Degradable environment-friendly paper packaging bag and preparation process thereof

Abstract

The invention provides a degradable environment-friendly paper packaging bag and a preparation process thereof, belongs to the technical field of packaging bag preparation, and solves the technical problem that existing non-woven fabrics made of bio-based materials such as polylactic acid (PLA) can be degraded within 6 months to 2 years under the action of microorganisms. According to the degradable environment-friendly paper packaging bag, a base material of the packaging bag is prepared from the following substances in parts by weight: 100 parts of raw wood pulp, 15-30 parts of starch, 6-10 parts of glycerol and 11-20 parts of jute fibers, the coating of the degradable environment-friendly paper packaging bag is prepared from the following substances in parts by weight: 50-70 parts of a mixture formed by mixing a waterborne polyurethane dispersion and an acrylate emulsion in a ratio of 1: 1, 0.2-0.5 part of a mildew preventive, and 0.8-2.5 parts of a flatting agent and a defoaming agent in total. The preparation method has the advantages that the degradable annular plate paper packaging bag is prepared, and the overall preparation efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of packaging bag preparation technology, and relates to a packaging bag, particularly a biodegradable and environmentally friendly paper packaging bag and its preparation process. Background Technology

[0002] Packaging bags are bags used to package various goods, facilitating transportation and storage during production and distribution. They are widely used in daily life and industrial production. Actual figures show that 80% of used packaging bags end up in landfills like regular waste, with only 7% being recycled. Because some packaging bags are chemically stable, they can persist in the environment for extended periods, leading to a large accumulation of packaging bags and causing serious environmental damage.

[0003] A search revealed a biodegradable and environmentally friendly packaging bag disclosed in Chinese patent literature [Application No.: 202411528546.4; Publication No.: CN 119175919 A]. This biodegradable and environmentally friendly packaging bag is made of non-woven fabric and biodegradable hot melt adhesive, wherein the non-woven fabric is PLA non-woven fabric. A manufacturing process for this biodegradable and environmentally friendly packaging bag includes a base frame, a device frame on the base frame, a vertically arranged device plate on the right side of the base frame, a feeding mechanism on the device plate, an opening mechanism below the device frame, pressing mechanisms on both the left and right sides of the device frame, a glue spraying mechanism between the pressing mechanism and the feeding mechanism on the right side, and a winding device on the right side of the base frame. The advantages are: this invention improves the environmental friendliness of the packaging bag, and the production process is highly automated, directly completing the winding of the packaging bag, greatly improving production efficiency.

[0004] Although the patent directly completes the rolling of the packaging bags, greatly improving production efficiency, the non-woven fabric made of bio-based materials such as polylactic acid (PLA) takes 6 months to 2 years to degrade under the action of microorganisms, while paper bags usually only take about a month to degrade in the natural environment. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a biodegradable and environmentally friendly paper packaging bag and its preparation process. The technical problem to be solved by this invention is: how to prepare biodegradable ring-plate paper packaging bags and improve the overall preparation efficiency.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A biodegradable and environmentally friendly paper packaging bag, wherein the base material of the biodegradable and environmentally friendly paper packaging bag is prepared from the following substances by weight: 100 parts of virgin wood pulp, 15-30 parts of starch, 6-10 parts of glycerin, and 11-20 parts of jute fiber; and the coating of the biodegradable and environmentally friendly paper packaging bag is prepared from the following substances by weight: 50-70 parts of a mixture of waterborne polyurethane dispersion and acrylic emulsion in a 1:1 ratio, 0.2-0.5 parts of antifungal agent, and 0.8-2.5 parts of leveling agent and defoamer combined.

[0008] The leveling agent is prepared from the following substances by weight: 25-40 parts of hydrophobic modified polyurethane (HEUR) dispersion, 10-15 parts of deionized water, 0.3-0.5 parts of defoamer, and 0.5-1.5 parts of pH stabilizer.

[0009] The virgin wood pulp is added with a reinforcing agent, which is prepared from the following substances by weight: 60-70 parts soybean protein gum, 50-60 parts polyol polymer, and 20-30 parts isocyanate.

[0010] The specific preparation process is as follows:

[0011] S1. Substrate preparation: According to the raw material ratio, virgin wood pulp and starch are poured into a mixer and stirred. During the stirring process, an appropriate proportion of glycerol and jute fiber are added. After stirring and mixing in the mixer for 40-60 minutes, flocculent substrate is obtained.

[0012] S2. Coating preparation: According to the raw material ratio, the mixture of hydrophobic modified polyurethane (HEUR) dispersion and acrylate emulsion in a 1:1 ratio, and deionized water are poured into a mixer and stirred. During the stirring process, an appropriate proportion of defoamer and pH stabilizer are added. After stirring in the mixer for 30-50 minutes, the packaging bag coating is obtained.

[0013] S3. Dehydration and shaping: The flocculent substrate is sprayed onto the screen machine and initially dehydrated on the endless screen (metal mesh belt) to form a continuous wet paper web. The wet paper web is then placed into the roller pressing production line to squeeze out excess water and dried by hot press rollers to achieve drying and shaping. A coating is then applied to the paper surface to form a protective layer.

[0014] S4. Stretching and bonding: The dried paper web is stretched through multiple continuous rollers in the roll forming line to eliminate surface wrinkles. During the stretching process, adhesive and the prepared packaging bag coating are applied to the paper web. The rollers control the paper web conveying angle so that the paper web is folded according to its width, so that the paper web can form a continuous simple paper bag.

[0015] S5. Slitting and conveying: When the continuous simple paper bags are conveyed to the cutting structure of the roller pressing production line, the cutting structure cuts the continuous simple paper bags into individual paper bags as needed and conveys them onto the conveyor belt for easy subsequent work.

[0016] S6. Installation components: The handle is fixed by gluing or punching holes and threading rope, and the bottom of the bag is sealed by heat sealing or folding and gluing to make a biodegradable and environmentally friendly paper packaging bag.

[0017] The temperature of the hot press roller in step S3 is above 100°C.

[0018] In step S1, 4-6 parts of disulfite are added during the stirring of the pulp flocculent material.

[0019] The roller pressing production line used in steps S3-S5 is a biodegradable and environmentally friendly paper packaging bag preparation equipment, including a base frame, a control frame fixed on the base frame, a flaring frame rotatably connected to the control frame, a servo motor fixed inside the control frame, the output shaft of the servo motor being coaxially fixedly connected to the flaring frame, a pair of control arms slidably connected inside the flaring frame, a pair of compression rollers arranged between the two control arms, a heating groove on the base frame, multiple heating and expansion rollers arranged inside the heating groove, a conveying cavity connected to the heating groove inside the flaring frame, the top opening of the conveying cavity communicating with the bottom of the flaring frame, a pair of drive rollers arranged inside the conveying cavity, and an adjusting roller rotatably connected to the bottom opening of the conveying cavity. There is a pair of control arms 2, and a pair of guide seats 1 are slidably connected between the two control arms 2. Each pair of guide seats 1 is rotatably connected to a corresponding guide seat and a stabilizing roller. A pair of bidirectional lead screws 6 are rotatably connected inside the base frame. A pair of output motors are fixed inside the base frame. The output shafts of the two output motors are coaxially fixedly connected to the corresponding bidirectional lead screws 6. The threaded sections on both sides of the bidirectional lead screws 6 are threadedly connected to the corresponding guide seats 1. A servo motor 2 is fixed inside one of the guide seats 1. The output shafts of the two servo motors 2 are coaxially fixedly connected to the corresponding stabilizing rollers. A coating liquid cavity is opened in the stabilizing roller near the base frame, and a bidirectional lead screw 1 is rotatably connected to the stabilizing roller near the base frame. One end of the bidirectional lead screw 1 is connected to the guide seat 1. A guide seat is fixedly connected to the shaft. A guide slider is slidably connected inside the stabilizing roller near the base frame. The guide slider is threadedly connected to a two-way lead screw. A pressure block is fixed on the guide slider. A spring groove is opened inside the stabilizing roller near the base frame. A pressure block is slidably connected inside the spring groove. An injection chamber is opened inside the stabilizing roller near the base frame. A piston is installed in the injection chamber. The piston is fixedly connected to the pressure block. The pressure block is in a pressing fit with the pressure block. A return spring is fixed between the pressure block and the bottom of the spring groove. An injection channel is opened between the coating liquid chamber and the injection chamber. A one-way valve is fixed inside the injection channel to the injection chamber. A coated sponge layer is fixed on the surface of the stabilizing roller near the base frame. The stabilizing roller has a liquid injection channel two, with the two ends of the liquid injection channel two connecting the liquid injection chamber and the coating sponge layer respectively. A one-way valve two is fixed in the liquid injection channel two, which flows to the coating sponge layer. A one-way valve interface that flows to the coating liquid chamber is fixed on the stabilizing roller near the base frame. A pair of folding rollers are vertically arranged on the side of the base frame. A pair of regulating arms three are slidably connected to the side of the base frame. A pair of flipping rollers are arranged between the two regulating arms three. A roller pressing channel is opened in the base frame. Multiple conveying rollers are arranged in the roller pressing channel. A protective cover plate that covers the roller pressing channel is hinged on the base frame. A storage cavity is opened in the base frame. A conveyor belt is arranged in the storage cavity. A cutting component is set at one end of the roller pressing channel. One end of the roller pressing channel is located directly above the conveyor belt.

[0020] Using the above structure, the wet paper web, which has undergone preliminary dewatering by a screen machine, can be received through a flaring frame. Two squeeze rollers then perform initial squeezing to remove some of the water trapped in the wet paper web. Two drive rollers then transport the wet paper web, adjusting the conveying angle of the rollers. The squeezed wet paper web passes through multiple heated stretching rollers in a staggered manner, where it is dried. The spacing between the heated stretching rollers can be adjusted to control the tension according to the paper web's properties, thereby improving the paper web's appearance and eliminating wrinkles. Two stabilizing rollers then support and assist in the transport of the paper web. During transport, one stabilizing roller has a bidirectional screw that is stable, while the other stabilizing roller rotates. The first stabilizing roller drives a guide slider to rotate on the bidirectional screw, enabling the guide slider to move left and right. The guide slider then drives a pressure block to move to the left, causing pressure block one to squeeze pressure block two. Pressure block two then drives piston one to move. During piston one's movement, a negative pressure is generated in the injection chamber, causing liquid to flow from the coating liquid chamber. When the coating is extracted, the guide slider moves to the right, causing pressure block one to disengage from pressure block two. The return spring releases pressure, causing the return piston one to return to its original position. During the return process, the coating in the injection chamber is pushed into the coating sponge layer, replenishing the coating in the coating sponge layer. Then, the coating sponge layer contacts the back of the paper web to apply the coating. The paper web is then folded in half and placed between two folding rollers. The folding rollers further control the folding state of the paper web and assist in the conveying process, ensuring that subsequent materials are conveyed to the folding rollers. The paper webs are all folded in half. Then, the folded paper webs are flipped over and placed between two flipping rollers to restore the conveying state and maintain the conveying effect. The folded paper webs are then passed through multiple conveying rollers in an alternating manner to further stretch the paper webs and prevent wrinkles from forming during the folding and conveying process. The conveying rollers then transport the paper webs to the cutting component, where the paper webs are segmented. The segmented paper segments fall onto the conveyor belt and are then transported by the transmission belt to the subsequent parts assembly and bottom sealing, thereby improving the overall packaging bag production effect.

[0021] Compared with existing technologies, this biodegradable and environmentally friendly paper packaging bag and its preparation process have the following advantages:

[0022] 1. By fully integrating starch with virgin wood pulp, the structural strength of the paper is improved. Glycerin is used as a plasticizer to penetrate into the paper fibers, which enhances the lubricity and plasticity between the fibers, making the finished paper softer to the touch and less prone to breakage or cracking due to folding or bending. The use of jute fiber further enhances the toughness and strengthens the structure, making the packaging bags durable and biodegradable.

[0023] 2. By continuously rolling the paper web through dehydration, drying, folding, sealing, wrinkle removal, and cutting, a streamlined paper web and paper bag processing effect is achieved, improving the overall work efficiency. Furthermore, by rotating the rolling line of the preparation equipment, the space occupied by the equipment is reduced.

[0024] 3. The paper web is supported and assisted in conveying by two stabilizing rollers. During the conveying process, one of the stabilizing rollers, through its own rotation and the cooperation of its internal structure, replenishes the coating in the coating sponge layer at regular intervals, so that the coating sponge layer can contact the back of the paper web and apply the coating layer stably.

[0025] 4. The drive wheel contacts the paper web, causing the drive wheel to rotate. The rotation of the drive wheel drives the first drive gear to rotate, which in turn drives the second drive gear to rotate. The rotation of the second drive gear drives the drive rod to rotate, which in turn drives the extrusion block and the push block to engage in extrusion. This causes the second piston to move, injecting the glue from the glue injection chamber into the brush layer. The brush layer contacts the edge of the paper web. When the paper web is folded by the folding roller, the sealing work is completed simultaneously, improving the overall production efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the process steps of the present invention.

[0027] Figure 2 This is a schematic diagram showing the component proportions of various embodiments and comparative examples in this invention.

[0028] Figure 3 This is a schematic diagram of Table 1, the performance test table for packaging bags in this invention.

[0029] Figure 4 This is a schematic diagram of Table 2, the performance test table for packaging bags in this invention.

[0030] Figure 5 This is a schematic diagram of Table 3, the performance test table for packaging bags in this invention.

[0031] Figure 6 This is a schematic diagram of Table 4, the performance test table for packaging bags in this invention.

[0032] Figure 7 This is a schematic diagram of the equipment for preparing biodegradable and environmentally friendly paper packaging bags in this invention.

[0033] Figure 8 This is a schematic diagram of the internal structure of the equipment for preparing biodegradable and environmentally friendly paper packaging bags in this invention.

[0034] Figure 9 This is a schematic diagram of the internal structure of the control frame and the flaring frame in this invention.

[0035] Figure 10 This is a schematic diagram of the internal structure of the heating tank in this invention.

[0036] Figure 11 This is a schematic diagram of the internal side view of the paint holder in this invention.

[0037] Figure 12 This is a schematic diagram of the internal structure of the adhesive storage tank in this invention.

[0038] Figure 13 This is a front view of the internal structure of the paint brush holder in this invention.

[0039] Figure 14 This is a schematic diagram of the internal structure of the stabilizing roller in this invention.

[0040] In the diagram: 1. Base frame; 2. Control frame; 3. Flaring frame; 4. Servo motor one; 5. Control arm one; 6. Extrusion roller; 7. Heating tank; 8. Heated expansion roller; 9. Conveying chamber; 10. Drive roller; 11. Adjusting roller; 12. Control arm two; 13. Guide seat one; 14. Stabilizing roller; 15. Servo motor two; 16. Coating liquid chamber; 17. Bidirectional lead screw one; 18. Output motor; 19. Guide slider; 20. Pressure block one; 21. Spring groove; 22. Pressure block two; 23. Injection chamber; 24. Piston one; 25. 26. Reset spring; 27. Injection channel one; 28. One-way valve one; 29. ​​Coated sponge layer; 30. Injection channel two; 31. One-way valve two; 32. One-way valve interface; 33. Folding roller; 34. Adjusting arm three; 35. Tilting roller; 36. Roller pressing channel; 37. Conveying roller; 38. Protective cover plate; 39. Storage cavity; 40. Conveyor belt; 41. Guide seat two; 42. Servo motor three; 43. Servo motor four; 44. Adjusting screw one; 45. Servo motor five; 46. Bidirectional screw two; 47. Servo motor six; 48. Double-acting lead screw 3; 49. Guide seat 3; 50. Servo motor 7; 51. Guide slide rail; 52. Guide seat 4; 53. Guide slide rod; 54. Double-acting lead screw 6; 55. Limit bolt; 56. Servo motor 8; 57. Adjustment lead screw 2; 58. Double-acting lead screw 4; 59. Servo motor 9; 60. Guide seat 5; 61. Double-acting lead screw 5; 62. Guide seat 6; 63. Servo motor 10; 64. Adjustment motor; 65. Rangefinder; 66. Electric cutter; 67. Cylinder holder; 68. Adhesive storage tank; 69. Stirring 69. Stirring rod; 70. Drive motor; 71. Can lid; 72. Liquid pump; 73. Support frame; 74. Brush rack; 75. Brush layer; 76. Adhesive storage chamber; 77. Injection chamber; 78. Piston II; 79. Drive chamber; 80. Push block; 81. Drive rod; 82. Extrusion block; 83. Push spring; 84. Injection channel I; 85. One-way valve III; 86. Injection channel II; 87. One-way valve IV; 88. Drive wheel; 89. Drive gear I; 90. Drive gear II; 91. Indentation block; 92. Two-way lead screw VI. Detailed Implementation

[0041] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0042] Example 1

[0043] like Figure 1As shown, the biodegradable and environmentally friendly paper packaging bag provided by the present invention has a base material made from the following substances by weight: 100 parts virgin wood pulp, 15 parts starch, 6 parts glycerin, and 11 parts jute fiber. The coating of the biodegradable and environmentally friendly paper packaging bag is made from the following substances by weight: 50 parts of a mixture of waterborne polyurethane dispersion and acrylic emulsion in a 1:1 ratio, 0.2 parts of antifungal agent, and 0.8 parts of leveling agent and defoamer combined.

[0044] The leveling agent is prepared from the following components by weight: 25 parts hydrophobically modified polyurethane (HEUR) dispersion, 10 parts deionized water, 0.3 parts defoamer, and 0.5 parts pH stabilizer.

[0045] A reinforcing agent is added to the virgin wood pulp. The reinforcing agent is prepared from the following substances by weight: 60 parts soybean protein gum, 50 parts polyol polymer, and 20 parts isocyanate.

[0046] The above raw materials are prepared according to the following preparation process:

[0047] (1) Substrate preparation: According to the raw material ratio, virgin wood pulp and starch are poured into a mixer and stirred. During the stirring process, an appropriate proportion of glycerol and jute fiber are added. After stirring and mixing in the mixer for 40 minutes, flocculent substrate is obtained.

[0048] (2) Coating preparation: According to the raw material ratio, the mixture of hydrophobic modified polyurethane (HEUR) dispersion and acrylate emulsion in a 1:1 ratio and deionized water are poured into a mixer for stirring. During the stirring process, an appropriate proportion of defoamer and pH stabilizer are added. After stirring and mixing in the mixer for 50 minutes, the packaging bag coating is obtained.

[0049] (3) Dehydration and shaping: The flocculent substrate is sprayed onto the screen machine and initially dehydrated on the endless screen (metal mesh belt) to form a continuous wet paper web. The wet paper web is put into the roller pressing production line to squeeze out excess water and is dried by the hot press roller to achieve drying and shaping. The coating is then applied to the paper surface to form a protective layer.

[0050] (4) Stretching and bonding: The dried paper web is stretched through multiple continuous rollers in the roll forming line to eliminate surface wrinkles. During the stretching process, adhesive and the prepared packaging bag coating are applied to the paper web. The rollers control the paper web conveying angle so that the paper web is folded according to its width, so that the paper web can form a continuous simple paper bag.

[0051] (5) Cutting and conveying: When the continuous simple paper bags are conveyed to the cutting structure of the roller pressing production line, the cutting structure cuts the continuous simple paper bags into individual paper bags as needed and conveys them to the conveyor belt for easy subsequent work.

[0052] (6) Installation components: The handle is fixed by gluing or punching holes and threading rope, and the bottom of the bag is sealed by heat sealing or folding and gluing to make a biodegradable and environmentally friendly paper packaging bag.

[0053] like Figure 7-14As shown, the roller pressing production line used in steps S3-S5 is a biodegradable and environmentally friendly paper packaging bag preparation equipment, including a base frame 1, a regulating frame 2 fixed on the base frame 1, a flaring frame 3 rotatably connected to the regulating frame 2, a servo motor 4 fixed inside the regulating frame 2, the output shaft of the servo motor 4 being coaxially fixedly connected to the flaring frame 3, a pair of regulating arms 5 slidably connected inside the flaring frame 3, a pair of squeezing rollers 6 being arranged between the two regulating arms 5, and a heating groove 7 being opened on the base frame 1, with multiple heating and expanding rollers 8 arranged inside the heating groove 7. A conveying cavity 9 communicating with the heating groove 7 is opened inside the flaring frame 3, the top opening of the conveying cavity 9 communicating with the bottom of the flaring frame 3, a pair of drive rollers 10 being arranged inside the conveying cavity 9, and an adjusting roller 10 rotatably connected to the bottom opening of the conveying cavity 9. A pair of regulating arms 12 are fixed on the base frame 1, and a pair of guide seats 13 are slidably connected between the two regulating arms 12. Each pair of guide seats 13 is rotatably connected to a corresponding guide seat and a stabilizing roller 14. A pair of bidirectional lead screws 91 are rotatably connected inside the base frame 1, and a pair of output motors 18 are fixed inside the base frame 1. The output shafts of the two output motors 18 are coaxially fixedly connected to the corresponding bidirectional lead screws 91. The threaded sections on both sides of the bidirectional lead screws 91 are threadedly connected to the corresponding guide seats 13. A servo motor 15 is fixed inside one of the guide seats 13, and the output shafts of the two servo motors 15 are coaxially fixedly connected to the corresponding stabilizing roller 14. A coating liquid cavity 16 is opened in the stabilizing roller 14 near the base frame 1. Furthermore, a bidirectional lead screw 17 is rotatably connected inside the stabilizing roller 14 near the base frame 1. One end of the bidirectional lead screw 17 is coaxially fixedly connected to a corresponding guide seat 13. A guide slider 19 is slidably connected inside the stabilizing roller 14 near the base frame 1. The guide slider 19 is threadedly connected to the bidirectional lead screw 17, and a pressure block 20 is fixed on the guide slider 19. A spring groove 21 is formed inside the stabilizing roller 14 near the base frame 1. A pressure block 22 is slidably connected inside the spring groove 21. An injection chamber 23 is formed inside the stabilizing roller 14 near the base frame 1. A piston 24 is installed inside the injection chamber 23. The piston 24 is fixedly connected to the pressure block 22. The pressure block 22 and the pressure block 20 are in a pressing fit. A return spring 2 is fixed between the pressure block 22 and the bottom of the spring groove 21. 5. An injection channel 26 is provided between the coating liquid chamber 16 and the injection chamber 23. A one-way valve 27 is fixed in the injection channel 26, leading to the injection chamber 23. A coated sponge layer 28 is fixed on the surface of the stabilizing roller 14 near the base frame 1. An injection channel 29 is provided in the stabilizing roller 14 near the base frame 1. The two ends of the injection channel 29 are connected to the injection chamber 23 and the coated sponge layer 28, respectively. A one-way valve 30 is fixed in the injection channel 29, leading to the coated sponge layer 28. A one-way valve interface 31 leading to the coating liquid chamber 16 is fixed on the stabilizing roller 14 near the base frame 1. A pair of folding rollers 32 are vertically arranged on the side of the base frame 1. A pair of regulating arms 33 are slidably connected to the side of the base frame 1. A pair of flipping rollers 34 are arranged between the two regulating arms 33.The base frame 1 has a roller pressing channel 35, within which multiple conveyor rollers 36 are arranged. A protective cover plate 37 is hinged to the base frame 1 to cover the roller pressing channel 35. The base frame 1 also has a receiving cavity 38, within which a conveyor belt 39 is installed. A cutting assembly is located at one end of the roller pressing channel 35, which is directly above the conveyor belt 39.

[0054] Using the above structure, the wet paper web, which has undergone preliminary dewatering via a screen, can be received through the flaring frame 3. It is then initially squeezed by two squeeze rollers 6 to expel some of the water trapped within the wet paper web. The wet paper web is then conveyed by two drive rollers 10, and the adjusting roller 11 pulls the paper web to change its conveying angle. The squeezed wet paper web passes through multiple heated stretching rollers 8 in a staggered manner, where it is dried. The spacing between the heated stretching rollers 8 can be adjusted to control the tension according to the paper web's properties, thereby improving the paper web's appearance and eliminating wrinkles. Finally, it is further dried by… Two stabilizing rollers 14 support and assist in the conveying of the paper web. During the conveying process, the bidirectional screw 17 inside one of the stabilizing rollers 14 is in a stable state, while the other stabilizing roller 14 is in a rotating state. The one stabilizing roller 14 drives the guide slider 19 to rotate as a whole on the bidirectional screw 17, enabling the guide slider 19 to move left and right. The guide slider 19 then drives the pressure block 20 to move to the left, causing the pressure block 20 to squeeze the pressure block 22. The pressure block 22 drives the piston 24 to move. During the movement of the piston 24, a negative pressure is generated in the injection chamber 23, causing the coating liquid to flow from the injection chamber 23. The coating is extracted from cavity 16. At this time, guide slider 19 moves to the right, causing pressure block 20 to disengage from pressure block 22. Return spring 25 releases pressure, causing push piston 24 to return to its original position. During the return process, piston 24 pushes the coating from injection cavity 23 into coating sponge layer 28, replenishing the coating in the coating sponge layer 28. The coating sponge layer 28 then contacts the back of the paper web for coating. The paper web is then folded and placed between two folding rollers 32. The folding rollers 32 further restrict the folding state of the paper web and assist in conveying it. The paper webs subsequently conveyed to the folding rollers 32 are all processed into a folded state. Then, the folded paper webs are flipped over and placed between two flipping rollers 34 to restore the conveying state and maintain the conveying effect. The folded paper webs are then passed through multiple conveying rollers 36 in an alternating manner to further expand the paper webs and prevent wrinkles from forming during the folding and conveying process. The conveying rollers 36 convey the paper webs to the cutting component, where the cutting component segments the paper webs. The segmented paper segments fall onto the conveyor belt 39 and are then conveyed by the transmission belt to the subsequent parts assembly and bottom sealing, thereby improving the overall packaging bag preparation effect.

[0055] Each of the two control arms 5 is slidably connected to a pair of guide seats 40. Each guide seat 40 is rotatably connected to a corresponding extrusion roller 6, and a servo motor 41 is fixed inside each guide seat 40. The output shaft of each servo motor 41 is coaxially fixedly connected to the corresponding extrusion roller 6. A pair of servo motors 42 are fixed inside the flaring frame 3, and a pair of control screws 43 are rotatably connected inside the flaring frame 3. Each control screw 43 is coaxially fixedly connected to a corresponding servo motor 42, and each control screw 43 is threadedly connected to a corresponding control arm 5. A servo motor 44 is rotatably connected inside each control arm 5, and a bidirectional screw 45 is rotatably connected inside each control arm 5. Each servo motor 44 is coaxially fixedly connected to the corresponding bidirectional lead screw 45. The threaded sections on both sides of each bidirectional lead screw 45 are threadedly connected to the corresponding guide seat 40. A pair of servo motors 46 are fixedly installed inside the control frame 2. A bidirectional lead screw 47 is rotatably connected inside the control frame 2. The output shafts of both servo motors 46 are coaxially fixedly connected to the corresponding bidirectional lead screw 47. Two pairs of guide seats 48 are slidably connected inside the control frame 2, and a servo motor 49 is fixedly installed inside each pair of guide seats 48. The output shaft of each servo motor 49 is coaxially fixedly connected to the corresponding drive roller 10. The threaded sections on both sides of each bidirectional lead screw 47 are threadedly connected to the corresponding guide seat 48. The frame 1 has a pair of guide grooves 50, each with multiple guide seats 51 arranged on it. A guide rod 52 is fixed within each guide groove 50, and each guide rod 52 passes through a corresponding guide seat 51. Both ends of each heated expansion roller 8 are rotatably connected to a corresponding guide seat 51. Each guide seat 51 is threaded with a limit bolt 54, the bottom of which is fixed with an anti-slip rubber layer and press-fitted against the surface of the frame 1. Each heated expansion roller 8 contains a heating element. A pair of servo motors 55 are fixed inside the frame 1, and a control screw 56 is rotatably connected within the frame 1. The output shaft of each servo motor 55 is connected to a corresponding control screw. The two control screws 2 and 56 are coaxially fixedly connected. Each control screw 2 and 56 is threadedly connected to the corresponding control arm 3 and 33. Each control arm 3 and 33 is rotatably connected to a bidirectional screw 4 and 57. Each control arm 3 and 33 is fixedly equipped with a servo motor 9 and 58. The output shaft of each servo motor 9 and 58 is coaxially fixedly connected to the corresponding bidirectional screw 4 and 57. Each control arm 3 and 33 is slidably connected to a pair of guide seats 5 and 59. The two threaded sections of each bidirectional screw 4 and 57 are threadedly connected to the corresponding guide seats 5 and 59. Each guide seat 5 and 59 is rotatably connected to the corresponding tilting roller 34. A bidirectional screw 5 and 60 is rotatably connected inside the base frame 1. The threaded sections on both sides of the bidirectional screw 5 and 60 are threadedly connected to guide seats 6 and 61.Each guide seat 61 is rotatably connected to the corresponding folding roller 32. A servo motor 10 62 is fixed on the base frame 1, and the output shaft of the servo motor 10 62 is coaxially fixedly connected to the bidirectional lead screw 5 60. Multiple control motors 63 are fixed inside the base frame 1, and the output shaft of each control motor 63 is coaxially fixedly connected to the corresponding conveying roller 36.

[0056] Using the above structure, servo motor 3 41 drives the pressure roller 6 to rotate actively, thereby achieving the effect of squeezing and conveying the paper web. Servo motor 42 drives the control screw 1 43 to rotate, which in turn moves the corresponding control arm, thus reciprocating the squeezing of the wet paper web and improving the squeezing effect. Servo motor 5 44 drives the bidirectional screw 2 45 to rotate, causing the bidirectional screw to move the corresponding guide seat 2 40, thereby achieving automatic squeezing of the paper web. Servo motor 6 46 drives the bidirectional screw 3 47 to rotate, causing the corresponding guide seat 3 48 to move, thus causing the two guide seats 3 48 to move the corresponding drive roller 10 in opposite directions to complete contact with the paper web. Servo motor 7 49 causes the drive roller 10 to rotate automatically, achieving the effect of active conveying. The sliding capability of seat 4 51 gives the heated stretching roller 8 the ability to move, thereby realizing the function of adjusting the tension. The tightening of the limit bolt 54 realizes the limiting state of each heated stretching roller 8. The servo motor 8 55 drives the control screw 2 56 to rotate, and the control screw 2 56 drives the corresponding control arm 33 to move, thereby realizing the up and down movement of the two flipping rollers 34. This adjusts the distance between the flipping rollers 34 and other rollers according to the paper web condition. The servo motor 9 58 drives the bidirectional screw 4 57 to rotate, so that the bidirectional screw 4 57 can drive the two flipping rollers 34 to contact the paper web. The servo motor 10 62 drives the bidirectional screw 5 60 to rotate, and the bidirectional screw 5 60 drives the corresponding folding roller 32 to move in opposite directions, thereby realizing the folding of the paper web. Finally, the control motor 63 drives each conveying roller 36 to operate automatically, thereby completing the conveying work normally.

[0057] The slitting assembly includes a rangefinder 64 fixed in the base frame 1 and an electric cutter 65 fixed in the base frame 1. The rangefinder 64 and the electric cutter 65 are electrically connected, and the measuring end of the rangefinder 64 is located in the roller pressing channel 35, and the cutting edge of the electric cutter 65 is located in the roller pressing channel 35.

[0058] With the above structure, the length of the paper web can be measured by the rangefinder 64. When a paper web of the appropriate threshold is input, the rangefinder 64 will activate the electric cutter 65 to cut the paper web.

[0059] A placement rack 66 is fixed on the base frame 1, and an adhesive storage tank 67 is placed on the placement rack 66. A pair of stirring rods 68 are rotatably connected inside the adhesive storage tank 67. A pair of drive motors 69 are fixed inside the adhesive storage tank 67, and the output shaft of each drive motor 69 is coaxially fixedly connected to the corresponding stirring rod 68. A tank cover 70 is threaded onto the adhesive storage tank 67, and a liquid pump 71 is fixed on the tank cover 70. The input end of the liquid pump 71 extends to the adhesive. At the bottom of the adhesive storage tank 67, a support frame 72 is fixed on the base frame 1. A brush holder 73 is fixed on the support frame 72. A bristle layer 74 is fixed at the bottom of the brush holder 73, and an adhesive storage cavity 75 is fixed inside the brush holder 73. An adhesive injection cavity 76 is opened inside the brush holder 73, and a piston 77 is slidably connected inside the adhesive injection cavity 76. A drive cavity 78 is opened inside the brush holder 73, and a push block 79 is provided inside the drive cavity 78. The push block 79 is fixedly connected to the piston 77. A drive rod 80 is rotatably connected inside the moving cavity 78. An extrusion block 81 is fixed to the drive rod 80. A push block 79 and the extrusion block 81 are mutually pressurized and engaged. A push spring 82 is fixed between the wall of the glue injection cavity 76 and the piston 77. A glue injection channel 83 is provided between the glue injection cavity 76 and the adhesive storage cavity 75. A one-way valve 84 is fixed inside the glue injection channel 83, leading to the glue injection cavity 76. A second glue injection channel 85 is provided between the glue injection cavity 76 and the brush layer 74. A one-way valve 86 is fixed inside the brush holder 75, directing the flow to the brush layer 74. A drive wheel 87 is rotatably connected to the bottom of the brush holder 73. A drive gear 88 and a drive gear 89 are rotatably connected inside the brush holder 73. The drive gear 88 and the drive gear 89 mesh with each other. The drive gear 88 and the drive wheel 87 are coaxially fixedly connected. The drive gear 89 and the drive rod 80 are coaxially fixedly connected. An indentation block 90 is fixed on the support frame 72.

[0060] With the above structure, the stirring rod 68 can be rotated by the drive motor 69 to prevent the adhesive in the adhesive storage tank 67 from solidifying. The liquid pump 71 inputs the adhesive in the adhesive storage tank 67 into the glue injection chamber 76. The drive wheel 87 contacts the paper web, causing the drive wheel 87 to rotate. After the drive wheel 87 rotates, it drives the drive gear 1 88 to rotate. The drive gear 1 88 drives the drive gear 2 89 to rotate. After the drive gear 2 89 rotates, it drives the drive rod 80 to rotate. After the drive rod 80 rotates, it drives the extrusion block 81 and the push block 79 to press and cooperate, thereby causing the piston 2 77 to move and inject the glue in the glue injection chamber 76 into the brush layer 74. The brush layer 74 contacts the edge of the paper web. When the paper web is folded by the folding roller 32, the edge sealing work is completed simultaneously. And the crease block 90 creases the fold line of the paper web, improving the effect and efficiency of subsequent folding.

[0061] Example 2

[0062] The technical feature that distinguishes Embodiment 2 from Embodiment 1 is that the starch content is 10 parts by weight.

[0063] Comparative Example 1

[0064] The technical feature that distinguishes Comparative Example 1 from Example 1 is that the weight of glycerol is 0.

[0065] Example 3

[0066] The technical feature that distinguishes Example 3 from Example 1 is that the weight of glycerol is 8 parts.

[0067] Comparative Example 2

[0068] The technical feature that distinguishes Comparative Example 2 from Example 1 is that the weight of jute fiber is 0 parts.

[0069] Example 4

[0070] The technical feature that distinguishes Example 4 from Example 1 is that the weight of jute fiber is 16 parts.

[0071] Example 5

[0072] The technical feature that distinguishes Example 5 from Example 1 is that the weight of jute fiber is 25 parts.

[0073] Comparative Example 3

[0074] The technical feature that distinguishes Comparative Example 3 from Example 1 is that the starch content is 0 parts by weight.

[0075] Example 6

[0076] The technical feature that distinguishes Example 6 from Example 1 is that the starch content is 30 parts by weight.

[0077] Comparative Example 4

[0078] The technical feature that distinguishes Comparative Example 4 from Example 1 is that the soybean protein gum has a weight of 0 parts.

[0079] Comparative Example 5

[0080] The technical feature that distinguishes Comparative Example 5 from Example 1 of the present invention is that the starch content is 55 parts by weight.

[0081] Comparative Example 6

[0082] The technical feature that distinguishes Comparative Example 6 from Example 1 is that the weight of glycerol is 15 parts.

[0083] Comparative Example 7

[0084] The technical feature that distinguishes Comparative Example 7 from Example 1 is that the soybean protein gum contains 30 parts by weight.

[0085] Example 7

[0086] The technical difference between Embodiment 7 and Embodiment 1 is that the equipment used in the preparation is processing equipment that can be purchased on the existing market.

[0087] Performance testing:

[0088] The paper bags prepared in the above embodiments and comparative examples were tested for various properties using the following national standards. The component proportions of each embodiment and comparative example are as follows: Figure 2 As shown, the specific inspection and testing standards are as follows:

[0089] 1. Take a 100mm×100mm packaging bag and, in accordance with standard GB / T16422.2—2014, spray the sample with deionized water and, under the conditions of maintaining the wavelength of the xenon arc lamp at 320~4210nm and the irradiation power at 150~180W / m2, determine the photodegradation rate of the packaging bag.

[0090] 2. Take a 100mm×100mm packaging bag and, in accordance with standard GB / T19277, maintain the system temperature at 54±2℃ and the humidity at 52~60% to determine the final release of carbon dioxide after 30 days of material degradation to determine the biodegradability of the packaging bag.

[0091] 3. Refer to standard GB / T24218.3-2010 "Textiles - Nonwovens - Test Methods - Part 3: Determination of breaking strength and elongation at break (strip method)"; set the strip width as 100mm×100mm, the tensile speed as 100mm / min; test instrument: fabric strength tester;

[0092] 4. Select samples, immerse them in water for 1 hour, remove them, and test their mechanical properties again to test their strength retention rate.

[0093] The performance test results of the packaging tapes prepared in Examples 1, 2, 5, 6 and 3 are as follows: Figure 3 As shown.

[0094] The performance test data from Examples 1-2, Example 6, and Comparative Examples 3 and 5 show that the amount of starch added significantly affects the performance of the packaging bag. When the amount of starch added is within the range specified in this invention, the overall performance of the resulting product is excellent, significantly improving the performance of the packaging bag. In the comparative examples where no starch was added, the photodegradation rate and biodegradation rate of the packaging bag remained essentially unchanged, but the tensile strength and elongation at break decreased significantly. This is because starch molecules can form molecular bonds with other components through their specific molecular structure, achieving coupling and effectively improving the molecular binding degree of the packaging bag, thereby improving its tensile strength and elongation at break. If the starch content of the packaging bag is too low, the components cannot effectively couple, leading to a decrease in tensile strength and elongation at break. However, if the starch content of the packaging bag is too high, a significant decrease in elongation at break occurs.

[0095] The performance test results of the rubber compounds prepared in Examples 1 and 3, and Comparative Examples 1 and 6 are as follows: Figure 4 As shown.

[0096] The performance test data from Examples 1 and 3, and Comparative Examples 1 and 6 show that the amount of glycerol added significantly affects the performance of the packaging bag. When glycerol is added within the range specified in this invention, the overall performance of the product is excellent, and the performance of the packaging bag can be significantly improved. When no glycerol is added in the comparative examples, the photodegradation rate and biodegradation rate of the packaging bag do not change much, but the tensile strength and elongation at break are significantly reduced. This is because glycerol, as a plasticizer, is embedded between the cellulose molecular chains, weakening the intermolecular forces and significantly improving the flexibility, tear resistance, and processing adaptability of the paper bag, preventing brittleness during folding or rolling. If the glycerol content is too high, the paper bag becomes too soft, affecting the tensile strength, elongation at break, and other properties.

[0097] The performance test results of the rubber compounds prepared in Examples 1, 4-5 and Comparative Example 2 are as follows: Figure 5 As shown.

[0098] The performance test data from Examples 1, 4-5, and Comparative Example 2 show that the amount of jute fiber added significantly affects the performance of the adhesive. When the amount of jute fiber added is within the range specified in this invention, the overall performance of the resulting product is not excellent, but a balance is achieved between performance and production cost. In the comparative example, when no jute fiber was added, the photodegradation rate and biodegradation rate of the packaging bag did not change significantly, but the tensile strength and elongation at break decreased significantly. This is because jute fiber can increase the hardness and toughness of the material, effectively improve the flexibility of the jute fiber, and form a connecting network inside the packaging bag to improve structural strength.

[0099] The performance test results of the rubber compounds prepared in Example 1, Comparative Example 7, Example 7 and Comparative Example 4 are as follows: Figure 6 As shown.

[0100] The performance test data from Examples 1, 7, 7, and 4 show that the amount of soybean protein gum added significantly affects the performance of the packaging bag. When the amount of soybean protein gum added is within the range specified in this invention, the resulting product exhibits excellent overall performance and can significantly improve the performance of the packaging bag. This invention, by adding soybean protein gum as a biodegradable material, allows for natural decomposition or direct consumption after disposal, significantly reducing plastic pollution. Through its air-blocking and water-locking properties, it maintains the moisture and flavor of food, extending its shelf life. Its rich internal nutrients and tendency to breed mold actually enhance the biodegradation effect.

[0101] In the preparation process of the biodegradable and environmentally friendly paper packaging bag of the present invention, the paper web is dehydrated, dried, laminated, folded, sealed, wrinkled, and cut by continuous roller pressing, so as to achieve the processing effect of paper web paper bags in an assembly line, improve the overall work efficiency, and reduce the space occupied by the equipment by rotating the roller pressing line of the preparation equipment.

[0102] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A biodegradable and environmentally friendly paper packaging bag, characterized in that, The base material of this biodegradable and environmentally friendly paper packaging bag is prepared from the following substances by weight: 100 parts virgin wood pulp, 15-30 parts starch, 6-10 parts glycerin, and 11-20 parts jute fiber. The coating of the biodegradable and environmentally friendly paper packaging bag is prepared from the following substances by weight: 50-70 parts of a mixture of waterborne polyurethane dispersion and acrylic emulsion in a 1:1 ratio, 0.2-0.5 parts of antifungal agent, and 0.8-2.5 parts of leveling agent and defoamer combined.

2. The biodegradable and environmentally friendly paper packaging bag according to claim 1, characterized in that, The leveling agent is prepared from the following substances by weight: 25-40 parts of hydrophobic modified polyurethane (HEUR) dispersion, 10-15 parts of deionized water, 0.3-0.5 parts of defoamer, and 0.5-1.5 parts of pH stabilizer.

3. The biodegradable and environmentally friendly paper packaging bag and its preparation process according to claim 1, characterized in that, The virgin wood pulp is added with a reinforcing agent, which is prepared from the following substances by weight: 60-70 parts soybean protein gum, 50-60 parts polyol polymer, and 20-30 parts isocyanate.

4. The preparation process of the biodegradable and environmentally friendly paper packaging bag according to any one of claims 1-3, characterized in that, The specific preparation process is as follows: S1. Substrate preparation: According to the raw material ratio, virgin wood pulp and starch are poured into a mixer and stirred. During the stirring process, an appropriate proportion of glycerol and jute fiber are added. After stirring and mixing in the mixer for 40-60 minutes, flocculent substrate is obtained. S2. Coating preparation: According to the raw material ratio, the mixture of hydrophobic modified polyurethane (HEUR) dispersion and acrylate emulsion in a 1:1 ratio, and deionized water are poured into a mixer and stirred. During the stirring process, an appropriate proportion of defoamer and pH stabilizer are added. After stirring in the mixer for 30-50 minutes, the packaging bag coating is obtained. S3. Dehydration and shaping: The flocculent substrate is sprayed onto the screen machine and initially dehydrated on the endless screen (metal mesh belt) to form a continuous wet paper web. The wet paper web is then placed into the roller pressing production line to squeeze out excess water and dried by hot press rollers to achieve drying and shaping. A coating is then applied to the paper surface to form a protective layer. S4. Stretching and bonding: The dried paper web is stretched through multiple continuous rollers in the roll forming line to eliminate surface wrinkles. During the stretching process, adhesive and the prepared packaging bag coating are applied to the paper web. The rollers control the paper web conveying angle so that the paper web is folded according to its width, so that the paper web can form a continuous simple paper bag. S5. Slitting and conveying: When the continuous simple paper bags are conveyed to the cutting structure of the roller pressing production line, the cutting structure cuts the continuous simple paper bags into individual paper bags as needed and conveys them onto the conveyor belt for easy subsequent work. S6. Installation components: The handle is fixed by gluing or punching holes and threading rope, and the bottom of the bag is sealed by heat sealing or folding and gluing to make a biodegradable and environmentally friendly paper packaging bag.

5. The preparation process of a biodegradable and environmentally friendly paper packaging bag according to claim 4, characterized in that, The temperature of the hot press roller in step S3 is above 100°C.

6. The preparation process of a biodegradable and environmentally friendly paper packaging bag according to claim 4, characterized in that, In step S1, 4-6 parts of disulfite are added during the stirring of the pulp flocculent material.

7. The preparation process of a biodegradable and environmentally friendly paper packaging bag according to claim 4, characterized in that, The roller pressing production line used in steps S3-S5 is a biodegradable and environmentally friendly paper packaging bag preparation equipment, including a base frame, a control frame fixed on the base frame, a flaring frame rotatably connected to the control frame, a servo motor fixed inside the control frame, the output shaft of the servo motor being coaxially fixedly connected to the flaring frame, a pair of control arms slidably connected inside the flaring frame, a pair of compression rollers arranged between the two control arms, a heating groove on the base frame, multiple heating and expansion rollers arranged inside the heating groove, a conveying cavity connected to the heating groove inside the flaring frame, the top opening of the conveying cavity communicating with the bottom of the flaring frame, a pair of drive rollers arranged inside the conveying cavity, and an adjusting roller rotatably connected to the bottom opening of the conveying cavity. There is a pair of control arms 2, and a pair of guide seats 1 are slidably connected between the two control arms 2. Each pair of guide seats 1 is rotatably connected to a corresponding guide seat and a stabilizing roller. A pair of bidirectional lead screws 6 are rotatably connected inside the base frame. A pair of output motors are fixed inside the base frame. The output shafts of the two output motors are coaxially fixedly connected to the corresponding bidirectional lead screws 6. The threaded sections on both sides of the bidirectional lead screws 6 are threadedly connected to the corresponding guide seats 1. A servo motor 2 is fixed inside one of the guide seats 1. The output shafts of the two servo motors 2 are coaxially fixedly connected to the corresponding stabilizing rollers. A coating liquid cavity is opened in the stabilizing roller near the base frame, and a bidirectional lead screw 1 is rotatably connected to the stabilizing roller near the base frame. One end of the bidirectional lead screw 1 is connected to the guide seat 1. A guide seat is fixedly connected to the shaft. A guide slider is slidably connected inside the stabilizing roller near the base frame. The guide slider is threadedly connected to a two-way lead screw. A pressure block is fixed on the guide slider. A spring groove is opened inside the stabilizing roller near the base frame. A pressure block is slidably connected inside the spring groove. An injection chamber is opened inside the stabilizing roller near the base frame. A piston is installed in the injection chamber. The piston is fixedly connected to the pressure block. The pressure block is in a pressing fit with the pressure block. A return spring is fixed between the pressure block and the bottom of the spring groove. An injection channel is opened between the coating liquid chamber and the injection chamber. A one-way valve is fixed inside the injection channel to the injection chamber. A coated sponge layer is fixed on the surface of the stabilizing roller near the base frame. The stabilizing roller has a liquid injection channel two, with the two ends of the liquid injection channel two connecting the liquid injection chamber and the coating sponge layer respectively. A one-way valve two is fixed in the liquid injection channel two, which flows to the coating sponge layer. A one-way valve interface that flows to the coating liquid chamber is fixed on the stabilizing roller near the base frame. A pair of folding rollers are vertically arranged on the side of the base frame. A pair of regulating arms three are slidably connected to the side of the base frame. A pair of flipping rollers are arranged between the two regulating arms three. A roller pressing channel is opened in the base frame. Multiple conveying rollers are arranged in the roller pressing channel. A protective cover plate that covers the roller pressing channel is hinged on the base frame. A storage cavity is opened in the base frame. A conveyor belt is arranged in the storage cavity. A cutting component is set at one end of the roller pressing channel. One end of the roller pressing channel is located directly above the conveyor belt.

8. The preparation process of a biodegradable and environmentally friendly paper packaging bag according to claim 7, characterized in that, Each of the two control arms 1 is slidably connected to a pair of guide seats 2. Each guide seat 2 is rotatably connected to a corresponding extrusion roller, and each guide seat 2 is fixed with a servo motor 3. The output shaft of each servo motor 3 is coaxially fixedly connected to the corresponding extrusion roller. A pair of servo motors 4 are fixedly installed inside the flaring frame, and a pair of control screws 1 are rotatably connected inside the flaring frame. Each control screw 1 is coaxially fixedly connected to a corresponding servo motor 4, and each control screw 1 is threadedly connected to a corresponding control arm 1. A servo motor 5 is rotatably connected inside each control arm 1, and a bidirectional screw 2 is rotatably connected inside each control arm 1. Each servo motor 5 is coaxially connected to the corresponding bidirectional screw 2. The system is fixedly connected, with the threaded sections on both sides of each bidirectional lead screw 2 threadedly connected to the corresponding guide seat 2. A pair of servo motors 6 are fixedly installed inside the control frame, and a bidirectional lead screw 3 is rotatably connected within the control frame. The output shafts of both servo motors 6 are coaxially fixedly connected to the corresponding bidirectional lead screw 3. Two pairs of guide seats 3 are slidably connected within the control frame, and a servo motor 7 is fixed within each pair of guide seats 3. The output shaft of each servo motor 7 is coaxially fixedly connected to the corresponding drive roller. The threaded sections on both sides of each bidirectional lead screw 3 are threadedly connected to the corresponding guide seat 3. A pair of guide grooves are provided on the base frame, and multiple guide seats 4 are arranged on each pair of guide grooves. A guide roller is fixed within each guide groove. Each guide slide rod is connected to a corresponding guide seat four, and both ends of each heated expansion roller are rotatably connected to the corresponding guide seat four. Each guide seat four is threaded with a limit bolt, the bottom end of which is fixed with an anti-slip rubber layer and pressed against the base frame surface for limiting engagement. Each heated expansion roller contains a heating element. A pair of servo motors eight are fixed inside the base frame, and a control screw two is rotatably connected inside the base frame. The output shaft of each servo motor eight is coaxially fixedly connected to the corresponding control screw two. Each control screw two is threadedly connected to a corresponding control arm three, and a bidirectional screw four is rotatably connected to each control arm three. A servo motor nine is fixed inside each control arm three. The output shafts of each servo motor nine are coaxially fixedly connected to the corresponding bidirectional lead screw four. Each control arm three is slidably connected to a pair of guide seats five. The two threaded sections of each bidirectional lead screw four are threadedly connected to the corresponding guide seats five. Each guide seat five is rotatably connected to the corresponding folding roller. The bidirectional lead screw five is rotatably connected inside the base frame. The threaded sections on both sides of the bidirectional lead screw five are threadedly connected to guide seats six. Each guide seat six is ​​rotatably connected to the corresponding folding roller. A servo motor ten is fixed on the base frame. The output shaft of the servo motor ten is coaxially fixedly connected to the bidirectional lead screw five. Multiple control motors are fixed inside the base frame. The output shaft of each control motor is coaxially fixedly connected to the corresponding conveying roller.

9. The preparation process of a biodegradable and environmentally friendly paper packaging bag according to claim 7, characterized in that, The cutting assembly includes a rangefinder fixed inside the base frame and an electric cutter fixed inside the base frame. The rangefinder and the electric cutter are electrically connected, and the measuring end of the rangefinder is located inside the roller pressing channel, while the cutting edge of the electric cutter is located inside the roller pressing channel.

10. The preparation process of a biodegradable and environmentally friendly paper packaging bag according to claim 1, characterized in that, A placement cylinder frame is fixed on the base frame, and an adhesive storage tank is placed on the placement cylinder frame. A pair of stirring rods are rotatably connected inside the adhesive storage tank. A pair of drive motors are fixed inside the adhesive storage tank, and the output shaft of each drive motor is coaxially fixedly connected to the corresponding stirring rod. A tank lid is threaded onto the adhesive storage tank, and a liquid pump is fixed on the tank lid. The input end of the liquid pump extends to the bottom of the adhesive storage tank. A support frame is fixed on the base frame, and a brush frame is fixed on the support frame. A bristle layer is fixed at the bottom of the brush frame, and an adhesive storage cavity is fixed inside the brush frame. An adhesive injection cavity is opened in the brush frame, and a piston is slidably connected in the adhesive injection cavity. A drive cavity is opened in the brush frame, and a push block is set in the drive cavity. The push block is fixedly connected to the piston. The drive chamber is rotatably connected to a drive rod, and a pressing block is fixed on the drive rod. The push block and the pressing block press against each other. A push spring is fixed between the wall of the glue injection chamber and the piston. A glue injection channel one is opened between the glue injection chamber and the adhesive storage chamber. A one-way valve three is fixed in the glue injection channel one, which flows to the glue injection chamber. A glue injection channel two is opened between the glue injection chamber and the brush bristle layer. A one-way valve four is fixed in the glue injection channel two, which flows to the brush bristle layer. A drive wheel is rotatably connected to the bottom of the brush holder. A drive gear one is rotatably connected to the brush holder. A drive gear two is rotatably connected to the brush holder. Drive gear one and drive gear two mesh. Drive gear one and drive wheel are coaxially fixedly connected. Drive gear two is coaxially fixedly connected to the drive rod. An indentation block is fixed on the support frame.

Images