Direct forming device for ultra-thin plastic film

Abstract

The invention discloses a direct forming device for an ultra-thin plastic film, which comprises a casting main roller consisting of a plurality of arc-shaped roller surfaces, and each arc-shaped roller surface is connected with a variable-diameter driving part; the rotating shaft is arranged on the axis of the casting main roller, and the variable-diameter driving part is connected with the rotating shaft; the circumferential rotation period of the casting main roller comprises a first semicircular period and a second semicircular period; the variable-diameter driving part in the second semi-circle period drives the arc-shaped roller surface to move away from the rotating shaft to the set maximum radius position and then to the linear displacement action of the initial radius position; the discharging end of the cast film die head assembly is arranged on the arc-shaped roller surface in the first semi-circle period; the temperature controller is arranged in the arc-shaped roller surface; and the cooling roller is in contact with the plastic film on the arc-shaped roller surface to cool and form the plastic film, and the formed plastic film is wound out of the cooling roller. According to the invention, the plastic film extruded by the film die head of the casting machine is stretched again by constructing the variable-diameter casting roller, so that the plastic film with thinner thickness can be prepared.

Description

Technical Field

[0001] The invention relates to the technical field of plastic film preparation, and in particular to a direct forming device for an ultra-thin plastic film. Background Art

[0002] Cast film machine refers to special equipment used to make cast film. The cast film production line mainly consists of five parts: extrusion part, casting part, corona part, winding part, and electronic control part. The thickness of the plastic film prepared by the cast film machine is mainly controlled by the extrusion port size of the film die of the cast film machine. In the production process of cast film, a cast film machine is needed for molding, but the existing cast film machine generally uses one film head for extrusion casting. When the extrusion and film head casting are temporarily not smooth, the cast film will have uneven coating. Therefore, the thickness of the cast film after molding will deviate, and the production quality will be unstable, affecting the production quality. As the target plastic film thickness increases, that is, the extrusion size of the film die of the cast film machine increases, the above-mentioned extrusion unsmoothness and uneven coating will decrease.

[0003] Therefore, the existing casting mechanism is not effective or the thickness of the one-time molding is lower than that of the general plastic film, and secondary processing is required. Summary of the invention

[0004] The purpose of the present invention is to provide a direct forming device for ultra-thin plastic films to solve the technical problem in the prior art that secondary processing is required because the existing casting mechanism is not effective or the thickness of the prepared film formed in one time is lower than that of general plastic films.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] A direct forming device for ultra-thin plastic film, a casting main roller, a plurality of arc-shaped roller surfaces forming the casting main roller, each of the arc-shaped roller surfaces is connected to an independently controlled variable diameter driving part;

[0007] A rotating shaft is arranged on the axis of the main casting roller, and a plurality of the variable diameter driving parts are evenly distributed on the circumferential surface of the rotating shaft;

[0008] The circumferential rotation period of the main casting roller includes a first semicircular period and a second semicircular period, and the rotating shaft drives the arc-shaped roller surface to rotate circumferentially at a uniform speed in the first semicircular period and the second semicircular period;

[0009] The variable diameter driving part does not drive the arc-shaped roller surface to radially displace within the first semicircular period;

[0010] The variable diameter driving unit drives the arc-shaped roller surface to move away from the rotation axis to a set maximum radius position and then returns to an initial radius position in the second semicircular period;

[0011] Disposing the discharge end of the cast film die assembly on the arc-shaped roller surface within the first semicircular period;

[0012] A temperature controller is arranged inside the arc-shaped roller surface and is used to heat the arc-shaped roller surface to a set temperature;

[0013] The cooling roller is arranged in the second semicircular period, and the diameter-changing driving part drives the arc roller surface to return to the initial radius position, contacts the plastic film on the arc roller surface to cool the plastic film, and the formed plastic film is wound out from the cooling roller.

[0014] As a preferred solution of the present invention, it also includes a casting sub-roller, which is arranged on the side of the casting film die head close to the second half period and contacts the plastic film on the arc-shaped roller surface of the casting main roller.

[0015] As a preferred solution of the present invention, the variable diameter driving part includes hydraulic cylinders arranged on both sides of the arc-shaped roller surface, and the piston ends of the hydraulic cylinders are connected to the back side of the arc-shaped roller surface through a V-shaped frame.

[0016] As a preferred solution of the present invention, both sides of the casting main roller located at the second semicircular period have edge pressing components;

[0017] The edge pressing assembly includes a plurality of elastic rods, which are evenly distributed on the moving trajectory of the arc roller surface within the second semicircular period. The elastic rods are rotatably connected to the end of the arc roller surface with a pressing wheel, and the pressing wheel is always in contact with the side edge of the plastic film on the arc roller surface at the corresponding position with the cooperation of the elastic rods.

[0018] As a preferred solution of the present invention, a plurality of the elastic rods are evenly arranged on an arc-shaped bracket, and the shape of the arc-shaped bracket is the same as the trajectory of the arc-shaped roller surface moving in the second semicircular period;

[0019] The elastic rod comprises a tube seat mounted on the arc-shaped bracket, a guide rod is movably connected in the tube seat, a mounting seat is arranged at the end of the guide rod away from the arc-shaped bracket, a spring is sleeved on the rod body of the guide rod between the mounting seat and the tube seat, and one end of the spring is fixedly connected to the tube seat;

[0020] The pressing wheel is rotatably mounted on the mounting seat via a core shaft, and a circumferential surface of the pressing wheel contacts the side surface of the plastic film.

[0021] As a preferred embodiment of the present invention, it also includes a cylindrical cover body, the main casting roller is arranged inside the cylindrical cover body, the cylindrical cover body is provided with an assembly groove for installing the casting film die head, the bottom of the cylindrical cover body is provided with a discharge slot, and the cooling roller is arranged in the discharge slot.

[0022] As a preferred solution of the present invention, the V-shaped frame includes an end seat connected to the piston end of the hydraulic cylinder, two first telescopic rods are connected to the end seat, and the other ends of the two first telescopic rods are respectively connected to the two sides of the end of the arc-shaped roller surface;

[0023] A second telescopic rod is connected to the middle of the inner side of the arc-shaped roller surface, and the other end of the second telescopic rod is connected to the rotating shaft;

[0024] Wherein, the angle of the arc-shaped roller surface is adjusted by the cooperation of the second telescopic rod and the two first telescopic rods.

[0025] As a preferred solution of the present invention, the outer surfaces of all arcuate roller surfaces within the second semicircular period are tangent to the surface of the plastic film on the arcuate roller surface.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention constructs a variable diameter casting roller to re-stretch the plastic film extruded by the film die of the casting machine, thereby realizing re-stretching and thickness adjustment based on the original plastic film that can extrude the target thickness, so that a plastic film with a thinner thickness can be prepared. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0029] Figure 1 is a cross-sectional schematic diagram of the overall structure of an embodiment of the present invention;

[0030] Figure 2 It is a structural schematic diagram of a certain arc-shaped roller surface cross section of an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of a connection structure of a second telescopic rod of a certain arc-shaped roller surface according to an embodiment of the present invention;

[0032] Figure 4It is a schematic diagram of the movement trajectory of a certain arc-shaped roller surface in the first half cycle and the second half cycle of an embodiment of the present invention.

[0033] The numbers in the figure represent the following:

[0034] 10-casting main roller; 11-arc roller surface; 20-variable drive unit; 21-hydraulic cylinder; 221-end seat; 222-first telescopic rod; 22-V-shaped frame; 23-second telescopic rod; 30-rotating shaft; 40-cooling roller; 50-casting auxiliary roller; 60-edge pressure assembly; 61-elastic rod; 62-pressure wheel; 63-arc bracket; 64-tube seat; 65-guide rod; 66-mounting seat; 67-spring; 68-core shaft; 70-cylindrical cover; 71-assembly groove; 72-discharging groove; 80-temperature controller; 81-heating plate; 82-cooling tube. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a direct forming device for ultra-thin plastic film, a casting main roller 10, a plurality of arc-shaped roller surfaces 11 constitute the casting main roller 10, and each arc-shaped roller surface is connected to an independently controlled variable diameter driving part 20;

[0037] The rotating shaft 30 is arranged on the axis of the main casting roller 10, and a plurality of variable diameter driving parts 20 are evenly distributed on the circumferential surface of the rotating shaft 30;

[0038] The circumferential rotation period of the casting main roller 10 includes a first semicircular period and a second semicircular period, and the rotating shaft 30 drives the arc-shaped roller surface 11 to rotate circumferentially at a uniform speed in the first semicircular period and the second semicircular period;

[0039] The variable diameter driving part 20 does not drive the arc-shaped roller surface 11 to radially displace in the first semicircular period;

[0040] In the second semicircular period, the variable diameter driving unit 20 drives the arc-shaped roller surface 11 to move away from the rotating shaft 30 to a set maximum radius position and then returns to the position of the initial radius in a linear displacement action;

[0041] The discharge end of the cast film die assembly is arranged on the arc-shaped roller surface 11 within the first semicircular period;

[0042] A temperature controller is arranged inside the arc-shaped roller surface 11 and is used to heat the arc-shaped roller surface 11 to a set temperature;

[0043] The cooling roller 40 is arranged in the second semicircular period. The variable diameter driving unit 20 drives the arc roller surface 11 to return to the initial radius position, contacts the plastic film on the arc roller surface 11 to cool the plastic film, and the formed plastic film is wound out from the cooling roller 40.

[0044] Unlike the main roller of the existing casting machine, the present invention stretches the plastic film extruded from the film die of the casting machine again by constructing a casting roller with a variable diameter, that is, the surface of the casting main roller 10 used for plastic film molding is divided into N arc surface units, that is, the arc roller surface 11 has a fan-shaped longitudinal section, and the arc roller surface 11 is driven by a radial driving unit to move away from (or approach) the roller axis of the casting main roller 10 under the circumferential rotation of the rotating shaft 30. These two actions are coupled. The moving away action of the arc roller surface 11 can stretch the existing plastic films on the two adjacent arc roller surfaces 11, so as to achieve further stretching and thinning of the pre-formed plastic film.

[0045] In the present invention, a temperature controller is provided, the purpose of which is to keep the film body cast from the film die head of the casting machine on the casting main roller 10 at a temperature at which it can continue to deform, rather than cooling and forming immediately, but in fact in a pre-forming state.

[0046] Since the plastic film is always in contact with the surface of the arc-shaped roller surface 11, the flatness of its surface can be maintained during the stretching process.

[0047] Further stretching and thickness adjustment can be performed on the basis of the original plastic film capable of being extruded to a target thickness, thereby being able to prepare a plastic film with a thinner thickness.

[0048] Furthermore, the present invention also includes a casting sub-roller 50, which is arranged on the side of the casting film die head close to the second half cycle and contacts the plastic film on the arc-shaped roller surface 11 of the casting main roller 10. Since the film body cast on the casting main roller 10 is in a pre-formed state, the contact between the casting main roller 10 and the casting sub-roller 50 can achieve a pre-formed plastic film with a target preset initial thickness.

[0049] Further, in order to more clearly illustrate the working principle of the above-mentioned variable diameter driving unit 20, the present invention provides a specific implementation of the variable diameter driving unit 20:

[0050] It comprises hydraulic cylinders 21 arranged on both sides of the arc-shaped roller surface 11 , and piston ends of the hydraulic cylinders 21 are connected to the back side of the arc-shaped roller surface 11 through a V-shaped frame 22 .

[0051] The main casting roller 10 is provided with edge pressing components 60 on both sides of the second semicircular period.

[0052] During the film stretching process, the molecular chains inside the film will be pulled by tension, and the surface of the film will tend to form a "Himalayas"-like undulation under the action of tension. The two ends of the plastic film will shrink in the width direction in the absence of force. In order to avoid this situation, the present invention provides edge holding assemblies 60 on the two end surfaces of the casting main roller 10 to apply radial force to the side edges of the plastic film during the stretching process, thereby avoiding wrinkles on the surface of the film.

[0053] Specifically, the edge pressing assembly 60 includes a plurality of elastic rods 61, which are evenly distributed along the moving trajectory of the arc roller surface 11 within the second semicircular period. The elastic rods 61 are rotatably connected to the end of the arc roller surface 11 and are connected to a pressing wheel 62. The pressing wheel 62 is always in contact with the side edge of the plastic film on the arc roller surface 11 at the corresponding position with the cooperation of the elastic rods 61.

[0054] A plurality of elastic rods 61 are evenly arranged on an arc-shaped bracket 63 , and the shape of the arc-shaped bracket 63 is the same as the trajectory of the arc-shaped roller surface 11 moving in the second semicircular period.

[0055] Furthermore, in order to more clearly illustrate the working mode of the above-mentioned elastic rod 61, the present invention provides a specific implementation method of the elastic rod 61, the elastic rod 61 includes a tube seat 64 installed on the arc-shaped bracket 63, a guide rod 65 is movably connected in the tube seat 64, and a mounting seat 66 is provided at the end of the guide rod 65 away from the arc-shaped bracket 63, and a spring 67 is mounted on the rod body of the guide rod 65 between the mounting seat 66 and the tube seat 64, and one end of the spring 67 is fixedly connected to the tube seat 64.

[0056] The pressing wheel 62 is rotatably mounted on the mounting seat 66 via a core shaft 68, and the circumferential surface of the pressing wheel 62 contacts the side surface of the plastic film.

[0057] Its main purpose is that, since the running trajectory of each arc-shaped roller surface 11 is a parabola, the pressure wheel 62 needs to press the side of the plastic film accordingly to ensure that it does not deform and remains flat during the stretching process. At the same time, when the diameter of the arc-shaped roller surface 11 increases under the drive of the variable diameter drive unit 20, a relative displacement exceeding a certain friction force must occur between the plastic film and the pressure wheel 62, so the pressure wheel 62 cannot completely press the surface of the plastic film.

[0058] To further illustrate, in the present invention, when the arc roller surface 11 rotates to the second semicircular period, the variable diameter driving unit 20 starts to drive the arc roller surface 11 away from the rotating shaft 30, and the circumferential rotation driven by the coupled rotating shaft 30 makes the moving trajectory of the arc roller surface 11 stretching the plastic film specifically a parabola.

[0059] Since the curvature of the arc-shaped roller surface 11 is fixed, the inner side of the plastic film on the arc-shaped roller surface 11 in the second semicircular period will not completely fit the surface of the arc-shaped roller surface 11. Therefore, in order for the stretched plastic film to have a complete surface structure, the plastic film in the second semicircular period needs to be in a state of continuous and constant pulling of the surface of the plastic film.

[0060] All the arcuate roller surfaces 11 in the second semicircular period must have a surface that can be tangent to the same parabola, that is, the outer surfaces of all the arcuate roller surfaces 11 in the second semicircular period are tangent to the surface of the plastic film on the arcuate roller surfaces 11.

[0061] For easier understanding, Figure 4 As shown, the complete rotation cycle of the casting main roller 10 is constructed into quadrants (rectangular coordinate system) with the center of the rotation axis 30 as the origin, the first semicircular cycle is located in the first quadrant and the fourth quadrant, and the second semicircular cycle is located in the second quadrant and the third quadrant. The intersection of the first semicircular cycle and the second semicircular cycle is located on the Y-axis (positive and negative directions), specifically represented as point A and point B.

[0062] In the second cycle, since the variable diameter driving unit 20 in the second semicircular cycle drives the arc roller surface 11 to move away from the rotating axis 30 to the set maximum radius position and then restores to the initial radius position for linear displacement, it can be disassembled into the process in which the variable diameter driving unit 20 drives the arc roller surface 11 to move away from the rotating axis 30 to the set maximum radius position is located in the second quadrant, and the process in which it restores to the initial radius position is located in the third quadrant.

[0063] The variable diameter driving unit 20 drives the arc roller surface 11 to be located at the farthest point from the rotating shaft 30 on the X-axis (negative direction), and by knowing the coordinates of points A, B, and C, a parabola tangent to all the arc roller surfaces 11 in the second period (i.e., the moving trajectory of the arc roller surface 11) can be constructed, so that the plastic film on the arc roller surface 11 in the second period is in uniform contact with the surface of each arc roller surface 11.

[0064] Of course, when the main casting roller 10 is decomposed into multiple arc-shaped roller surfaces 11, the smaller the curvature of the arc-shaped roller surface 11, the greater the surface force exerted on the plastic film when it is driven by the variable diameter drive unit 20. The design of the curvature of the arc-shaped roller surface 11 needs to take into account the width and thickness of the molded plastic film.

[0065] Furthermore, in order to enable the plastic film in the second semicircular period to be in a state of continuous and constant pulling of the surface of the plastic film, and to prevent the edge of the arc-shaped roller surface 11 from contacting the inner surface of the plastic film during the circumferential rotation, the angle of the arc-shaped roller surface 11 is dynamically adjusted in the present invention so that the plastic film is always in contact with the smooth surface of the arc-shaped roller surface 11.

[0066] To this end, the V-shaped frame 22 in the present invention includes an end seat 221 connected to the piston end of the hydraulic cylinder 21, and two first telescopic rods 222 are connected to the end seat 221, and the other ends of the two first telescopic rods 222 are respectively connected to the two sides of the end of the arc roller surface 11, wherein the connection between the action end of the first telescopic rod 222 and the arc roller surface 11 is a rotatable connection, and the fixed end of the first telescopic rod 222 and the end seat 221 are also rotatably connected.

[0067] When specifically adjusting the angle of the arc roller surface 11, the hydraulic cylinder 21 is used to drive the arc roller surface 11 to move away from the rotating shaft 30, that is, the change in radius when the arc roller surface 11 rotates circumferentially, and the angle change of the arc roller surface 11 can be completed by extending one of the two first telescopic rods 222 and contracting the other.

[0068] In the actual design process, since the piston rod of the hydraulic cylinder 21 needs to bear the gravity of itself and the arc-shaped roller surface 11, it is obvious that there is an instability problem during the circumferential rotation.

[0069] For this purpose, the present invention provides a second telescopic rod 23, the middle of the inner side of the arc roller surface 11 is connected with the second telescopic rod 23, and the other end of the second telescopic rod 23 is connected to the rotating shaft 30. The movable end of the second telescopic rod 23 is rotatably connected to the middle of the inner surface of the arc roller surface 11, and the fixed end thereof is movably connected to the rotating shaft 30.

[0070] The angle of the arc-shaped roller surface 11 is adjusted by the cooperation of the second telescopic rod 23 and the two first telescopic rods 222 . Specifically, the second telescopic rod 23 is actively driven, and the first telescopic rods 222 are cooperatively driven.

[0071] From the longitudinal section, a triangular structure can be formed between the first telescopic rod 222, the second telescopic rod 23 and the arc-shaped roller surface 11, and the first telescopic rod 222 and the second telescopic rod 23 respectively form two sides of the triangle. The change in the length of the two sides will drive the angle of the arc-shaped roller surface 11 to change, thereby adjusting the angle of the arc-shaped roller surface 11.

[0072] Of course, the present invention sets the first telescopic rod 222 and the second telescopic rod 23 based on the most direct solution to achieve angle adjustment of the arc roller surface 11. In the actual design process, it is also possible to consider driving through a connecting rod assembly to optimize the driving method of the angle adjustment of the arc roller surface 11.

[0073] Furthermore, the present invention is different from the existing method of preparing films by a cast-film machine in that the purpose of the main roller of the existing cast-film machine is mainly to cool and shape the film material extruded by the film die of the cast-film machine, while the present invention needs to stretch the film material based on the film die of the cast-film machine again. Therefore, it is necessary to ensure that the plastic film is in a stretchable temperature environment during the stretching process to ensure the stability of its stretched state.

[0074] To this end, the present invention also includes a cylindrical cover body 70, or a tubular structure, and the main casting roller 10 is arranged as a whole in the cylindrical cover body 70. Then, the heat generated by the temperature controller in the arc roller surface 11 will be filled in the interior of the cylindrical cover body 70, thereby ensuring that the plastic film in the stretched state obtains a good temperature environment and can avoid the influence of the outside world on the stretching of the plastic film in the second cycle.

[0075] In order to obtain an ideal stretching environment for the plastic film in the present invention, the main casting roller 10 can be set inside the cylindrical cover 70. Of course, it is not completely covered. The range that needs to be covered mainly includes the part of the main casting roller 10 related to stretching the plastic film. Of course, in actual design, there is no need to make clear requirements on its shape. It is only necessary to cover the part of the casting main pipe 10 used for stretching so that the plastic film can obtain a stable temperature environment in this part, and it is also convenient to quickly realize the temperature change of the main casting roller 10 in this part.

[0076] In the present invention, an assembly groove 71 for installing the cast film die head is provided on the cylindrical cover body 70, that is, an opening is provided on the cylindrical cover body 70, and baffles along the radial direction of the cylindrical cover body 70 are connected on both sides of the opening, and an assembly groove 71 for assembling the cast film die head is formed between the two baffles.

[0077] In the design of the discharge point of the plastic film, a discharge slot 72 is provided at the bottom of the cylindrical cover 70 , and the cooling roller 40 is disposed in the discharge slot 72 . The stretched plastic film passes through the cooling roller 40 and is transported out from the discharge slot 72 .

[0078] It is further explained that the purpose of the arcuate roller surface 11 in the second quadrant is to stretch the plastic film, while the arcuate roller surface 11 in the third quadrant is used to maintain the shape of the stretched film.

[0079] Therefore, the temperature controller 80 starts to gradually reduce the temperature of the arc-shaped roller surface 11 when the arc-shaped roller surface 11 rotates to the third quadrant, until the arc-shaped roller surface 11 reaches the cooling temperature for plastic film molding.

[0080] The temperature controller 80 in the present invention mainly includes a heating plate 81 arranged inside the arc roller surface 11, a cooling pipe 82 is arranged between the heating plate and the surface of the arc roller surface 11, and the heating plate is connected to a temperature control system. Specifically, an existing temperature control system can be adopted, and the present invention will not explain it in detail.

[0081] Since the arc-shaped roller surface 11 is always in the process of circumferential rotation, the water pipe in the arc-shaped roller surface 11 can be connected to an external water supply device by providing a liquid water slip ring.

[0082] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A direct forming device for ultra-thin plastic film, characterized in that: include: A main casting roller (10), wherein a plurality of arcuate roller surfaces (11) constitute the main casting roller (10), and each of the arcuate roller surfaces is connected to an independently controlled variable diameter driving unit (20); A rotating shaft (30) is arranged on the axis of the main casting roller (10), and a plurality of the variable diameter driving parts (20) are evenly distributed on the circumferential surface of the rotating shaft (30); The circumferential rotation period of the main casting roller (10) includes a first semicircular period and a second semicircular period, and the rotating shaft (30) drives the arc-shaped roller surface (11) to rotate circumferentially at a uniform speed within the first semicircular period and the second semicircular period; The variable diameter driving part (20) does not drive the arc-shaped roller surface (11) to cause radial displacement within the first semicircular period; The variable diameter driving unit (20) drives the arc-shaped roller surface (11) to move away from the rotating shaft (30) to a set maximum radius position and then returns to an initial radius position in the second semicircular period to perform a linear displacement action; The discharge end of the cast film die assembly is arranged on the arc-shaped roller surface (11) within the first semicircular period; A temperature controller (80) is arranged inside the arc-shaped roller surface (11) and is used to heat the arc-shaped roller surface (11) to a set temperature; The cooling roller (40) is arranged in the second semicircular period, and the diameter-changing driving part (20) drives the arc-shaped roller surface (11) to return to the initial radius position, contacts the plastic film on the arc-shaped roller surface (11) to cool the plastic film, and the formed plastic film is wound out from the cooling roller (40).

2. The device for directly forming an ultra-thin plastic film according to claim 1, characterized in that: It also includes a casting auxiliary roller (50), which is arranged on the side of the casting film die head close to the second half period and contacts the plastic film on the arc-shaped roller surface (11) of the casting main roller (10).

3. The device for directly forming an ultra-thin plastic film according to claim 1, characterized in that: The variable diameter driving part (20) comprises hydraulic cylinders (21) arranged on both sides of the arc-shaped roller surface (11), and the piston ends of the hydraulic cylinders (21) are connected to the back side of the arc-shaped roller surface (11) through a V-shaped frame (22).

4. The device for directly forming an ultra-thin plastic film according to claim 1, characterized in that: Edge pressing components (60) on both sides of the casting main roller (10) located in the second semicircular period; The edge pressing assembly (60) comprises a plurality of elastic rods (61), and the plurality of elastic rods (61) are evenly distributed on a moving trajectory of the arc roller surface (11) within the second semicircular period. The elastic rods (61) are rotatably connected to the end of the arc roller surface (11) and are provided with a pressing wheel (62). The pressing wheel (62) is always in contact with the side edge of the plastic film on the arc roller surface (11) at a corresponding position in cooperation with the elastic rods (61).

5. The device for directly forming an ultra-thin plastic film according to claim 4, characterized in that: The plurality of elastic rods (61) are evenly arranged on an arc-shaped bracket (63), and the shape of the arc-shaped bracket (63) is the same as the trajectory of movement of the arc-shaped roller surface (11) in the second semicircular period; The elastic rod (61) comprises a tube seat (64) mounted on the arc-shaped bracket (63), a guide rod (65) is movably connected inside the tube seat (64), a mounting seat (66) is provided at the end of the guide rod (65) away from the arc-shaped bracket (63), a spring (67) is sleeved on the rod body of the guide rod (65) between the mounting seat (66) and the tube seat (64), and one end of the spring (67) is fixedly connected to the tube seat (64).

6. The device for directly forming an ultra-thin plastic film according to claim 5, characterized in that: The pressing wheel (62) is rotatably mounted on the mounting seat (66) via a core shaft (68), and the circumferential surface of the pressing wheel (62) contacts the side surface of the plastic film.

7. The device for directly forming an ultra-thin plastic film according to claim 1, characterized in that: It also includes a cylindrical cover body (70), the main casting roller (10) is arranged inside the cylindrical cover body (70), the cylindrical cover body (70) is provided with an assembly groove (71) for installing the casting film die head, the bottom of the cylindrical cover body (70) is provided with a discharge groove (72), and the cooling roller (40) is arranged in the discharge groove (72).

8. The device for directly forming an ultra-thin plastic film according to claim 3, characterized in that: The V-shaped frame (22) comprises an end seat (221) connected to the piston end of the hydraulic cylinder (21), two first telescopic rods (222) are connected to the end seat (221), and the other ends of the two first telescopic rods (222) are respectively connected to the two sides of the end of the arc-shaped roller surface (11); A second telescopic rod (23) is connected to the middle of the inner side of the arc-shaped roller surface (11), and the other end of the second telescopic rod (23) is connected to the rotating shaft (30).

9. The device for directly forming an ultra-thin plastic film according to claim 8, characterized in that: The angle of the arc-shaped roller surface (11) is adjusted by the cooperation of the second telescopic rod (23) and the two first telescopic rods (222).

10. The device for directly forming an ultra-thin plastic film according to claim 1, characterized in that: The outer surfaces of all the arcuate roller surfaces (11) within the second semicircular period are in a tangent relationship with the surface of the plastic film on the arcuate roller surface (11).

Images