Low-permeability film tape casting production equipment and process

Abstract

The invention relates to the field of cast film forming, and discloses low-permeability film tape casting production equipment and a low-permeability film tape casting production process, the low-permeability film tape casting production equipment comprises tape casting rollers, a slide rail, a tension roller and a wind-up roller, the tape casting rollers are symmetrically arranged, a tape casting head is arranged on each tape casting roller, and in the cast film forming process, the tension rollers are arranged on the slide rail. Raw materials discharged by a casting head form a casting film under the action of a casting forming roller, the casting film sequentially passes through a tensioning roller and then reaches a grabbing mechanism, extrusion rollers in the grabbing mechanism are symmetrically arranged in an outer shell, the casting film penetrates through a channel between the two extrusion rollers, and when the casting film enters the channel, the extrusion rollers are separated from the channel. The extrusion rollers slightly extrude the casting film through the symmetrical structure and the proper distance of the extrusion rollers, the casting film is kept flat and uniform in tension when passing through the extrusion rollers, the shearing assembly is arranged close to the channel, and when the casting film needs to be cut, the shearing assembly is started to precisely shear the casting film, so that the automatic machining procedure of the casting film can be formed, and the production efficiency is improved. And the casting film is prevented from being polluted in the processing process.

Description

Technical Field

[0001] The present invention relates to the field of casting film forming, and specifically to a casting forming production device and process for low-permeability films. Background Art

[0002] A casting film is a non-stretched and non-oriented flat extruded film produced by melt casting and rapid cooling. The casting film has excellent heat-sealing performance and good transparency, and is one of the main packaging composite substrates, which is used for producing high-temperature retort films and vacuum aluminized films, etc., and has good market prospects; In the existing casting film, during each cold plastic casting forming, it is necessary to continuously adjust the forming thickness of the casting film. At the beginning of the casting film forming, it is necessary to adjust the distance between the forming rollers, which will make the surface of the casting film uneven. After manually cutting off this part of the casting film and adjusting the distance between the forming rollers, a casting film meeting the standards can be produced. However, fingerprints, dust, hair debris, etc. will be left on the surface of the casting film during the manual cutting process. Therefore, it is necessary to repeatedly confirm the working environment of the operator before operation and avoid repeated contamination of the surface of the casting film. Such an operation process is really inconvenient. Therefore, a forming production device that can reduce human contact during the casting film forming is needed. Summary of the Invention

[0003] The present invention provides a casting forming production device and process for low-permeability films, which overcomes the deficiencies described in the background art.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows: A casting forming production device for low-permeability films includes casting forming rollers, slide rails, tension rollers, and winding rollers. The casting forming rollers are symmetrically arranged, and casting heads are provided on the casting forming rollers. The tension rollers are arranged in sequence between the casting forming rollers and the winding rollers. Each tension roller is driven to lift through a screw drive mechanism, so as to form the raw material discharged from the casting head into a casting film through the symmetrically arranged casting forming rollers, and let the casting film pass through each tension roller in sequence and then wind around the winding roller. The slide rail is located below the tension roller, and a driving slide is slidably installed on the slide rail. An electric push rod is provided on the driving slide, and a grasping mechanism is provided on the output shaft of the electric push rod. The grasping mechanism includes a housing, extrusion rollers, and a shearing component. The extrusion rollers are symmetrically arranged in the housing, and a channel for the casting film to pass through exists between the two extrusion rollers. The shearing component is arranged close to the channel, and the casting film is sheared by the shearing component; A driving mechanism is provided on the side surface of the housing. The driving mechanism is fixed to the output shaft of the electric push rod through a fixing seat, and the driving mechanism includes a first motor and a second motor. The first motor is fixed to the surface of the fixing seat through a fixing bracket. One end of the housing is rotatably connected to the fixing seat, and the other end is connected to the output shaft of the first motor to adjust the swing of the fixing seat through the first motor; Both extrusion rollers are driven to rotate by the second motor. A first gear is installed on the output shaft of the second motor. On the side of both extrusion rollers close to the first gear, there are second gears. The first gear meshes with one of the second gears, and the first gear meshes with the other second gear through a third gear, so as to drive the two extrusion rollers to rotate in opposite directions by the second motor. And an adjusting device for adjusting the outer diameter of the extrusion roller is arranged in the extrusion roller, so as to adjust the outer diameter of the corresponding extrusion roller through the two adjusting devices respectively, thereby adjusting the thickness of the channel.

[0005] In a preferred technical solution, a negative pressure flow channel is arranged in the housing body. The rotary air compressor is connected to the negative pressure flow channel through a connecting pipe. Both ends of the negative pressure flow channel extend to the side of the housing body far from the shearing assembly, and both ends of the negative pressure flow channel are arranged facing each other; One end of the extrusion roller far from the second gear is provided with a connecting shaft, and the connecting shaft extends outside the housing body. And a gas channel extending in a spiral shape is arranged in the extrusion roller. The gas channel is connected to the connecting shaft. The gas channel extends outward to the surface of the extrusion roller through a plurality of discharge ports. Installation grooves are arranged at the corresponding positions of the surface of the extrusion roller and each discharge port. An expansion air bag is installed in each installation groove. The expansion air bag is snapped into the discharge port through a connecting short pipe and is connected to the gas channel. A rotary air compressor is arranged below the extrusion roller. The output end and the input end of the rotary air compressor are respectively connected to the negative pressure flow channel and the connecting shaft through a connecting pipe, so as to extract the air in the negative pressure flow channel into the gas channel through the rotary air compressor and expand all the expansion air bags on the surface of the extrusion roller; The rotary air compressor, the gas channel, the expansion air bag and the connecting shaft form the adjusting device.

[0006] In a preferred technical solution, the shearing assembly includes a first shearing knife, a second shearing knife and a driving cylinder. The first shearing knife and the second shearing knife are arranged facing each other, and the first shearing knife and the second shearing knife are respectively driven by the driving cylinders arranged on the surface of the housing body. When the first shearing knife and the second shearing knife approach each other, the casting film passing through the middle of the channel is sheared.

[0007] A low-permeability film casting forming process is applied to the low-permeability film casting forming production equipment described above. It is necessary to adjust the corresponding tension rollers through all the screw drive mechanisms so that two adjacent tension rollers are respectively located at the outermost ends on the upper and lower sides. Then, the casting film raw material is discharged downward through the casting head, and the casting film is extruded and formed by the symmetrically arranged casting forming rollers, and the casting film is allowed to fall naturally. Subsequently, the electric push rod is used to drive the grasping mechanism to move upward to the end of the casting film, and the housing body is rotated by the first motor so that the channel between the two extrusion rollers faces and approaches the casting film. When the casting film passes through the channel, the negative pressure at both ends of the negative pressure flow channel is created by the rotary air compressor, the expansion air bags are expanded outward to squeeze and fix the casting film, and the two extrusion rollers are driven by the second motor to push the casting film on their surfaces towards the shearing assembly by 30 cm; Subsequently, the casting film is cut by the cutting component. After moving the grasping mechanism through all the tension rollers by using the electric push rod, when the end of the casting film is moved above the right side of the winding roller, the casting film is covered on the surface of the winding roller and wound by the winding roller.

[0008] Compared with the prior art, this technical solution has the following advantages: During the formation process of the casting film, the raw materials discharged from the casting head form a casting film under the action of the casting forming roller. After passing through the tension rollers in sequence, the casting film reaches the grasping mechanism. The pressing rollers in the grasping mechanism are symmetrically arranged in the outer shell body. The casting film passes through the channel between the two pressing rollers. When the casting film enters this channel, the pressing rollers slightly press the casting film through their symmetrical structure and appropriate spacing, so that the casting film remains flat and has uniform tension when passing through. The cutting component is arranged close to the channel. When it is necessary to cut the casting film, the cutting component is started to precisely cut the casting film. In this way, an automated processing procedure for the casting film can be formed, avoiding the pollution of the casting film during the processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention will be further described below with reference to the drawings and embodiments.

[0010] Figure 1 It is the overall view of the present invention.

[0011] Figure 2 It is the schematic diagram of the grasping mechanism.

[0012] Figure 3 It is the schematic diagram of another perspective of the grasping mechanism.

[0013] Figure 4 It is the structural schematic diagram of the pressing roller and the driving mechanism.

[0014] Figure 5 It is the structural schematic diagram of the negative pressure flow channel and the rotary air compressor.

[0015] Figure 6 It is the schematic diagram of the pressing roller.

[0016] Figure 7 It is the exploded schematic diagram of the pressing roller.

[0017] Figure 8 It is the structural schematic diagram of the installation groove and the expansion airbag.

[0018] In the figure: casting head 1, casting forming roller 2, grasping mechanism 3, slide rail 4, tension roller 5, screw drive mechanism 6, winding roller 7; outer shell body 31, pressing roller 32, fixed bracket 33, driving mechanism 34, fixed seat 35, cutting component 36, rotary air compressor 37; negative pressure flow channel 311; Gas passage 321, mounting groove 322, discharge port 3211, expansion airbag 323, connecting short pipe 3231, connecting shaft 324; Motor 1 341, Motor 2 342, Gear 1 3421, Gear 2 343, Gear 3 344; Shearing knife 1 361, Shearing knife 2 362, driving cylinder 363; Connecting pipe 371. Specific implementation mode

[0019] As Figures 1 to 8 shown, a low-permeability film casting and forming production device is proposed in the present invention, including a casting and forming roller 2, a slide rail 4, a tensioning roller 5 and a winding roller 7. The casting and forming rollers 2 are symmetrically arranged. A casting head 1 is provided on the casting and forming roller 2. The tensioning rollers 5 are arranged in sequence between the casting and forming roller 2 and the winding roller 7. Each tensioning roller 5 is driven to lift by a lead screw transmission mechanism 6, so as to form the raw material discharged from the casting head 1 into a casting film through the symmetrically arranged casting and forming rollers 2, and let the casting film pass through each tensioning roller 5 in sequence and then wind around the winding roller 7. The slide rail 4 is located below the tensioning roller 5. A driving slide 41 is slidably mounted on the slide rail 4. An electric push rod 42 is provided on the driving slide 41. A grasping mechanism 3 is provided on the output shaft of the electric push rod 42. The grasping mechanism 3 includes a housing 31, a pressing roller 32 and a shearing assembly 36. The pressing rollers 32 are symmetrically arranged in the housing 31. There is a passage for the casting film to pass between the two pressing rollers 32. The shearing assembly 36 is arranged close to the passage, and the casting film is sheared by the shearing assembly 36; During the casting film forming process, the raw material discharged from the casting head 1 forms a casting film under the action of the casting and forming roller 2. After the casting film passes through the tensioning roller 5 in sequence, it reaches the grasping mechanism 3. The pressing rollers 32 in the grasping mechanism 3 are symmetrically arranged in the housing 31. The casting film passes through the passage between the two pressing rollers 32. When the casting film enters this passage, the pressing rollers 32 slightly press the casting film through their symmetric structure and appropriate spacing, so that the casting film remains flat and has uniform tension when passing through. The shearing assembly 36 is arranged close to the passage. When the casting film needs to be cut, the shearing assembly 36 is started to precisely cut the casting film. Through this structural design, the casting film can realize automatic cutting and tension control during the forming process, reduce manual contact, and improve production efficiency and product quality.

[0020] Moreover, through the structural design of the extrusion rollers 32 and the shearing assembly 36, the grasping mechanism 3 of the present invention realizes the automatic cutting and tension control of the cast film. The extrusion rollers 32 are symmetrically arranged, which can effectively ensure the flatness and uniform tension of the cast film when passing through, avoiding surface marks and contamination of the cast film caused by manual operation. The precise shearing function of the shearing assembly 36 reduces the errors and waste caused by manual cutting, and improves the production quality and efficiency of the cast film.

[0021] A driving mechanism 34 is provided on the side of the outer housing 31. The driving mechanism 34 is fixed on the output shaft of the electric push rod 42 through a fixing seat 35. The driving mechanism 34 includes a first motor 341 and a second motor 342. The first motor 341 is fixed on the surface of the fixing seat 35 through a fixing bracket 33. One end of the outer housing 31 is rotatably connected to the fixing seat 35, and the other end is connected to the output shaft of the first motor 341 to adjust the swing of the fixing seat 35 through the first motor 341. Both of the two extrusion rollers 32 are driven to rotate by the second motor 342. A first gear 3421 is installed on the output shaft of the second motor 342. A second gear 343 is provided on one side of each of the two extrusion rollers 32 close to the first gear 3421. The first gear 3421 meshes with one of the second gears 343, and the first gear 3421 meshes with the other second gear 343 through a third gear 344, so as to drive the two extrusion rollers 32 to rotate in opposite directions by the second motor 342. An adjusting device for adjusting the outer diameter of the extrusion roller 32 is provided in the extrusion roller 32, so as to adjust the outer diameters of the corresponding extrusion rollers 32 respectively through the two adjusting devices, thereby adjusting the thickness of the channel.

[0022] During the forming process of the cast film, the fixing seat 35 can be driven to swing towards the cast film below the casting forming roller 2, so that the cast film passes through the channel between the two extrusion rollers 32, and the cast film is clamped by the symmetrically arranged extrusion rollers 32. When the cast film needs to be cut, the shearing assembly 36 is started to precisely cut the cast film. In addition, an adjusting device is provided in the extrusion roller 32, and the outer diameters of the corresponding extrusion rollers 32 are adjusted respectively through the two adjusting devices, thereby adjusting the thickness of the channel to adapt to cast films of different thicknesses.

[0023] Furthermore, a negative pressure flow channel 311 is provided in the outer housing 31. The rotary air compressor 37 is connected to the negative pressure flow channel 311 through a connecting pipe 371. The two ends of the negative pressure flow channel 311 respectively extend to the side of the outer housing 31 far from the shearing assembly 36, and the two ends of the negative pressure flow channel 311 are arranged facing each other. One end of the extrusion roller 32 away from the second gear 343 is provided with a connecting shaft 324. The connecting shaft 324 extends outside the outer housing 31. And a gas passage 321 extending in a spiral shape is provided inside the extrusion roller 32. The gas passage 321 is connected to the connecting shaft 324. The gas passage 321 extends outward to the surface of the extrusion roller 32 through a plurality of discharge ports 3211. Installation grooves 322 are arranged at the corresponding positions of the surface of the extrusion roller 32 and each discharge port 3211. An expansion airbag 323 is installed in each installation groove 322. The expansion airbag 323 is snapped into the discharge port 3211 through a connecting short pipe 3231 and is connected to the gas passage 321. A rotary air compressor 37 is arranged below the extrusion roller 32. The output end and the input end of the rotary air compressor 37 are respectively connected to the negative pressure flow channel 311 and the connecting shaft 324 through a connecting pipe 371, so as to extract the air in the negative pressure flow channel 311 into the gas passage 321 through the rotary air compressor 37 and expand all the expansion airbags 323 on the surface of the extrusion roller 32; Based on the above content, it can be known that when the rotary air compressor 37 works, the air in the negative pressure flow channel 311 is extracted into the gas passage 321 through the connecting pipe 371, causing the expansion airbag 323 to expand. At this time, the two ends of the negative pressure flow channel 311 are arranged facing each other, forming a negative pressure area. When the casting film passes through the extrusion roller 32, under the action of the negative pressure, it will be adsorbed on the surface of the extrusion roller 32. Since the two ends of the negative pressure flow channel 311 are facing each other, the casting film will be evenly stretched to both sides under the action of the negative pressure, so as to keep the casting film flat.

[0024] Specifically, the two ends of the negative pressure flow channel 311 extend to the side of the outer housing 31 away from the shearing assembly 36, and the two ends of the negative pressure flow channel 311 are arranged facing each other. When the negative pressure is formed, when the casting film passes through the extrusion roller 32, it will be adsorbed on the surface of the extrusion roller 32 by the negative pressure and evenly stretched to both sides under the action of the negative pressure. This design can not only keep the flatness of the casting film, but also control the tension of the casting film by adjusting the magnitude of the negative pressure to ensure that the casting film always maintains a good state during the production process.

[0025] The rotary air compressor 37, the gas passage 321, the expansion airbag 323 and the connecting shaft 324 constitute the adjusting device.

[0026] Moreover, the shearing assembly 36 includes a first shearing knife 361, a second shearing knife 362 and a driving cylinder 363. The first shearing knife 361 and the second shearing knife 362 are arranged facing each other. And the first shearing knife 361 and the second shearing knife 362 are respectively driven by the driving cylinder 363 arranged on the surface of the outer housing 31. When the first shearing knife 361 and the second shearing knife 362 approach each other, the casting film passing through the middle of the channel is sheared.

[0027] In the present invention, a casting forming process for a low-permeability film is also proposed. This forming process is applied to the casting forming production equipment for the low-permeability film described above. It is necessary to adjust the corresponding tension rollers 5 through all the screw drive mechanisms 6 so that two adjacent tension rollers 5 are respectively located at the outermost ends on the upper and lower sides. Then, the casting film raw material is discharged downward through the casting head 1. The casting film is extruded and formed by the symmetrically arranged casting forming rollers 2, and the casting film is allowed to fall naturally. Subsequently, the electric push rod 42 is used to drive the grasping mechanism 3 to move upward to the end of the casting film, and the outer housing 31 is rotated by the first motor 341 so that the channel between the two extrusion rollers 32 faces and approaches the casting film. When the casting film passes through the channel, the negative pressure at both ends of the negative pressure flow channel 311 is created by the rotary vane air compressor 37, and the expansion airbag 323 expands outward to squeeze and fix the casting film. The two extrusion rollers 32 are driven by the second motor 342 to push the casting film on their surfaces towards the shearing assembly 36 for 30 cm. Subsequently, the casting film is sheared by the shearing assembly 36. After the electric push rod 42 moves the grasping mechanism 3 and passes through all the tension rollers 5, the end of the casting film is moved to the upper right side of the winding roller 7, and the casting film is covered on the surface of the winding roller 7 and wound by the winding roller 7.

[0028] The casting forming process of the low-permeability film of the present invention effectively solves the problems of uneven surface of the casting film, pollution and traces caused by manual cutting, and low production efficiency in the traditional casting film production process through technical means such as automatic adjustment of the spacing between the forming rollers, leveling effect of the extrusion rollers, automatic shearing assembly, negative pressure adsorption and fixing by the expansion airbag. By reducing human contact, the degree of automation is improved.

[0029] The above is only a preferred embodiment of the present invention, and thus the scope of implementation of the present invention cannot be limited thereby. That is, equivalent changes and modifications made according to the scope of the present invention patent and the content of the specification should still fall within the scope covered by the present invention.

Claims

1. A low-permeability film casting and forming production device, comprising a casting and forming roller, a slide rail, a tensioning roller and a winding roller. The casting and forming rollers are symmetrically arranged, and casting heads are provided on the casting and forming rollers. The tensioning rollers are sequentially arranged between the casting and forming rollers and the winding roller. Each tensioning roller is driven to lift through a screw rod transmission mechanism, so as to form the raw material discharged from the casting head into a casting film through the symmetrically arranged casting and forming rollers, and let the casting film pass through each tensioning roller in turn and then wind on the winding roller. The slide rail is located below the tensioning roller, and a driving slide is slidably installed on the slide rail. An electric push rod is provided on the driving slide, and a grasping mechanism is provided on the output shaft of the electric push rod. It is characterized in that, The grasping mechanism includes a housing, extrusion rollers, and a shearing assembly. The extrusion rollers are symmetrically arranged inside the housing, and there is a channel for the casting film to pass between the two extrusion rollers. The shearing assembly is arranged close to the channel, and the casting film is sheared by the shearing assembly. A driving mechanism is provided on the side of the housing. The driving mechanism is fixed on the output shaft of the electric push rod through a fixed seat. The driving mechanism includes a first motor and a second motor. The first motor is fixed on the surface of the fixed seat through a fixed bracket. One end of the housing is rotatably connected to the fixed seat, and the other end is connected to the output shaft of the first motor to adjust the swing of the fixed seat through the first motor. Both extrusion rollers are driven to rotate by the second motor. A first gear is installed on the output shaft of the second motor. A second gear is provided on one side of each extrusion roller close to the first gear. The first gear meshes with one of the second gears, and the first gear meshes with the other second gear through a third gear to drive the two extrusion rollers to rotate in opposite directions by the second motor. An adjusting device for adjusting the outer diameter of the extrusion roller is provided inside the extrusion roller to adjust the outer diameter of the corresponding extrusion roller through the two adjusting devices respectively, so as to adjust the thickness of the channel.

2. The low-permeability film casting and forming production equipment according to claim 1, characterized in that, A negative pressure flow channel is provided inside the housing. The rotary 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 housing far from the shearing assembly respectively, and the two ends of the negative pressure flow channel face each other. A connecting shaft is provided at one end of the extrusion roller far from the second gear. The connecting shaft extends outside the housing. A gas channel extending in a spiral shape is provided inside the extrusion roller. The gas channel is connected to the connecting shaft. The gas channel extends outward to the surface of the extrusion roller through a plurality of discharge ports. Installation grooves are provided at the corresponding positions of the surface of the extrusion roller and each discharge port. An expansion airbag is installed in each installation groove. The expansion airbag is clamped into the discharge port through a connecting short pipe and connected to the gas channel. A rotary air compressor is provided below the extrusion roller. The output end and the input end of the rotary air compressor are respectively connected to the negative pressure flow channel and the connecting shaft through a connecting pipe to extract the air in the negative pressure flow channel into the gas channel through the rotary air compressor and expand all the expansion airbags on the surface of the extrusion roller. The rotary air compressor, the gas channel, the expansion airbag, and the connecting shaft constitute the adjusting device.

3. The low-air-permeability film casting and forming production equipment according to claim 2, characterized in that, The shearing assembly includes a first shearing knife, a second shearing knife, and a driving cylinder. The first shearing knife and the second shearing knife face each other. The first shearing knife and the second shearing knife are respectively driven by the driving cylinders provided on the surface of the housing. When the first shearing knife and the second shearing knife approach each other, the casting film passing through the middle of the channel is sheared.

4. A casting forming process for a low-permeability film, which is applied to a casting forming production device for a low-permeability film as described in claim 3, and is characterized in that, It is necessary to adjust the corresponding tension rollers through all the screw drive mechanisms so that two adjacent tension rollers are respectively located at the outermost ends on the upper and lower sides. Then, the raw material of the casting film is discharged downward through the casting head. The casting film is extruded and formed by the symmetrically arranged casting forming rollers, and the casting film is allowed to fall naturally. Subsequently, the electric push rod is used to drive the grasping mechanism to move upward to the end of the casting film, and the outer shell of the first motor is rotated to make the channel between the two extrusion rollers face and approach the casting film. When the casting film passes through the channel, the negative pressure at both ends of the negative pressure flow channel is created by the rotary vane air compressor, and the expansion airbag expands outward to squeeze and fix the casting film, and the two extrusion rollers are driven by the second motor to push the casting film on their surfaces towards the shearing assembly by 30 cm; Subsequently, the casting film is sheared by the shearing assembly. After the grasping mechanism is moved and passed through all the tension rollers by the electric push rod, the end of the casting film is moved to the upper right side of the winding roller, and the casting film is covered on the surface of the winding roller, and the casting film is wound by the winding roller.

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