An apparatus for producing a composite wrapping coated paper

Abstract

The application discloses a kind of composite packaging film-coated paper production device, comprising: two receiving and releasing components, including receiving and releasing roller and rotating unit;Guide roller assembly, including several guide rollers, for guiding the transmission path of paper and composite paper, so that the transmission path of paper includes vertically downward composite section;Film-coating assembly, for outputting PE film immediately adjacent to the paper of both sides of composite section downwards;Two extrusion components are correspondingly arranged below two the die mouths, for extruding the PE film output by the corresponding die mouth and connecting one side of paper, so that the two sides of the paper of composite section are simultaneously stacked with two PE films respectively to form composite paper.The composite packaging film-coated paper production device is outputted by film-coating assembly immediately adjacent to the PE film of both sides of composite section downwards, and then two extrusion components are cooperated with each other, the PE film of both sides is respectively co-extruded and connected with the two sides of paper, synchronous film-coating extrusion forming is realized, the occupied space of device is greatly reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of coated paper production technology, and in particular to a production apparatus for composite packaging coated paper. Background Technology

[0002] Aseptic packaging paper for dairy products is a common multilayer composite material. Its simplest layered structure includes a paper layer and protective layers stacked on both sides of the paper layer. The paper layer is usually made of food-grade paper, which provides the composite material with sufficient hardness and mechanical strength and supports the entire packaging. The protective layers on both sides of the paper layer are PE films. The outer PE film serves to waterproof and moisture-proof, while the inner PE film comes into contact with the dairy products inside the packaging. It not only provides moisture and water protection and isolates the dairy products from the packaging material, but also seals the seams by heating during packaging.

[0003] In the production of the aforementioned composite packaging coated paper, after the paper is unwound by the unwinding roller, two coating devices sequentially coat both sides of the paper with PE film along the paper's transport path. This results in the composite coated paper being formed by layering PE film on both sides of the paper. The composite packaging material is then wound and collected. As can be seen from the above production equipment and process, for composite paper with PE film layered on both sides, two coating devices are required to sequentially coat and bond the paper. After coating, the paper needs to be cooled, and guide rollers are used to guide the paper's transport direction so that both sides of the paper face the die head during coating. Therefore, the entire coating system not only occupies a large space but also has low production efficiency.

[0004] Therefore, it is necessary to improve the existing composite packaging coated paper. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects in the prior art and provide a production apparatus for composite packaging coated paper.

[0006] To achieve the above-mentioned technical effects, the technical solution of the present invention is: a production apparatus for composite packaging coated paper, comprising: Both take-up and unwind assemblies include axially horizontal take-up and unwind rollers and a rotating unit that drives the take-up and unwind rollers to rotate about their own axis. The take-up and unwind rollers of the two take-up and unwind assemblies are axially horizontal, one of which is used to unwind paper and the other is used to wind up composite paper. The guide roller assembly, located between the two take-up and release assemblies, includes a plurality of guide rollers whose axes are parallel to the axis of the take-up and release rollers and rotate about their own axis, for guiding the transport path of the paper and the composite paper, so that the transport path of the paper includes a vertically downward composite section. The coating assembly is equipped with two die openings for downward output of PE film that is adjacent to the paper on both sides of the composite section; Two extrusion components are positioned below the two dies, one for each, to extrude the PE film output from the corresponding die onto one side of the paper, so that two PE films are simultaneously stacked on both sides of the composite paper to form a composite paper.

[0007] Preferably, in order to extrude and connect the PE film output from the coating assembly to the paper being conveyed downwards by the composite section, the extrusion assembly includes: The extrusion frame and push-pull unit drive the extrusion frame to move in a horizontal direction perpendicular to the axis of the take-up and untake-down rollers to adjust the horizontal distance between the extrusion frame and the composite section; The carrier unit includes an extrusion roller, a drive roller, a drive unit, and a release film. The axial directions of the extrusion roller and the drive roller are parallel to the axial direction of the take-up roller and rotate around their own axis on the extrusion frame. The drive unit drives the drive roller to rotate around its own axis. The width direction of the release film is parallel to the axial direction of the extrusion roller and is in a closed loop. The drive roller is connected to the extrusion roller via the release film.

[0008] Preferably, in order to achieve cooling of the formed composite paper while co-extruding and bonding, making the device structure more compact and reducing the space occupied, the extrusion roller is a cooling roller.

[0009] Preferably, in order to facilitate the adjustment of the transmission tension of the release film and ensure that the release film can rotate stably along its own circumference, the carrier unit further includes a tensioning mechanism for adjusting the rotational tension of the release film between the extrusion roller and the drive roller.

[0010] Preferably, in order to adjust the tension of the release film and facilitate the replacement of the release film, the tensioning mechanism includes a sliding member that slides on the extrusion frame along a direction parallel to the movement direction of the extrusion frame, a screw sleeve disposed on the extrusion frame, a screw threadedly connected to the screw sleeve and abutting against the sliding member, and the extrusion roller or the drive roller is rotatably connected to the sliding member with its rotation axis parallel to its own axial direction.

[0011] Preferably, in order to improve the cooling effect, each extrusion component has two extrusion rollers distributed along the vertical direction.

[0012] Preferably, in order to further enhance the strength of the co-extrusion connection structure of paper and PE film, the extrusion assembly further includes a pressure unit disposed between the two extrusion rollers. The pressure unit includes a pressure plate, and the paper conveyed to the two extrusion assemblies and the composite paper formed by the PE film stacked on both sides of the paper are bonded between the two pressure plates.

[0013] Preferably, in order to further enhance the cooling effect on the composite paper while co-extruding the PE film and paper, the pressure plate is provided with a liquid cooling channel for introducing coolant, and the side of the pressure plate facing away from the composite section is provided with heat sinks.

[0014] Preferably, in order to facilitate the adjustment of the extrusion pressure of the two sides of the composite paper by the two extrusion components, the pressurizing unit further includes an adjustment mechanism that drives the pressurizing plate to move toward the composite section.

[0015] Preferably, to facilitate the simultaneous output of adjacent downward-facing PE film to both sides of the composite paper section, the coating assembly includes: A screw conveyor is fixedly installed above the two extrusion assemblies, and has a heating element inside. The conveying direction is parallel to the distribution direction of the two extrusion assemblies. The feed tube is installed vertically, and its top end is connected to the output end of the screw conveyor. The die head is fixedly connected to the bottom end of the material tube and has a strip-shaped through hole for paper to pass through and extending parallel to the axial direction of the take-up and take-down rollers. The bottom is provided with two die openings that are adjacent to each other on both sides of the strip-shaped through hole and parallel to the length direction of the strip-shaped through hole. The two die openings are downward to output PE film simultaneously.

[0016] In summary, compared with the prior art, the production device for composite packaging coated paper of the present invention outputs PE film adjacent to both sides of the composite section downward through the coating component, and then the two extrusion components cooperate to co-extrude and connect the PE film on both sides to the two sides of the paper, thereby realizing synchronous coating and extrusion molding. This significantly reduces the space occupied by the device while improving production efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the first embodiment; Figure 2 This is a structural schematic diagram from another perspective of the first embodiment; Figure 3 yes Figure 1 A structural diagram with parts of the rack omitted; Figure 4 yes Figure 3 The front view; Figure 5 yes Figure 4 Enlarged view of part A; Figure 6 This is a schematic diagram of the structure of the retractable assembly in the first embodiment; Figure 7 yes Figure 6 An explosion diagram; Figure 8 This is a schematic diagram of the coating assembly in the first embodiment; Figure 9 This is a schematic diagram of the extrusion assembly in the first embodiment; Figure 10 yes Figure 9 An explosion diagram; Figure 11 This is a partial cross-sectional view of the extrusion assembly of the first embodiment; Figure 12 This is a schematic diagram of the pressurization unit in the first embodiment; Figure 13 yes Figure 12 An explosion diagram; Figure 14 This is a partial structural schematic diagram of the extrusion assembly in the first embodiment; Figure 15 yes Figure 14 An explosion diagram; Figure 16 This is a schematic diagram of the extrusion roller structure in the first embodiment; Figure 17 yes Figure 16 An explosion diagram; Figure 18 This is a structural schematic diagram of the second embodiment; Figure 19 This is a structural schematic diagram from another perspective of the second embodiment; Figure 20 This is a schematic diagram of the coating assembly in the second embodiment; In the diagram: 1. Take-up and untake-down assembly; 11. Take-up and untake-down roller; 111. Protruding ring; 12. Rotating unit; 121. Rotating shaft; 122. First protrusion; 13. Take-up and untake-down frame; 131. Frame groove; 14. Take-up and untake-down bolt; 15. Take-up and untake-down nut; 16. Connecting pipe; 161. First sliding groove; 2. Composite paper; 21. Paper; 22. PE film; 3. Guide roller assembly; 31. Fixed guide roller; 32. Movable guide roller; 33. Guide sleeve; 34. Movable frame; 35. Movable... 36. Moving unit; 4. Guide rod; 5. Coating assembly; 6. Screw conveyor; 7. Material pipe; 8. Die head; 9. Die opening; 10. Strip through hole; 11. Filter; 2. Hopper; 32. Diverter pipe; 43. Switch valve; 5. Extrusion frame; 6. End plate; 7. Third slide; 8. Inclined plate; 9. Support plate; 10. Second slide groove; 11. Connecting plate; 12. Connecting pipe; 13. Second slide; 14. Push-pull unit; 15. 7. Second protrusion; 7. Carrier unit; 71. Extrusion roller; 711. Roller body; 7111. Inner ring; 7112. Heat-conducting strip; 712. Roller sleeve; 713. Roller cover; 7131. Liquid cooling pipe; 714. Fastening bolt; 72. Drive roller; 73. Drive unit; 731. First chute; 732. Locking bolt; 74. Release film; 75. Tensioning mechanism; 751. Sliding component; 752. Screw sleeve; 753. Tensioning screw; 754. Synchronizing frame; 8. Pressurization unit; 81. Pressurization plate; 811. Liquid cooling channel; 812. Heat sink; 813. End cap; 814. First bolt; 82. Adjustment mechanism; 821. Adjustment frame; 822. Moving frame; 8221. Directional rod; 823. Electromagnet; 824. Permanent magnet; 825. Pressure sensor; 826. Second bolt; 9. Frame; 91. First guide rail; 92. Second guide rail; 93. Coating table; 94. Roller frame; 95. Support. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0019] First Embodiment

[0020] like Figures 1-17 As shown, a production apparatus for composite packaging coated paper according to a first embodiment of the present invention includes: Both take-up and unwind assemblies 1 include axially horizontal take-up and unwind rollers 11 and a rotating unit 12 that drives the take-up and unwind rollers 11 to rotate around their own axis. The take-up and unwind rollers 11 of the two take-up and unwind assemblies 1 are axially horizontal, one of which is used to unwind the paper 21 and the other is used to wind up the composite paper 2. The guide roller assembly 3, located between the two take-up and release assemblies 1, includes several guide rollers whose axial direction is parallel to the axial direction of the take-up and release rollers 11 and rotates around their own axis. It is used to guide the transport path of the paper 21 and the composite paper 2, so that the transport path of the paper 21 includes a vertically downward composite section. The coating assembly 4 is provided with two die openings 431 for downward output of PE film 22 that is adjacent to the paper 21 on both sides of the composite section; Two extrusion components are positioned below the two dies 431 in a corresponding manner to extrude the PE film 22 output from the corresponding die 431 to one side of the paper 21, so that two PE films 22 are stacked on both sides of the composite paper 21 to form the composite paper 2.

[0021] In this production apparatus, one take-up and untake-up assembly 1 has a take-up and untake-up roller 11 wound with paper 21 for outputting paper 21, and another take-up and untake-up roller 11 is used to take up composite paper 2. Composite paper 2 includes paper 21 and PE film 22 stacked on both sides of paper 21. When the apparatus is running, the rotating unit 12 drives the take-up and untake-up roller 11 wound with paper 21 to rotate. The guide rollers in the guide roller assembly 3, which rotate around their own axis, guide the transport path of paper 21, so that the transport path of paper 21 includes a vertically downward composite section. The coating assembly 4 outputs PE film 22 adjacent to the paper 21 on both sides of the composite section. At the same time, the two extrusion assemblies cooperate to extrude the PE film 22 on both sides of the paper 21, so that the PE film 22 on both sides of the paper 21 are co-extruded and connected to both sides of the paper 21. After the PE film 22 is stacked on both sides of the paper 21 to form the composite paper 2, it is transferred to another take-up and untake-up roller 11 under the guidance of each guide roller. The take-up and untake-up roller 11 is driven to rotate around its own axis by the rotating unit 12 to realize the winding and collection of the composite paper 2.

[0022] In the above-mentioned device, the coating assembly 4 outputs PE film 22 from both sides of the composite section, and works with two extrusion assemblies to complete the co-extrusion connection, realizing the simultaneous co-extrusion composite connection of two PE films 22 with both sides of the paper 21. There is no need to set up a large number of guide rollers to guide the paper 21 to transport path and to co-extrude the PE film 22 onto both sides of the paper 21 in sequence. Therefore, the space occupied by the device can be greatly reduced. At the same time, since the coating is completed in one step, compared with the two separate coating co-extrusion operations, the production efficiency is also improved.

[0023] To facilitate the installation of the guide roller assembly 3, the coating assembly 4 and the two extrusion assemblies in this production device, the production device also includes a frame 9, which is located between the two take-up and take-down assemblies 1. The guide roller assembly 3, the coating assembly 4 and the two extrusion assemblies are all mounted on the frame 9.

[0024] In the take-up and unwind assembly 1 of this embodiment, the output end of the rotating unit 12 is detachably and rotatably connected to the take-up and unwind roller 11, which facilitates the replacement of the take-up and unwind roller 11 after the take-up and unwind roller 11 has finished unwinding the paper 21 or winding the composite paper 2, thus facilitating continuous production operation of the device. The specific structure of the take-up and unwind assembly 1 is described in detail below. Figure 6 and Figure 7 As shown, the take-up and release assembly 1 also includes a take-up and release frame 13. The take-up and release frame 13 is a U-shaped frame with an upward opening, fixed to the ground. Both ends of the take-up and release frame 13 are provided with frame grooves 131 of the same length direction and whose extension direction is consistent with the axial direction of the take-up and release roller 11, for inserting or removing the take-up and release roller 11. The take-up and release roller 11 is provided with protruding rings 111 on the outer edge of the circumference near both ends. When the end of the take-up and release roller 11 is put into the frame groove 131, the opposite sides of the two protruding rings 111 are respectively attached to the inner walls of the two sides of the take-up and release frame 13, thus preventing the take-up and release roller 11 from axially shifting on the take-up and release frame 13. The rotating unit 12 is a rotating motor fixed on the ground. Its output end is coaxially connected to a rotating shaft 121. A first protrusion 122 is provided on the outer circumferential edge of the rotating shaft 121. A connecting tube 16 is slidably sleeved on the outer side of the rotating shaft 121. A first sliding opening 161 is provided on the outer circumferential edge of the connecting tube 16 near the rotating shaft 121. The length direction of the first sliding opening 161 is parallel to the axial direction of the rotating shaft 121. The first protrusion 122 is fitted and connected to the inner walls of both sides of the first sliding opening 161. The other end of the connecting tube 16 away from the rotating shaft 121 is fixedly connected to the end of the take-up roller 11 located on the take-up frame 13 through a threaded take-up bolt 14 and a take-up nut 15.

[0025] With the above structure, the take-up and untake-up roller 11 is placed on the rack groove 131 of the take-up and untake-up frame 13. The connecting tube 16 is easily slid towards the take-up and untake-up roller 11 through the first sliding opening 161, so that the connecting tube 16 is sleeved outside the end of the take-up and untake-up roller 11. The connecting tube 16 is connected to the take-up and untake-up roller 11 by the threaded take-up and untake-up bolt 14 and take-up and untake-up nut 15. After the rotating unit 12 drives the rotating shaft 121 to rotate, the first protrusion 122 acts on the connecting tube 16, so that the connecting tube 16 drives the take-up and untake-up roller 11 to rotate, realizing the take-up and unwinding operations. When it is necessary to separate the rotating unit 12 from the take-up and untake-up roller 11, the take-up and untake-up bolt 14 and take-up and untake-up nut 15 are unscrewed, and the connecting tube 16 is moved towards the rotating unit 12. After the connecting tube 16 is separated from the take-up and untake-up roller 11, the take-up and untake-up roller 11 can be removed from the take-up and untake-up frame 13.

[0026] In this embodiment, the guide roller assembly 3 includes several fixed guide rollers 31 and several movable guide rollers 32. The frame 9 includes a fixedly installed roller frame 94. The fixed guide rollers 31 are rotatably connected to the roller frame 94, so that the axis of the fixed guide rollers 31 remains fixed. The movable guide rollers 32 are connected to a movable frame 34. The movable frame 34 moves along the vertical direction, so that the axis of the movable guide rollers 32 can move along the vertical direction. The movable frame 34 is connected to a movable unit 35. In this way, the transmission tension of the paper 21 can be changed, ensuring stable and orderly production. The movable unit 35 is a lifting cylinder, and the movable frame 34 includes a horizontal lifting plate. The movable guide roller 32 rotates below the lifting plate. The bottom surface of the lifting plate is fixed with a guide rod 36 extending downward in the vertical direction. The ground is fixed with a guide sleeve 33 extending in the vertical direction. The guide rod 36 and the guide sleeve 33 correspond one-to-one, and the bottom end of the guide rod 36 slides inside the guide sleeve 33. In this way, when the movable unit 35 is running, it can drive the movable frame 34 to rise and fall stably in the vertical direction, which is convenient for changing the paper 21 transmission path and adjusting the paper 21 transmission tension.

[0027] The frame 9 also includes two horizontally fixed coating stages 93, and two coating components 4 are provided, one for each of the two coating stages 93. The specific structure of the coating components 4 is as follows: Figure 8 As shown, the system includes a screw conveyor 41 horizontally fixed above the coating stage 93. The input end of the screw conveyor 41 is fixedly connected to a hopper 45 for conveying plastic granules into the screw conveyor 41. The screw conveyor 41 has a built-in heating element for heating the granules into a molten fluid state. The output end of the screw conveyor 41 is fixedly connected to a filter 44. The bottom end of the filter 44 has a material pipe 42 extending vertically downwards along one side of the coating stage 93. The bottom end of the material pipe 42 is fixedly connected to a die head 43 extending parallel to the axial direction of the take-up and untake-down rollers 11. The bottom end of the die head 43 has a downward-facing die opening 431 of the same length. The screw conveyor 41 conveys the molten material to the filter 44. After filtration by the filter 44, the material flows downwards in the material pipe 42 to the die head 43 and flows out downwards from the die opening 431 of the die head 43, forming a PE film 22.

[0028] A further improvement is that the extrusion assembly includes: The extrusion frame 5 and the push-pull unit 6 are configured to drive the extrusion frame 5 to move in a horizontal direction perpendicular to the axis of the take-up and untake-down rollers 11, so as to adjust the horizontal distance between the extrusion frame 5 and the composite section. The carrier unit 7, located directly below the coating assembly 4, includes an extrusion roller 71, a drive roller 72, a drive unit 73, and a release film 74. The axial directions of the extrusion roller 71 and the drive roller 72 are parallel to the axial direction of the take-up roller 11 and rotate around their own axis on the extrusion frame 5. The drive unit 73 drives the drive roller 72 to rotate around its own axis. The width direction of the release film 74 is parallel to the axial direction of the extrusion roller 71 and is in a closed loop. The drive roller 72 is connected to the extrusion roller 71 via the release film 74.

[0029] With the above design, the release film 74 in the carrier unit 7 carries the PE film 22 output from the die 431. The drive unit 73 drives the drive roller 72 to rotate around its own axis. Utilizing the transmission connection between the drive roller 72, the extrusion roller 71, and the release film 74, the release film 74 can rotate circumferentially while the extrusion roller 71 rotates. This brings the PE film 22 on the release film 74 closer to the composite paper 21. At the same time, the extrusion roller 71 squeezes the PE film 22 on the release film 74, achieving co-extrusion connection between the PE film 22 and the paper 21. As the release film 74 continues to rotate, it detaches from the PE film 22 that is firmly connected to the paper 21. When it rotates back to its initial position, it can receive the PE film 22 output from the die 431.

[0030] The push-pull unit 6 can move the extrusion frame 5, thereby adjusting the distance between the extrusion frame 5 and the composite section, and thus adjusting the extrusion force of the extrusion roller 71 on the release film 74, ensuring a stable connection between the release film 74 and the paper 21. After the device has finished production, the push-pull unit 6 can also move the extrusion frame 5 away from the composite section, so that the two extrusion frames 5 are far apart, thereby increasing the space under the two dies 43, which facilitates cleaning and maintenance of the die opening 431 without moving the coating assembly 4.

[0031] A further improvement is that the extrusion roller 71 is a cooling roller.

[0032] With this design, the extrusion roller 71 can cool one side of the composite paper 2 while bearing and applying pressure to the PE film 22 to achieve co-extrusion connection between the PE film 22 and the paper 21 to form the composite paper 2. The extrusion rollers 71 on both sides of the composite section work together to co-extrude and cool both sides of the composite paper 2 at the same time, so that there is no need to install a water cooling cylinder. On the one hand, the device structure is more compact and the space occupied is reduced. On the other hand, it can also improve production efficiency.

[0033] A further improvement is that each extrusion assembly has two extrusion rollers 71, which are distributed along the vertical direction.

[0034] This design enables the device to perform two co-extrusion connections between the PE film 22 on both sides of the paper 21 and the paper 21, ensuring the connection strength between the paper 21 and the PE film 22. At the same time, it can also cool the composite paper 2 twice, preventing the composite paper 2 from being in a high-temperature state after co-extrusion connection, which could easily cause it to stick together due to high temperature during winding and collection, resulting in the final product being scrapped.

[0035] A further improvement is that the carrier unit 7 also includes a tensioning mechanism 75 for adjusting the rotational tension of the release film 74 between the extrusion roller 71 and the drive roller 72.

[0036] The tensioning mechanism 75 allows for easy adjustment of the rotational transmission tension of the release film 74, enabling a good transmission connection between the extrusion roller 71 and the drive roller 72 through the tensioned release film 74. This allows the extrusion roller 71 and the drive roller 72 to rotate stably around their own axis on the extrusion frame 5, while the release film 74 can rotate stably along its own circumference to drive the PE film 22 to move, achieving a stable co-extrusion connection with the composite paper section 21.

[0037] To adjust the rotational tension of the release film 74, the tensioning mechanism 75 includes a sliding member 751 that slides on the extrusion frame 5 along a direction parallel to the movement of the extrusion frame 5, a threaded sleeve 752 disposed on the extrusion frame 5, and a tensioning screw 753 threadedly connected to the threaded sleeve 752 and abutting against the sliding member 751. The extrusion roller 71 or the drive roller 72 is rotatably connected to the sliding member 751, and its rotation axis is parallel to its own axial direction. Specifically, the drive roller 72 is rotatably connected to the sliding member 751, and its rotation axis is parallel to its own axial direction. Correspondingly, as shown... Figure 9 and Figure 10 As shown, the frame 9 also includes a first guide rail 91, a second guide rail 92 and a bracket 95 that are parallel and fixed in the length direction. The push-pull unit 6 is disposed on the bracket 95, the drive unit 73 is disposed on the first guide rail 91, the second guide rail 92 is disposed on both sides of the extrusion frame 5, and the extrusion frame 5 slides on the second guide rail 92. The length direction of the first guide rail 91 and the second guide rail 92 are both perpendicular to the axial direction of the take-up and untake-down roller 11.

[0038] like Figure 14 and Figure 15As shown, the extrusion frame 5 includes two end plates 51 arranged parallel to the axial direction of the take-up and untake-down rollers 11. Both end plates 51 are triangular frame structures. The bottoms of the two end plates 51 are fixedly connected by an inclined plate 52. The inclined plate 52 extends along the axial direction parallel to the take-up and untake-down rollers 11. Both ends of the inclined plate 52 are fixedly connected to horizontal second slide grooves 54 by vertically arranged support plates 53. The second slide grooves 54 slide one-to-one above the second guide rail 92. The two second slide grooves 54 are connected by a connection whose length direction is consistent with the length direction of the inclined plate 52. The connecting plate 55 is fixedly connected, and the side of the connecting plate 55 facing away from the composite section is provided with a connecting pipe 56. The axial direction of the connecting pipe 56 is parallel to the length direction of the second guide rail 92. A second sliding opening 561 extending parallel to its circumferential direction is provided on the outer edge of the connecting pipe 56. The push-pull unit 6 includes a push-pull cylinder. The cylinder is fixed on the bracket 95 and its axial direction is parallel to the axial direction of the connecting pipe 56. The piston rod is located inside the connecting pipe 56 at one end away from the cylinder and a second protrusion 61 located inside the second sliding opening 561 is provided on its outer edge.

[0039] With the above design, the push-pull unit 6 is supported by the bracket 95. When the push-pull unit 6 is running, the second protrusion 61 on the outer edge of its piston rod acts on the inner walls of both ends of the second slide 561, thereby driving the connecting pipe 56 to move along its axial direction, thereby adjusting the horizontal position of the extrusion frame 5 and changing its distance from the composite section.

[0040] To adjust the distance and position of the drive roller 72 and thus adjust the rotational tension of the release film 74, a third sliding opening 511 is provided on the end plate 51. The third sliding opening 511 extends along the length direction parallel to the second guide rail 92 to the side of the end plate 51 away from the composite section on the circumferential outer edge. The sliding member 751 slides on the inner side of the third sliding opening 511. To ensure that the two sliding members 751 in the extrusion assembly are at the same horizontal distance relative to the composite section, the two sliding members 751 are fixedly connected by a horizontal and U-shaped synchronous frame 754. The U-shaped opening of the synchronous frame 754 faces the composite section. In the tensioning mechanism 75, the screw sleeve 752 is fixed to the outside of the end plate 51 and is axially parallel to the length direction of the second guide rail 92. The tensioning screw 753 passes through the inner side of the screw sleeve 752 and is threadedly connected to the circumferential inner wall of the screw sleeve 752. The end of the tensioning screw 753 away from the composite section abuts against the sliding member 751.

[0041] With the above structure, when it is necessary to increase the tension, the two sliding parts 751 are pulled away from the composite section by the synchronous frame 754 along the third sliding opening 511, and the tensioning screws 753 on both sides are rotated so that their ends abut against the sliding parts 751, thereby increasing the tension of the release film 74; conversely, the tensioning screws 753 are rotated in the opposite direction to bring them closer to the composite section, so that the sliding parts 751 can move closer to the composite section, which makes it easier to reduce the tension of the release film 74 and also makes it easier to replace the release film 74. When the release film 74 expires, the release film 74 is removed (it can be removed directly by tearing), and a new strip release film 74 is wound around the two extrusion rollers 71 and one drive roller 72, so that its ends overlap to form a closed loop. The ends are then heat-sealed so that the new release film 74 has a strip structure, and then the release film 74 is tensioned by the tensioning mechanism 75.

[0042] The drive unit 73 includes a drive motor. The output end of the drive motor is fixedly connected to the roller shaft of the drive roller 72 along the same axis. A first slide groove 731 is fixed below the drive motor. The first slide groove 731 slides on the first guide rail 91. This allows the horizontal position of the drive roller 72 to be adjusted and the position of the drive motor to be changed simultaneously, based on the sliding member 751 sliding within the third slide opening 511. The first slide groove 731 is threadedly connected to a locking bolt 732, which is used to lock the horizontal position of the drive motor and the first slide groove 731 on the first guide rail 91. After the position of the sliding member 751 is adjusted, the locking bolt 732 is tightened so that the locking bolt 732 abuts against the first guide rail 91, which facilitates fixing the position of the first slide groove 731 and the drive motor. When it is necessary to adjust the position of the drive roller 72, the locking bolt 732 is loosened to disengage it from the first guide rail 91, which allows the first slide groove 731 to move along the first guide rail 91 and the second slide groove 54 to move along the second guide rail 92.

[0043] The specific structure of the extrusion roller 71 in this embodiment is as follows: Figure 16 and Figure 17As shown, the extrusion roller 71 includes a rigid, cylindrical roller body 711, an elastic roller sleeve 712 surrounding the roller body 711, and mounting grooves extending axially along the outer edge of the roller body 711. The inner wall of the roller sleeve 712 has mounting protrusions that correspond to and fit the mounting grooves. An inner ring 7111, coaxial with the roller body 711, is located near the openings at both ends. Heat-conducting strips 71 extending axially from the roller body 711 are arranged in a ring array between the two inner rings 7111. 12. Roller covers 713 are fixedly connected to both ends of roller body 711 by fastening bolts 714 arranged in a ring array. Roller covers 713 are stepped and abut against inner ring 7111, end of roller body 711 and end of roller sleeve 712. Roller body 711 and two roller covers 713 enclose a liquid cooling cavity. A liquid cooling pipe 7131 is integrally formed on roller cover 713, which is coaxial with roller body 711 and communicates with liquid cooling cavity. Liquid cooling pipe 7131 rotates around its own axis on the corresponding end plate 51 through bearing.

[0044] With the above structure, coolant (usually water) is conveniently supplied to the liquid cooling chamber through one of the liquid cooling pipes 7131 on the roller covers 713 at both ends. The heat-conducting strip 7112 facilitates the absorption of heat by the coolant to cool the composite paper 2. The coolant that has absorbed heat is discharged through the liquid cooling pipe 7131 at the other end. In this way, the extrusion roller 71 is always filled with low-temperature coolant to cool the composite paper 2 that is continuously coated. The roller body 711 is preferably a copper alloy or aluminum alloy to ensure good thermal conductivity. The roller sleeve 712 is an elastic heat-conducting sleeve, preferably thermally conductive silicone rubber or thermally conductive polyurethane. These materials usually have thermally conductive fillers such as alumina and boron nitride added inside to improve thermal conductivity and energy absorption while ensuring good elasticity of the extrusion roller 71. On the one hand, it can apply extrusion pressure to the PE film 22 to ensure good co-extrusion connection between the PE film 22 and the paper 21. On the other hand, it ensures good transmission connection between the extrusion roller 71, the drive roller 72 and the release film 74.

[0045] A further improvement is that the extrusion assembly also includes a pressure unit 8 disposed between the two extrusion rollers 71. The pressure unit 8 includes a pressure plate 81. The paper 21 conveyed by the two extrusion assemblies and the composite paper 2 formed by the PE films 22 stacked on both sides of the paper 21 are bonded between the two pressure plates 81. The pressure plate 81 is provided with a liquid cooling channel 811 for introducing coolant. A heat sink 812 is provided on the side of the pressure plate 81 facing away from the composite section. The pressure unit 8 also includes an adjustment mechanism 82 that drives the pressure plate 81 to move toward the composite section.

[0046] In the pressurizing unit 8, the pressing force of the pressurizing plate 81 on the release film 74 corresponding to the composite section is adjusted by the adjusting mechanism 82, so that the pressurizing units 8 on both sides work together to achieve a firm connection between the PE film 22 on both sides of the composite paper 21 and the paper 21. This avoids excessive pressing force, which would affect the stable downward transmission and movement of the paper 21 and the composite paper 2, while also avoiding insufficient pressing force, which would make it difficult to ensure a stable and firm connection between the paper 21 and the PE film 22, leading to delamination in subsequent products. In addition, while pressing the composite paper 2, coolant can also be introduced into the liquid cooling channel 811. Using the release film 74 and the pressurizing plate 81 as heat conduction media, the composite paper 2 absorbs heat and cools down. The heat sink 812 on the back enables the pressurizing plate 81 to dissipate heat quickly and can also absorb heat from the release film 74 to cool it down, preventing the release film 74 from being in a high-temperature state for a long time and shortening its service life.

[0047] The specific structure of pressurization unit 8 is as follows: Figures 11-13 As shown, in the pressurizing unit 8, the length direction of the pressurizing plate 81 is parallel to the axial direction of the take-up and untake-down roller 11. The two ends of the pressurizing plate 81 are provided with recesses. The liquid cooling channel 811 is in the shape of a through hole, extending along the length direction parallel to the pressurizing plate 81, and the two ends are respectively connected to the two recesses. The recess is fixed with an end cap 813 by the first bolt 814. A connecting pipe is integrally formed on the end cap 813. The connecting pipe is connected to the recess. One end of the connecting pipe is used to introduce coolant, and the other end of the connecting pipe is used to discharge coolant. In this way, after the coolant enters the corresponding recess through the connecting pipe at one end, it is divided into multiple paths and flows through multiple liquid cooling channels 811 to another recess. During the flow, it absorbs the heat of the release film 74 and the composite paper 2 to cool down. After the coolant is heated, it flows into another recess and is discharged from the connecting pipe corresponding to that recess.

[0048] The adjustment mechanism 82 includes an adjustment frame 821, a movable frame 822, and a telescopic unit disposed between the adjustment frame 821 and the movable frame 822. The adjustment frame 821 is fixedly connected to the extrusion frame 5. Specifically, the adjustment frame 821 is fixed between two end plates 51. The movable frame 822 is fixedly connected to the pressure plate 81 by a second bolt 826. Multiple telescopic units are distributed along the axial direction of the take-up and release rollers 11. Each telescopic unit includes an electromagnet 823, a permanent magnet 824, and a pressure sensor 825, which are sequentially distributed along the length direction of the first guide rail 91. The electromagnet 823 is fixed to the adjustment frame 821, and the permanent magnet 824 is fixed to the movable frame 822 by the pressure sensor 825. The electromagnet 823 and the permanent magnet 824 are magnetically repelled and are arranged adjacent to each other. The movable frame 822 is also fixedly connected to a directional rod 8221 that slides through the adjustment frame 821. The directional rod 8221 extends along the length direction parallel to the first guide rail 91 to ensure that the movable frame 822 moves smoothly along the length direction of the first guide rail 91.

[0049] With the above structure, the electromagnet 823 and the permanent magnet 824, which are magnetically attracted and repulsed, work together to generate a pushing force on the moving frame 822, thereby causing the pressure plate 81 to tend to move towards the composite section. By controlling the current inside the coil of the electromagnet 823, the repulsive force between the electromagnet 823 and the permanent magnet 824 can also be adjusted. The pressure sensor 825 is used to conveniently detect the pressure on the moving frame 822, and the current passing through the electromagnet 823 can be adjusted according to the pressure data to adjust the pressure applied by the pressure plate 81 to the composite paper 2 on the composite section through the release film 74.

[0050] Second Embodiment

[0051] like Figures 18-20 As shown, a production apparatus for composite packaging coated paper according to a second embodiment of the present invention is based on the first embodiment, except that: the coating component 4 includes: The screw conveyor 41 is fixedly installed above the two extrusion components, and has a heating element inside. The conveying direction is parallel to the distribution direction of the two extrusion components. The feed tube 42 is installed vertically, and its top end is connected to the output end of the screw conveyor 41; The die head 43 is fixedly connected to the bottom end of the material tube 42 and has a strip-shaped through hole 432 for paper 21 to pass through and extending along the axial direction parallel to the take-up and take-down roller 11. The bottom is provided with two die openings 431 that are adjacent to each other on both sides of the strip-shaped through hole 432 and parallel to the length direction of the strip-shaped through hole 432. The two die openings 431 are downward to output PE film 22 simultaneously.

[0052] Compared to the first embodiment, this embodiment only has one coating assembly 4, so that the frame 9 only needs to be equipped with one coating station 93 to achieve the coating of the screw conveyor 41, which can also greatly reduce the space occupied by the device and make the device structure more compact.

[0053] Specifically, the output end of the screw conveyor 41 is fixedly connected to a diversion pipe 46, which is a U-shaped pipe. The middle part is connected to the output end of the screw conveyor 41, and both ends are provided with switching valves 47, which are fixedly connected to the upper ends of the die head 43 through two filters 44 respectively. The die head 43 is provided with a strip-shaped through hole 432 extending along its length for the paper 21 of the composite section to pass through. The bottom of the die head 43 is provided with a die opening 431 extending downward along the length direction parallel to the strip-shaped through hole 432. The die opening 431 is connected to the cavity of the material pipe 42 through the inner cavity of the die head 43.

[0054] The screw conveyor 41 operates, transporting the material in the hopper 45 to its inner cavity and heating it into a molten fluid state. It is then divided into two paths through the diversion pipe 46, and after passing through the filter 44, it flows downward in the material pipe 42. It converges in the inner cavity of the die head 43 and is then divided into two paths to be output downward from the two die openings 431, forming two PE films 22. Under the action of the two extrusion components, they are connected with the paper 21 passing through the strip-shaped through hole 432 to form the composite paper product 2.

[0055] It should be noted that, before applying the PE film 22 to the surface of the paper 21, corona treatment is preferably performed to further improve the forming quality and enhance the adhesion between the paper 21 and the PE film 22. Specifically, corona treatment can be applied to both sides of the paper 21 using a corona device. The corona device is located between the take-up / untake-up assembly 1 corresponding to the unwound paper 21 and the two coating assemblies 4. This corona treatment is used to overcome the physical and chemical barriers on the surface of the paper 21, change its surface tension, improve wettability, enhance the mechanical bonding with the PE film 22, reduce the risk of delamination, and thus improve the forming quality of the composite paper 2.

[0056] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A production apparatus for composite packaging coated paper, characterized in that, include: Both take-up and unwind assemblies include axially horizontal take-up and unwind rollers and a rotating unit that drives the take-up and unwind rollers to rotate about their own axis. The take-up and unwind rollers of the two take-up and unwind assemblies are axially horizontal, one of which is used to unwind paper and the other is used to wind up composite paper. The guide roller assembly, located between the two take-up and release assemblies, includes a plurality of guide rollers whose axes are parallel to the axis of the take-up and release rollers and rotate about their own axis, for guiding the transport path of the paper and the composite paper, so that the transport path of the paper includes a vertically downward composite section. The coating assembly is equipped with two die openings for downward output of PE film that is adjacent to the paper on both sides of the composite section; Two extrusion components are arranged one-to-one below the two dies to extrude the PE film output from the corresponding dies to one side of the paper, so that two PE films are stacked on both sides of the composite paper to form a composite paper. The extrusion assembly includes: The extrusion frame and push-pull unit drive the extrusion frame to move in a horizontal direction perpendicular to the axis of the take-up and untake-down rollers to adjust the horizontal distance between the extrusion frame and the composite section; The carrier unit includes an extrusion roller, a drive roller, a drive unit, and a release film. The axial directions of the extrusion roller and the drive roller are parallel to the axial direction of the take-up roller and rotate around their own axis on the extrusion frame. The drive unit drives the drive roller to rotate around its own axis. The width direction of the release film is parallel to the axial direction of the extrusion roller and is in a closed loop. The drive roller is connected to the extrusion roller via the release film. Each extrusion assembly has two extrusion rollers, which are distributed along the vertical direction. The extrusion assembly further includes a pressure unit disposed between the two extrusion rollers. The pressure unit includes a pressure plate, and the paper conveyed to the two extrusion assemblies and the composite paper formed by the PE film stacked on both sides of the paper are bonded between the two pressure plates. The pressure plate is provided with a liquid cooling channel for introducing coolant, and the side of the pressure plate facing away from the composite section is provided with heat sinks.

2. The production apparatus for composite packaging coated paper according to claim 1, characterized in that: The extrusion roller is a cooling roller.

3. The production apparatus for composite packaging coated paper according to claim 1, characterized in that: The carrier unit also includes a tensioning mechanism for adjusting the rotational tension of the release film between the extrusion roller and the drive roller.

4. The production apparatus for composite packaging coated paper according to claim 3, characterized in that: The tensioning mechanism includes a sliding member that slides on the extrusion frame along a direction parallel to the movement of the extrusion frame, a threaded sleeve disposed on the extrusion frame, a tensioning screw threadedly connected to the threaded sleeve and abutting against the sliding member, and the extrusion roller or the drive roller being rotatably connected to the sliding member with its rotation axis parallel to its own axial direction.

5. The production apparatus for composite packaging coated paper according to any one of claims 1-4, characterized in that: The coating assembly includes: A screw conveyor is fixedly installed above the two extrusion assemblies, and has a heating element inside. The conveying direction is parallel to the distribution direction of the two extrusion assemblies. The feed tube is installed vertically, and its top end is connected to the output end of the screw conveyor. The die head is fixedly connected to the bottom end of the material tube and has a strip-shaped through hole for paper to pass through and extending parallel to the axial direction of the take-up and take-down rollers. The bottom is provided with two die openings that are adjacent to each other on both sides of the strip-shaped through hole and parallel to the length direction of the strip-shaped through hole. The two die openings are downward to output PE film simultaneously.

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