Degradable plastic-free paper bag and production equipment thereof

Abstract

The application discloses a degradable plastic-free paper bag and a production equipment thereof, and relates to the field of paper bags, which comprises a paper bag body, the paper bag body comprises a modified starch-based waterproof agent, kraft paper and a PP synthetic paper core, and the middle part of the paper bag body is provided with movable paper boards on both sides through Z-shaped plastic films; glue grooves are arranged between the lower end of the movable paper board and the surface of the paper bag body, the Z-shaped plastic film is provided with a longitudinal cutout three on one side, and the plastic film is provided with a corner two longitudinal cutout and a corner one longitudinal cutout at the corner of the paper bag body. The movable movable paper board can fill the pre-folding corner between the paper bag body and the gap on the surface of the paper bag body, and the glue discharged from the corner one longitudinal cutout and the corner two longitudinal cutout can further fill the gap and achieve the effect of sticking and fixing, so that the sealing performance of the paper bag body is improved.

Description

Technical Field

[0001] This application relates to the field of paper bags, and more particularly to a biodegradable plastic-free paper bag and its production equipment. Background Technology

[0002] Envelope paper bags, as the name suggests, are paper bags made of paper used to hold letters or small items. Their shape and size are usually similar to traditional envelopes. These paper bags not only protect the contents but are also a popular packaging choice due to their material and customizability. Envelope paper bags are typically designed to be simple and practical, with one or more openings for inserting and removing items. Some envelope paper bags also come with sealing strips or adhesives to ensure the safety and privacy of the contents. Furthermore, they can be customized to add brand logos, company information, or special designs to enhance brand image and promotional effectiveness.

[0003] For example, the environmentally friendly biodegradable envelope paper bag described in application number CN202321494802.3 still has the following shortcomings in actual use: The paper bag is sealed by gluing the opening of the envelope with an adhesive layer. However, there are buttresses on both sides of the middle of the paper bag, which causes the paper bag to have different thicknesses in the closed area. This results in unstable adhesive bonding and voids at the thicker stacking points and the thinner joints, thus reducing the overall sealing performance of the paper bag. At the same time, the adhesive layer of the paper bag has many folds, making it inconvenient to use release paper as a barrier. Summary of the Invention

[0004] To improve the problem of poor sealing of paper bags, this application provides a biodegradable plastic-free paper bag and its production equipment.

[0005] The technical solution for the biodegradable plastic-free paper bag and its production equipment provided in this application is as follows: A biodegradable plastic-free paper bag includes a paper bag body, which comprises a modified starch-based waterproofing agent, kraft paper, and a PP synthetic paper core. The two openings in the middle of the paper bag body are each fixed with a movable cardboard through a Z-shaped plastic film. The movable cardboard is made of the same material as the paper bag body. The lower end of the movable cardboard is provided with an interconnected glue groove between it and the surface of the paper bag body. The surface of the glue groove is provided with a plastic film that is fixed to the surface of the paper bag body. The plastic film has a longitudinal cut three on one side of the Z-shaped plastic film. The plastic film has a second longitudinal cut and a first longitudinal cut at the corner of the paper bag body.

[0006] By adopting the above technical solution, multiple pre-folded corners are set to fill more glue. At the same time, the gap between the two folded corners and the longitudinal cut can be filled by moving the cardboard, thereby increasing the sealing of the paper bag body. The Z-shaped plastic film has flexibility and sealing properties, which can adapt well to the movement of the moving cardboard and also play a sealing role.

[0007] Preferably, the PP synthetic paper core is fixed to kraft paper on both sides, and one side of the two kraft paper surfaces is fixed to a modified starch-based waterproofing agent. The outer surface of the movable cardboard is fixed with protrusions at positions opposite to the glue tank, and ant lines are provided in the middle of the surface of the plastic film.

[0008] By adopting the above technical solution, the protrusions facilitate the sealing of the paper bag body and increase the effect of glue being squeezed out of the glue tank. The ant line design facilitates the discharge of glue inside the glue tank and also plays a role in isolating glue during storage.

[0009] A production equipment for biodegradable plastic-free paper bags includes an equipment frame set on the ground, a plurality of drive rollers are set on the upper end of the equipment frame, and cardboard is set on the upper end of the plurality of drive rollers, and the cardboard is folded into the main body of the paper bag; The equipment frame is provided with longitudinal adjustment structures on both sides, and a glue injection mechanism for glue injection is provided between the two longitudinal adjustment structures. Positioning components that work in conjunction with the glue injection mechanism are provided on one side of the equipment frame located on the glue injection mechanism.

[0010] By adopting the above technical solution, the glue injection mechanism and the positioning component work together to fill the glue tank with glue and effectively cut the plastic film at the designated position as needed, which facilitates the storage and sealing of items by the paper bag body and also facilitates the discharge of glue from the glue tank.

[0011] Preferably, the longitudinal adjustment structure includes fixed frames fixed on both sides of the outer surface of the equipment frame, and a movable plate is slidably arranged in the middle of each of the two fixed frames. Each movable plate has a screw threaded at one end, which is rotatably arranged with the movable plate. The lower end of the screw is limited to the movable plate.

[0012] By adopting the above technical solution, the moving plate can be moved longitudinally within the fixed frame by rotating the screw, thereby adjusting the height between the glue injection tube and the upper end face of the drive roller, and thus adjusting in real time according to the paper bag body of different thicknesses.

[0013] Preferably, the glue injection mechanism includes a connecting plate fixed between two movable plates. A linear drive mechanism is fixed on one side of the paper bag body of the connecting plate. An intermediate frame is fixed on the movable end of the linear drive mechanism. A glue injection tube is fixed on one end of the intermediate frame and inserted into the glue tank to realize glue injection. A cutter for cutting plastic film is rotatably provided at the glue outlet end of the glue injection tube. The upper end of the cutter is set as a cutting edge.

[0014] By adopting the above technical solution, the width of the glue injection tube is smaller than the width of the glue tank, thus enabling smooth insertion. At the same time, the cutter extends downwards to a certain distance at its lower end under normal conditions. This protrusion can scrape the discharged glue flat, thus preventing the glue from directly contacting the surface of the plastic film and maintaining a certain distance, making the glue more flat and aesthetically pleasing.

[0015] Preferably, a partition is fixedly provided in the upper middle part of the dispensing tube, and the partition divides the inner cavity of the dispensing tube into an equipment cavity and a dispensing cavity.

[0016] By adopting the above technical solution, the dispensing chamber can transport and discharge adhesives of different viscosities, while the equipment cavity can isolate the adhesive.

[0017] Preferably, a fixing plate is fixedly provided at the upper end of the partition plate on one side of the cutter, and a cylinder fixedly connected to one side of the cutter is movably passed through one side of the fixing plate. A spiral groove is provided on the surface of the cylinder, and a second pull rod is movably passed through the other side. A connecting ball that slides inside the spiral groove is fixedly provided on one end of the cutter and on the side facing the cylinder.

[0018] By adopting the above technical solution, the fixed plate plays a supporting role, while the connecting ball drives the cylinder to rotate, thus converting linear motion into rotational motion. Therefore, it is necessary to set the spiral of the spiral groove to achieve rotational capability.

[0019] Preferably, the upper end of the dispensing tube away from the cutter has a rectangular opening communicating with the equipment cavity. L-shaped frames fixed to the surface of the dispensing tube are provided on both sides of the upper end of the rectangular opening. A movable plate two is rotatably provided in the middle of the L-shaped frame and rotatably provided with one end of the pull rod two. The lower end of the movable plate two passes through the rectangular opening and is located inside the equipment cavity. The dispensing tube is fixed to one side of the movable plate two and has a glue inlet tube communicating with the dispensing cavity.

[0020] By adopting the above technical solution, the rectangular opening avoids interference with the glue injection tube when the movable plate 2 rotates, which would cause the movable plate 2 to rotate at the wrong angle. Under the action of the rotating shafts on both sides of the movable plate 2, lever movement can be realized, thereby enabling the pull rod 1 and pull rod 2 to move in opposite directions.

[0021] Preferably, a movable plate is rotatably disposed on the side of the L-shaped frame away from the movable plate two, and a pull rod is rotatably disposed between the lower end of the movable plate and the upper end of the movable plate two, and the L-shaped frame is located on the upper part of the plastic film.

[0022] By adopting the above technical solution, both tie rod one and tie rod two can achieve the function of force transmission.

[0023] Preferably, the positioning component includes a U-shaped frame fixed on both sides of the equipment frame, and the surface of the U-shaped frame is provided with a plurality of limiting components for cutting and positioning the plastic film. The limiting component includes a U-shaped bracket inserted into the U-shaped frame. The upper end of the U-shaped bracket is fixed to the U-shaped frame by fastening screws. A connecting bracket is fixed on one side of the U-shaped bracket located on the glue injection mechanism. A connecting shaft is fixedly inserted through the lower side of the lower end of the connecting bracket. A baffle adapted to the movable plate is inserted and fixed in the middle of the connecting shaft. Torsion springs that are fixed to the connecting bracket and the surface of the baffle are sleeved on both ends of the connecting shaft.

[0024] By adopting the above technical solution, the lower end of the baffle is set with a rounded chamfer, the torsion spring can restore the baffle to its original vertical state while increasing resistance, and the fastening nut can fix the U-shaped frame at any position of the U-shaped frame.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The use of modified starch-based waterproofing agent can effectively improve the waterproof effect of the paper bag body. The movable cardboard can fill the gaps between the pre-folded corners of the paper bag body and the gaps between the cardboard body and the surface of the paper bag body. At the same time, the glue discharged from the first longitudinal cut of the folded corner and the second longitudinal cut of the folded corner further fills the gaps and achieves the effect of adhesion and fixation, thereby improving the sealing of the paper bag body and preventing water from entering the paper bag body and oxidation of the contents inside. 2. The position of the glue injection mechanism is adjusted by the longitudinal adjustment structure to fill the paper bag body with glue of different thicknesses. The glue injection mechanism and the positioning component work together to enable the cutter to quickly cut the plastic film surface at the required cutting position, thereby improving the cutting effect of the plastic film, increasing work efficiency and facilitating the production of the paper bag body. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the paper bag in this application; Figure 2 This is a schematic cross-sectional view of the side wall of the paper bag in this application; Figure 3 This is a schematic diagram of the overall paper bag production equipment according to Embodiment 2 of this application; Figure 4 This is a schematic diagram of the connection between the glue tank and the glue injection tube in this application; Figure 5 This is a schematic diagram showing the contact between the limiting component and the active plate in this application; Figure 6 This is a schematic diagram of the limiting component structure in this application; Figure 7 This is a schematic diagram showing the connection between the glue dispensing mechanism, the linear drive mechanism, and the longitudinal adjustment structure in this application; Figure 8This is a schematic diagram showing the connection of the tie rod 1, the L-shaped frame, and the movable plate 2 in this application; Figure 9 This is a cross-sectional view of the dispensing tube in this application; Figure 10 This is a schematic diagram showing the connection between the dispensing tube and the cutter in this application; Figure 11 This is a cross-sectional view of the cylinder and spiral groove connection inside the dispensing tube of this application.

[0027] Figure reference numerals: 100, paper bag body; 101, modified starch-based waterproofing agent; 102, plastic film; 103, ants' trail; 104, first longitudinal slit at the fold; 105, second longitudinal slit at the fold; 106, third longitudinal slit; 107, glue groove; 108, kraft paper; 109, PP synthetic paper core; 110, movable cardboard; 111, Z-shaped plastic film; 112, protrusion; 200. Equipment frame; 300. Drive roller; 400. Longitudinal adjustment structure; 401. Moving plate; 402. Fixing frame; 403. Screw; 500. Glue injection mechanism; 501. Connecting plate; 502. Linear drive mechanism; 503. Intermediate frame; 504. Glue injection tube; 505. L-shaped frame; 506. Movable plate one; 507. Tie rod one; 508. Movable plate two; 509. Rectangular opening; 510. Equipment cavity; 511. Partition plate; 512. Glue injection cavity; 513. Tie rod two; 514. Blade edge; 515. Fixing plate; 516. Cylinder; 517. Spiral groove; 518. Connecting ball; 519. Cutting knife; 600. Positioning components; 601, Limiting component; 6011, Fastening screw; 6012, Connecting bracket; 6013, Baffle; 6014, Connecting shaft; 6015, U-shaped bracket; 6016, Torsion spring; 700, Inlet tube. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-11 This application will be described in further detail.

[0029] Example 1 This application discloses a biodegradable plastic-free paper bag and its production equipment.

[0030] Reference Figure 1 , Figure 2A biodegradable plastic-free paper bag includes a paper bag body 100, which comprises a modified starch-based waterproofing agent 101, kraft paper 108, and a PP synthetic paper core 109. Two symmetrical openings are formed on both sides of the middle portion of the paper bag body 100. The two sides of the openings are fixed to one side of a Z-shaped plastic film 111, and the other side of the Z-shaped plastic film 111 is fixed to one side of a movable cardboard 110. A protrusion 112 is fixed to the outer surface of the movable cardboard 110 relative to a glue groove 107. The protrusion 112 is a long strip of cardboard. It should be noted that the Z-shaped plastic film 111 is actually fixed to the surface of the modified starch-based waterproofing agent 101. The flexibility of the Z-shaped plastic film 111 allows the movable cardboard 110 to move while maintaining the airtightness of the paper bag interior. The material composition and structure of the movable cardboard 110 are the same as those of the paper bag body 100. Glue grooves 107 are formed between the lower end of the movable cardboard 110 and the surface of the paper bag body 100. Two glue tanks 107 are interconnected and have the same size. A plastic film 102 is provided on the opening surface of the glue tank 107 and both ends of the plastic film 102 are fixed to the paper bag body 100. The plastic film 102 is preferably a biodegradable polylactic acid (PLA), polybutylene succinate (PBS), etc. The plastic film 102 is located on one side of the Z-shaped plastic film 111, and a longitudinal cut 3 106 is opened at the corresponding position of the Z-shaped plastic film 111. The length of the longitudinal cut 3 106 is the same as the length of the Z-shaped plastic film 111.

[0031] When sealing the paper bag, the user presses the protrusion 112 with their hand. The protrusion 112 will move the movable cardboard 110, thereby squeezing the glue inside the modified starch-based waterproofing agent 101. At the same time, it will cause the Z-shaped plastic film 111 to deform, making the two movable cardboards 110 stick together more tightly. It should be noted that the length of the movable cardboard 110 is the same as the distance between the folded corners of the two paper bag bodies 100, so as to achieve a perfect fit. The kraft paper 108, PP synthetic paper core 109 and modified starch-based waterproofing agent 101 can make the paper bag have better toughness and waterproof effect.

[0032] Reference Figure 1 , Figure 2 The plastic film 102 has a double longitudinal slit 105 at the inward fold of the paper bag body 100, and a single longitudinal slit 104 at the outward fold of the paper bag body 100 to prevent the plastic film 102 from being stretched and squeezed during bending, which would cause the glue inside the glue tank 107 to be squeezed. The two sides of the PP synthetic paper core 109 are fixed to one side of the kraft paper 108. One side of the surface of the two kraft papers 108 is fixed to one side of the modified starch-based waterproofing agent 101. The modified starch-based waterproofing agent 101 has a waterproof effect, thereby increasing the waterproofness of the paper bag. The Z-shaped plastic film 111 is set as a "U" shape. The middle of the surface of the plastic film 102 is provided with ant lines 103 corresponding to the middle of the glue tank 107. The ant lines 103 connect the outside to the inside of the glue tank 107.

[0033] When the glue tank 107 is squeezed, the glue inside the glue tank 107 will leak out from the ant line 103. At the same time, the ant line 103 will prevent the glue from leaking out of the glue tank 107 during daily storage and transportation, thus achieving a sealing effect. When the positive and negative folds of the paper bag body 100 are folded, the glue inside the glue tank 107 will also be discharged from the second longitudinal cut 105 and the first longitudinal cut 104 of the fold, thereby increasing the amount of glue and filling the gap between the positive fold of the paper bag body 100 and the moving cardboard 110, so that the glue can solidify and achieve a sealing effect. It should be noted that the glue needs to be set to maintain its stickiness for a long time and not be oxidized, while maintaining a certain liquid state. Therefore, the glue formula needs to be improved. Since it is not the main technology, this patent will not describe it in detail.

[0034] Meanwhile, a height limit line is set on the outer side of the paper bag body 100, such as... Figure 1 As shown, the documents inside the paper bag body 100 must not be higher than the height limit line, otherwise they will come into contact with the glue and cause damage to the items.

[0035] The implementation principle of a biodegradable plastic-free paper bag in this application embodiment is as follows: by pressing the protrusion 112 and the position corresponding to the glue groove 107 on the outside of the paper bag body 100, the glue is discharged from the inside of the glue groove 107. At this time, the paper bag body 100 is folded, and the movable cardboard 110 is located between the two convex corners of the paper bag body 100. At the same time, the glue is discharged from the longitudinal cut 104 of the fold corner to fill the gap between the movable cardboard 110 and the convex corner of the paper bag body 100, thereby improving the sealing of the paper bag and achieving full sealing. This effectively increases the storage time of the items and avoids them from being rapidly oxidized by prolonged contact with air.

[0036] Example 2 Please refer to Figure 3 A production equipment for biodegradable plastic-free paper bags is provided for producing such biodegradable plastic-free paper bags. The equipment includes a frame 200 fixedly installed on the ground. Several drive rollers 300 are rotatably installed on the upper part of the frame 200. Both the frame 200 and the drive rollers 300 are existing products. Each drive roller 300 rotates synchronously, thereby driving the paper bag body 100 to move. Cardboard is placed on the upper part of the drive rollers 300, and the cardboard can be folded into the paper bag body 100 in subsequent operations.

[0037] The device is also equipped with a vision camera, which can take pictures of the position of the glue tank 107 of the paper bag body 100 so that when the glue tank 107 moves to be opposite the glue injection tube 504, the multiple drive rollers 300 stop working, thereby making it easier for the glue injection tube 504 to be inserted into the glue tank 107.

[0038] Please refer to Figures 3-6Two symmetrical longitudinal adjustment structures 400 are provided on both sides of the middle part of the equipment frame 200. The longitudinal adjustment structure 400 includes a fixed frame 402 fixed on both sides of the outer surface of the equipment frame 200. The upper middle part of the two fixed frames 402 is provided with a sliding groove. A movable plate 401 is slidably arranged in the sliding groove in the middle of the two fixed frames 402. A screw 403 is threadedly provided at the middle of one end of each movable plate 401. The lower end of the screw 403 is rotatably set with the inner wall of the movable plate 401 and achieves limit. At the same time, a fastening nut is threaded between the upper end of the screw 403 and the movable plate 401.

[0039] The user can adjust the longitudinal adjustment structure 400 according to the thickness of the paper bag body 100, so that the glue injection tube 504 can be smoothly inserted into the glue tank 107. When adjusting the height, the user rotates the screw 403 by hand, which drives the moving plate 401 to adjust the longitudinal height under the action of the thread. Then, the linear drive mechanism 502 drives the intermediate frame 503 to move, which in turn drives the glue injection tube 504 to adjust the height. When one end of the glue injection tube 504 corresponds to one end of the glue tank 107, the user then uses a wrench to rotate the fastening nut to fix the screw 403, so as to prevent its rotation from affecting the height of the glue injection tube 504.

[0040] Please refer to Figures 6-11 A glue injection mechanism 500 is provided between the two longitudinal adjustment structures 400 for injecting glue into the glue groove 107 on the surface of the paper bag body 100. The glue injection mechanism 500 includes a connecting plate 501 fixed between the two moving plates 401. The connecting plate 501 is located on one side of the paper bag body 100 and is fixed to the fixed end of the linear drive mechanism 502 by bolts. The movable end of the linear drive mechanism 502 is fixed to one end of the intermediate frame 503 by bolts. The linear drive mechanism 502 is set in a horizontal state. One end of the intermediate frame 503... A glue injection tube 504 is fixedly provided in the glue tank 107. The glue injection tube 504 is movably inserted into the glue tank 107 and performs glue injection, thereby injecting glue into the glue tank 107 and between the plastic film 102. A cutter 519 is rotatably provided at the glue outlet end of the glue injection tube 504. The upper end of the cutter 519 is provided with a cutting edge 514. The cutting edge 514 on the surface of the cutter 519 cuts the plastic film 102. The lower end of the cutter 519 extends to the lower end of the partition 511 and part of it is located in the lateral extension space of the glue injection cavity 512, thereby achieving the effect of scraping the glue.

[0041] When one end of the dispensing tube 504 corresponds to one end of the glue tank 107, the microcomputer-controlled linear drive mechanism 502 is powered on. The movable end of the linear drive mechanism 502 drives the intermediate frame 503 to move, thereby driving the dispensing tube 504 to be inserted into the glue tank 107, so that the end of the dispensing tube 504 moves to one end of the glue tank 107. It should be noted that the surface of the cutter 519 is flush with the surface of the dispensing tube 504 to avoid interference with the inner wall of the glue tank 107.

[0042] Please refer to Figures 6-11 The upper and middle sides of the inner cavity of the glue injection tube 504 are fixed to the two sides of the partition plate 511. The partition plate 511 divides the inner cavity of the glue injection tube 504 into an equipment cavity 510 in the upper part and a glue injection cavity 512 in the lower part. A fixing plate 515 is fixedly installed at the middle of the upper end of the partition plate 511 on one side of the cutter 519. A cylinder 516 is movably inserted through one side of the fixing plate 515. One end of the central axis of the cylinder 516 is fixedly connected to one side of the cutter 519. It should be noted that one end of the central axis of the cylinder 516 is located at one-third of the surface of the cutter 519. The cutter 519 rotates eccentrically to cut the plastic film 102. The central axis of the cylinder 516 is rotatably mounted to the fixed plate 515 via bearings. A spiral groove 517 is formed on the surface of the cylinder 516. The large-angle spiral of the spiral groove 517 allows the connecting ball 518 to smoothly drive the cylinder 516 to rotate. A circular hole is formed on the other side of the fixed plate 515, through which a second pull rod 513 moves. A connecting ball 518, which slides inside the spiral groove 517, is fixed to one end of the pull rod 513 at the cutter 519. Body 518 is located on one side of cylinder 516. A rectangular opening 509 is provided at the upper end of the side of the glue injection tube 504 away from the cutter 519. The rectangular opening 509 communicates with the equipment cavity 510. The length of the rectangular opening 509 is much larger than the rotation radius of the second movable plate 508. L-shaped frames 505 are provided on both sides of the upper end of the rectangular opening 509. One end of the L-shaped frame 505 is fixed to the surface of the glue injection tube 504. The second movable plate 508 is rotatably mounted in the middle of the L-shaped frame 505. One end of the second movable plate 508 is rotatably mounted to one end of the second pull rod 513 via a rotating shaft. The lower part of the second movable plate 508... The end passes through the rectangular opening 509, and the rotating shaft of the second movable plate 508 and the second pull rod 513 are located inside the equipment cavity 510. The glue injection tube 504 is located on one side of the second movable plate 508 and is fixedly connected to the glue injection cavity 512 to realize glue delivery. The end of the L-shaped frame 505 away from the second movable plate 508 is rotatably provided with the first movable plate 506. The lower end of the first movable plate 506 and the upper end of the second movable plate 508 are both rotatably provided with the first pull rod 507 through the rotating shaft. The L-shaped frame 505 is located on the upper part of the plastic film 102.

[0043] The upper end of movable plate 506, when subjected to force, rotates around its pivot point, causing pull rod 507 to move. Pull rod 507, via the upper pivot of movable plate 508, rotates movable plate 508 on the L-shaped frame 505, thus, through the lever principle, moving pull rod 513 towards the cutter 519. At this time, the fixed plate 515 provides support for pull rod 513 and the cylinder 516. Subsequently, pull rod 513... The connecting ball 518 moves, causing it to slide within the spiral groove 517 of the cylinder 516. This spiral groove 517 then restricts the rotation of the cylinder 516. It's important to note that when the connecting ball 518 moves from one end of the cylinder 516 to the other, the cutter 519 rotates under the drive of the central axis of the cylinder 516. The cutting edge 514 at the upper end of the cutter 519 can cut the plastic film 102, thus facilitating the pre-folding of the paper bag body 100. Because the cutter 519 and the fixing plate 515 are eccentrically positioned during rotation, one end of the cutter 519 will not interfere with the partition plate 511, thus preventing interference with the rotation of the cutter 519.

[0044] Please refer to Figures 10-11 On both sides of the equipment frame 200, located on one side of the glue injection mechanism 500, positioning components 600 are provided to cooperate with the glue injection mechanism 500. Each positioning component 600 includes a U-shaped frame fixed on both sides of the equipment frame 200 near the glue injection mechanism 500. The surface of the U-shaped frame is provided with multiple limiting components 601 for cutting and positioning the plastic film 102. These limiting components 601 are set according to the pre-folded angle position of the paper bag body 100 to achieve cutting of the plastic film 102. Each limiting component 601 includes a U-shaped frame 6015 movably inserted into the U-shaped frame. The upper end of the U-shaped frame 6015 is threaded with... Fastening screw 6011, the lower end of fastening screw 6011 abuts against the upper part of U-shaped frame and fixes U-shaped frame 6015 to U-shaped frame. U-shaped frame 6015 is located on one side of glue injection mechanism 500 and is integrally formed with connecting frame 6012. A circular connecting shaft 6014 is fixedly inserted through the lower side of the lower end of connecting frame 6012. A baffle 6013 is inserted and fixed in the middle of connecting shaft 6014. Baffle 6013 is adapted to movable plate 506. Torsion springs 6016 are sleeved on both ends of connecting shaft 6014. The two ends of torsion springs 6016 are fixed to the surface of connecting frame 6012 and baffle 6013 respectively.

[0045] The user determines the cutting positions of the first longitudinal cut 104, the second longitudinal cut 105, and the third longitudinal cut 106 based on the shape of the paper bag body 100. Then, the positions of the three limiting components 601 are respectively aligned with the positions of the first longitudinal cut 104, the second longitudinal cut 105, and the third longitudinal cut 106. The U-shaped frame 6015 is then fixed to the U-shaped frame using fastening screws 6011. External glue-dispensing equipment injects the prepared glue into the glue-dispensing chamber 512 through the glue inlet pipe 700. The glue accumulates in the glue-dispensing chamber 512 and is discharged from the port of the glue-dispensing pipe 504, thus transporting the glue to the glue tank 107 and the plastic film 102. When the movable plate 506 abuts against the lower end of the baffle 6013, due to the continuous flow of the glue-dispensing pipe 504... The movement of the movable plate 506 causes it to rotate under the constraint of the baffle 6013. Simultaneously, the baffle 6013, pushed by the movable plate 506, also rotates around the connecting shaft 6014, thus torsioning the torsion spring 6016. As the baffle 6013 rotates, it continuously pushes the movable plate 506, allowing the cutter 519 to rotate continuously to 80-90 degrees. Therefore, the torsional resistance of the torsion spring 6016 needs to be adjusted. When the baffle 6013 separates from the movable plate 506, the heavier end of the cutter 519 will return to its original position, while the baffle 6013, under the reaction force of the torsion spring 6016, will return to its original vertical state.

[0046] The working principle and process of this embodiment: The user needs to adjust the longitudinal adjustment structure 400 according to the thickness of the paper bag body 100. When the external camera detects that the paper bag body 100 has moved to the appropriate position, the drive roller 300 stops working. The microcomputer controls the linear drive mechanism 502 to work, which in turn drives the glue injection tube 504 to slowly insert into the glue tank 107 and into one end of the paper bag body 100. Subsequently, the external glue pump works to deliver glue through the glue inlet tube 700 to the glue injection chamber 512 and then to the glue tank 107. At this time, the connecting plate 501 drives the glue injection tube 504 to slowly pull out from the inside of the glue tank 107.

[0047] When the movable plate 506 contacts the baffle 6013 and rotates, it drives the movable plate 506 to rotate, which in turn drives the pull rod 507 to move, causing the movable plate 508 to rotate. At the same time, it drives the pull rod 513 to move in the opposite direction to the pull rod 507, which in turn drives the connecting ball 518 to rotate, which in turn drives the cylinder 516 to rotate. The cylinder 516 drives the cutter 519 to rotate, which then cuts the plastic film 102 through the cutting edge 514.

[0048] The limiting components 601 at different positions drive the cutter 519 to rotate and cut the paper bag body 100 at the following positions: the first longitudinal cut 104, the second longitudinal cut 105, and the third longitudinal cut 106. This design allows for structural design and operation during the production of the paper bag body 100, resulting in a better seal and preventing air leakage when storing items. Furthermore, the device is more convenient to operate, allowing for one-time molding of the paper bag body 100 during manufacturing, effectively improving the device's efficiency.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A biodegradable plastic-free paper bag, characterized in that: The paper bag body (100) includes a modified starch-based waterproofing agent (101), kraft paper (108), and a PP synthetic paper core (109). The paper bag body (100) has two openings on the middle side, each of which is fixed with a movable cardboard (110) by a Z-shaped plastic film (111). The movable cardboard (110) is made of the same material as the paper bag body (100). The lower end of the movable cardboard (110) and the surface of the paper bag body (100) are provided with interconnected glue grooves (107). The surface of the glue grooves (107) is provided with plastic film (102) fixed to the surface of the paper bag body (100). The plastic film (102) is provided with a longitudinal cut three (106) on one side of the Z-shaped plastic film (111). The plastic film (102) is provided with a second longitudinal cut (105) and a first longitudinal cut (104) at the fold of the paper bag body (100).

2. The biodegradable plastic-free paper bag according to claim 1, characterized in that: The PP synthetic paper core (109) is fixed to the kraft paper (108) on both sides, and the two kraft paper (108) are fixed to one side of the surface with the modified starch-based waterproofing agent (101). The outer surface of the movable cardboard (110) is fixed with a protrusion (112) at a position opposite to the glue tank (107). The middle part of the surface of the plastic film (102) is provided with ant lines (103).

3. A production equipment for biodegradable plastic-free paper bags, characterized in that: The device for producing a biodegradable plastic-free paper bag as described in claim 2 includes a device frame (200) set on the upper part of the ground, a plurality of drive rollers (300) are provided on the upper part of the device frame (200), and cardboard is provided on the upper part of the plurality of drive rollers (300), and the cardboard is folded into a paper bag body (100). The equipment frame (200) is provided with longitudinal adjustment structures (400) on both sides, and a glue injection mechanism (500) for glue injection is provided between the two longitudinal adjustment structures (400). The equipment frame (200) is provided with positioning components (600) on one side of the glue injection mechanism (500) to cooperate with the glue injection mechanism (500).

4. The production equipment for biodegradable plastic-free paper bags according to claim 3, characterized in that: The longitudinal adjustment structure (400) includes a fixed frame (402) fixed on both sides of the outer surface of the equipment frame (200). A movable plate (401) is slidably arranged in the middle of each of the two fixed frames (402). A screw (403) is threaded at one end of each movable plate (401) and rotates with the movable plate (401). The lower end of the screw (403) is limited to the movable plate (401).

5. The production equipment for biodegradable plastic-free paper bags according to claim 4, characterized in that: The glue injection mechanism (500) includes a connecting plate (501) fixed between two movable plates (401). The connecting plate (501) is located on one side of the paper bag body (100) and a linear drive mechanism (502) is fixed thereon. The movable end of the linear drive mechanism (502) is fixed with an intermediate frame (503). One end of the intermediate frame (503) is fixed with a glue injection tube (504) that is inserted into the glue tank (107) and performs glue injection. The glue outlet end of the glue injection tube (504) is rotatably equipped with a cutter (519) for cutting the plastic film (102). The upper end of the cutter (519) is set with a cutting edge (514).

6. The production equipment for biodegradable plastic-free paper bags according to claim 5, characterized in that: A partition (511) is fixedly provided in the upper middle part of the glue injection tube (504). The partition (511) divides the inner cavity of the glue injection tube (504) into an equipment cavity (510) and a glue injection cavity (512).

7. The production equipment for biodegradable plastic-free paper bags according to claim 6, characterized in that: A fixing plate (515) is fixedly provided on the upper end of the partition plate (511) on one side of the cutter (519). A cylinder (516) fixedly connected to one side of the cutter (519) is movably passed through one side of the fixing plate (515). A spiral groove (517) is opened on the surface of the cylinder (516). A pull rod (513) is movably passed through the other side. A connecting ball (518) that slides inside the spiral groove (517) is fixedly provided on one end of the cutter (519) and on the side facing the cylinder (516).

8. The production equipment for biodegradable plastic-free paper bags according to claim 7, characterized in that: The upper end of the glue injection tube (504) away from the cutter (519) is provided with a rectangular opening (509) that communicates with the equipment cavity (510). On both sides of the upper end of the rectangular opening (509), there are L-shaped frames (505) fixed to the surface of the glue injection tube (504). The middle part of the L-shaped frame (505) is rotatably provided with a movable plate (508) that is rotatably provided with one end of the pull rod (513). The lower end of the movable plate (508) passes through the rectangular opening (509) and is located inside the equipment cavity (510). The glue injection tube (504) is fixed to one side of the movable plate (508) and communicates with the glue injection cavity (512).

9. The production equipment for biodegradable plastic-free paper bags according to claim 8, characterized in that: The L-shaped frame (505) is rotatably provided with a movable plate (506) on the side away from the movable plate two (508). A pull rod (507) is rotatably provided between the lower end of the movable plate one (506) and the upper end of the movable plate two (508). The L-shaped frame (505) is located on the upper part of the plastic film (102).

10. The production equipment for biodegradable plastic-free paper bags according to claim 3, characterized in that: The positioning component (600) includes a U-shaped frame fixed on both sides of the equipment frame (200), and the surface of the U-shaped frame is provided with a plurality of limiting components (601) for cutting and positioning the plastic film (102). The limiting component (601) includes a U-shaped frame (6015) inserted into the U-shaped frame. The upper end of the U-shaped frame (6015) is fixed to the U-shaped frame by fastening screws (6011). The U-shaped frame (6015) is fixed to a connecting frame (6012) on one side of the glue injection mechanism (500). The lower end of the connecting frame (6012) is fixedly connected to a connecting shaft (6014). The middle part of the connecting shaft (6014) is fixedly connected to a baffle (6013) that is adapted to the movable plate (506). The two ends of the connecting shaft (6014) are fitted with torsion springs (6016) that are fixed to the surface of the connecting frame (6012) and the baffle (6013).

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