Film pre-cutting device

Abstract

The utility model provides a film pre-cutting device which comprises a film releasing unit, a film cutting unit and a film cutting unit. Part of the film guide rollers are connected with a driving device or a tension device and are used for conveying the composite film roll; the pre-cutting unit is arranged between different film guide rollers and is used for pre-cutting one surface, close to the bonding, of the composite film roll, so that a cutting mark penetrating through the two layers of composite film rolls is formed on the composite film roll, and a first area and second areas which are positioned in the first area and are isolated from each other are formed on the surface, close to the pre-cutting unit, of the composite film roll; the film connecting unit is used for continuously pasting an adhesive film on the cut surface of the composite film roll, so that the connection relation between the first area and each second area is recovered; and the pressing unit is used for pressing the composite film roll bonded with the adhesive film. According to the film pre-cutting device provided by the invention, the problem of glue retention caused by bonding of other film layers and the workbench for bearing the wafer can be avoided, and the film pre-cutting device is relatively simple in operation structure and relatively high in operation efficiency.

Description

Technical Field

[0001] The present application belongs to the technical field of semiconductor equipment, and more specifically, to a film pre-cutting device. Background Art

[0002] Backside Coating Tape is mainly used in the WLCSP (Wafer-Level Chip-Scale Package) process as a special non-substrate film to protect and reinforce the back of the wafer, suppress light and reduce adverse effects on the circuit surface. It consists of three layers: base film (isolation protective film), back film and cover film (isolation protective film). After the wafer is ground and before cutting, the back film is attached to the back of the wafer to improve the wafer strength and reduce the occurrence of fragments during cutting.

[0003] In the related technology, the adhesive film pasting process is to first peel off the cover film of the adhesive film, then send the bottom film and the adhesive film to the wafer film pasting station, then cut the adhesive film into the pasting area and the residual area through the cutting mechanism, then peel off the residual area of ​​the adhesive film through the peeling mechanism, and finally paste the adhesive area of ​​the adhesive film on the wafer. However, the overall structure of the aforementioned cutting method is cumbersome and complex, and the cutting efficiency is low; at the same time, the process of peeling off the cover film first and then cutting is also prone to leaving residual glue, affecting the quality of the film pressing and the cutting effect of the subsequent process. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a film pre-cutting device to solve the technical problems existing in the prior art such as complex cutting structure, low efficiency and easy glue retention.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted in the embodiment of the present application is to provide a film pre-cutting device, which includes:

[0006] A film releasing unit, used for releasing a composite film roll, wherein the composite film roll comprises three film layers;

[0007] A film guiding unit, comprising a plurality of film guiding rollers, some of which are connected with a driving device or a tension device, and the film guiding unit is used to convey the composite film roll;

[0008] A pre-cutting unit is arranged between different film guide rollers, and is used to pre-cut the side of the composite film roll close to the bonding, so as to form a cutting mark penetrating the two layers of the composite film roll, and to form a first area and a second area located in the first area and isolated from each other on the surface of the composite film roll close to the pre-cutting unit;

[0009] A film connecting unit, disposed between the pre-cutting unit and the film guide roller and close to the pre-cutting unit, for continuously sticking an adhesive film on the cut side of the composite film roll to restore the connection between the first area and each of the second areas;

[0010] A pressing unit is used to press the composite film roll bonded with the adhesive film.

[0011] Optionally, the film connecting unit includes a frame and a unwinding mechanism, a film guiding mechanism and a film pressing mechanism arranged on the frame; the unwinding mechanism is used to unwind the adhesive film, the film guiding mechanism is used to transfer the adhesive film to the film pressing mechanism, and the film pressing mechanism can be swung on the frame so that the adhesive film on it can approach the composite film roll and adhere to the first area and the second area.

[0012] Optionally, the film pressing mechanism includes a film pressing wheel and a clamping wheel configured to always press against the film pressing wheel, the adhesive film passes through a gap between the clamping wheel and the film pressing wheel and is pushed by the film pressing mechanism to adhere to the surface of the composite film roll.

[0013] Optionally, the film pressing mechanism includes a first swing arm swingably arranged on the frame, a cylinder is arranged on the frame, and a connecting rod mechanism is connected between the piston end of the cylinder and the first swing arm.

[0014] Optionally, the film pressing mechanism further comprises a second swing rod swingably arranged on the frame, an elastic member is connected between the second swing rod and the frame, the clamping wheel is arranged on the second swing rod, and the elastic member is used to make the clamping wheel press against the film pressing.

[0015] Optionally, a cutting blade is provided on one side of the film pressing mechanism close to the pre-cutting unit; and / or, the frame body includes a fixed frame and a movable frame, the movable frame is slidably arranged on the fixed frame along the length direction of the fixed frame, and the unwinding mechanism, the film guide wheel and the film pressing mechanism are all arranged on the movable frame.

[0016] Optionally, the pre-cutting unit includes a die-cutting power roller and a die-cutting knife roller driven by the die-cutting power roller, a die-cutting knife is circumferentially arranged on the die-cutting knife roller, and the composite film roll is inserted between the die-cutting power roller and the die-cutting knife roller.

[0017] Optionally, the gap between the die-cutting blade roller and the die-cutting power roller can be adjusted.

[0018] Optionally, an elastic member is connected between the die-cutting blade roller and the die-cutting power roller, and a driving member is provided on the side of either the die-cutting blade roller or the die-cutting power roller away from the other, and the driving member is used to push the die-cutting blade roller or the die-cutting power roller to squeeze or release the elastic member to move closer to or away from each other.

[0019] Optionally, the die-cutting knife is detachably arranged on the die-cutting knife roller.

[0020] The film pre-cutting device provided in the embodiment of the present application has at least the following beneficial effects:

[0021] A pre-cutting unit and a film connecting unit are provided, and the pre-cutting unit directly die-cuts the composite film roll in a conveying state, and the film connecting unit adheres the adhesive tape to the surface of the die-cut composite film roll to restore the connection relationship. In this way, when the film layer is subsequently peeled off, the different areas on the film layer connected by the adhesive film can be easily peeled off and only the part that needs to be bonded to the wafer is left on the composite film roll. In the subsequent film pasting operation, since only the part that needs to be bonded to the wafer is left on the film layer, the problem of adhesive retention caused by the bonding of other film layers to the workbench supporting the wafer can be avoided, and the operation structure is relatively simple and the operation efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 This is a schematic diagram of a film pre-cutting device in some embodiments of the present application;

[0024] Figures 2 to 3 A three-dimensional diagram of a membrane connection unit in some embodiments of the present application;

[0025] Figure 4 A three-dimensional diagram of a pre-cutting unit in some embodiments of the present application;

[0026] Figure 5 Schematic diagram of adhesive film being bonded to a composite film roll in some embodiments of the present application;

[0027] Figure 6 Schematic diagram of a composite film roll in some embodiments of the present application. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] It should be noted that when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or indirectly on the other element.

[0031] When an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0034] In the description of the present application, “plurality” means two or more than two, unless otherwise clearly and specifically defined.

[0035] Please also read Figures 1 to 6 , the film pre-cutting device provided in the embodiment of the present application is now described.

[0036] It should be noted that the film pre-cutting device described in the present application is used to unwind and cut the composite film roll A. Figure 6 The aforementioned composite film roll A includes three film layers, namely, the first film layer A1, the second film layer A2 and the third film layer A3. Among them, the second film layer A2 is used to bond to the wafer surface, the first film layer A1 covers the bonding surface of the second film layer A2, and the third film layer A3 covers the upper surface of the second film layer A2. When attaching the film, the first film layer A1 needs to be torn off first to expose the bonding surface of the second film layer A2, and the third film layer A3 is torn off after the second film layer A2 is bonded to the wafer surface.

[0037] refer to Figures 1 to 5Specifically, the film pre-cutting device of the embodiment of the present application includes a frame and a film placing unit 100, a film guiding unit, a pre-cutting unit 300, a film connecting unit 400 and a pressing unit 500 arranged on the frame.

[0038] refer to Figure 1 The film unwinding unit 100 is used to release the composite film roll A, and includes an unwinding shaft 110 and a driving motor 120. The composite film roll A is wound on the unwinding shaft 110 and the unwinding shaft 110 is driven by the driving motor 120 to rotate to release the composite film roll A.

[0039] The film guide unit includes a plurality of film guide rollers 200 arranged at different positions on the frame. Some of the film guide rollers 200 are connected to a driving device, which may be a rotating motor 341, so that the film guide rollers 200 have a driving force, so that they can pull the composite film roll A together for transmission; some of the film guide rollers 200 are connected to a tension device, which may be a cylinder, so that the film guide rollers 200 can adjust their tension on the composite film roll A, so that the composite film roll A is always in a tensioned state; in addition, some of the film guide rollers 200 are only rotatably arranged on the frame, and are used to guide and transmit the composite film roll A.

[0040] The pre-cutting unit 300 is arranged between different film guide rollers 200, and is used to pre-cut the side of the composite film roll A close to the bonding (that is, the surface of the first film layer A1) to form a cutting mark penetrating the first film layer A1 and the second film layer A2 on the composite film roll A, and to form a first area A11 and a second area A12 located in the first area A11 and isolated from each other on the first film layer A1, and at the same time form a third area A21 and a fourth area A22 on the second film layer A2.

[0041] 6 , the first area A11 is directly opposite to the third area A21 , the second area A12 is directly opposite to the fourth area A22 , and the shapes of the second area A12 and the fourth area A22 are also the shapes of the wafer.

[0042] It should be understood that in the subsequent film lamination operation, the first area A11, the second area A12 on the first film layer A1 and the third area A21 on the second film layer A2 are torn off together, and after the fourth area A22 on the second film layer A2 is bonded to the wafer surface, the third film layer A3 is torn off again.

[0043] It can be understood that the cutting method of the pre-cutting unit 300 can be roller cutting, for example, the die-cutting roller forms a cutting mark on the surface of the first film layer A1 by rolling on the surface of the composite film roll A; it can also be a cutting knife set on a robot, and the robot drives the cutting knife to cut, for example, when cutting, the composite film roll A pauses, and the robot drives the cutting knife to cut on the surface of the first film layer A1 to form a cutting mark; it is not limited to this.

[0044] refer to Figures 1 to 4 The film connection unit 400 is disposed between the pre-cutting unit 300 and the film guide roller 200, and is used to bond the continuous adhesive film B to the first film layer A1, so that the first area A11 and each second area A12 on the first film layer A1 can be restored to a connection relationship. In this way, when the first area A11, the second area A12 on the first film layer A1 and the third area A21 on the second film layer A2 are torn off, since the first area A11 and the second area A12 are connected and fixed, the first film layer A1 can be completely torn off at one time, so there is no need to tear off the first area A11 and the second area A12 separately, thereby saving operation steps and improving operation efficiency.

[0045] refer to Figure 1 and Figure 5 It should be understood that the film connecting unit 400 is arranged near the pre-cutting unit 300, so that the adhesive film B can be bonded as soon as possible after the composite film roll A is cut, so as to avoid the composite film roll A after cutting from falling off or wrinkling in the first area A11 and / or the second area A12 during the subsequent transmission process, which may affect the bonding quality of the adhesive film B.

[0046] The pressing unit 500 is disposed behind the film connecting unit 400 and is used to press the composite film roll A bonded with the adhesive film B so that the adhesive film B is firmly bonded to the surface of the first film layer A1 . The pressing unit 500 may be a pressing roller abutting against the film guide roller 200 .

[0047] It can be understood that, in the film pre-cutting device of the embodiment of the present application, after the composite film roll A is cut, the first film layer A1 thereon is formed with the first area A11 and the second area A12, and the third area A21 and the fourth area A22 are formed on the second film layer A2, and the first area A11 and the second areas A12 are connected by the adhesive film B. In this way, during the subsequent film pasting, firstly, the first area A11 and the second area A12 can be torn off together without being torn off separately, thereby simplifying the film peeling process; secondly, since the third area A21 is directly opposite to the first area A11, after it is torn off along with the first film layer A1, only the fourth area A22 is left on the third film layer A3, so that during the subsequent film pasting operation, only the fourth area A22 with strong adhesive force is left on the composite film roll A to face the surface of the wafer, thereby avoiding the problem of adhesive residue caused by the adhesion of other areas on the composite film roll A to the film pasting workbench.

[0048] refer to Figure 2 and Figure 3In some embodiments, the film connection unit 400 includes a frame 410 and an unwinding mechanism 420, a film guiding mechanism 430 and a film pressing mechanism 440 disposed on the frame 410; the unwinding mechanism 420 is used to unwind the adhesive film B, the film guiding mechanism 430 is used to transfer the adhesive film B to the film pressing mechanism 440, and the film pressing mechanism 440 can be swingably disposed on the frame 410 so that the adhesive film B on it can approach the film layer and be attached to the first area A11 and the second area A12. By swinging the film pressing mechanism 440 on the frame 410, after replacing the adhesive film B roll, the front end length of the adhesive film B can be cut first and then the film pressing mechanism 440 can be swing to push the adhesive film B to the surface of the first film layer A1. At the same time, during the installation process of the adhesive film B, a certain distance can be maintained from the composite film roll A to prevent the adhesive film B from accidentally touching the composite film roll A, so that the adhesive film B can finally be bonded to the surface of the composite film roll A in a flat state to ensure the bonding quality.

[0049] refer to Figure 2 and Figure 3 In some specific embodiments, the film pressing mechanism 440 includes a film pressing wheel 441 and a clamping wheel 442 configured to always press against the film pressing wheel 441. The adhesive film B passes through the gap between the clamping wheel 442 and the film pressing wheel 441 and is pushed by the film pressing mechanism 440 to adhere to the surface of the first film layer A1. It can be understood that the clamping wheel 442 can be pulled by the elastic member 447 to always press against the film pressing wheel 441.

[0050] By providing the clamping wheel 442, the surface of the adhesive film B can be fully rolled and flattened before being bonded to the surface of the first film layer A1, thereby avoiding the situation where the adhesive film B is wrinkled before being bonded to the surface of the first film layer A1 and affecting the bonding quality.

[0051] refer to Figure 2 and Figure 3 On the basis of the above embodiments, in a further embodiment, the film pressing mechanism 440 includes a first rocker arm 443 swingingly arranged on the frame 410, and the first rocker arm 443 is rotatably arranged on the frame 410 at one end away from the first film layer A1; a cylinder 445 is arranged on the frame 410, and a connecting rod mechanism 446 is connected between the piston end of the cylinder 445 and the first rocker arm 443.

[0052] Further, the axis direction of the cylinder 445 is parallel or substantially parallel to the length direction of the first swing rod 443. It should be noted that, in this embodiment, the aforementioned connecting rod mechanism 446 is a two-connecting rod mechanism 446, and one of the connecting rods is a crank. In this way, since the axis of the cylinder 445 is parallel to the length direction of the swing rod, the height of the frame 410 in the direction perpendicular to the length direction of the swing rod can be reduced, so as to improve the space utilization of the frame 410 and effectively reduce the volume of the frame 410.

[0053] refer to Figure 2and Figure 3 In some embodiments, the clamping wheel 442 is movably disposed on the first swing rod 443, and an elastic member 447 is connected between the clamping wheel 442 and the first swing rod 443, and the elastic member 447 can be a spring.

[0054] refer to Figure 2 and Figure 3 In other embodiments, the film pressing mechanism 440 further includes a second swing rod 444 swingably disposed on the frame 410, an elastic member 447 is connected between the second swing rod 444 and the frame 410, the clamping wheel 442 is disposed on the second swing rod 444, and the elastic member 447 is used to make the clamping wheel 442 press against the film pressing wheel 441. Similarly, the elastic member 447 can be a spring.

[0055] refer to Figure 2 and Figure 3 In some embodiments, a cutting blade 448 is provided at one end of the film pressing mechanism 440 close to the pre-cutting unit 300. Specifically, there is a certain distance between the cutting blade 448 and the film pressing wheel 441, which is used to accurately control the distance between the front end of the film B and the film pressing wheel 441 when the film B is pulled out after a roll of the film B is used up and a new roll of the film B is replaced, so as to avoid the distance between the front end of the film B and the film pressing wheel 441 being too long or too short to affect the bonding quality of the film B on the first film layer A1.

[0056] refer to Figure 2 In some embodiments, the frame 410 includes a fixed frame 411 and a movable frame 412. The fixed frame 411 is fixedly mounted on the frame, and the movable frame 412 is movably mounted on the fixed frame 411 along the length direction of the fixed frame 411. The unwinding mechanism 420, the film guide wheel, and the film pressing mechanism 440 are all mounted on the movable frame 412. In this way, when a roll of film B is used up, the movable frame 412 can be adjusted relative to the fixed frame 411 to facilitate placing a new roll of film B on the unwinding mechanism 420.

[0057] In some embodiments, the movable connection mechanism between the fixed frame 411 and the movable frame 412 includes but is not limited to a snap connection, a sliding connection, a screw connection, etc.

[0058] For example, in some specific embodiments, the connection between the fixed frame 411 and the movable frame 412 is a sliding connection, and the included angle between the sliding direction between the two and the conveying direction of the adhesive film B pasted on the composite film roll A is an acute angle, and during the sliding process of the movable frame 412, the axis of the adhesive film B and the axis of the composite film roll A are always located on the same vertical plane. In this way, after the movable frame 412 slides to the operating position, the front end of the adhesive film B is also moved to the bottom of the film belt, and the adhesive film B can be bonded to the composite film roll A by swinging the film pressing mechanism 440, and the adhesive film B can be prevented from accidentally touching the composite film roll A during the whole process.

[0059] Specifically, a slide rail is provided between the fixed frame 411 and the movable frame 412, and a locking structure is provided between the fixed frame 411 and the movable frame 412. The locking structure may be an abutment plate 452 provided on one of the fixed frame 411 and the movable frame 412, and a locking bolt 451 provided on the other of the fixed frame 411 and the movable frame 412. After the movable frame 412 is moved to the working position, the locking bolt 451 is tightened to abut against the abutment plate 452, thereby achieving locking and fixing of the movable frame 412.

[0060] refer to Figure 1 and Figure 4 In some embodiments, the pre-cutting unit 300 includes a die-cutting power roller 310 and a die-cutting knife roller 320, and the composite film roll A is passed through the die-cutting power roller 310 and the die-cutting knife roller 320, and the die-cutting power roller 310 and the die-cutting knife roller 320 are arranged in linkage.

[0061] refer to Figure 4 In some embodiments, a rotating motor 341 is provided on the frame, and gears 342 are provided on the same end of the die-cutting power roller 310 and the die-cutting knife roller 320 and on the output shaft of the rotating motor 341. The gears 342 are meshed with each other so that the rotating motor 341 can synchronously drive the die-cutting power roller 310 and the die-cutting knife roller 320 to rotate. In this way, the die-cutting power roller 310 and the die-cutting knife roller 320 can both rotate actively to effectively enhance the cutting effect.

[0062] Specifically, a die-cutting knife 321 is circumferentially arranged on the die-cutting knife roller 320, and the die-cutting knife 321 can be fixedly arranged or detachably arranged on the die-cutting knife roller 320. In the embodiment of detachable arrangement, the die-cutting knife roller 320 can be a magnetic roller, and the die-cutting knife 321 is fixedly arranged on the die-cutting guide roller by magnetic attraction.

[0063] In a further embodiment, the gap between the die-cutting knife roller 320 and the die-cutting power roller 310 can be adjusted. In this way, the cutting depth of the die-cutting knife 321 in the composite film roll A can be adjusted, so that the pre-cutting unit 300 can cut composite film rolls A of different thicknesses, thereby improving the adaptability of the pre-cutting unit 300 to composite film rolls A of different thicknesses.

[0064] refer to Figure 4Specifically, the die-cutting roller 320 and the die-cutting power roller 310 can be arranged in the following specific manner, namely: an elastic member 330 is connected between the die-cutting roller 320 and the die-cutting power roller 310, and a driving member 350 is arranged on a frame on a side of either the die-cutting roller 320 or the die-cutting power roller 310 away from the other, and the driving member 350 is used to push the die-cutting roller 320 or the die-cutting power roller 310 to squeeze or release the elastic member 330 to move closer to or away from each other. It can be understood that the elastic member 330 can be a spring.

[0065] For example, the driving member 350 may be disposed on one side of the die-cutting roller 320 or on one side of the die-cutting power roller 310. In some embodiments, the driving member 350 includes a fixed plate 351 and a movable plate 352 disposed on the frame, a roller 353 disposed on the movable plate 352 and in contact with the roller, and an adjusting hand wheel 354 disposed on the fixed plate 351 and used to push the movable plate 352 to move. In this way, by turning the adjusting hand wheel 354, the roller 353 is pressed against the die-cutting roller 320 or the die-cutting power roller 310, so that the elastic member 330 is compressed or released, thereby realizing the cutting depth adjustment of the composite film roll A by the die-cutting knife 321, so as to ensure that the cutting marks in the composite film rolls A of different thicknesses can penetrate the first film layer A1 and the second film layer A2.

[0066] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A film pre-cutting device, characterized in that: include: A film releasing unit, used for releasing a composite film roll, wherein the composite film roll comprises three film layers; A film guiding unit, comprising a plurality of film guiding rollers, some of which are connected with a driving device or a tension device, and the film guiding unit is used to convey the composite film roll; A pre-cutting unit is arranged between different film guide rollers, and is used to pre-cut the side of the composite film roll close to the bonding, so as to form a cutting mark penetrating the two layers of the composite film roll, and to form a first area and a second area located in the first area and isolated from each other on the surface of the composite film roll close to the pre-cutting unit; A film connecting unit, disposed between the pre-cutting unit and the film guide roller and close to the pre-cutting unit, for continuously sticking an adhesive film on the cut side of the composite film roll to restore the connection between the first area and each of the second areas; A pressing unit is used to press the composite film roll bonded with the adhesive film.

2. The film pre-cutting device according to claim 1, characterized in that: The film connecting unit includes a frame and a reeling mechanism, a film guiding mechanism and a film pressing mechanism arranged on the frame; the reeling mechanism is used to unwind the adhesive film, the film guiding mechanism is used to transfer the adhesive film to the film pressing mechanism, and the film pressing mechanism can be swung on the frame so that the adhesive film on it can approach the composite film roll and adhere to the first area and the second area.

3. The film pre-cutting device according to claim 2, characterized in that: The film pressing mechanism comprises a film pressing wheel and a clamping wheel which is arranged to always press against the film pressing wheel. The adhesive film passes through the gap between the clamping wheel and the film pressing wheel and is pushed by the film pressing mechanism to adhere to the surface of the composite film roll.

4. The film pre-cutting device according to claim 3, characterized in that: The film pressing mechanism comprises a first swing rod swingably arranged on the frame, a cylinder is arranged on the frame, and a connecting rod mechanism is connected between the piston end of the cylinder and the first swing rod.

5. The film pre-cutting device according to claim 3, characterized in that: The film pressing mechanism also includes a second swing rod swingably arranged on the frame, an elastic member is connected between the second swing rod and the frame, the clamping wheel is arranged on the second swing rod, and the elastic member is used to make the clamping wheel press against the film pressing wheel.

6. The film pre-cutting device according to claim 2, characterized in that: A cutting blade is arranged on one side of the film pressing mechanism close to the pre-cutting unit; and / or the frame body includes a fixed frame and a movable frame, the movable frame is slidably arranged on the fixed frame along the length direction of the fixed frame, and the unwinding mechanism, the film guiding mechanism and the film pressing mechanism are all arranged on the movable frame.

7. The film pre-cutting device according to any one of claims 1 to 6, characterized in that: The pre-cutting unit includes a die-cutting power roller and a die-cutting knife roller driven by the die-cutting power roller. A die-cutting knife is circumferentially arranged on the die-cutting knife roller. The composite film roll is inserted between the die-cutting power roller and the die-cutting knife roller.

8. The film pre-cutting device according to claim 7, characterized in that: The gap between the die-cutting blade roller and the die-cutting power roller can be adjusted.

9. The film pre-cutting device according to claim 8, characterized in that: An elastic member is connected between the die-cutting roller and the die-cutting power roller, and a driving member is arranged on the side of either the die-cutting roller or the die-cutting power roller away from the other, and the driving member is used to push the die-cutting roller or the die-cutting power roller to squeeze or release the elastic member to move closer to or away from each other.

10. The film pre-cutting device according to claim 7, characterized in that: The die-cutting knife is detachably arranged on the die-cutting knife roller.

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