Preparation method of highly waterproof paper-plastic composite bag

Abstract

The invention relates to a high-waterproof paper-plastic composite bag preparation method which comprises a cutter and a rotary chain, pressing plates are arranged on the two sides of the cutter in a sliding mode, a smoothing plate is arranged below the pressing plates in a sliding mode, a bearing plate is arranged below the cutter in a sliding mode, and in the descending process of the cutter, the pressing plates and the bearing plate clamp a composite bag and move towards the two sides; a plurality of fixing plates are arranged on the rotary chain, a plurality of adsorption holes are formed in the fixing plates, overturning plates are rotatably arranged on the two sides of the adsorption holes, in the process that the fixing plates move along with the rotary chain, the adsorption holes adsorb the seam edges on the storage rollers and move the seam edges to the side face of the composite bag, and then the overturning plates rotate reversely to bend the seam edges to the wall face of the composite bag from the two sides. The problems that a composite bag is prone to wrinkling in the conveying process, so that a notch is prone to being uneven when the wrinkling position of the composite bag is cut in the cutting process, and the composite bag cannot be better wrapped by sewing the composite bag from the upper side and the lower side through edge sewing strips are solved.

Description

Technical Field

[0001] The invention relates to the technical field of composite bag production, in particular to a method for preparing a highly waterproof paper-plastic composite bag. Background Art

[0002] ‌Paper-plastic composite bag is a packaging material composed of a plastic layer and kraft paper. The production process of paper-plastic composite bag usually includes combining plastic woven cloth and kraft paper under high temperature and high pressure to form a three-in-one composite structure. This structure not only has excellent physical properties, such as tear resistance and strong adhesion, but also has good chemical stability, and can resist moisture, acid and alkali, and corrosion.

[0003] A Chinese invention patent with application publication number CN111152511A discloses a paper-plastic composite bag cutting machine and a production and cutting method, including a conveying device, a cutting device and a sewing device, wherein the cutting device is installed on the right end surface of the conveying device, and the sewing device is installed on the right side of the cutting device. The present invention can solve the problems that the existing equipment usually adopts a fixed-length processing method when cutting the paper-plastic composite bag, which cannot meet the needs of paper-plastic composite bags of different lengths, and the equipment has low flexibility in use. In addition, the existing equipment cannot simultaneously sew the bottom edge of the paper-plastic composite bag when cutting the paper-plastic composite bag, which prolongs the subsequent processing steps, reduces the processing rate and continuity, and increases the processing cost.

[0004] However, the inventors found that the device has the following problems: the composite bag is prone to wrinkles during transportation, so the composite bag is prone to uneven cuts when cutting the wrinkles during cutting, and the composite bag cannot be better wrapped by sewing the seam strips from the upper and lower sides. Summary of the invention

[0005] The purpose of the present invention is to invent a method for preparing a highly waterproof paper-plastic composite bag in view of the deficiencies of the prior art. The method comprises a cutting assembly and a seam strip edge conveying assembly. The cutting assembly comprises a cylinder and a cutter driven by the cylinder. Pressing plates are slidably arranged on both sides of the cutter, a smoothing plate is slidably arranged below the pressing plate, and a carrying plate is slidably arranged below the cutter. During the descent of the cutter, the pressing plate and the carrying plate clamp the composite bag and move it to both sides, thereby smoothing the composite bag. The seam strip edge conveying assembly comprises a rotary chain and a plurality of fixed plates arranged on the rotary chain. A plurality of adsorption holes are arranged on the fixed plate. Turning plates are rotatably arranged on both sides of the adsorption holes. During the movement of the fixed plate with the rotary chain, the adsorption holes adsorb the seam strip edges on the storage roller and move them to the side of the composite bag. Subsequently, the turning plate is reversed to bend the seam strip edges from both sides to the wall surface of the composite bag, and finally sew them through a sewing machine. The problem that wrinkles are easy to occur during the conveying process of the composite bag is solved. Therefore, when the folds of the composite bag are cut during the cutting process, uneven cuts are easy to occur, and the composite bag cannot be better wrapped by sewing the seam strips from the upper and lower sides.

[0006] In view of the above technical problems, the technical solution adopted by the present invention is as follows: a method for preparing a highly waterproof paper-plastic composite bag, comprising a support frame, a cutting assembly, a seam edge conveying assembly, an air blowing channel, and a sewing machine, wherein the cutting assembly comprises a cylinder and a cutter driven by the cylinder, pressing plates are slidably arranged on both sides of the cutter, a smoothing plate is slidably arranged below the pressing plate, and a bearing plate slidably arranged on the support frame is arranged below the smoothing plate, and the cutter is driven to descend by the cylinder so that the smoothing plate and the bearing plate clamp the composite bag and move to both sides to level the cut portion of the composite bag, and the seam edge conveying assembly comprises a storage roller and a storage roller arranged on one side of the storage roller. A revolving chain, wherein a plurality of fixed plates are arranged on the revolving chain, a plurality of adsorption holes are opened on the surface of the fixed plate, and folding plates are rotatably arranged on the upper and lower sides of the adsorption holes of the fixed plate, and a guide rail is arranged above the revolving chain. During the rotation of the fixed plate with the revolving chain, the adsorption holes are driven to absorb air under the action of the guide rail, thereby adsorbing the seam strip edges on the storage roller, and the folding plates are used to fold from the upper and lower sides to the middle under the action of the guide rail during the movement of the fixed plate, thereby fitting the seam strip edges to the composite bag from the upper and lower sides, and then the seam strip edges are kept in contact under the action of the air blowing channel, and the seam strip edges and the composite bag are sewn together under the action of the sewing machine.

[0007] As a preferred embodiment, fixed rods are provided on both sides of the cutter, a limiting rod is provided at the lower end of the fixed rod, a sleeve is provided above the pressing plate, the pressing plate is slidably set on the fixed rod through the sleeve, a slider is provided below the pressing plate, a sliding groove is provided on the end surface of the smoothing plate, a sliding rod is provided in the sliding groove, the sliding rod is slidably set on the slider, and a spring mounted on the sliding rod is provided between the slider and the sliding groove.

[0008] As a preferred embodiment, the support frame is provided with bearing rods on both sides of the cutter, the bearing plates are slidably arranged on the bearing rods, and inclined surfaces are arranged at the joints of the bearing plates on both sides. Pressure rods are provided on both sides of the cutter, and the lower end faces of the pressure rods are V-shaped. A spring is provided between the bearing plate and the support frame and is sleeved on the bearing rods.

[0009] As a preference, an adsorption channel communicating with the adsorption hole is provided in the fixed plate, a piston cylinder identical to the adsorption channel is provided on the end face of the fixed plate, a piston is slidably provided in the piston cylinder, a piston rod is provided on the side of the piston, a slideway a is provided on the surface of the guide rail, and the piston rod is clamped in the slideway a.

[0010] As a preferred embodiment, the fixed plate has openings on both the upper and lower sides of the adsorption hole, a rotating shaft is provided on the opening, the folding plate is rotatably set on the rotating shaft, a support plate is provided on the fixed plate, push rods are slidably set on both the upper and lower sides of the support plate, a slide b is provided on the surface of the guide rail, and the push rod is slidably set on the surface of the slide b.

[0011] As a preference, a plurality of air blowing holes are provided on the side of the pressing plate, and an air blowing channel communicating with the air blowing holes is provided in the sleeve, and the air blowing holes are arranged to be inclined downward.

[0012] As a preference, the air blowing channel is arranged on both sides of the composite bag, the air blowing channel is U-shaped, and the upper and lower sides of the air blowing channel are both in contact with the upper and lower sides of the composite bag, and an air pump for driving the air blowing channel for air blowing is arranged under the rotary chain.

[0013] As a preferred embodiment, a limit ring is provided on the push rod, and a spring sleeved on the push rod is provided between the limit ring and the support plate.

[0014] Preferably, a torsion spring is provided between the folding plate and the rotating shaft.

[0015] As a preference, both ends of the push rod are configured to be hemispherical.

[0016] Beneficial effects of the present invention: By arranging fixed rods on both sides of the cutter, a limit rod is arranged at the lower end of the fixed rod, a sleeve is arranged above the pressing plate, and the pressing plate is slidably arranged on the fixed rod through the sleeve, and a spring is arranged in the sleeve. By arranging a plurality of air blowing holes obliquely on the side of the pressing plate, the cutting part of the composite bag is cleaned by air blowing through the air blowing holes during the descending process of the cutter to prevent the surface impurities from affecting the cutting quality, and when the cutter cuts, the smoothing plate under the pressing plate is pressed on both sides of the cutter to prevent the composite bag from shifting during the cutting process.

[0017] When the cutter descends for cutting, the pressing plate and the pressure plate are driven down. A smoothing plate is slidably provided at the lower end of the pressing plate. The smoothing plate overlaps with the supporting plate and clamps the composite bag. The supporting plate and the smoothing plate are driven to move to both sides under the action of the pressure plate, thereby smoothing the composite bag to prevent wrinkles from occurring during the cutting process and affecting the cutting quality.

[0018] In the process of the fixed plate moving with the revolving chain, the piston rod is driven to move under the action of the guide rail, thereby driving the piston to move and causing negative pressure to be generated in the adsorption hole, so that the seam strip is adsorbed and clamped through the storage roller, and the seam strip is driven to move to the side of the composite bag, and the push rod is driven to move under the action of the guide rail, so that the folding plate on the fixed plate rotates, thereby bending the seam strip from both sides to the middle to the surface of the composite bag, so that the seam strip can better wrap the composite bag.

[0019] In summary, the equipment has the advantages of good cutting effect, avoiding composite bag wrinkles, good seam edge wrapping effect, etc., and is particularly suitable for the field of composite bag production technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of a method for preparing a highly waterproof paper-plastic composite bag; Figure 2 It is a structural schematic diagram of a cutting component in a method for preparing a highly waterproof paper-plastic composite bag; Figure 3 A top view of a guide rail in a method for preparing a highly waterproof paper-plastic composite bag; Figure 4 It is a partial cross-sectional view of a cutting component in a method for preparing a highly waterproof paper-plastic composite bag; Figure 5 It is a schematic diagram of the local structure in a method for preparing a highly waterproof paper-plastic composite bag; Figure 6 It is a schematic diagram of the local structure in a method for preparing a highly waterproof paper-plastic composite bag; Figure 7 It is a partial cross-sectional view of a method for preparing a highly waterproof paper-plastic composite bag; Figure 8 for Figure 2 A partial enlarged view of the middle A; Fig. 9 for Figure 4 A partial enlarged view of point B in the middle; Fig.10 A working state diagram of adsorption holes in a method for preparing a highly waterproof paper-plastic composite bag; Fig.11 This is a working state diagram of a folding plate in a method for preparing a highly waterproof paper-plastic composite bag.

[0022] The attached drawings are marked as follows: 1. Support frame; 2. Cutting assembly; 3. Seam edge conveying assembly; 4. Air blowing channel; 5. Sewing machine; 6. Cylinder; 7. Cutter; 8. Pressing plate; 9. Smoothing plate; 10. Carrying plate; 11. Storage roller; 12. Rotating chain; 13. Fixed plate; 14. Adsorption hole; 15. Folding plate; 16. Guide rail; 21. Fixed rod; 22. Limit rod; 23. Sleeve; 24. Slider; 25. Slide groove; 26. Sliding rod; 31. Carrying rod; 32. Inclined surface; 33. Pressing rod; 41. Adsorption channel 42. Piston cylinder; 43. Piston; 44. Piston rod; 45. Slide a; 51. Opening; 52. Rotating shaft; 53. Support plate; 54. Push rod; 55. Slide b; 61. Air blowing hole; 62. Air blowing channel; 71. Air pump; 81. Limiting ring. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings.

[0024] Embodiment 1

[0025] like Figures 1 to 11As shown, a method for preparing a highly waterproof paper-plastic composite bag comprises a support frame 1, a cutting assembly 2, a seam edge conveying assembly 3, an air blowing channel 4, and a sewing machine 5. The cutting assembly 2 comprises a cylinder 6 and a cutter 7 driven by the cylinder 6. Pressing plates 8 are slidably arranged on both sides of the cutter 7. A smoothing plate 9 is slidably arranged below the pressing plate 8. A carrying plate 10 slidably arranged on the support frame 1 is arranged below the smoothing plate 9. During the process of the cutter 7 being driven down by the cylinder 6, the smoothing plate 9 and the carrying plate 10 clamp the composite bag and move to both sides so as to level the cut portion of the composite bag. The seam edge conveying assembly 3 comprises a storage roller 11 and a revolving chain 12 arranged on one side of the storage roller 11. The revolving chain 1 2 is provided with a plurality of fixed plates 13, and a plurality of adsorption holes 14 are opened on the surface of the fixed plates 13. The fixed plates 13 are rotatably provided with folding plates 15 on both upper and lower sides of the adsorption holes 14. A guide rail 16 is provided above the revolving chain 12. In the process of the fixed plates 13 rotating with the revolving chain 12, the adsorption holes 14 are driven to absorb air under the action of the guide rail 16, so as to adsorb the seam strip edges on the storage roller 11. The folding plates 15 are used to fold from the upper and lower sides to the middle under the action of the guide rail 16 during the movement of the fixed plates 13, so as to fit the seam strip edges to the composite bag from the upper and lower sides, and then the seam strip edges are kept in contact under the action of the air blowing channel 4, and the seam strip edges and the composite bag are sewed under the action of the sewing machine 5.

[0026] like Fig. 9 As shown, fixed rods 21 are provided on both sides of the cutter 7, and a limiting rod 22 is provided at the lower end of the fixed rod 21. A sleeve 23 is provided above the pressing plate 8, and the pressing plate 8 is slidably set on the fixed rod 21 through the sleeve 23. A slider 24 is provided below the pressing plate 8, and a slide groove 25 is provided on the end surface of the smoothing plate 9. A slide rod 26 is provided in the slide groove 25, and the slide rod 26 is slidably set on the slide block 24, and a spring sleeved on the slide rod 26 is provided between the slide block 24 and the slide groove 25.

[0027] It is worth mentioning here that the pressing plates 8 on both sides are driven down during the descending process of the cutter 7. After the smoothing plate 9 below the pressing plate 8 presses against the composite bag, the cutter 7 continues to descend, thereby compressing the spring in the sleeve 23, so that the pressing plate 8 presses the composite bag on both sides of the cutter 7 to prevent the composite bag from shifting during the cutting process.

[0028] like Figure 4 , Figure 8 As shown, the support frame 1 is provided with bearing rods 31 on both sides of the cutter 7, the bearing plate 10 is slidably set on the bearing rods 31, and inclined surfaces 32 are provided at the joints of the bearing plates 10 on both sides. Pressure rods 33 are provided on both sides of the cutter 7, and the lower end surface of the pressure rod 33 is V-shaped. A spring is provided between the bearing plate 10 and the support frame 1 and is sleeved on the bearing rod 31.

[0029] In addition, as the cutter 7 descends, the pressure rod 33 is driven downward. When the smoothing plate 9 presses the composite bag, it contacts the supporting plate 10 to clamp the composite bag. At the same time, the pressure rod 33 descends and drives the supporting plate 10 and the smoothing plate 9 to move to both sides through the V-shaped contact slope 32, so that the composite bag is stretched and smoothed by the smoothing plate 9 and the supporting plate 10 to prevent the composite bag from wrinkles during the cutting process.

[0030] like Figure 1 , Figure 7 As shown, the fixed plate 13 is provided with an adsorption channel 41 which is communicated with the adsorption hole 14, the end face of the fixed plate 13 is provided with a piston cylinder 42 which is the same as the adsorption channel 41, a piston 43 is slidably provided in the piston cylinder 42, a piston rod 44 is provided on the side of the piston 43, a slideway a45 is provided on the surface of the guide rail 16, and the piston rod 44 is clamped in the slideway a45.

[0031] It should be noted that when the fixed plate 13 moves with the rotating chain 12 to a position close to the storage roller 11, the piston cylinder 42 moves to the side away from the fixed plate 13 under the action of the slide a45, thereby driving the piston 43 to move through the adsorption channel 41 so that the adsorption hole 14 generates suction to adsorb the seam edge on the storage roller 11, and driven by the rotating chain 12, the seam edge moves to both sides of the composite bag.

[0032] like Figure 3 , Figure 7 As shown, the fixed plate 13 is provided with openings 51 on both the upper and lower sides of the adsorption hole 14, and a rotating shaft 52 is provided on the opening 51. The folding plate 15 is rotatably set on the rotating shaft 52. A supporting plate 53 is provided on the fixed plate 13, and push rods 54 are slidably set on the upper and lower sides of the support plate 53. A slide b55 is provided on the surface of the guide rail 16, and the push rod 54 is slidably set on the surface of the slide b55.

[0033] It is explained here that by rotatably setting folding plates 15 on the upper and lower sides of the fixed plate 13, when the fixed plate 13 drives the seam strip edge to move to the two sides of the composite bag, the push rod 54 moves toward the side of the folding plate 15 under the action of the slide b55, thereby driving the folding plates 15 on the upper and lower sides to rotate toward the middle, thereby driving the seam strip edge to bend toward one side of the composite bag, so that the seam strip edge is U-shaped and wraps the composite bag.

[0034] like Fig. 9 As shown, a plurality of air blowing holes 61 are provided on the side of the pressing plate 8, and an air blowing channel 62 communicating with the air blowing holes 61 is provided in the sleeve 23, and the air blowing holes 61 are arranged to be inclined downward.

[0035] In addition, after the pressing plate 8 abuts against the composite bag as the cutter 7 descends, the cutter continues to descend, thereby driving the fixing rod 21 to continue to descend, so that the air blowing hole 61 is blown through the air blowing channel 62 to clean the surface of the composite bag.

[0036] like Figure 1 As shown, the air blowing channel 4 is arranged on both sides of the composite bag, the air blowing channel 4 is U-shaped, and the upper and lower sides of the air blowing channel 4 are both in contact with the upper and lower sides of the composite bag. An air pump 71 is arranged under the rotary chain 12 to drive the air blowing channel 4 for air blowing.

[0037] It is worth mentioning here that the air blowing channel 4 is arranged after the folding plate 15 drives the seam strip edge to bend, and the air blowing channel 4 continuously blows air to shape the bent seam strip edge, so as to prevent the seam strip edge from lifting up and affecting the sewing quality during the subsequent sewing process.

[0038] like Figure 7 As shown, a limit ring 81 is provided on the push rod 54 , and a spring sleeved on the push rod 54 is provided between the limit ring 81 and the support plate 53 .

[0039] It is explained here that by providing a spring sleeved on the push rod 54 between the limit ring 81 and the support plate 53, the push rod 54 can drive the folding plate 15 to fold and then reset under the action of the spring, thereby preparing for the next cycle process.

[0040] A torsion spring is provided between the folding plate 15 and the rotating shaft 52 .

[0041] It should be mentioned that, by providing a torsion spring between the folding plate 15 and the rotating shaft 52 , after the folding plate 15 rotates downward, the folding plate 15 can be reset by the torsion spring while the push rod 54 is reset.

[0042] As shown in the figure, both ends of the push rod 54 are configured to be hemispherical.

[0043] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front and back", "left and right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

[0044] Of course, in the present technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0045] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art under the technical prompts of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for preparing a highly waterproof paper-plastic composite bag, comprising a support frame (1), a cutting assembly (2), a seam edge conveying assembly (3), an air blowing channel (4), and a sewing machine (5), characterized in that: The cutting assembly (2) comprises a cylinder (6) and a cutter (7) driven by the cylinder (6), pressing plates (8) are slidably arranged on both sides of the cutter (7), a smoothing plate (9) is slidably arranged below the pressing plate (8), and a carrying plate (10) slidably arranged on the support frame (1) is arranged below the smoothing plate (9), and the cutter (7) is driven down by the cylinder (6) so that the smoothing plate (9) and the carrying plate (10) clamp the composite bag and move to both sides so as to level the cut portion of the composite bag, and the seam edge conveying assembly (3) comprises a storage roller (11) and a revolving chain (12) arranged on one side of the storage roller (11), and a plurality of fixed plates (13) are arranged on the revolving chain (12), and the fixed plates (13) A plurality of adsorption holes (14) are provided on the surface of the fixed plate (13). Folding plates (15) are rotatably provided on both upper and lower sides of the adsorption holes (14). A guide rail (16) is provided above the revolving chain (12). When the fixed plate (13) rotates with the revolving chain (12), the adsorption holes (14) are driven to absorb air under the action of the guide rail (16), thereby adsorbing the seam strip edges on the storage roller (11). When the fixed plate (13) moves with the fixed plate (13), the folding plates (15) are used to fold from the upper and lower sides to the middle under the action of the guide rail (16), thereby laminating the seam strip edges to the composite bag from the upper and lower sides. Subsequently, the seam strip edges are kept in contact with each other under the action of the air blowing channel (4), and the seam strip edges and the composite bag are sewn together under the action of the sewing machine (5).

2. The method for preparing a highly waterproof paper-plastic composite bag according to claim 1, characterized in that: Fixed rods (21) are provided on both sides of the cutter (7), and a limit rod (22) is provided at the lower end of the fixed rod (21). A sleeve (23) is provided above the pressing plate (8), and the pressing plate (8) is slidably arranged on the fixed rod (21) through the sleeve (23). A slider (24) is provided below the pressing plate (8). A slide groove (25) is provided on the end surface of the smoothing plate (9), and a slide rod (26) is provided in the slide groove (25). The slide rod (26) is slidably arranged on the slide rod (24), and a spring sleeved on the slide rod (26) is provided between the slide rod (24) and the slide groove (25).

3. The method for preparing a highly waterproof paper-plastic composite bag according to claim 1, characterized in that: The support frame (1) is provided with bearing rods (31) on both sides of the cutter (7); the bearing plate (10) is slidably arranged on the bearing rods (31); inclined surfaces (32) are arranged at the contacting parts of the bearing plates (10) on both sides; pressure rods (33) are arranged on both sides of the cutter (7); the lower end surface of the pressure rod (33) is V-shaped; and a spring sleeved on the bearing rod (31) is arranged between the bearing plate (10) and the support frame (1).

4. The method for preparing a highly waterproof paper-plastic composite bag according to claim 1, characterized in that: An adsorption channel (41) communicating with the adsorption hole (14) is arranged in the fixed plate (13); a piston cylinder (42) identical to the adsorption channel (41) is arranged on the end surface of the fixed plate (13); a piston (43) is slidably arranged in the piston cylinder (42); a piston rod (44) is arranged on the side of the piston (43); a slideway a (45) is provided on the surface of the guide rail (16); and the piston rod (44) is clamped in the slideway a (45).

5. The method for preparing a highly waterproof paper-plastic composite bag according to claim 1, characterized in that: The fixed plate (13) is provided with openings (51) on both upper and lower sides of the adsorption hole (14); a rotating shaft (52) is provided on the opening (51); the folding plate (15) is rotatably arranged on the rotating shaft (52); a supporting plate (53) is provided on the fixed plate (13); push rods (54) are slidably arranged on both upper and lower sides of the supporting plate (53); a slideway b (55) is provided on the surface of the guide rail (16); and the push rod (54) is slidably arranged on the surface of the slideway b (55).

6. The method for preparing a highly waterproof paper-plastic composite bag according to claim 2, characterized in that: A plurality of air blowing holes (61) are arranged on the side of the pressing plate (8), and an air blowing channel (62) communicating with the air blowing holes (61) is arranged in the sleeve (23), and the air blowing holes (61) are arranged to be inclined downward.

7. The method for preparing a highly waterproof paper-plastic composite bag according to claim 1, characterized in that: The air blowing channel (4) is arranged on both sides of the composite bag, the air blowing channel (4) is U-shaped, and the upper and lower sides of the air blowing channel (4) are in contact with the upper and lower sides of the composite bag. An air pump (71) for driving the air blowing channel (4) to perform air blowing is arranged below the revolving chain (12).

8. The method for preparing a highly waterproof paper-plastic composite bag according to claim 5, characterized in that: A limit ring (81) is provided on the push rod (54), and a spring sleeved on the push rod (54) is provided between the limit ring (81) and the support plate (53).

9. The method for preparing a highly waterproof paper-plastic composite bag according to claim 5, characterized in that: A torsion spring is provided between the folding plate (15) and the rotating shaft (52).

10. The method for preparing a highly waterproof paper-plastic composite bag according to claim 5, characterized in that: Both ends of the push rod (54) are configured to be hemispherical.

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