CN113478794A

CN113478794A - Thin film processing device and method

Info

Publication number: CN113478794A
Application number: CN202110766322.7A
Authority: CN
Inventors: 张坤; 李辉; 张磊磊; 姚从琪
Original assignee: Hefei Lucky Science and Technology Industry Co Ltd
Current assignee: Hefei Lucky Science and Technology Industry Co Ltd
Priority date: 2021-07-07
Filing date: 2021-07-07
Publication date: 2021-10-08
Anticipated expiration: 2041-07-07
Also published as: CN113478794B

Abstract

The invention discloses a film processing device, which comprises a transverse drawing box and a transverse drawing unit, wherein the transverse drawing unit comprises a transverse drawing clamping roller unit and a transverse drawing cutter unit which are arranged in the transverse drawing box, and the transverse drawing box comprises an N3 area, a cooling 1 area and a cooling 2 area which are sequentially arranged in the transverse drawing box along the drawing direction of a film; the transverse pulling and clamping roller unit comprises at least two sets of clamping roller sets; the at least two sets of clamping roller components are arranged in the cooling 1 area and the cooling 2 area; each set of the clamping roller group realizes clamping of two sides of the film in the width direction; the transverse drawing cutter unit and the transverse drawing clamping roller unit are sequentially arranged along the film traction direction, and the transverse drawing cutter unit is arranged in the N3 area and used for cutting the sheet edge of the film. And the film processing method is also disclosed, so that the film can be separated from the clamping of the chain clamp before entering the cooling area, the longitudinal thermal shrinkage rate is improved, and the problem that the film is warped due to the fact that the film is dug to the middle under the action of gravity without the action of transverse tension is solved.

Description

Thin film processing device and method

Technical Field

The invention relates to a film drawing device, in particular to a thin film processing device and a thin film processing method.

Background

The transverse drawing machine (TDO) has the main function of heating and transversely drawing the film sheet to ensure that the film has uniform thickness and stable mechanical property. The transverse drawing machine has two endless rotating special chains with clamps to clamp the two edges of the sheet material and support on variable width guide track for synchronous operation. The sheet is first preheated in slightly increased preheating section, transversely stretched in stretching area with great expansion angle and heat treated in parallel and contracted heat treating area to set and relax the film. And finally, cooling in a parallel cooling area to finish the transverse stretching work of the film.

The film to be prepared flat must be subjected to transverse and longitudinal heat shrinkage in the processing process, and after the film is clamped by chain clamps in a TDO box, the distance between adjacent chain clamps is fixed and cannot be changed in a transverse pulling box, so that the clamped film cannot be freely shrunk in the longitudinal direction, and longitudinal heat shrinkage is difficult to occur. Therefore, the temperature of the crystallization zone and the cooling zone can be adjusted only, but the thermal shrinkage of the film is difficult to reduce.

Meanwhile, the existing chain clamp opening device of the transverse pulling chain device is arranged at a transverse pulling outlet, at the moment, a film is already shaped, the thermal shrinkage can not be carried out in the longitudinal direction, and products requiring low shrinkage rate can not be produced.

There are two approaches to this problem in the world today. The method comprises the steps that firstly, a synchronous stretching method is adopted, namely, magnetic suspension chain clamps are selected as transverse pull chain clamps, each chain clamp is provided with a motor which can independently run in a track when the chain clamps run on the transverse pull track, and the chain clamps run at different speeds in different areas of transverse pull, so that clamped films have longitudinal and transverse tension, but the method has extremely high cost, the cost is increased by more than 1 hundred million RMB, the longitudinal traction force is small, the method is only used for preparing the films below 12 mu, and meanwhile, the structure is complex and the failure rate is high; the other method is a chain clamp system with a chain contraction function, the distance between the chain clamp and the chain clamp is not fixed, when the chain clamp runs to a cooling area, a special contraction structure in the rail forcibly shortens the distance between the chain clamp and the chain clamp by about 1cm, so that the film releases stress in the longitudinal direction, a contraction space is formed in the longitudinal direction of the film, and the longitudinal heat shrinkage rate is improved.

Both of the above methods involve a huge investment and a long modification period for 99% of domestic production lines, and the performance price of longitudinal heat shrinkage is lower for only improving a plurality of performances. The invention can put a small amount of cost into the existing production line for fixing the distance between the chain clamps, and can obtain better longitudinal thermal shrinkage rate.

Disclosure of Invention

Because chain clamp and rail set width are 400mm, traditional integral type clamp roller can't be installed to the case that violently draws, and bellows about violently drawing the internal installation of case, the film can only be in extremely narrow space operation, can't install the draw gear who has the roller. The invention creatively divides the traditional integrated clamping roller into an upper device and a lower device which are arranged at the upper part and the lower part of the chain clamp track.

The horizontal pulling box body consists of preheating, stretching, crystallizing and cooling sections from front to back, each section is directly provided with a natural section, and the section is not provided with an air box and only plays a role in isolating the sections. The scheme design of the invention aims to enable the film to get rid of the chain clamp constraint in the cooling and shaping section and to be fully shaped, thereby obtaining good thermal shrinkage.

In order to overcome the defects of the prior art, the technical scheme of the invention is as follows: a film processing device comprises a transverse pulling box and a transverse pulling unit, wherein the transverse pulling unit is positioned in the transverse pulling box and comprises two chain clamp rails 7 and a parallel and endlessly revolving transverse pulling chain 19 arranged on the chain clamp rails 7; the transverse pulling unit comprises: the transverse pulling clamping roller unit and the transverse pulling cutter unit are arranged in the transverse pulling box; the transverse drawing box comprises an N3 area, a cooling 1 area and a cooling 2 area in the transverse drawing box, wherein the N3 area, the cooling 1 area and the cooling 2 area are sequentially arranged along the drawing direction of the film 1; the transverse pulling and clamping roller unit comprises at least two sets of clamping roller sets; the at least two sets of nip roll components are arranged in the cooling 1 area and the cooling 2 area; each set of the clamping roller group realizes clamping of two sides of the film 1 in the width direction; the transverse drawing cutter units and the transverse drawing clamping roller units are sequentially arranged along the film traction direction, and the transverse drawing cutter units are arranged in the N3 area and are used for cutting the edges of the film 1.

Preferably, 2. the transverse-pull cutter unit comprises a transverse-pull internal cutter 15, a cutter bracket 16, a cutter lifting component 17 and a control element 18; the transversely-pulled inner cutter 15 is positioned on the cutter support 16 and fixed on the cutter lifting component 17 together with the cutter support 16, and the control element 18 is used for adjusting the height of the cutter lifting component.

Preferably, the transverse pulling pinch roll unit is provided with a pinch roll set capable of clamping the edge of the film sheet; the pinch roll set comprises an upper pinch roll 2, an upper pinch roll bracket 3, an upper air cylinder fixing bracket 4, a rotary upper air cylinder 5, an upper pinch roll base 6, an electromagnetic valve 8, an air pipe 9, a rotary lower air cylinder 10, a lower pinch roll 11, a lower pinch roll bracket 12, a lower pinch roll base 13 and a lower air cylinder fixing bracket 14; the upper clamping roller 2 is arranged on the rotary upper cylinder 5 through the upper clamping roller bracket 3; the rotary upper cylinder 5 is arranged on the upper clamping roller base 6 through the upper cylinder fixing support 4, and the upper clamping roller base 6 is arranged above the chain clamp rail 7; the lower clamping roller 11 is arranged on the rotary lower cylinder 10 through the lower clamping roller bracket 12; the rotary lower air cylinder 10 is mounted on the lower clamping roller base 13 through the lower air cylinder fixing support 14, and the lower clamping roller base 13 is mounted below the chain clamp rail 7;

the rotary upper cylinder 5 and the rotary lower cylinder 10 are connected with the electromagnetic valve 8 through the air pipe 9, and simultaneously act under the action of the electromagnetic valve 8, and a clamping space of the film is formed through the upper clamping roller 2 and the lower clamping roller 11.

Preferably, the clamping roller mechanism and the cutting system are both connected to a film rupture detection system, and once a film rupture occurs, the clamping roller and the cutter can automatically pop open to ensure the safety of personnel and equipment.

Preferably, go up the pinch roll support 3 with all be equipped with the screw hole 31 of arc waist type groove structure and the screw hole 32 of centre of a circle groove structure on the pinch roll support 12 down, the central line of the screw hole 31 of arc waist type groove structure is for using the circular arc that the central point of the screw hole 32 of centre of a circle groove structure is the centre of a circle, the both ends of the screw hole 31 of arc waist type groove structure with the same radial circular arc of the screw hole 32 of centre of a circle groove structure is terminated, the trough edge of the screw hole 31 of arc waist type groove structure with the circular arc is tangent.

Preferably, go up cylinder fixed bolster 4 and lower cylinder fixed bolster 14 and equally divide and do not be equipped with two sets of parallel but highly

different screw holes

41 and 42,

screw hole

41 and 42 all design into straight waist type groove structure, the central line in straight waist type groove all is mutually perpendicular with film 1, the upper and lower both ends in straight waist type groove all end with the tangent semicircle end with the groove edge, the width in straight waist type groove with the diameter of semicircle is the same. The mounting height of the air cylinder is adjusted according to the clamping force requirement of the clamping roller so as to achieve the desired clamping force and ensure that the clamping force of the film is not loosened.

Preferably, the upper clamping roll 2 and the lower clamping roll 11 are made of two materials respectively, wherein the upper clamping roll 2 is made of a rubber material, the lower clamping roll 11 is made of a metal material, and the surface of the metal material of the lower clamping roll 11 is subjected to carving treatment, so that firstly, the characteristic that a rubber product has a certain deformation amount under the action of pressure is utilized, and meanwhile, the friction coefficient between the carving of the lower pressing roll 11 and the film 1 is effectively increased, and the clamped surface of the film is firmer and less prone to loosening.

Preferably, the combined film 1 is cut to the final cutting edge amount of 120-150 mm, the length of the clamping roller is designed to be 80-120 mm, the clamping force on the film is narrow, the film is easy to loosen, and the waste of finished products is easily caused.

The invention also provides a method for preparing the low-shrinkage film, which comprises the following steps:

step 1, when a low-shrinkage film is stretched to pass through the transverse pulling cutter unit, lifting the cutter lifting component to lift the cutter inside the transverse pulling from a non-working position to a working position, cutting the edges of the film sheet, wherein the cut film is easy to warp towards the middle to become uneven under the action of gravity and hot wind because the edges lose the clamping tension action of the transverse pulling chain clamp; meanwhile, the film is contracted by releasing stress in the longitudinal direction, but the longitudinal contraction rate is inconsistent due to unevenness, so that the flatness of the cut film is ensured by the clamping roller device.

Step 2, starting the electromagnetic valve, and simultaneously rotating the rotary upper cylinder 5 and the rotary lower cylinder 10 of the two sets of clamping roller sets to finish the action of clamping the film 1;

and 3, clamping and taking away the film edges by a transverse zipper clamp after the step 2 is finished, clamping the film edges by an upper clamping roller 2 and a lower clamping roller 11 to improve the longitudinal heat shrinkage rate, and flattening the film to overcome the defect that the film is warped towards the middle pocket under the action of gravity without transverse tension.

And 4, step 4: and (4) rolling the film 1 obtained in the step (3) to obtain a finished film 1.

Compared with the prior art, the invention has the following beneficial effects:

1. the film can be separated from the clamping of the chain clamp before the transverse drawing cooling area, so that the longitudinal heat shrinkage rate of each area of the film is uniformly improved.

2. The clamping action to the film is completed by the action of the electromagnetic valve on the cylinder, and the problem that the film is warped towards the middle pocket due to the influence of gravity under the action of no transverse tension is solved.

3. The split design of the upper and lower clamping rollers is adopted, so that the influence of small space of a transverse pulling box body and large middle frame is overcome.

4. The clamping force is increased by utilizing the difference of the friction coefficients between the different materials of the upper clamping roller and the lower clamping roller and the film, and the clamping effect is ensured.

5. The clamping roller mechanism adopts the rotary air cylinder, so that the installation space is saved, the compression roller support can be adjusted up, down, left and right, the clamping angle of the clamping roller can be changed according to different speeds of the films, and the clamping effect of the films with different thicknesses is ensured.

6. The screw holes of the clamping roller base and the cylinder fixing support are designed into a waist-shaped groove structure, and the clamping force of the film is ensured not to loosen according to the adjustment of the actual size.

Drawings

FIG. 1 is a schematic view of a non-working position of an assembly diagram of a clamping roller mechanism;

FIG. 2 is a schematic view of the assembly drawing working position of the clamping roller mechanism;

FIG. 3 is a schematic view of a nip roll;

FIG. 4 is a schematic view of a nip roll base;

FIG. 5 is a schematic view of a nip roll stand;

FIG. 6 is a schematic view of a cylinder mount;

fig. 7 is a schematic view of a cross-cutting unit.

In the figure, 1, a thin film; 2. an upper nip roll; 3. an upper nip roll support; 31. a screw hole of an arc waist type groove structure; 32. a screw hole of a circle center groove structure; 4. an upper cylinder fixing bracket; 41. screw holes of straight waist-shaped groove structures; 42. screw holes of straight waist-shaped groove structures; 5. rotating the upper cylinder; 6. an upper nip roll base; 7. a chain clamp rail; 8. an electromagnetic valve; 9. an air tube; 10. rotating the lower cylinder; 11. a lower nip roll; 12. a lower nip roll support; 13. a lower nip roll base; 14. a lower cylinder fixing bracket; 15. transversely pulling the inner cutter; 16. a cutter holder; 17. a cutter lifting member; 18. a control element; 19. and transversely pulling the chain.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example one

As shown in fig. 2, the film processing apparatus according to the present invention includes a transverse drawing box and a transverse drawing unit, the transverse drawing unit is located in the transverse drawing box, and the transverse drawing unit includes two chain clamp rails 7 and a parallel endless transverse drawing chain 19 mounted on the chain clamp rails 7; the transverse pulling unit comprises: the transverse pulling clamping roller unit and the transverse pulling cutter unit are arranged in the transverse pulling box; the transverse drawing box comprises an N3 area, a cooling 1 area and a cooling 2 area in the transverse drawing box, wherein the N3 area, the cooling 1 area and the cooling 2 area are sequentially arranged along the drawing direction of the film 1; the transverse pulling and clamping roller unit comprises two sets of clamping roller sets; the two sets of clamping roller components are arranged in the cooling 1 area and the cooling 2 area; each set of the clamping roller group realizes clamping of two sides of the film 1 in the width direction; the transverse drawing cutter units and the transverse drawing clamping roller units are sequentially arranged along the film traction direction, and the transverse drawing cutter units are arranged in the N3 area and are used for cutting the edges of the film 1.

The transverse pulling cutter unit comprises a transverse pulling internal cutter 15, a cutter bracket 16, a cutter lifting component 17 and a control element 18; the transversely-pulled inner cutter 15 is positioned on the cutter support 16 and fixed on the cutter lifting component 17 together with the cutter support 16, and the control element 18 is used for adjusting the height of the cutter lifting component.

The transverse pulling pinch roll unit is provided with a pinch roll group which can clamp the edge of the film sheet; the pinch roll set comprises an upper pinch roll 2, an upper pinch roll bracket 3, an upper air cylinder fixing bracket 4, a rotary upper air cylinder 5, an upper pinch roll base 6, an electromagnetic valve 8, an air pipe 9, a rotary lower air cylinder 10, a lower pinch roll 11, a lower pinch roll bracket 12, a lower pinch roll base 13 and a lower air cylinder fixing bracket 14; the upper clamping roller 2 is arranged on the rotary upper cylinder 5 through the upper clamping roller bracket 3; the rotary upper cylinder 5 is arranged on the upper clamping roller base 6 through the upper cylinder fixing support 4, and the upper clamping roller base 6 is arranged above the chain clamp rail 7; the lower clamping roller 11 is arranged on the rotary lower cylinder 10 through the lower clamping roller bracket 12; the rotary lower air cylinder 10 is mounted on the lower clamping roller base 13 through the lower air cylinder fixing support 14, and the lower clamping roller base 13 is mounted below the chain clamp rail 7;

the rotary upper cylinder 5 and the rotary lower cylinder 10 are connected with the electromagnetic valve 8 through the air pipe 9, and simultaneously act under the action of the electromagnetic valve 8, and a clamping space of the film is formed through the upper clamping roller 2 and the lower clamping roller 11. Go up the pinch roll 2 and adopt rubber materials, lower pinch roll 11 adopts metal material to the metal material surface of pinch roll 11 adopts the sculpture to handle down, utilizes rubber products to have the characteristics of certain deflection under the effect of pressure firstly, and the sculpture of lower pinch roll 11 effectively increases the coefficient of friction with film 1 simultaneously, makes the face of film centre gripping more fasten and be difficult to the pine take off. The length of the upper nip roller 2 and the length of the lower nip roller 11 are both 100 mm.

In the process of preparing a low shrinkage film, when the film 1 enters the N3 zone of the draw box, the cutter elevating part is raised, and the draw inner cutter cuts the film, thereby releasing the chain gripper from stretching the film in the transverse direction. The edge part (i.e. the finished sheet edge) of the film 1 is remained to be clamped by the clamping roller, the film losing the dragging force of the chain clamp cannot be dug to the middle due to the action of the clamping force of the clamping roller, and the film 1 is flattened and firmly clamped by the clamping roller in the cooling 1 area and the cooling 2 area, so that the longitudinal shrinkage performance of the film is changed. And finally, rolling the film 1 to obtain a finished film 1.

Example two

As shown in fig. 1 and 2, different from the first embodiment, in order to ensure the safety of personnel and equipment on the production line, the production safety line is provided with a membrane rupture signal and is connected in parallel with the electromagnetic valve 8, the electromagnetic valve immediately acts to realize the timely opening of the clamping roller under the condition of accidental membrane rupture, and the film processing devices are all in a non-working position state to prevent the membrane from damaging personnel and equipment on the production line.

EXAMPLE III

By figure 1, figure 2 and figure 6, different with embodiment one and embodiment two, go up cylinder fixed bolster 4 and lower cylinder fixed bolster 14 and equally divide and do not be equipped with two sets of parallel but highly different screw holes 41 and 42, straight waist type groove structure is all designed into to screw

hole

41 and 42, the central line in straight waist type groove all is mutually perpendicular with film 1, the upper and lower both ends in straight waist type groove all with the semicircle end-capping tangent with the groove limit, the width in straight waist type groove with the diameter of semicircle is the same, every distance between the centre of a circle of semicircle is 50mm about the waist type groove, the width in waist type groove is 11 mm. The mounting height of the air cylinder is adjusted according to the clamping force requirement of the clamping roller so as to achieve the desired clamping force and ensure that the clamping force of the film is not loosened.

Example four

By figure 1, figure 2 and figure 5 give, different with preceding three embodiment, go up clamp roll support 3 with all be equipped with the screw hole 31 of arc waist type groove structure and the screw hole 32 of centre of a circle groove structure on the clamp roll support 12 down, the central line of the screw hole 31 of arc waist type groove structure is for using the central point of the screw hole 32 of centre of a circle groove structure is the circular arc of centre of a circle, the both ends of the screw hole 31 of arc waist type groove structure with the same radial circular arc of the screw hole 32 of centre of a circle groove structure end, the trough rim of the screw hole 31 of arc waist type groove structure with the circular arc is tangent, the diameter of the screw hole 32 of centre of a circle groove structure is 11mm, the radius of the screw hole 31 central line of arc waist type groove structure is 30 mm.

The embodiment can be used for obtaining better longitudinal thermal shrinkage rate by inputting a small amount of cost on the production line of the existing fixed chain clamp spacing.

Table 1:

the table shows that the longitudinal heat shrinkage rate of the product produced by the shrinkage chain clamp device is well improved after the implementation of the invention, and the product is better than products produced by the shrinkage chain clamp device in the industry.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A film processing device comprises a transverse pulling box and a transverse pulling unit, wherein the transverse pulling unit is positioned in the transverse pulling box and comprises two chain clamp rails (7) and parallel transverse pulling chains (19) which are installed on the chain clamp rails (7) and rotate endlessly; characterized in that, the horizontal pulling unit includes: the transverse pulling clamping roller unit and the transverse pulling cutter unit are arranged in the transverse pulling box; the transverse drawing box comprises an N3 area, a cooling 1 area and a cooling 2 area in the transverse drawing box, wherein the N3 area, the cooling 1 area and the cooling 2 area are sequentially arranged along the drawing direction of the film (1);

the transverse pulling and clamping roller unit comprises at least two sets of clamping roller sets; the at least two sets of nip roll components are arranged in the cooling 1 area and the cooling 2 area; each set of the clamping roller group realizes clamping of two sides of the film (1) in the width direction;

the transverse drawing cutter unit and the transverse drawing clamping roller unit are sequentially arranged along the drawing direction of the film (1), and the transverse drawing cutter unit is arranged in the N3 area and used for cutting the edges of the film (1).

2. A film processing apparatus according to claim 1, wherein said cross-draw cutter unit comprises a cross-draw inner cutter (15), a cutter holder (16), a cutter lifting means (17) and a control member (18); the transverse pulling internal cutter (15) is positioned on the cutter support (16) and fixed on the cutter lifting component (17) along with the cutter support (16), and the control element (18) is used for adjusting the height of the cutter lifting component (17).

3. A thin film processing apparatus according to claim 1, wherein: the roller clamping set comprises an upper clamping roller (2), an upper clamping roller bracket (3), an upper air cylinder fixing bracket (4), a rotary upper air cylinder (5), an upper clamping roller base (6), an electromagnetic valve (8), an air pipe (9), a rotary lower air cylinder (10), a lower clamping roller (11), a lower clamping roller bracket (12), a lower clamping roller base (13) and a lower air cylinder fixing bracket (14); the upper clamping roller (2) is arranged on the rotary upper cylinder (5) through the upper clamping roller bracket (3); the rotary upper cylinder (5) is mounted on the upper clamping roller base (6) through the upper cylinder fixing support (4), and the upper clamping roller base (6) is mounted above the chain clamp rail (7); the lower clamping roller (11) is arranged on the rotary lower cylinder (10) through the lower clamping roller bracket (12); the rotary lower cylinder (10) is mounted on the lower clamping roller base (13) through the lower cylinder fixing support (14), and the lower clamping roller base (13) is mounted below the chain clamp rail (7);

the rotary upper air cylinder (5) and the rotary lower air cylinder (10) are connected with the electromagnetic valve (8) through the air pipe (9), and simultaneously act under the action of the electromagnetic valve (8), and a clamping space of a film is formed through the upper clamping roller (2) and the lower clamping roller (11).

4. A thin film processing apparatus according to claim 3, wherein: the upper clamping roller (2) is made of rubber; the material of the lower nip roller (11) is metal.

5. A thin film processing apparatus according to claim 3, wherein: go up clamp roll support (3) with all be equipped with screw hole (31) of arc waist type groove structure and screw hole (32) of centre of a circle groove structure on clamp roll support (12) down, the central line of screw hole (31) of arc waist type groove structure is for with the central point of screw hole (32) of centre of a circle groove structure is the circular arc of the centre of a circle, the both ends of screw hole (31) of arc waist type groove structure with the same radial circular arc of screw hole (32) of centre of a circle groove structure end, the trough rim of screw hole (31) of arc waist type groove structure with the circular arc is tangent.

6. A film processing apparatus according to claim 3, wherein the upper cylinder fixing support (4) and the lower cylinder fixing support (14) are respectively provided with two sets of parallel screw holes (41) and screw holes (42) having different heights, the screw holes (41) and the screw holes (42) are designed to be straight waist-shaped grooves, the central lines of the straight waist-shaped grooves are perpendicular to the film (1), the upper and lower ends of the straight waist-shaped grooves are terminated with semicircular arcs tangent to the groove edges, and the width of the straight waist-shaped grooves is the same as the diameter of the semicircular arcs.

7. A film processing apparatus according to claim 3, wherein said upper nip roll (2) or said lower nip roll (11) has a length of 80mm to 120 mm.

8. A thin film processing method based on the thin film processing apparatus as claimed in any one of claims 3 to 7, characterized by comprising the steps of:

step 1, when a low-shrinkage film is stretched to pass through the transverse-pulling cutter unit, lifting the cutter lifting component to complete lifting of the cutter inside the transverse-pulling from a non-working position to a working position, and cutting the edges of the film (1);

step 2, starting the electromagnetic valve (8) to enable the rotary upper cylinders (5) and the rotary lower cylinders (10) of the two sets of the clamping roller sets to rotate simultaneously to finish the action of clamping the film (1);

step 3, after the step 2 is finished, the sheet edge of the film (1) is clamped and taken away by a transverse zipper clamp arranged on the transverse zipper, the sheet edge of the film (1) is clamped by the upper clamping roller (2) and the lower clamping roller (11), and the film (1) is flattened;

and 4, step 4: and (4) rolling the film (1) obtained in the step (3) to obtain a finished film (1).