladder 32. The axis of the fastening ring 36 and the axis of the fastening ring bladder 32 coincide. The inner wall of the fastening ring 36 abuts against the outer wall of the fastening ring bladder 32, causing the surface of the fastening ring bladder 32 to deform and tighten in a direction closer to the axis of the fastening ring bladder 32. This allows control over the deformation direction of the fastening ring bladder 32, thereby increasing the fastening force between the inner wall of the fastening ring bladder 32 and the outer circumference of the fastening bolt 31.

[0042] Referring to Figure 4, the material of the inflation piston 33 can be rubber or silicone. In this embodiment, the material of the inflation piston 33 is rubber, which has a certain deformation capability. In this embodiment, the inflation piston 33 is a ring. The surface of the injection seat 2 facing the fastening bolt 31 is provided with an inflation channel 23 for the inflation piston 33 to slide. The sliding direction of the inflation piston 33 is parallel to the axis of the fastening hole 22, and the inflation channel 23 is connected to the inner cavity of the fastening ring bladder 32. The elastic element 34 can be a compression spring or a tension spring. In this embodiment, the elastic element 34 is a compression spring, which has a certain deformation capability. The elastic element 34 corresponds to the inflation piston 33. One end of the elastic element 34 in the elastic direction is connected to the bottom wall of the inflation channel 23, and the other end of the elastic element 34 in the elastic direction is connected to the surface of the inflation piston 33. The elastic element 34 has the elastic force to drive the inflation piston 33 to slide away from the inflation channel 23, and the end of the inflation piston 33 tends to protrude from the surface of the injection seat 2.

[0043] Referring to Figure 4, when the end of the fastening bolt 31 passes through the fastening hole 22 and is threaded and fixed to the inner wall of the fastening hole 115, the end face of the fastening bolt 31 abuts against the end face of the inflation piston 33 and drives the inflation piston 33 to slide towards the inflation channel 23. The end face of the inflation piston 33 is flush with the surface of the injection seat 2. At the same time, the air pressure in the inflation channel 23 increases, and the air in the inflation channel 23 enters the inner cavity of the fastening ring bladder 32. The inner ring wall of the fastening ring bladder 32 abuts against the outer circumferential surface of the fastening bolt 31 to form a limit, further increasing the fastening force between the inner ring wall of the fastening ring bladder 32 and the outer circumferential surface of the fastening bolt 31.

[0044] Referring to Figure 4, the material of the limiting ring 37 can be rubber or silicone. In this embodiment, the material of the limiting ring 37 is rubber, which has a certain deformation capability. The limiting ring 37 corresponds one-to-one with the fastening hole 22. The inner wall of the fastening hole 22 is coaxially provided with a limiting ring cavity 24 to accommodate the limiting ring 37. The outer ring wall of the limiting ring 37 abuts against the inner wall of the limiting ring 37. The inner ring wall of the limiting ring 37 can abut against the outer circumferential surface of the fastening bolt 31 to form a seal, so that the fastening bolt 31 is not easy to deflect in the inner wall of the fastening hole 22, and further improves the limiting stability of the fastening bolt 31 in the fastening hole 22.

[0045] Referring to Figure 4, the limiting piston 38 and the limiting ring bladder 37 correspond one-to-one. The inner wall of the inflation channel 23 near the limiting ring cavity 24 is provided with a limiting cavity 25 for the limiting piston 38 to slide. The sliding direction of the limiting piston 38 is perpendicular to the sliding direction of the inflation piston 33. The limiting cavity 25 penetrates the inner wall of the inflation channel 23 and connects to the limiting ring cavity 24 in the direction close to the limiting ring cavity 24. The end face of the inflation piston 33 facing the limiting cavity 25 is provided with a positioning cavity 331 for the end of the limiting piston 38 to slide. The end face of the limiting piston 38 that abuts against the positioning cavity 331 is provided with a guide surface 381. The guide surface 381 is in the shape of a circular arc protrusion. The inner wall of the positioning cavity 331 away from the elastic element 34 is provided with a buffer surface 332. The inclination height of the buffer surface 332 increases as the distance to the axis of the inflation piston 33 decreases.

[0046] Referring to Figure 4, the second elastic element 35 can be a compression spring or a tension spring. In this embodiment, the second elastic element 35 is a compression spring, which has a certain deformation capability. One end of the second elastic element 35 in the elastic force direction is connected to the inner wall of the limiting cavity 25, and the other end of the second elastic element 35 in the elastic force direction is connected to the surface of the limiting piston 38. The second elastic element 35 has the elastic force to drive the limiting piston 38 to slide towards the direction close to the air passage 23, and the guide surface 381 protrudes from the inner wall of the air passage 23 and abuts against the inner wall of the positioning cavity 331.

[0047] Referring to Figure 4, when the elastic element 34 forces the inflation piston 33 to slide away from the inflation channel 23, and the end of the inflation piston 33 protrudes from the surface of the injection seat 2, the limiting cavity 25 connects to the positioning cavity 331. The elastic element 35 forces the limiting piston 38 to slide closer to the inflation channel 23, and the guide surface 381 protrudes from the inner wall of the inflation channel 23 and abuts against the inner wall of the positioning cavity 331. When the end of the fastening bolt 31 passes through the fastening hole 22 and is threaded and fixed to the inner wall of the fastening hole 115, the end face of the fastening bolt 31 abuts against the surface of the inflation piston 33 and drives the inflation piston 33 closer to the inflation channel 23. The end face of the inflation piston 33 then contacts the injection seat 2. The surface of seat 2 is flush with the guide surface 381, which moves along the inner wall of the positioning cavity 331 close to the buffer surface 332. The buffer surface 332 abuts against the guide surface 381 and guides the limiting piston 38 to slide towards the limiting ring cavity 24. The communication effect between the positioning cavity 331 and the limiting cavity 25 disappears. The guide surface 381 is flush with the inner wall of the inflation channel 23 and abuts against the surface of the inflation piston 33. The end face of the limiting piston 38 away from the guide surface 381 presses against the outer ring wall of the limiting ring bladder 37, causing the inner ring wall of the limiting ring bladder 37 to be deformed under pressure and press against the outer circumferential surface of the fastening bolt 31 to form a seal, further improving the fastening force between the inner ring wall of the limiting ring bladder 37 and the outer ring wall of the fastening bolt 31.

[0048] The implementation principle of a film mold in this application embodiment is as follows: When it is necessary to produce a zebra-shaped film with two colors alternating, the operator injects the two required colors of adhesive into the two feed ports 21 one by one. The adhesive passes through the feed port 21 and the injection port 113 in sequence and enters the cavity 111 through the guide channel 114. The guide channels 114 of the two modules 11 are staggered to ensure that the two colors of adhesive are distributed alternately in the cavity 111. The adhesive in the cavity 111 is extruded from the discharge port 112 to form a zebra-shaped film with two colors alternating, so that the film does not need to be printed with color, reducing the processing steps of the film, shortening the processing cycle of the film, and thus reducing the processing cost of the film.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A thin film mold, characterized in that: The device includes a mold head (1) and an injection seat (2) connected to the mold head (1). The mold head (1) has a cavity (111) for injecting adhesive. At least two injection ports (113) are spaced apart on the end face of the mold head (1) facing the injection seat (2). A plurality of guide channels (114) are spaced apart on the inner wall of the injection ports (113). The guide channels (114) connect the cavity (111) and the injection ports (113), and the guide channels (114) on at least two of the injection ports (113) are staggered. The material base (2) has a feed port (21) corresponding to the surface of the injection port (113). The feed port (21) penetrates the surface of the injection base (2). The material passes through the feed port (21) and the injection port (113) in sequence and enters the cavity (111) through the guide channel (114). The end face of the die head (1) away from the injection base (2) has a discharge port (112). The discharge port (112) is connected to the cavity (111). The material in the cavity (111) is extruded through the discharge port (112) to form a film.

2. A film die according to claim 1, wherein: The mold head (1) includes at least two modules (11) and at least two fixed seats (12). The two ends of the length direction of the at least two modules (11) are connected one-to-one to the opposite surfaces of the two fixed seats (12). The cavity (111) and the discharge port (112) are located on the opposite end faces of the two modules (11). The injection port (113) corresponds one-to-one with the module (11). The injection seat (2) is connected between the two modules (11).

3. A thin film mold according to claim 2, characterized in that: A fastening assembly (3) is connected between the injection seat (2) and the module (11). The fastening assembly (3) includes multiple fastening bolts (31). Multiple fastening holes (22) are provided at intervals on the surface of the injection seat (2), through which the ends of the fastening bolts (31) pass. The fastening holes (22) penetrate the outer wall of the injection seat (2). The end face of the module (11) facing the fastening holes (22) is provided with fastening holes (115) for tightening the ends of the fastening bolts (31). The ends of the fastening bolts (31) pass through the fastening holes (22) and are threaded and fixed to the inner wall of the fastening holes (115) to form a limit.

4. A thin film mold according to claim 3, characterized in that: The fastening assembly (3) includes a plurality of fastening rings (32), which are spaced apart and connected to the surface of the injection seat (2). Each fastening ring (32) corresponds to a fastening hole (22), and the axis of the fastening ring (32) coincides with the axis of the fastening hole (22). The inner wall of the fastening ring (32) can abut against the outer circumferential surface of the fastening bolt (31) to form a limit.

5. A thin film mold according to claim 4, characterized in that: The fastening assembly (3) also includes multiple inflation pistons (33). The surface of the injection seat (2) facing the fastening bolt (31) is provided with an inflation channel (23) for the inflation piston (33) to slide. The inflation channel (23) is connected to the inner cavity of the fastening ring bladder (32). When the end of the fastening bolt (31) passes through the fastening hole one (22) and is threaded and fixed to the inner wall of the fastening hole two (115), the end face of the fastening bolt (31) abuts against the end of the inflation piston (33) protruding from the injection seat (2) and drives the inflation piston (33) to approach the inflation channel (23).

6. A thin film mold according to claim 5, characterized in that: The fastening assembly (3) also includes a plurality of elastic elements (34), each of which corresponds to an inflation piston (33). One end of the elastic element (34) in the elastic direction is connected to the bottom wall of the inflation channel (23), and the other end of the elastic element (34) in the elastic direction is connected to the end face of the inflation piston (33). The elastic element (34) has the elastic force to drive the inflation piston (33) to slide away from the inflation channel (23), and the end of the inflation piston (33) tends to protrude from the surface of the injection seat (2).

7. A film die according to claim 4 wherein: The fastening assembly (3) also includes a plurality of fastening rings (36), which are spaced apart on the surface of the injection seat (2). Each fastening ring (36) corresponds to a fastening hole (22). The axis of the fastening ring (36) coincides with the axis of the fastening hole (22). The inner wall of the fastening ring (36) and the outer circumferential surface of the fastening bolt (31) clamp the two sides of the fastening ring bladder (32) to form a limit.

8. A thin film mold according to claim 6, characterized in that: The fastening assembly (3) also includes multiple limiting rings (37), each of which corresponds to a fastening hole (22). The outer ring wall of the limiting ring (37) is connected to the inner wall of the fastening hole (22), and the inner ring wall of the limiting ring (37) can abut against the outer circumferential surface of the fastening bolt (31) to form a seal.

9. A thin film mold according to claim 8, characterized in that: The fastening assembly (3) also includes multiple limiting pistons (38), each corresponding to a limiting ring bladder (37). The inflation channel (23) near the inner wall of the limiting ring bladder (37) has a limiting cavity (25) for sliding of the limiting piston (38). The limiting cavity (25) penetrates the inner wall of the inflation channel (23) and faces the outer wall of the limiting ring bladder (37). The end face of the inflation piston (33) facing the limiting cavity (25) has a positioning cavity (331) for sliding of the end of the limiting piston (38). The end face of the limiting piston (38) that abuts against the positioning cavity (331) has a guide. The guide surface (381) is in the shape of a circular arc protrusion. When the end of the fastening bolt (31) passes through the fastening hole one (22) and is threaded and fixed to the inner wall of the fastening hole two (115), the end face of the inflation piston (33) is flush with the surface of the injection seat (2). The guide surface (381) abuts against the inner wall of the positioning cavity (331) and guides the limiting piston (38) to slide towards the limiting ring bladder (37). The end face of the limiting piston (38) squeezes the surface of the limiting ring bladder (37), and the guide surface (381) is flush with the inner wall of the inflation channel (23) and abuts against the surface of the inflation piston (33).

10. A thin film mold according to claim 9, characterized in that: The fastening assembly (3) also includes a plurality of elastic elements (35), each of which corresponds to a limiting piston (38). One end of the elastic element (35) in the elastic direction is connected to the inner wall of the limiting cavity (25), and the other end of the elastic element (35) in the elastic direction is connected to the surface of the limiting piston (38). The elastic element (35) has the elastic force to drive the limiting piston (38) to slide towards the air passage (23), and the guide surface (381) protrudes from the inner wall of the air passage (23) and abuts against the inner wall of the positioning cavity (331).

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