Ultralow-gram-weight PLA (polylactic acid) film-coated paper production equipment and production process

Abstract

The invention relates to the technical field of laminated paper production, and provides ultra-low gram weight PLA laminated paper production equipment and a production technology.The ultra-low gram weight PLA laminated paper production equipment comprises a casting machine device and a hot press device, the discharging end of the casting machine device is located on the upper side of the hot press device, a plurality of heating rotating rollers are arranged on the hot press device in a transmission mode, and the heating rotating rollers are located on the upper side of the hot press device; the hot press device is fixedly connected with the trapezoidal groove frame, the heating rollers are rotationally arranged on the trapezoidal groove frame, the discharging end of the casting machine device is located on the side of the heating roller on the middle side, and a material receiving barrel is arranged between the trapezoidal groove frame and the heating roller on the middle side; the material receiving barrel is located on the lower side of the middle side heating rotating roller after rising, and a film guiding assembly is rotationally arranged in the material receiving barrel. According to the technical scheme, the problem that in the prior art, residual polylactic acid raw materials in a casting machine are difficult to discharge is solved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of coated paper production technology, specifically to an ultra-low basis weight PLA coated paper production equipment and production process. Background Technology

[0002] PLA-coated paper is a composite material that combines plastic and paper. In the production process of PLA-coated paper, a casting machine is usually used to coat the surface of paper with molten plastic. Then, hot pressing is performed to bond the plastic film and paper together and form the coated paper as in the existing technology. Because different coated papers are used in different environments, when packaging food or other environmentally friendly products, PLA material, which has more environmental characteristics, is usually used as the plastic film on the coated paper. This is because PLA is composed of polylactic acid molecules, which can degrade in the natural environment, thus avoiding the environmental damage caused by coated paper.

[0003] When producing PLA-coated paper for packaging bags, extremely thin polylactic acid molecules are typically combined with paper as the bonding material to produce ultra-low grammage PLA-coated paper. However, in the current production process of PLA-coated paper, in order to avoid waste of production materials, the production length of the rolled paper and the polylactic acid material filled in the casting machine are kept in correspondence during each production process. However, during the production interval, when completing a single production task or when it is necessary to change the production material, it is always difficult to discharge the excess polylactic acid material in the casting machine. Furthermore, after forcibly discharging the excess polylactic acid material in the casting machine, it is also difficult to quickly recycle the polylactic acid material in the future. Summary of the Invention

[0004] To overcome the above-mentioned defects, embodiments of the present invention provide an ultra-low basis weight PLA coated paper production equipment and production process, which solves the technical problem that it is difficult to discharge the remaining polylactic acid raw materials in the casting machine in the prior art.

[0005] This invention provides an ultra-low basis weight PLA coated paper production equipment, comprising a casting machine and a hot press, wherein the discharge end of the casting machine is located above the hot press, and the hot press is equipped with multiple heated rollers, and further comprising: A trapezoidal groove frame is fixedly connected to the hot press device. Multiple heating rollers are rotatably arranged on the trapezoidal groove frame. The discharge end of the casting machine device is located on the side of the heating roller in the middle. A receiving cylinder is provided between the trapezoidal groove frame and the heating roller in the middle. After the receiving cylinder rises, it is located on the lower side of the heating roller in the middle. A film guiding assembly is rotatably disposed inside the receiving cylinder, so that excess polylactic acid film moves along the center point of the heating roller located on the middle side; A film winding structure is provided on the casting machine for winding up the polylactic acid film after it has been formed.

[0006] At least one embodiment of the present invention provides an ultra-low basis weight PLA coated paper production equipment, wherein a first electric cylinder is provided on both sides of the inner bottom wall of the trapezoidal trough frame, and the output end of the first electric cylinder is fixedly connected to the bottom of the receiving cylinder for driving the receiving cylinder to rise and fall.

[0007] At least one embodiment of the present invention provides an ultra-low basis weight PLA coated paper production device, wherein a rotating area is provided on both sides of the receiving cylinder, and a rotating ring frame is fixedly connected to each of the two rotating areas, and a driving ring is rotatably connected inside the rotating ring frame.

[0008] At least one embodiment of the present invention provides an ultra-low basis weight PLA coated paper production device. The film guiding assembly includes a bending connector and a guiding roller. The bending connector is fixedly connected to the driving rings on both sides. The guiding roller is rotatably connected between the two bending connectors. After the receiving cylinder rises, the guiding roller squeezes the polylactic acid film to fit against the heating roller located in the middle. As the driving ring rotates, the guiding roller is driven to the side close to the film winding structure.

[0009] At least one embodiment of the present invention provides an ultra-low basis weight PLA coated paper production equipment, which further includes a lifting groove frame and a supporting roller. The lifting groove frame is longitudinally movable inside the trapezoidal groove frame, and the supporting roller is rotatably connected inside the lifting groove frame. After the guiding roller moves to one side of the film winding structure, the lifting groove frame rises, causing the supporting roller to support the polylactic acid film and contact the bottom side of the heating roller located in the middle.

[0010] At least one embodiment of the present invention provides an ultra-low basis weight PLA coated paper production equipment, wherein a through groove is provided in the middle of the receiving cylinder, and a second electric cylinder is provided in the middle of the trapezoidal groove frame to drive the lifting groove frame to move longitudinally.

[0011] At least one embodiment of the present invention provides an ultra-low basis weight PLA coated paper production device, wherein a first drive motor is provided on one side of the bottom of the receiving cylinder, and the first drive motor and the drive rotating ring located on the same side are connected by a transmission gear.

[0012] At least one embodiment of the present invention provides an ultra-low basis weight PLA coated paper production equipment, wherein the film winding structure includes a winding groove frame and a winding drum, the winding groove frame is disposed on the casting machine device, and the winding drum is rotatably connected inside the winding groove frame.

[0013] At least one embodiment of the present invention provides an ultra-low basis weight PLA coated paper production device, wherein a cutting tool is slidably connected through the top of the winding tray, and a plurality of abutment grooves corresponding to the cutting tool are formed on the circumference of the side wall of the winding drum.

[0014] A process for producing ultra-low basis weight PLA coated paper includes the following steps: Step 1: Production of coated paper: The paper is moved on the hot press and the polylactic acid raw material is discharged from the casting machine in the form of a thin film, so that the polylactic acid film and the paper are bonded together. The temperature of multiple heated rollers is used to form PLA coated paper with the polylactic acid film and the paper.

[0015] Step 2, Discharge excess material: Move the guide roller to the bottom near the discharge end of the casting machine, and the casting machine continues to discharge polylactic acid film; Step 3: Guiding the film: The polylactic acid film moves between the guide roller and the heating roller located in the middle. The heating roller located in the middle is used to shape the polylactic acid film. Then, the circumferential position of the guide roller is adjusted to guide the polylactic acid film to the side close to the winding drum. Step 4, Supporting the film: The lifting trough frame is raised, causing the supporting roller to bring the polylactic acid film to the bottom side of the heating roller located in the middle. Step 5: Winding up the film: Use a winding drum to wind up the polylactic acid film until all the polylactic acid raw material in the casting machine is discharged. Step 6: Cutting the film: The cutting tool cuts the rolled-up polylactic acid film into sheets; Step 7, Material Change Production: Replace the corresponding paper and polylactic acid raw materials to continue producing PLA coated paper.

[0016] The beneficial effects of the embodiments of the present invention are as follows: 1. In the production process of ultra-low basis weight PLA coated paper, when it is necessary to promptly empty the remaining polylactic acid raw material in the casting machine and facilitate subsequent recycling of the polylactic acid raw material, the receiving cylinder can be driven upward. While the casting machine continues to discharge polylactic acid film, the polylactic acid film moves between the guide roller and the heating roller located on the middle side. The heating roller located on the middle side forms the polylactic acid film. Then, the circumferential position of the guide roller is adjusted to increase the contact area between the polylactic acid film and the heating roller located on the middle side, while guiding the polylactic acid film to the side close to the winding drum. Then, the lifting trough frame is driven upward, so that the support roller drives the polylactic acid film to adhere to the bottom side of the heating roller located on the middle side. Then, the winding drum is used to wind up the polylactic acid film. After the polylactic acid raw material in the casting machine is discharged, the cutting blade is driven to cut the wound polylactic acid film into sheets, which facilitates subsequent crushing and recycling of the polylactic acid film.

[0017] 2. Therefore, during the use of this ultra-low basis weight PLA coated paper production equipment, it is convenient to discharge the remaining polylactic acid raw materials in the casting machine and to recycle the polylactic acid raw materials. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the casting machine, hot press, heating roller, trapezoidal groove frame and receiving cylinder in this invention. Figure 3 This is a schematic diagram of the structure of the heating roller, trapezoidal groove frame, receiving cylinder and winding drum in this invention; Figure 4 This is a partial cross-sectional schematic diagram of the heating roller, trapezoidal groove frame, receiving cylinder, film guiding structure and supporting roller in this invention; Figure 5 For the present invention Figure 4 A magnified structural diagram of part A in the middle; Figure 6 This is a schematic diagram of the cooperation between the film winding structure and the cutting tool in this invention; Figure 7 For the present invention Figure 6 A magnified structural diagram of section B in the middle.

[0020] In the diagram: 1. Casting machine; 2. Hot press; 3. Heating roller; 4. Trapezoidal groove frame; 5. Receiving cylinder; 6. First electric cylinder; 7. Rotating ring frame; 8. Drive ring; 9. Bending connector; 10. Guide roller; 11. Lifting groove frame; 12. Support roller; 13. Second electric cylinder; 14. First drive motor; 15. Rewinding groove frame; 16. Rewinding drum; 17. Cutting tool; 18. Abutment groove; 19. Transmission gear; 20. Second drive motor; 21. Third electric cylinder. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0022] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0023] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0026] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Example 1, as Figures 1 to 4 As shown, this invention discloses an ultra-low basis weight PLA coated paper production equipment, including a casting machine 1 and a hot press 2. The discharge end of the casting machine 1 is located above the hot press 2. Multiple heated rollers 3 are driven onto the hot press 2. The casting machine 1 is a specialized technical equipment for producing plastic cast films in the prior art, and is a technical equipment known to those skilled in the art. It is used to coat molten polylactic acid raw materials into paper in a film form, completing the basic operation for producing ultra-low basis weight PLA coated paper. The hot press 2... Based on driving multiple heating rollers 3 to rotate, the heating medium can also circulate within the heating rollers 3, so that after the paper and polylactic acid film are bonded together, they pass between the multiple heating rollers 3, thus bonding the paper and polylactic acid film together. The hot press device 2 is also a basic piece of equipment for the production of ultra-low basis weight PLA coated paper, and is a technical device known to those skilled in the art. On both sides of the hot press device 2, there are technical devices for traction of the paper and the formed PLA coated paper, realizing the conveying and winding of the paper or PLA coated paper.

[0028] like Figures 1 to 5 As shown, in this embodiment, a trapezoidal groove frame 4 is also included. The trapezoidal groove frame 4 is fixedly connected to the hot press device 2. Multiple heating rollers 3 are rotatably arranged on the trapezoidal groove frame 4. The discharge end of the casting machine device 1 is located on the side of the heating roller 3 in the middle. A receiving cylinder 5 is provided between the trapezoidal groove frame 4 and the heating roller 3 in the middle. After the receiving cylinder 5 rises, it is located on the lower side of the heating roller 3 in the middle. A first electric cylinder 6 is provided on both sides of the inner bottom wall of the trapezoidal groove frame 4. The output end of the first electric cylinder 6 is fixedly connected to the bottom of the receiving cylinder 5 and is used to drive the receiving cylinder 5 to rise and fall. When it is necessary to guide the remaining polylactic acid raw material in the casting machine device 1 to unload, the first electric cylinder 6 is activated to drive the receiving cylinder 5 to rise, so that the guiding roller 10 is close to the heating roller 3 in the middle and guides the polylactic acid film to adhere to the heating roller 3 in the middle.

[0029] like Figures 1 to 5As shown, in this embodiment, rotating areas are provided on both sides of the receiving cylinder 5, and rotating ring frames 7 are fixedly connected to both rotating areas. A driving ring 8 is rotatably connected inside the rotating ring frame 7. When it is necessary to adjust the position of the guide roller 10, the driving ring 8 located on both sides is driven to rotate in their respective rotating ring frames 7, thereby adjusting the position of the guide roller 10.

[0030] like Figures 1 to 5 As shown, in this embodiment, a first drive motor 14 is provided on one side of the bottom of the receiving cylinder 5. The first drive motor 14 and the drive ring 8 located on the same side are connected by a transmission gear 19. The output end of the first drive motor 14 and the drive ring 8 located on the same side are both fixedly fitted with transmission gears 19. The two transmission gears 19 mesh with each other. When the first drive motor 14 is started, the drive ring 8 is driven to rotate through the meshing relationship of the two transmission gears 19.

[0031] like Figures 1 to 5 As shown, in this embodiment, a film guiding assembly is rotatably installed inside the receiving cylinder 5, causing excess polylactic acid film to move along the center point of the heating roller 3 located in the middle. The film guiding assembly includes a bending connector 9 and a guiding roller 10. Bending connectors 9 are fixedly connected to the driving rings 8 on both sides, and the guiding roller 10 is rotatably connected between the two bending connectors 9. When the receiving cylinder 5 rises, the guiding roller 10 squeezes the polylactic acid film to adhere to the heating roller 3 located in the middle. As the driving rings 8 rotate, the guiding roller 10 is driven to the side closer to the film winding structure. When the polylactic acid film is shaped and guided during the casting process, the guide roller 10 is first moved to the bottom near the discharge end of the casting machine device 1. During the process of the casting machine device 1 discharging the polylactic acid film, the guide roller 10 squeezes the polylactic acid film to fit against the heating roller 3 located in the middle. Then, as the polylactic acid film is continuously discharged, the guide roller 10 is driven to move along the center point of the drive ring 8, pulling the polylactic acid film to the side near the winding tray 15, thereby increasing the contact area between the polylactic acid film and the heating roller 3 during the conveying process, and facilitating the subsequent winding of the polylactic acid film.

[0032] like Figures 1 to 5As shown, in this embodiment, a lifting groove frame 11 and a supporting roller 12 are also included. The lifting groove frame 11 is longitudinally movably arranged inside the trapezoidal groove frame 4. The supporting roller 12 is rotatably connected inside the lifting groove frame 11. After the guide roller 10 moves to one side of the film winding structure, the lifting groove frame 11 rises, causing the supporting roller 12 to support the polylactic acid film and contact the bottom side of the heating roller 3 located in the middle. After the guide roller 10 moves the polylactic acid film to one side close to the winding groove frame 15, the lifting groove frame 11 rises, causing the supporting roller 12 to squeeze the polylactic acid film to contact the bottom of the heating roller 3, ensuring stable contact between the polylactic acid film and the heating roller 3.

[0033] like Figures 1 to 5 As shown, in this embodiment, a through groove is provided in the middle of the receiving cylinder 5, and a second electric cylinder 13 is provided in the middle of the trapezoidal trough frame 4 to drive the lifting trough frame 11 to move longitudinally. Activating the second electric cylinder 13 can drive the lifting trough frame 11 to move longitudinally, so that the supporting roller 12 supports the bottom of the polylactic acid film.

[0034] like Figures 1 to 4 and Figures 6 to 7 As shown, in this embodiment, the casting machine device 1 is provided with a film winding structure for winding the polylactic acid film after molding. The film winding structure includes a winding slot 15 and a winding drum 16. The winding slot 15 is provided on the casting machine device 1, and the winding drum 16 is rotatably connected inside the winding slot 15 to keep one side of the unwound polylactic acid film connected to the winding drum 16. A second drive motor 20 is provided on the winding slot 15 to drive the winding drum 16 to rotate. The output end of the second drive motor 20 is connected to the winding drum 16. When the second drive motor 20 is started, it drives the winding drum 16 to rotate, so that the winding drum 16 winds up the polylactic acid film.

[0035] like Figures 1 to 4 and Figures 6 to 7 As shown, in this embodiment, a cutting blade 17 is slidably connected to the top of the winding tray 15. A plurality of abutment grooves 18 corresponding to the cutting blade 17 are provided on the circumference of the side wall of the winding drum 16. After the winding operation of the remaining polylactic acid film is completed, a third electric cylinder 21 is provided on the winding tray 15 to drive the cutting blade 17 to move longitudinally. The output end of the third electric cylinder 21 is connected to the top end of the cutting blade 17. The third electric cylinder 21 is started to drive the cutting blade 17 to move longitudinally, so that the cutting blade 17 descends and the bottom of the cutting blade 17 extends into the abutment groove 18, cutting the polylactic acid film on the winding drum 16 into sheets, which are convenient for subsequent crushing.

[0036] The working principle of this ultra-low basis weight PLA coated paper production equipment: When it is necessary to promptly empty the remaining polylactic acid (PLA) raw material in the casting machine 1, the receiving cylinder 5 can be raised. While the casting machine 1 continues to discharge PLA film, the PLA film moves between the guide roller 10 and the heating roller 3 located in the middle. The heating roller 3 in the middle shapes the PLA film. Then, the circumferential position of the guide roller 10 is adjusted to increase the contact area between the PLA film and the heating roller 3 in the middle. At the same time, the PLA film is guided to the side close to the winding drum 16. Then, the lifting trough frame 11 is raised, so that the support roller 12 brings the PLA film to the bottom side of the heating roller 3 in the middle. Then, the winding drum 16 is used to wind up the PLA film. After the PLA raw material in the casting machine 1 is discharged, the cutting blade 17 is driven to cut the wound PLA film into sheets, which facilitates the subsequent crushing and recycling of the PLA film.

[0037] Example 2: Based on an ultra-low basis weight PLA coated paper production equipment, this invention also proposes an ultra-low basis weight PLA coated paper production method, specifically including the following steps: Step 1: Production of coated paper: The paper is moved on the hot press device 2, and the polylactic acid raw material is discharged from the casting machine device 1 in the form of a thin film, so that the polylactic acid film and the paper are bonded together. The temperature of multiple heated rollers 3 is used to form PLA coated paper with the polylactic acid film and the paper.

[0038] Step 2, Discharge excess material: Move the position of the guide roller 10 to the bottom near the discharge end of the casting machine device 1, and the casting machine device 1 continues to discharge polylactic acid film; Step 3: Guiding the film: The polylactic acid film moves between the guide roller 10 and the heating roller 3 located in the middle. The heating roller 3 located in the middle is used to shape the polylactic acid film. Then, the circumferential position of the guide roller 10 is adjusted to guide the polylactic acid film to the side close to the winding drum 16. Step 4, Supporting the film: The lifting trough frame 11 is raised, so that the supporting roller 12 drives the polylactic acid film to adhere to the bottom side of the heating roller 3 located in the middle. Step 5: Winding up the film: Use the winding drum 16 to wind up the polylactic acid film until the polylactic acid raw material in the casting machine device 1 is completely discharged; Step 6: Cutting the film: Drive the cutting tool 17 to cut the rolled-up polylactic acid film into sheets; Step 7, Material Change Production: Replace the corresponding paper and polylactic acid raw materials to continue producing PLA coated paper.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An ultra-low grammage PLA laminated paper production equipment, comprising a casting machine device (1) and a hot press device (2), the discharge end of the casting machine device (1) is located on the upper side of the hot press device (2), and a plurality of heating rotating rollers (3) are drivenly arranged on the hot press device (2), characterized in that, Also include: Trapezoidal groove frame (4), the hot press device (2) is fixedly connected with the trapezoidal groove frame (4), a plurality of heating rotating rollers (3) are rotationally arranged on the trapezoidal groove frame (4), the discharge end of the casting machine device (1) is located on the side of the heating rotating roller (3) in the middle, and the trapezoidal groove frame (4) is provided with a receiving cylinder (5) between the heating rotating roller (3) in the middle, and the receiving cylinder (5) is located on the lower side of the heating rotating roller (3) in the middle after rising; Film guide assembly, the receiving cylinder (5) is rotationally arranged with the film guide assembly, so that the excess polylactic acid film moves along the center point of the heating rotating roller (3) in the middle; Film winding structure, the casting machine device (1) is provided with the film winding structure for winding the polylactic acid film after forming.

2. The ultra-low grammage PLA laminated paper production equipment according to claim 1, characterized in that, The inner bottom wall of the trapezoidal groove frame (4) is provided with a first electric cylinder (6) on both sides, the output end of the first electric cylinder (6) is fixedly connected with the bottom of the receiving cylinder (5), and the receiving cylinder (5) is driven to rise and fall.

3. The ultra-low grammage PLA laminated paper production equipment according to claim 2, characterized in that, Both sides of the receiving cylinder (5) are provided with rotating areas, the rotating ring frame (7) is fixedly connected in the two rotating areas, and the driving rotating ring (8) is rotationally connected in the rotating ring frame (7).

4. The ultra-low grammage PLA laminated paper production equipment according to claim 3, characterized in that, The film guide assembly comprises: Bent connecting piece (9), the driving rotating ring (8) on both sides is fixedly connected with the bent connecting piece (9); Guide roller (10), the guide roller (10) is rotationally connected between the two bent connecting pieces (9); Wherein, after the receiving cylinder (5) rises, the guide roller (10) extrudes the polylactic acid film and is attached to the heating rotating roller (3) in the middle, and with the rotation of the driving rotating ring (8), the guide roller (10) is driven to one side close to the film winding structure.

5. The ultra-low grammage PLA laminated paper production equipment according to claim 4, characterized in that, Also include: Lifting groove frame (11), the trapezoidal groove frame (4) is longitudinally movably provided with the lifting groove frame (11); Supporting roller (12), the lifting groove frame (11) is rotationally connected with the supporting roller (12), after the guide roller (10) moves to one side of the film winding structure, the lifting groove frame (11) rises, and drives the supporting roller (12) to support the polylactic acid film and contact the bottom side of the heating rotating roller (3) in the middle.

6. The ultra-low grammage PLA laminated paper production equipment according to claim 5, characterized in that, The middle part of the receiving cylinder (5) is provided with a through groove, and the middle part of the trapezoidal groove frame (4) is provided with a second electric cylinder (13) for driving the lifting groove frame (11) to move longitudinally.

7. The ultra-low grammage PLA laminated paper production equipment according to claim 6, characterized in that, The bottom side of the receiving cylinder (5) is provided with a first driving motor (14), and the first driving motor (14) is matched with the driving rotating ring (8) on the same side through a transmission gear (19).

8. The ultra-low grammage PLA laminated paper production equipment according to claim 7, characterized in that, The film winding structure comprises: Winding groove frame (15), the winding groove frame (15) is arranged on the casting machine device (1); Winding rotating cylinder (16), the winding rotating cylinder (16) is rotationally connected in the winding groove frame (15).

9. The ultra-low grammage PLA laminated paper production equipment according to claim 8, characterized in that, The top of the winding groove frame (15) is slidably connected with a cutting tool (17), and the side wall of the winding drum (16) is circumferentially provided with a plurality of abutting grooves (18) corresponding to the cutting tool (17).

10. A production process of ultra-low grammage PLA laminated paper, using the production equipment of ultra-low grammage PLA laminated paper according to claim 9, characterized in that, The method comprises the following steps: Step one, produce film-coated paper: drive the paper to move on the hot press device (2), and discharge the polylactic acid raw material from the casting machine device (1) in the form of a film, so that the polylactic acid film is attached to the paper, and the temperature of the plurality of heating rollers (3) is used to form the PLA film-coated paper; Step two, discharge the excess material: move the position of the guide roller (10) to the bottom near the discharge end of the casting machine device (1), and the casting machine device (1) continues to discharge the polylactic acid film; Step three, guide the film: the polylactic acid film moves between the guide roller (10) and the heating roller (3) located in the middle side, and the polylactic acid film is formed by the heating roller (3) located in the middle side, and then the circumferential position of the guide roller (10) is adjusted to guide the polylactic acid film to one side near the winding drum (16); Step four, support the film: drive the lifting groove frame (11) to rise, so that the supporting roller (12) drives the polylactic acid film to be attached to the bottom side of the heating roller (3) located in the middle side; Step five, wind the film: use the winding drum (16) to wind the polylactic acid film until the polylactic acid raw material in the casting machine device (1) is discharged; Step six, cut the film: drive the cutting tool (17) to cut the wound polylactic acid film into a sheet shape; Step seven, change the material for production: replace the corresponding paper and polylactic acid raw material, and continue to produce the PLA film-coated paper. ​ ​ ​ ​ ​ ​

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