A low-permeability film casting production equipment and process

Abstract

The invention relates to the field of cast film forming, and discloses a low-permeability film cast forming production equipment and process, including cast film forming rollers, slide rails, tensioning rollers and winding rollers. The cast film forming rollers are symmetrically arranged, and a cast film head is provided on the cast film forming rollers. During the cast film forming process, the raw material discharged by the cast film head forms a cast film under the action of the cast film forming rollers. After passing through the tensioning rollers in sequence, the cast film reaches a grabbing mechanism. The squeezing rollers in the grabbing mechanism are symmetrically arranged in an outer shell. The cast film passes through a channel between the two squeezing rollers. When the cast film enters the channel, the squeezing rollers slightly squeeze the cast film through their symmetrical structure and appropriate spacing, so that the cast film remains flat and has uniform tension when passing through. A shearing component is arranged close to the channel. When the cast film needs to be cut, the shearing component is started to accurately shear the cast film, thereby forming an automated processing procedure for the cast film and avoiding contamination of the cast film during the processing.

Description

Technical Field

[0001] The invention relates to the field of cast film forming, in particular to a low-air-permeability film cast film forming production device and process. Background Art

[0002] Cast film is a non-stretched, non-directional flat extruded film produced by quenching a melt stream. It has excellent heat-sealing properties and excellent transparency, making it a key composite packaging substrate. It has a promising market prospect for applications such as high-temperature retort film and vacuum aluminized film.

[0003] The existing cast film needs to continuously adjust the molding thickness of the cast film during each cold casting molding, so that at the beginning of the cast film molding, the spacing between the molding rollers needs to be adjusted, which will make the surface of the cast film uneven. It is necessary to manually cut off this part of the cast film and adjust the spacing between the molding rollers before a cast film that meets the standards can be produced. The manual cutting process will leave traces such as fingerprints, dust, hair debris, etc. on the surface of the cast film. Therefore, the operator's working environment needs to be repeatedly confirmed before operation, and the cast film surface needs to be avoided from being repeatedly contaminated. Such an operation process is really inconvenient, so there is a need for a molding production equipment that can reduce human contact during cast film molding. Summary of the Invention

[0004] The present invention provides a low-permeability film tape casting production device and process, which overcomes the shortcomings described in the background technology.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A low-permeability film cast molding production equipment includes a cast molding roller, a slide rail, a tensioning roller and a winding roller, the cast molding rollers are symmetrically arranged, the cast molding rollers are provided with a cast head, the tensioning rollers are arranged in sequence between the cast molding rollers and the winding roller, each tensioning roller is driven up and down by a wire rod transmission mechanism, so that the raw material discharged from the cast head is formed into a cast film through the symmetrically arranged cast molding rollers, and the cast film is wound around the winding roller after passing through each tensioning roller in sequence, the slide rail is located below the tensioning roller, a driving slide is slidably installed on the slide rail, and an electric push rod is provided on the driving slide, and a gripping mechanism is provided on the output shaft of the electric push rod, the gripping mechanism includes an outer shell, an extrusion roller and a shearing assembly, the extrusion rollers are symmetrically arranged in the outer shell, a channel for the cast film to pass through is provided between the two extrusion rollers, the shearing assembly is arranged close to the channel, and the cast film is sheared by the shearing assembly;

[0007] A driving mechanism is provided on the side of the outer shell, which is fixed to the output shaft of the electric push rod through a fixing seat, and the driving mechanism includes a motor 1 and a motor 2. The motor 1 is fixed to the surface of the fixing seat through a fixing bracket. One end of the outer shell is rotatably connected to the fixing seat, and the other end is connected to the output shaft of the motor 1, so that the outer shell can be adjusted to swing through the motor 1.

[0008] Both extrusion rollers are driven to rotate by motor 2, and gear 1 is installed on the output shaft of motor 2. Gear 2 is provided on the side of both extrusion rollers close to gear 1. Gear 1 is engaged with one of gears 2, and gear 1 is engaged with the other gear 2 through gear 3, so that the two extrusion rollers are driven to rotate in opposite directions by motor 2, and an adjusting device for adjusting the outer diameter of the extrusion roller is provided in the extrusion roller, so that the outer diameter of the corresponding extrusion roller can be adjusted respectively through the two adjusting devices, thereby adjusting the thickness of the channel.

[0009] In a preferred technical solution, a negative pressure flow channel is provided in the outer shell, and the rotor air compressor is connected to the negative pressure flow channel through a connecting pipe. The two ends of the negative pressure flow channel extend to the side of the outer shell away from the shear assembly, and the two ends of the negative pressure flow channel are arranged toward each other.

[0010] The squeezing roller is provided with a connecting shaft at one end away from the gear 2, and the connecting shaft extends outside the outer shell, and a gas channel extending in a spiral shape is provided in the squeezing roller, and the gas channel is connected to the connecting shaft. The gas channel extends outward to the surface of the squeezing roller through multiple discharge ports, and mounting grooves are provided at the surface of the squeezing roller corresponding to each discharge port. An expansion airbag is installed in each mounting groove, and the expansion airbag is inserted into the discharge port through a connecting short tube and is connected to the gas channel. A rotor air compressor is provided on the lower side of the squeezing roller, and the output end and input end of the rotor air compressor are respectively connected to the negative pressure flow channel and the connecting shaft through a connecting pipe, so that the air in the negative pressure flow channel is drawn into the gas channel through the rotor air compressor, and all the expansion airbags on the surface of the squeezing roller are inflated;

[0011] The rotor air compressor, the gas channel, the expansion airbag and the connecting shaft constitute the regulating device.

[0012] A preferred technical solution, the shearing assembly includes shear blade 1, shear blade 2 and a driving cylinder, shear blade 1 and shear blade 2 are arranged facing each other, and shear blade 1 and shear blade 2 are respectively driven by the driving cylinders arranged on the surface of the outer shell, and when shear blade 1 and shear blade 2 are close to each other, they shear the cast film passing through the middle of the channel.

[0013] A low-permeability film cast molding process is applied to the low-permeability film cast molding production equipment described above. The corresponding tensioning rollers need to be adjusted through all screw transmission mechanisms so that two adjacent tensioning rollers are respectively located at the extreme ends of the upper and lower sides. The cast film raw material is then discharged downward through the cast head. The cast film is extruded and formed using symmetrically arranged cast molding rollers, and the cast film is allowed to fall naturally. Subsequently, an electric push rod is used to drive a gripping mechanism to move upward to the end of the cast film. The outer shell is rotated by motor 1 so that the channel between the two extrusion rollers is oriented towards and close to the cast film. When the cast film passes through the channel, a rotor air compressor is used to generate negative pressure at both ends of the negative pressure flow channel, and an expansion airbag is expanded outward to squeeze and fix the cast film. The two extrusion rollers are driven by motor 2 to push the cast film on their surface 30 cm toward the shearing assembly.

[0014] The cast film is then cut by the shearing assembly, and the grabbing mechanism is moved by an electric push rod and passed through all the tensioning rollers. The end of the cast film is moved to the upper right side of the winding roller, and the cast film is covered on the surface of the winding roller and wound by the winding roller.

[0015] Compared with the existing technology, this technical solution has the following advantages:

[0016] During the cast film forming process, the raw material discharged from the cast head forms a cast film under the action of the cast forming roller. The cast film passes through the tensioning roller in turn and reaches the grabbing mechanism. The squeezing rollers in the grabbing mechanism are symmetrically arranged in the outer shell. The cast film passes through the channel between the two squeezing rollers. When the cast film enters the channel, the squeezing rollers use their symmetrical structure and appropriate spacing to slightly squeeze the cast film, so that the cast film remains flat and the tension is uniform when passing through. The shearing component is set close to the channel. When the cast film needs to be cut, the shearing component is started to accurately cut the cast film, thereby forming an automated processing procedure for the cast film and avoiding contamination of the cast film during the processing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and examples.

[0018] Figure 1 This is an overall diagram of the present invention.

[0019] Figure 2 Schematic diagram of the grasping mechanism.

[0020] Figure 3 A schematic diagram of the gripping mechanism from another perspective.

[0021] Figure 4 It is a structural diagram of the squeezing roller and the driving mechanism.

[0022] Figure 5 It is a structural diagram of the negative pressure flow channel and the rotor air compressor.

[0023] Figure 6 Schematic diagram of the squeeze roller.

[0024] Figure 7 Schematic diagram of the exploded view of the squeeze roller.

[0025] Figure 8 It is a structural diagram of the installation slot and the expansion airbag.

[0026] In the figure: casting head 1, casting forming roller 2, grabbing mechanism 3, slide rail 4, tensioning roller 5, screw transmission mechanism 6, winding roller 7;

[0027] Outer shell 31, squeezing roller 32, fixing bracket 33, driving mechanism 34, fixing seat 35, shearing assembly 36, rotor air compressor 37;

[0028] negative pressure flow channel 311;

[0029] Gas channel 321, mounting groove 322, exhaust port 3211, expansion air bag 323, connecting short tube 3231, connecting shaft 324;

[0030] Motor 1 341, motor 2 342, gear 1 3421, gear 2 343, gear 3 344;

[0031] Shear blade 1 361, shear blade 2 362, driving cylinder 363;

[0032] Connecting pipe 371. DETAILED DESCRIPTION

[0033] like Figures 1 to 8 As shown, the present invention proposes a low-permeability film casting production equipment, including a casting forming roller 2, a slide rail 4, a tensioning roller 5 and a winding roller 7. The casting forming roller 2 is symmetrically arranged, and a casting head 1 is provided on the casting forming roller 2. The tensioning rollers 5 are arranged in sequence between the casting forming roller 2 and the winding roller 7. Each tensioning roller 5 is driven to rise and fall by a wire rod transmission mechanism 6 to form the raw material discharged from the casting head 1 into a casting film through the symmetrically arranged casting forming rollers 2, and the casting film is allowed to pass through each tensioning roller 5 in sequence. Afterwards, it is wound on the winding roller 7. The slide rail 4 is located below the tensioning roller 5. A driving slide 41 is slidably installed on the slide rail 4. The driving slide 41 is provided with an electric push rod 42. The output shaft of the electric push rod 42 is provided with a grabbing mechanism 3. The grabbing mechanism 3 includes an outer shell 31, squeezing rollers 32 and a shearing assembly 36. The squeezing rollers 32 are symmetrically arranged in the outer shell 31. There is a channel between the two squeezing rollers 32 for the cast film to pass through. The shearing assembly 36 is arranged close to the channel, and the cast film is sheared by the shearing assembly 36.

[0034] During the cast film forming process, the raw material discharged from the cast head 1 forms a cast film under the action of the cast forming roller 2. The cast film passes through the tensioning roller 5 in turn and reaches the grabbing mechanism 3. The squeezing rollers 32 in the grabbing mechanism 3 are symmetrically arranged in the outer shell 31. The cast film passes through the channel between the two squeezing rollers 32. When the cast film enters the channel, the squeezing rollers 32 use their symmetrical structure and appropriate spacing to slightly squeeze the cast film, so that the cast film remains flat and has uniform tension when passing through. The shearing component 36 is arranged close to the channel. When the cast film needs to be cut, the shearing component 36 is started to accurately cut the cast film. Through this structural design, the cast film can achieve automatic cutting and tension control during the forming process, reduce human contact, and improve production efficiency and product quality.

[0035] In addition, the grabbing mechanism 3 of the present invention realizes the automatic cutting and tension control of the cast film through the structural design of the squeezing roller 32 and the shearing component 36. The squeezing roller 32 is symmetrically arranged, which can effectively ensure the flatness and tension uniformity of the cast film during passage, and avoid surface marks and contamination of the cast film caused by human operation. The precise shearing function of the shearing component 36 reduces the errors and waste caused by manual cutting, and improves the production quality and efficiency of the cast film.

[0036] A drive mechanism 34 is provided on the side of the outer shell 31. The drive mechanism 34 is fixed to the output shaft of the electric push rod 42 through a fixing base 35. The drive mechanism 34 includes a motor 1 341 and a motor 2 342. The motor 1 341 is fixed to the surface of the fixing base 35 through a fixing bracket 33. One end of the outer shell 31 is rotatably connected to the fixing base 35, and the other end is connected to the output shaft of the motor 1 341, so that the outer shell 31 can be adjusted to swing through the motor 1 341.

[0037] Both squeezing rollers 32 are driven to rotate by motor 2 342. Gear 1 3421 is installed on the output shaft of motor 2 342. Gear 2 343 is provided on the side of both squeezing rollers 32 close to gear 1 3421. Gear 1 3421 is meshed with one of gear 2 343, and gear 1 3421 is meshed with the other gear 2 343 through gear 3 344, so that the two squeezing rollers 32 are driven to rotate in opposite directions by motor 2 342. Adjustment devices for adjusting the outer diameters of the squeezing rollers 32 are provided in the squeezing rollers 32, so that the outer diameters of the corresponding squeezing rollers 32 can be adjusted respectively through the two adjustment devices, thereby adjusting the thickness of the channel.

[0038] During the cast film forming process, the fixed base 35 is driven to swing toward the cast film below the cast film forming roller 2, allowing the cast film to pass through the channel between the two squeeze rollers 32. The symmetrically arranged squeeze rollers 32 then clamp the cast film. When the cast film needs to be cut, the shear assembly 36 is activated to precisely cut the cast film. In addition, the squeeze rollers 32 are equipped with adjustment devices. By adjusting the outer diameter of the corresponding squeeze roller 32 through the two adjustment devices, the thickness of the channel can be adjusted to accommodate cast films of varying thicknesses.

[0039] Furthermore, a negative pressure flow channel 311 is provided in the outer shell 31. The rotor air compressor 37 is connected to the negative pressure flow channel 311 via a connecting pipe 371. The two ends of the negative pressure flow channel 311 extend to a side of the outer shell 31 away from the shear assembly 36, and the two ends of the negative pressure flow channel 311 are arranged toward each other.

[0040] The end of the squeezing roller 32 away from the gear 2 343 is provided with a connecting shaft 324, which extends to the outside of the outer shell 31, and a gas channel 321 extending in a spiral shape is provided in the squeezing roller 32. The gas channel 321 is connected to the connecting shaft 324, and the gas channel 321 extends outward to the surface of the squeezing roller 32 through a plurality of discharge ports 3211. The surface of the squeezing roller 32 is provided with mounting grooves 322 corresponding to each discharge port 3211, and an inflatable airbag is installed in each mounting groove 322. 323, the expansion airbag 323 is inserted into the discharge port 3211 through a connecting short tube 3231 and communicates with the gas channel 321. A rotor air compressor 37 is provided on the lower side of the squeezing roller 32. The output end and input end of the rotor air compressor 37 are respectively connected to the negative pressure flow channel 311 and the connecting shaft 324 through a connecting tube 371. The rotor air compressor 37 draws air from the negative pressure flow channel 311 into the gas channel 321 through the rotor air compressor 37, thereby inflating all the expansion airbags 323 on the surface of the squeezing roller 32;

[0041] Based on the above, it can be seen that when the rotor air compressor 37 is operating, air in the negative pressure channel 311 is drawn into the gas channel 321 through the connecting pipe 371, causing the expansion bag 323 to inflate. At this time, the two ends of the negative pressure channel 311 are arranged toward each other, forming a negative pressure area. As the cast film passes through the squeeze roller 32, it is subjected to the negative pressure and is attracted to the surface of the squeeze roller 32. Because the two ends of the negative pressure channel 311 are facing each other, the cast film is evenly stretched to both sides by the negative pressure, thereby maintaining the flatness of the cast film.

[0042] Specifically, both ends of the negative pressure channel 311 extend to the side of the outer shell 31 away from the shear assembly 36, and the two ends of the negative pressure channel 311 are arranged to face each other. When negative pressure is generated, the cast film is attracted to the surface of the squeeze roller 32 by the negative pressure as it passes through the squeeze roller 32, and is evenly stretched to both sides by the negative pressure. This design not only maintains the flatness of the cast film, but also controls the tension of the cast film by adjusting the negative pressure, ensuring that the cast film remains in good condition throughout the production process.

[0043] The rotor air compressor 37 , the gas channel 321 , the expansion airbag 323 and the connecting shaft 324 constitute the regulating device.

[0044] In addition, the shearing assembly 36 includes a shearing knife 1 361, a shearing knife 2 362 and a driving cylinder 363. The shearing knife 1 361 and the shearing knife 2 362 are arranged facing each other, and the shearing knife 1 361 and the shearing knife 2 362 are respectively driven by the driving cylinder 363 set on the surface of the outer shell 31, and when the shearing knife 1 361 and the shearing knife 2 362 are close to each other, the cast film passing through the middle of the channel is sheared.

[0045] The present invention also proposes a low-permeability film cast molding process, which is applied to the low-permeability film cast molding production equipment described above. The corresponding tensioning rollers 5 need to be adjusted through all the screw transmission mechanisms 6 so that the two adjacent tensioning rollers 5 are respectively located at the extreme ends of the upper and lower sides, and then the cast film raw material is discharged downward through the cast head 1, and the cast film is extruded and formed by the symmetrically arranged cast molding rollers 2, and the cast film is allowed to fall naturally. Subsequently, the electric push rod 42 is used to drive the grabbing mechanism 3 to move upward to the end of the cast film, and the outer shell 31 is rotated by the motor 1 341 so that the channel between the two extrusion rollers 32 is oriented towards and close to the cast film. When the cast film passes through the channel, the rotor air compressor 37 is used to generate negative pressure at both ends of the negative pressure flow channel 311, and the expansion airbag 323 is expanded outward to squeeze and fix the cast film, and the two extrusion rollers 32 are driven by the motor 2 342 to push the cast film on its surface toward the shearing component 36 by 30 cm;

[0046] The cast film is then sheared by the shearing assembly 36, and the grabbing mechanism 3 is moved by the electric push rod 42 and passed through all the tensioning rollers 5. After that, the end of the cast film is moved to the upper right side of the winding roller 7, the cast film is covered on the surface of the winding roller 7 and wound by the winding roller 7.

[0047] The low-permeability film cast molding process of this invention utilizes automated adjustment of the gap between the forming rollers, the leveling effect of the squeeze rollers, an automated shearing assembly, negative pressure adsorption, and inflatable airbag fixation to effectively address the problems of uneven film surfaces, contamination and marks caused by manual cutting, and low production efficiency in traditional cast film production. This reduces human interaction and improves the degree of automation.

[0048] The above description is merely a preferred embodiment of the present invention and therefore cannot be used to limit the scope of the present invention. In other words, equivalent changes and modifications made according to the scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A low-permeability film cast molding production equipment, including cast molding rollers, slide rails, tensioning rollers and winding rollers, the cast molding rollers are symmetrically arranged, the cast molding rollers are provided with cast heads, the tensioning rollers are arranged in sequence between the cast molding rollers and the winding rollers, each tensioning roller is driven up and down by a wire transmission mechanism, so that the raw material discharged from the cast head is formed into a cast film through the symmetrically arranged cast molding rollers, and the cast film is wound around the winding roller after passing through each tensioning roller in sequence, the slide rail is located below the tensioning roller, a driving slide is slidably installed on the slide rail, and an electric push rod is provided on the driving slide, and a gripping mechanism is provided on the output shaft of the electric push rod, characterized in that The gripping mechanism includes an outer shell, an extrusion roller and a shearing assembly. The extrusion rollers are symmetrically arranged in the outer shell. There is a channel between the two extrusion rollers for the cast film to pass through. The shearing assembly is arranged close to the channel and shears the cast film through the shearing assembly. A driving mechanism is provided on the side of the outer shell, which is fixed to the output shaft of the electric push rod through a fixing seat, and the driving mechanism includes a motor 1 and a motor 2. The motor 1 is fixed to the surface of the fixing seat through a fixing bracket. One end of the outer shell is rotatably connected to the fixing seat, and the other end is connected to the output shaft of the motor 1, so that the outer shell can be adjusted to swing through the motor 1. Both extrusion rollers are driven to rotate by motor 2, and gear 1 is installed on the output shaft of motor 2. Gear 2 is provided on the side of both extrusion rollers close to gear 1. Gear 1 is engaged with one of gears 2, and gear 1 is engaged with the other gear 2 through gear 3, so that the two extrusion rollers are driven to rotate in opposite directions by motor 2, and an adjusting device for adjusting the outer diameter of the extrusion roller is provided in the extrusion roller, so that the outer diameter of the corresponding extrusion roller can be adjusted respectively through the two adjusting devices, thereby adjusting the thickness of the channel.

2. The low-permeability film tape casting production equipment according to claim 1, characterized in that: A negative pressure flow channel is provided in the outer shell, and the rotor air compressor is connected to the negative pressure flow channel through a connecting pipe. Both ends of the negative pressure flow channel extend to a side of the outer shell away from the shear assembly, and the two ends of the negative pressure flow channel are arranged toward each other. The squeezing roller is provided with a connecting shaft at one end away from the gear 2, and the connecting shaft extends outside the outer shell, and a gas channel extending in a spiral shape is provided in the squeezing roller, and the gas channel is connected to the connecting shaft. The gas channel extends outward to the surface of the squeezing roller through multiple discharge ports, and mounting grooves are provided at the surface of the squeezing roller corresponding to each discharge port. An expansion airbag is installed in each mounting groove, and the expansion airbag is inserted into the discharge port through a connecting short tube and is connected to the gas channel. A rotor air compressor is provided on the lower side of the squeezing roller, and the output end and input end of the rotor air compressor are respectively connected to the negative pressure flow channel and the connecting shaft through a connecting pipe, so that the air in the negative pressure flow channel is drawn into the gas channel through the rotor air compressor, and all the expansion airbags on the surface of the squeezing roller are inflated; The rotor air compressor, the gas channel, the expansion airbag and the connecting shaft constitute the regulating device.

3. The low-permeability film tape casting production equipment according to claim 2, characterized in that: The shearing assembly includes shearing blade 1, shearing blade 2 and a driving cylinder. Shearing blade 1 and shearing blade 2 are arranged toward each other, and shearing blade 1 and shearing blade 2 are respectively driven by driving cylinders arranged on the surface of the outer shell. When shearing blade 1 and shearing blade 2 are close to each other, they shear the cast film passing through the middle of the channel.

4. A low-permeability film tape casting process, applied to the low-permeability film tape casting production equipment according to claim 3, characterized in that: The corresponding tensioning rollers need to be adjusted through all the screw drive mechanisms so that the two adjacent tensioning rollers are located at the extreme ends of the upper and lower sides respectively. The cast film raw material is then discharged downward through the cast head, and the cast film is extruded and formed using the symmetrically arranged cast forming rollers. The cast film is then allowed to fall naturally. Subsequently, the electric push rod is used to drive the grabbing mechanism to move upward to the end of the cast film, and the outer shell is rotated by motor 1 so that the channel between the two extrusion rollers is oriented towards and close to the cast film. When the cast film passes through the channel, the rotor air compressor is used to create negative pressure at both ends of the negative pressure flow channel. The outward-expanding expansion airbag squeezes and fixes the cast film, and the two extrusion rollers are driven by motor 2 to push the cast film on its surface 30 cm toward the shearing assembly. The cast film is then cut by the shearing assembly, and the grabbing mechanism is moved by an electric push rod and passed through all the tensioning rollers. The end of the cast film is moved to the upper right side of the winding roller, and the cast film is covered on the surface of the winding roller and wound up by the winding roller.

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