Automatic film roll changing and rewinding device and continuous non-stop production method for prepreg

Abstract

The present invention relates to the technical field of composite material preparation equipment, and specifically to an automatic film roll changing and rewinding device and a method for continuously producing prepregs without stopping. The device comprises a first film roll unwinding mechanism, a second film roll unwinding mechanism, a first plastic film roll rewinding mechanism, a second plastic film roll rewinding mechanism, a pressing mechanism, and a heating mechanism. The heating mechanism is provided with spaced pressing mechanisms on both sides, and each pressing mechanism is provided with a first film roll unwinding mechanism on the outside. The front end of each first film roll unwinding mechanism is spaced apart from a second film roll unwinding mechanism, and the rear end of each first film roll unwinding mechanism is provided with a first plastic film roll rewinding mechanism, and the rear end of each second film roll unwinding mechanism is provided with a second plastic film roll rewinding mechanism. The present invention can realize automatic roll changing of sandwich structure films, realize a method for continuously producing prepregs without stopping, improve equipment production efficiency, and reduce personnel workload.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material preparation equipment, and in particular to an automatic film roll-changing and roll-joining device and a continuous non-stop production method for prepregs. Background Art

[0002] During the preparation of composite materials (prepregs), adhesive films are required to laminate carbon fibers. Therefore, adhesive films are an important raw material for prepreg production. Adhesive films have a sandwich structure, with resin sandwiched between a bottom release paper layer and an upper plastic film layer. During use, the plastic film needs to be peeled off.

[0003] The existing composite machine (prepreg production equipment) uses a single-axis unwinding film, and the maximum supply length of a single roll of film is 3,000 meters, while the length of a single roll of carbon fiber is 20,000 meters. One roll of carbon fiber can match the production of 7 batches of 3,000 meters of film. The existing production process requires that after the film of the current material roll is exhausted, the machine needs to be stopped to manually change the film roll and paste and splice the film roll. The above work seriously affects the production progress of the equipment and cannot achieve continuous production of prepregs. In addition, during the roll changing process, some prepregs in the equipment that have not completed prepreg are scrapped due to equipment suspension.

[0004] The existing automatic film unwinding equipment is used to unwind a single layer of paper followed by a single layer of plastic film. The film used in composite material production needs to be peeled off from the surface during use, so the existing automatic unwinding equipment for paper or plastic film cannot be used. Summary of the Invention

[0005] The present invention addresses the aforementioned issues in the prior art by providing an automatic film reel-changing and rewinding device and a method for continuous, non-stop prepreg production. The device is used for unwinding film for prepreg production, enabling automatic rewinding of sandwich-structured film. This device enables continuous, non-stop prepreg production, improving equipment production efficiency and reducing personnel workload.

[0006] The basic scheme of the present invention is: an automatic film roll changing and rewinding device, including a first film roll unwinding mechanism, a second film roll unwinding mechanism, a first plastic film roll winding mechanism, a second plastic film roll winding mechanism, a pressing mechanism and a heating mechanism, the upper and lower sides of the heating mechanism are provided with spaced pressing mechanisms, the outside of each of the pressing mechanisms is provided with a first film roll unwinding mechanism, the front end of each of the first film roll unwinding mechanisms is provided with a second film roll unwinding mechanism at intervals, the rear end of each of the first film roll unwinding mechanisms is provided with a first plastic film roll winding mechanism, and the rear end of each of the second film roll unwinding mechanisms is provided with a second plastic film roll winding mechanism.

[0007] Preferably, the heating mechanism includes a heating roller and a tension roller. Two heating rollers are provided, one above the other, and a tension roller is provided spaced apart on the upper side of the rear end of each heating roller. The tension rollers can be adjusted in position or quantity as needed, and the tension control of the equipment can be open-loop controlled. The heating rollers facilitate roll changing.

[0008] Preferably, each laminating mechanism includes a laminating roller and a guide roller. Two laminating rollers are provided, spaced apart on the left and right sides, with a guide roller positioned between their lower ends. Two laminating rollers are provided, one made of rubber and the other of Teflon. The Teflon laminating roller contacts the resin surface during lamination. Teflon is less susceptible to adhesive adhesion and therefore has minimal impact on the resin. The Teflon laminating roller does not come into contact with the film during the production process.

[0009] Preferably, each of the first film roll unwinding mechanisms includes a first film roll, a guide roller, a cooling roller and a tension roller. The outer surface of the first film roll is provided with a first film. The tension roller is arranged on the inner side of the rear end of the first film roll. The cooling roller is arranged on the inner side of the rear end of the tension roller. Guide rollers are provided between the first film roll and the tension roller, and between the tension roller and the cooling roller.

[0010] Preferably, each of the first plastic film roll winding mechanisms includes a first plastic film roll, a guide roller and a tension roller, the first plastic film roll is correspondingly arranged at the rear ends of multiple first film rolls, and the side of the first plastic film roll is connected to the first plastic film, the tension roller is arranged on the inner side of the front end of the first plastic film roll, and guide rollers are provided between the first plastic film roll and the tension roller, and between the tension roller and the cooling roller.

[0011] Preferably, each second film roll unwinding mechanism includes a second film roll, a guide roller, a cooling roller and a tension roller. The outer surface of the second film roll is provided with a second film. The tension roller is arranged on the inner side of the rear end of the second film roll. The cooling roller is arranged on the inner side of the rear end of the tension roller. Guide rollers are provided between the second film roll and the tension roller, and between the tension roller and the cooling roller.

[0012] Preferably, each second plastic film roll winding mechanism includes a second plastic film roll, a guide roller and a tension roller. The second plastic film roll is correspondingly arranged at the rear ends of multiple first film rolls, and the side of the second plastic film roll is connected to the second plastic film. The tension roller is arranged on the inner side of the front end of the second plastic film roll, and guide rollers are provided between the second plastic film roll and the tension roller, and between the tension roller and the cooling roller.

[0013] Preferably, a cutter is provided on the outside of each laminating roller, and a plurality of guide rollers are provided between each cutter and each cooling roller. The cutter is provided to facilitate cutting the film at any time according to the control information.

[0014] Preferably, a paper break sensor is provided between each of the heating rollers and the laminating roller. When the paper break sensor detects that the film is broken, the control system issues an alarm and performs a shutdown and speed reduction process.

[0015] The present invention discloses an automatic film roll-changing and rewinding device and a method for continuously producing prepreg without stopping the machine, comprising the following steps:

[0016] S1, supplying a second plastic film from a second plastic film roll, cooling the second plastic film on the surface of the second plastic film roll by a cooling roller, and then collecting the second plastic film roll;

[0017] S2, Roll Change Preparation: Pre-apply high-temperature-resistant double-sided tape to the end of the first film roll. Install the first film roll in the designated position and pre-route it along a designated path through guide rollers to the cooling roller. At the cooling roller, peel the first plastic film from the surface of the first film. The peeled first plastic film is then pulled along the designated path to the first film roll station and attached to the reel of the already installed first film roll. Activate the first film roll rewinding function to tension the first plastic film. When the tension sensor receives a signal, the first film roll enters the closed-loop, low-tension rewinding state for roll change. Continue pulling the end of the first film along the designated path until it reaches the lamination roller, which has radial and axial markings on its surface. Install the end of the first film within the fan-shaped vacuum suction area of ​​the lamination roller, aligning the end with the axial positioning markings. Observe the second film's edge at the scale line on the opposing lamination roller in the working state. Pull the edge of the first film below the same scale line on the lamination roller. Press the pre-loading completion button, and the lamination rollers, driven by the servo motor, rotate until the end of the first film is 0.5 mm beyond the line connecting the centers of the two lamination rollers. At this point, the roll change preparation is complete.

[0018] S3, roll changing: When the tail of the second film is insufficient, the control system determines based on the prepreg production status that the second film cannot meet the production of a new batch of prepregs. When the prepreg being produced is completed, the control system sends a roll changing signal to the lamination roller. The lamination roller closes, and the end of the first film is pressed against the second film driven by the lamination roller (the lamination roller does not rotate in the moving state). When the first film and the second film are in contact, the lamination roller runs at the same surface line speed as the prepreg running speed, and the second film is cut off synchronously and instantly by the cutter. The first film and the second film are firmly attached to each other under the pressure of the lamination roller. When the high-temperature tape between the first film and the second film passes through the lamination point of the lamination roller, the lamination roller separates, and the control system controls the unwinding tension of the first film roll through the feedback signal of the tension sensor in a closed loop. When the adhesive tape adhesion point of the first film and the second film enters the heating roller, the equipment is supplied by the first film, and the roll changing is completed;

[0019] S4: During the roll changing process, when the paper break sensor detects that the film is broken, the control system issues an alarm and stops the machine and slows down.

[0020] S5: After the roll change is completed, the second film cut part is manually / automatically recovered and subsequently disassembled out of the fixed station to wait for the new roll of film to be installed in place;

[0021] S6, the above double-station roll changing work process is the same. When the tail material of the first film roll is insufficient, the second film roll repeats the above roll changing work.

[0022] The working principle and advantages of the present invention are:

[0023] (1) The present invention is an automatic roll-changing and rewinding device for unwinding adhesive films used in prepreg production. This device can realize automatic roll-changing of sandwich-structured adhesive films. This device can realize a continuous and non-stop production method for prepreg, improve equipment production efficiency, and reduce the workload of personnel.

[0024] (2) The present invention is mainly used for the automatic rewinding of composite material films, and can be used for separating and automatically rewinding two layers of materials (release paper and resin are regarded as one layer of material).

[0025] (3) The guide rollers of the present invention can be increased, decreased or adjusted according to actual needs.

[0026] (4) The position or number of the tension rollers of the present invention can be adjusted as needed, and the equipment tension control can be open-loop controlled.

[0027] (5) The cooling roller of the present invention is used to cool the resin, reduce the resin temperature, and reduce the resin viscosity, which is beneficial for peeling off the plastic film.

[0028] (6) The plastic film of the present invention is mainly used to protect the resin. After the plastic film is peeled off and the resin is exposed, the resin layer cannot be guided by the roller to prevent the resin from being contaminated or missing.

[0029] (7) The present invention comprises one rubber laminating roller and one Teflon laminating roller. The Teflon laminating roller contacts the resin surface during laminating. Teflon is not easily adhered to adhesives, and therefore has little effect on the resin. The Teflon laminating roller does not contact the adhesive film during the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the automatic film roll changing and rewinding device of the present invention.

[0031] The reference numerals involved in the accompanying drawings are:

[0032] First adhesive film roll 1.1, second adhesive film roll 1.2, first plastic film roll 2.1, second plastic film roll 2.2, guide roller 3, cooling roller 4, tension roller 5, cutter 6, pressing roller 7, heating roller 8, paper break sensor 9, first adhesive film 10.1, second adhesive film 10.2, first plastic film 11.1, second plastic film 11.2. DETAILED DESCRIPTION

[0033] The following is a further detailed description through specific implementation methods:

[0034] Example 1:

[0035] like Figure 1 As shown, the automatic film roll changing and rewinding device includes a first film roll unwinding mechanism, a second film roll unwinding mechanism, a first plastic film roll winding mechanism, a second plastic film roll winding mechanism, a pressing mechanism and a heating mechanism. The upper and lower sides of the heating mechanism are provided with spaced pressing mechanisms, the outer side of each pressing mechanism is provided with a first film roll unwinding mechanism, the front end of each first film roll unwinding mechanism is provided with a second film roll unwinding mechanism at intervals, the rear end of each first film roll unwinding mechanism is provided with a first plastic film roll winding mechanism, and the rear end of each second film roll unwinding mechanism is provided with a second plastic film roll winding mechanism.

[0036] The heating mechanism includes a heating roller 8 and a tension roller 5. Two heating rollers 8 are provided, one above the other. A tension roller 5 is provided at intervals on the upper side of the rear end of each heating roller 8. The tension rollers 5 can be adjusted in position or quantity as needed. The tension control of the equipment can be open-loop controlled. The heating rollers 8 are provided to facilitate roll changing.

[0037] Each laminating mechanism includes two laminating rollers 7 and a guide roller 3. Two laminating rollers 7 are provided, spaced apart on the left and right sides. A guide roller 3 is positioned between the lower ends of the two laminating rollers 7. The two laminating rollers 7 are one rubber laminating roller and the other Teflon laminating roller. During lamination, the Teflon laminating roller contacts the resin surface. Teflon is less susceptible to adhesive adhesion, thus minimizing the effect on the resin. The Teflon laminating roller does not come into contact with the film during the production process.

[0038] Each first film roll unwinding mechanism includes a first film roll 1.1, a guide roller 3, a cooling roller 4 and a tension roller 5. The outer surface of the first film roll 1.1 is provided with a first film 10.1, the tension roller 5 is arranged on the inner side of the rear end of the first film roll 1.1, and the cooling roller 4 is arranged on the inner side of the rear end of the tension roller 5. Guide rollers 3 are provided between the first film roll 1.1 and the tension roller 5, and between the tension roller 5 and the cooling roller 4.

[0039] Each first plastic film roll winding mechanism includes a first plastic film roll 2.1, a guide roller 3 and a tension roller 5. The first plastic film roll 2.1 is correspondingly arranged at the rear end of multiple first film rolls 1.1, and the side of the first plastic film roll 2.1 is externally connected to the first plastic film 11.1. The tension roller 5 is arranged on the inner side of the front end of the first plastic film roll 2.1. Guide rollers 3 are provided between the first plastic film roll 2.1 and the tension roller 5, and between the tension roller 5 and the cooling roller 4.

[0040] Each second film roll unwinding mechanism includes a second film roll 1.2, a guide roller 3, a cooling roller 4 and a tension roller 5. The outer surface of the second film roll 1.2 is provided with a second film 10.2, the tension roller 5 is arranged on the inner side of the rear end of the second film roll 1.2, the cooling roller 4 is arranged on the inner side of the rear end of the tension roller 5, and a guide roller 3 is provided between the second film roll 1.2 and the tension roller 5, and between the tension roller 5 and the cooling roller 4.

[0041] Each second plastic film roll winding mechanism includes a second plastic film roll 2.2, a guide roller 3 and a tension roller 5. The second plastic film roll 2.2 is correspondingly arranged at the rear ends of multiple first film rolls 1.1, and the side of the second plastic film roll 2.2 is externally connected to the second plastic film 11.2. The tension roller 5 is arranged on the inner side of the front end of the second plastic film roll 2.2. Guide rollers 3 are provided between the second plastic film roll 2.2 and the tension roller 5, and between the tension roller 5 and the cooling roller 4.

[0042] Each laminating roller 7 is provided with a cutter 6 on the outside, and a plurality of spaced guide rollers 3 are provided between each cutter 6 and each cooling roller 4. The cutter 6 is provided to facilitate cutting the film at any time according to the control information.

[0043] A paper break sensor 9 is provided between each heating roller 8 and the pressing roller 7. When the paper break sensor 9 detects that the film is broken, the control system issues an alarm and performs a shutdown and speed reduction process.

[0044] The automatic film roll-changing and rewinding device and the prepreg continuous production method are as follows:

[0045] S1, the second film 10.2 is supplied from the second film roll 1.2, the second plastic film 11.2 on the surface of the second film roll 1.2 is cooled by the cooling roller 4 and then collected by the second plastic film roll 2.2;

[0046] S2, Roll Change Preparation: Pre-attach high-temperature-resistant double-sided tape to the end of the first film 10.1. Install the first film roll 1.1 at the designated location and guide the first film 10.1 along the designated path through the guide rollers 3 to the cooling roller 4. At the cooling roller 4, peel the first plastic film 11.1 from the surface of the first film 10.1. Pull the peeled first plastic film 11.1 along the designated path to the first plastic film roll 2.1 station and attach it to the reel of the already installed first plastic film roll 2.1. Activate the reeling function of the first plastic film roll 2.1, tightening the first plastic film 11.1. When the tension sensor receives a signal, the first plastic film roll 2.1 enters the closed-loop, low-tension reeling state for roll change. Continue to pull the end of the first film 10.1 along the set path to the position of the lamination roller 7. The surface of the lamination roller 7 is provided with radial marking lines and axial scale lines. Install the end of the first film 10.1 in the fan-shaped vacuum adsorption area of ​​the lamination roller 7, aligning the end with the axial positioning marking line of the lamination roller 7; observe the edge of the second film 10.2 in the working state. The scale line value on the surface of the opposite lamination roller 7 is observed, and the edge of the first film 10.1 is pulled under the scale line of the same value on the lamination roller 7. Activate the pre-installation completion button, and the lamination roller 7, driven by the servo motor, rotates the end of the first film 10.1 to 10 mm above the line connecting the centers of the two lamination rollers 7. At this point, the preparation for reel change is complete;

[0047] S3, reel change: When the second film 10.2 is running low on prepreg production, the control system determines, based on the prepreg production status, that the second film 10.2 cannot meet the production needs of a new batch of prepreg. When the prepreg currently in production is completed, the control system sends a reel change signal to the laminating roller 7. The laminating roller 7 closes, and the end of the first film 10.1 is pressed against the second film 10.2 by the laminating roller 7 (the laminating roller 7 does not rotate when in motion). As the first and second films 10.1 and 10.2 come into contact, the laminating roller 7 rotates at a surface speed equal to the prepreg's running speed. Simultaneously, the second film 10.2 is instantly cut by the cutter 6. The pressure of the laminating roller 7 ensures that the first and second films 10.1 and 10.2 adhere firmly to each other. After the high-temperature tape between the first and second films 10.1 and 10.2 passes through the laminating point of the laminating roller 7, the laminating roller 7 separates, and the control system controls the unwinding tension of the first film roll 1.1 in a closed loop using the feedback signal from the tension sensor. When the adhesive tape portion of the first adhesive film 10.1 and the second adhesive film 10.2 enters the heating roller 8, the device is fed by the first adhesive film 10.1 and the roll changing work is completed;

[0048] S4, during the roll changing process, when the paper break sensor 9 detects that the film is broken, the control system issues an alarm and stops the machine and slows down;

[0049] S5, after the roll change is completed, the second film 10.2 is manually / automatically recovered at the cut part, and then disassembled out of the fixed station and wait for the new roll of film to be installed in place;

[0050] S6, the above double-station roll changing process is the same. When the tail material of the first film roll 1.1 is insufficient, the second film roll 1.2 repeats the above roll changing process.

[0051] The above is only an embodiment of the present invention. Common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the guidance of this application. Some typical well-known structures or well-known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. Automatic film roll changing and rewinding device, characterized by: It includes a first film roll unwinding mechanism, a second film roll unwinding mechanism, a first plastic film roll winding mechanism, a second plastic film roll winding mechanism, a pressing mechanism and a heating mechanism. The upper and lower sides of the heating mechanism are provided with spaced pressing mechanisms. The outer side of each pressing mechanism is provided with a first film roll unwinding mechanism. The front end of each first film roll unwinding mechanism is provided with a second film roll unwinding mechanism at intervals. The rear end of each first film roll unwinding mechanism is provided with a first plastic film roll winding mechanism. The rear end of each second film roll unwinding mechanism is provided with a second plastic film roll winding mechanism. The heating mechanism includes a heating roller and a tension roller. There are two heating rollers, which are distributed up and down. A tension roller is provided at an interval on the upper side of the rear end of each heating roller. Each of the laminating mechanisms includes a laminating roller and a guide roller. Two laminating rollers are provided, and the two laminating rollers are spaced apart on the left and right. One laminating roller is a rubber laminating roller and the other is a Teflon laminating roller. During laminating, the Teflon laminating roller contacts the resin surface, and a guide roller is provided between the lower ends of the two laminating rollers. Each of the first film roll unwinding mechanisms includes a first film roll, a guide roller, a cooling roller, and a tension roller. The first film is provided on the outer surface of the first film roll, and the end of the first film is mounted in the fan-shaped vacuum adsorption area of ​​the laminating roller. The tension roller is arranged on the inner side of the rear end of the first film roll, and the cooling roller is arranged on the inner side of the rear end of the tension roller. Guide rollers are provided between the first film roll and the tension roller, and between the tension roller and the cooling roller. Each of the first plastic film roll winding mechanisms includes a first plastic film roll, a guide roller, and a tension roller. The first plastic film roll is correspondingly arranged at the rear ends of the plurality of first film rolls, and the side of the first plastic film roll is externally connected to the first plastic film. The tension roller is arranged at the inner side of the front end of the first plastic film roll. Guide rollers are provided between the first plastic film roll and the tension roller, and between the tension roller and the cooling roller. Each second film roll unwinding mechanism includes a second film roll, a guide roller, a cooling roller, and a tension roller. The second film is provided on the outer surface of the second film roll. The tension roller is arranged on the inner side of the rear end of the second film roll. The cooling roller is arranged on the inner side of the rear end of the tension roller. Guide rollers are provided between the second film roll and the tension roller, and between the tension roller and the cooling roller. Each second plastic film roll winding mechanism includes a second plastic film roll, a guide roller and a tension roller. The second plastic film roll is correspondingly arranged at the rear ends of multiple first film rolls, and the side of the second plastic film roll is connected to the second plastic film. The tension roller is arranged on the inner side of the front end of the second plastic film roll. Guide rollers are provided between the second plastic film roll and the tension roller, and between the tension roller and the cooling roller.

2. The automatic film roll changing and rewinding device according to claim 1, characterized in that: A cutter is provided on the outside of each laminating roller, and a plurality of guide rollers distributed at intervals are provided between each cutter and each cooling roller.

3. The automatic film roll-changing and rewinding device according to claim 2, characterized in that: A paper break sensor is provided between each of the heating rollers and the pressing roller.

4. A method for continuous non-stop production of prepregs, characterized by: The automatic film roll changing and rewinding device according to claim 3 is used, and specifically comprises the following steps: S1, supplying a second plastic film from a second plastic film roll, cooling the second plastic film on the surface of the second plastic film roll by a cooling roller, and then collecting the second plastic film roll; S2, roll change preparation work: pre-stick a high-temperature resistant double-sided tape on the end of the first film, install the first film roll at the set position, pre-pass the first film through the guide rollers along the set path to the cooling roller, peel off the first plastic film on the surface of the first film at the cooling roller position, pull the peeled first plastic film along the set path to the first plastic film roll station and stick it to the winding shaft of the installed first plastic film roll, start the winding function of the first plastic film roll, tighten the first plastic film, and when the tension sensor receives the signal, the first plastic film roll enters the roll change closed-loop low-tension winding state, and continues to pull the first plastic film roll. The end of the first film is positioned along the set path to the laminating roller, which has radial markings and axial scale lines on its surface. The end of the first film is installed in the fan-shaped vacuum adsorption area of ​​the laminating roller, with the end aligned with the axial positioning marking line of the laminating roller. Observe that the edge of the second film is at the scale line value on the surface of the opposite laminating roller in the working state. The edge of the first film is pulled to the scale line of the same value on the laminating roller. Activate the pre-installation completion button. The laminating roller is driven by the servo motor to rotate the end of the first film to 10 mm above the line connecting the centers of the two laminating rollers. At this time, the roll change preparation work is completed. S3, roll change: When the second film tail is insufficient, the control system determines based on the prepreg production status that the second film cannot meet the production of a new batch of prepreg. When the prepreg being produced is completed, the control system sends a roll change signal to the lamination roller; The pressing roller closes, and the end of the first film is pressed against the second film under the drive of the pressing roller. In the moving state, the pressing roller does not rotate. When the first and second films are in contact, the pressing roller runs at a surface linear speed that is the same as the running speed of the prepreg. At the same time, the second film is cut synchronously and instantly by the cutter. The first and second films are firmly attached to each other under the pressure of the pressing roller. When the high-temperature tape between the first and second films passes through the pressing point of the pressing roller, the pressing roller separates. The control system controls the unwinding tension of the first film roll through the feedback signal of the tension sensor in a closed loop. When the adhesive tape portion between the first and second films enters the heating roller, the equipment is supplied by the first film, and the roll changing operation is completed. S4: During the roll changing process, when the paper break sensor detects that the film is broken, the control system issues an alarm and stops the machine and slows down. S5: After the roll change is completed, the second film cut part is manually or automatically recovered and subsequently disassembled out of the fixed station to wait for the new roll of film to be installed in place; S6, the above double-station roll changing work process is the same. When the tail material of the first film roll is insufficient, the second film roll repeats the above roll changing work.

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