Paper-plastic composite packaging bag edge folding device

Abstract

The utility model relates to the field of paper-plastic composite packaging bag production, in particular to a paper-plastic composite packaging bag edge folding device which comprises a supporting bottom frame and pressing wheel sets installed on the two sides of the supporting bottom frame in the width direction, and each pressing wheel set comprises a first pressing wheel, a second pressing wheel and a third pressing wheel. The upper end face and the lower end face of the first pressing wheel are each provided with a plurality of air exhaust channels in a circumferential array mode, the air exhaust channels are symmetrically distributed up and down, a plurality of air blowing channels are arranged on the circumferential wall of the first pressing wheel in a circumferential array mode, an air inlet channel and an air outlet channel are formed in the first pressing wheel, and the air inlet channel communicates with the input ends of the air blowing channels. The air outlet channel communicates with the input end of the air exhaust channel. According to the folding device, the side edge of the coiled material is blown through the blowing channel, so that the side edge of the coiled material is concavely deformed, and the coiled material is adsorbed to be close to the end face of the first pressing wheel through the exhaust channel, so that the folding position of the composite paper-plastic coiled material is accurately controlled, the production defect rate is reduced, and the working quality of the folding device is improved.

Description

Technical Field

[0001] The present application relates to the field of production of paper-plastic composite packaging bags, and in particular to a folding device for paper-plastic composite packaging bags. Background Art

[0002] Kraft paper and plastic film are processed by a laminating machine to form a composite paper-plastic roll (hereinafter referred to as the roll). When the roll is formed into a paper-plastic composite packaging bag, in order to improve the aesthetics and ease of use of the paper-plastic composite packaging bag, the two side edges of the roll need to be folded and shaped.

[0003] The current folding device mainly includes an inner support component, a pressure roller group and a folding and shaping component. During the movement of the coil, the inner support component extends into the coil to support the coil, at which time the surface of the coil bulges, and then the pressure roller group bends the two sides of the coil downward to the coil surface below, and finally the folding and shaping component folds the two sides of the coil.

[0004] Most folding methods use rollers of different thicknesses to continuously fold the uncut coils. However, when the rollers fold the coils, it is not easy to control the folding position of the coils. Once the folding position of the coils is offset and not in the center, the quality and appearance of the subsequent packaging bags will be affected. When the folding device is working continuously, if there is a problem with the folding of one section of the coil, it will also affect the folding quality of the subsequent coils. Utility Model Content

[0005] In order to accurately control the folding position of a composite paper-plastic coil, reduce the production defect rate, and improve the working quality of the folding device, the present application provides a paper-plastic composite packaging bag folding device.

[0006] The paper-plastic composite packaging bag folding device provided in this application adopts the following technical solution:

[0007] A folding device for a paper-plastic composite packaging bag comprises a supporting base frame and a pressing wheel group installed on both sides of the supporting base frame along its own width direction, the pressing wheel group comprises a first pressing wheel, a second pressing wheel and a third pressing wheel arranged at intervals along the length direction of the supporting base frame, the upper end face and the lower end face of the first pressing wheel are both provided with a plurality of exhaust channels in a circumferential array, the exhaust channels are arranged symmetrically up and down, the circumferential wall of the first pressing wheel is provided with a plurality of blowing channels in a circumferential array, the first pressing wheel is provided with an air inlet channel and an air outlet channel, the air inlet channel is connected to the input end of the blowing channel, and the air outlet channel is connected to the input end of the exhaust channel.

[0008] By adopting the above technical solution, air is blown to the side of the coil through the air blowing channel, causing an inward concave deformation on the side of the coil. As the coil deforms, the upper and lower surfaces of the coil approach the upper and lower end faces of the first pressing wheel. A negative air pressure is formed between the surface of the coil and the end face of the first pressing wheel through the air extraction channel, enabling the surface of the coil to quickly adhere to the end face of the first pressing wheel, controlling the crease position of the coil, thereby accurately controlling the edge folding position of the composite paper-plastic coil, reducing the production defect rate, and improving the working quality of the edge folding device.

[0009] Optionally, the air blowing channel and the air extraction channel are arranged at intervals and staggered in the horizontal plane.

[0010] By adopting the above technical solution, the air extraction channel and the air blowing channel are arranged in a staggered manner. On the one hand, it can avoid the mutual interference between airflows. When the air blowing channel blows air at the bending point of the coil, the air extraction channel can suck air from the two surfaces of the coil, so as to accelerate the deformation time of the coil and enhance the edge folding effect.

[0011] Optionally, the output end of the air extraction channel is located at the end face of the first pressing wheel. The input end of the air extraction channel is arranged obliquely along the direction close to the center of the first pressing wheel. An air outlet is coaxially opened on the lower surface of the first pressing wheel, and the air outlet is communicated with one end of the air outlet channel far from the air extraction channel. A first connection component for connecting the air extractor to the air outlet of the first pressing wheel is arranged on the support chassis.

[0012] By adopting the above technical solution, through the first connection component, the air extractor can guide the air flow in the air extraction channel to move towards the air outlet channel. Due to the inclined arrangement of the air extraction channel, the air flow between the air extraction channel and the side of the coil obliquely flows into the air extraction channel, thereby guiding the side of the coil to incline and approach the first pressing wheel, so as to facilitate the rapid bending of the periphery of the coil during edge folding.

[0013] Optionally, the caliber of the output end of the air extraction channel is larger than that of the input end, and the inclination angle range between the air extraction channel and the axis of the first pressing wheel is 30 degrees to 45 degrees.

[0014] By adopting the above technical solution, the increase in the caliber of the output end of the air extraction channel can increase the air extraction range, so as to increase the deformation area of the surface of the coil, which is beneficial to the edge folding of the coil. By limiting the inclination angle of the air extraction channel, it is convenient for the air extraction channel to apply suction to the surface of the coil far from the side as much as possible, improving the edge folding effect of the coil.

[0015] Optionally, the first connection component includes a first bracket, an air outlet pipe, a first bearing, and a first connecting pipe. The first bracket is installed on the support chassis and is located below the first pressing wheel. The first bracket is provided with a first interface for the coaxial rotation and insertion of the air outlet pipe. The first bearing is coaxially installed in the first interface and is coaxially connected to the air outlet pipe. The top end of the air outlet pipe is inserted into the air outlet and connected to the first pressing wheel. The air outlet pipe is provided with a first ventilation hole communicating with the air outlet channel. One end of the first connecting pipe is threadedly connected to the bottom of the first interface, and the other end is used to connect to an air extractor. A first sealing ring is provided between the first connecting pipe and the air outlet pipe.

[0016] By adopting the above technical solution, the first pressing wheel can be supported by the air outlet pipe and the first bearing without affecting the rotation of the first pressing wheel as the coiled material moves. The air extractor and the air outlet pipe can be connected through the first connecting pipe and the first bracket. The first sealing ring can prevent the weakening of the air flow intensity in the air extraction channel caused by gas leakage.

[0017] Optionally, the caliber of the output end of the air blowing channel is smaller than that of the input end of the air blowing channel. The upper surface of the first pressing wheel is coaxially provided with an air inlet. The end of the air inlet channel far from the air blowing channel communicates with the air inlet. A second connection component for connecting an air pump and the air inlet of the first pressing wheel is provided on the support chassis.

[0018] By adopting the above technical solution, the second connection component facilitates the connection of an external air pump to supply gas to the air blowing channel. The reduction of the caliber of the output end of the air blowing channel can strengthen the air flow ejection force, so that when the coiled material is bent, the position hit by the air flow can quickly bend and deform, realizing precise control of the bending position of the coiled material.

[0019] Optionally, the second connection component includes a second bracket, an air inlet pipe, a second bearing, and a second connecting pipe. The second bracket is installed on the support chassis and its top is located above the first pressing wheel. The second bracket is provided with a second interface for the coaxial rotation and insertion of the air inlet pipe. The second bearing is coaxially installed in the second interface and is coaxially connected to the air inlet pipe. The top end of the air inlet pipe is inserted into the air inlet and connected to the first pressing wheel. The air inlet pipe is provided with a second ventilation hole communicating with the air inlet channel. The second connecting pipe is threadedly connected to the top of the second interface. A second sealing ring is provided between the second connecting pipe and the air inlet pipe.

[0020] By adopting the above technical solution, the first pressing wheel can be supported by the air inlet pipe and the second bearing without affecting the rotation of the first pressing wheel as the coiled material moves. The air pump and the air inlet pipe can be connected through the second connecting pipe and the second bracket. The second sealing ring can prevent the weakening of the air flow intensity in the air blowing channel caused by gas leakage.

[0021] Optionally, input pinch rollers and output pinch rollers are respectively arranged on both sides of the supporting chassis along its length direction. The press wheel set is located between the input pinch roller and the output pinch roller. The input pinch roller is close to the first press wheel. An auxiliary pinch roller is arranged below the input pinch roller on the supporting chassis. The first press wheel is located between the input pinch roller and the auxiliary pinch roller.

[0022] By adopting the above technical solution, the positions of the coil material to be flanged can be limited by the input pinch roller and the auxiliary pinch roller, so that the center of the flange of the coil material can contact and deform with the first press wheel, thereby adjusting the flange position of the coil material, so as to improve the working quality of the flanging device.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] By blowing air through the air blowing channel on the side of the coil material, an inward concave deformation is generated on the side of the coil material. As the coil material deforms, a negative air pressure is formed between the surface of the coil material and the end face of the first press wheel through the air extraction channel, so that the surface of the coil material quickly adheres to the end face of the first press wheel, thereby accurately controlling the flanging position of the composite paper-plastic coil material, reducing the production defect rate, and improving the working quality of the flanging device;

[0025] The air extraction channel and the air blowing channel are arranged in an alternating manner. On the one hand, it can avoid the mutual interference between airflows. On the other hand, when the air blowing channel blows air at the bending point of the coil material, the air extraction channel can suck air from the two surfaces of the coil material, so as to accelerate the deformation time of the coil material and enhance the flanging effect;

[0026] The diameter of the output end of the air extraction channel is increased, which can increase the air extraction range, so as to increase the deformation area of the surface of the coil material, which is beneficial to the flanging of the coil material. By limiting the inclination angle of the air extraction channel, the air extraction channel can apply suction to the surface of the coil material far from the side as much as possible, improving the flanging effect of the coil material. Description of the Drawings

[0027] Figure 1 is the overall position schematic diagram of the embodiment of the present application.

[0028] Figure 2 is the position schematic diagram of the first press wheel, the first connection component and the second connection component in the embodiment of the present application.

[0029] Figure 3 is the top view of the connection part between the first press wheel and the second bracket in the embodiment of the present application.

[0030] Figure 4 is Figure 3 the schematic diagram of the A-A cross-section in

[0031] Description of the Reference Numerals:

[0032] 1. Support chassis; 2. Pressing wheel group; 21. First pressing wheel; 211. Air extraction channel; 212. Air blowing channel; 213. Air inlet channel; 214. Air outlet channel; 215. Air outlet; 216. Air inlet; 22. Second pressing wheel; 23. Third pressing wheel; 3. First connection assembly; 31. First bracket; 311. First interface; 32. Air outlet pipe; 321. First ventilation hole; 33. First bearing; 34. First connecting pipe; 35. First sealing ring; 4. Second connection assembly; 41. Second bracket; 411. Second interface; 42. Air inlet pipe; 421. Second ventilation hole; 43. Second bearing; 44. Second connecting pipe; 45. Second sealing ring; 5. Input pressing roller; 6. Output pressing roller; 7. Auxiliary pressing roller. Detailed implementation mode

[0033] The following is a further detailed description of this application in conjunction with the attached Figures 1-4 drawings.

[0034] It should be noted that in the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0035] The embodiment of this application discloses a hemming device for a paper-plastic composite packaging bag.

[0036] Referring to Figure 1 and Figure 2 , the hemming device includes a support chassis 1, a pressing wheel group 2 installed on both sides of the support chassis 1 along its width direction, and an input pressing roller 5 and an output pressing roller 6 respectively installed on both sides of the support chassis 1 in the length direction. The pressing wheel group 2 is located between the input pressing roller 5 and the output pressing roller 6.

[0037] Among them, the pressing wheel group 2 includes a first pressing wheel 21, a second pressing wheel 22 and a third pressing wheel 23 arranged at intervals along the length direction of the support chassis 1. The input pressing roller 5 is close to the first pressing wheel 21. An auxiliary pressing roller 7 is arranged below the input pressing roller 5 on the support chassis 1, and the first pressing wheel 21 is located between the input pressing roller 5 and the auxiliary pressing roller 7.

[0038] In addition, as Figure 3 and Figure 4As shown in the figure, a plurality of air extraction channels 211 are arranged in a circumferential array on both the upper end surface and the lower end surface of the first pressing wheel 21, and the air extraction channels 211 are arranged symmetrically up and down. A plurality of air blowing channels 212 are arranged in a circumferential array on the peripheral wall of the first pressing wheel 21. An air inlet channel 213 and an air outlet channel 214 are formed in the first pressing wheel 21. The air inlet channel 213 is communicated with the input end of the air blowing channel 212, and the air outlet channel 214 is communicated with the input end of the air extraction channel 211.

[0039] When folding the edge of the coil material, the coil material first enters between the input pressing roller 5 and the auxiliary pressing roller 7, and then the coil material moves to the position of the first pressing wheel 21. The side of the coil material is blown by the air blowing channel 212 to cause an inward concave deformation on the side of the coil material. As the coil material deforms, the upper and lower surfaces of the coil material approach the upper and lower end surfaces of the first pressing wheel 21. A negative air pressure is formed between the surface of the coil material and the end surface of the first pressing wheel 21 through the air extraction channel 211, so that the surface of the coil material quickly adheres to the end surface of the first pressing wheel 21, and the crease position of the coil material is controlled (the deformation state of the coil material at the first pressing wheel 21 is shown in the attached Figure 3 instruction manual). Then the coil material passes through the second pressing wheel 22 and the third pressing wheel 23 in sequence, and finally moves out from the output pressing roller 6, thereby accurately controlling the edge folding position of the composite paper-plastic coil material as a whole, reducing the production defect rate, and improving the working quality of the edge folding device.

[0040] To avoid the interference of the air flow between the air blowing channel 212 and the air extraction channel 211, referring to Figure 2 , the air blowing channel 212 and the air extraction channel 211 are arranged at intervals and staggered in the horizontal plane. When the air blowing channel 212 blows air at the bending point of the coil material, the air extraction channel 211 can suck air from the two surfaces of the coil material to facilitate accelerating the deformation time of the coil material and enhancing the edge folding effect.

[0041] Referring to Figure 4 , the output end of the air extraction channel 211 is located at the end surface of the first pressing wheel 21, and the diameter of the output end of the air extraction channel 211 is larger than that of the input end. The air extraction range can be increased, so as to increase the deformation area of the surface of the coil material, which is beneficial to the edge folding of the coil material.

[0042] In order to enable the air extraction channel 211 to apply suction force to the surface of the coil material far from the side as much as possible and improve the edge folding effect of the coil material, as shown in Figure 4 , the input end of the air extraction channel 211 is arranged obliquely along the direction close to the center of the first pressing wheel 21, and the included angle between the air extraction channel 211 and the axis of the first pressing wheel 21 ranges from 30 degrees to 45 degrees.

[0043] Referring to Figure 2 and Figure 4, an air outlet 215 is coaxially formed on the lower surface of the first pressing wheel 21. The air outlet 215 is communicated with one end of the air outlet passage 214 away from the air extraction passage 211. A first connection assembly 3 for connecting an air extractor and the air outlet 215 of the first pressing wheel 21 is arranged on the supporting chassis 1.

[0044] Among them, the first connection assembly 3 includes a first bracket 31, an air outlet pipe 32, a first bearing 33 and a first connection pipe 34. The first bracket 31 is installed on the supporting chassis 1 and is located below the first pressing wheel 21. A first interface 311 for the air outlet pipe 32 to be coaxially and rotatably inserted is formed on the first bracket 31. The first bearing 33 is coaxially installed in the first interface 311 and is coaxially connected with the air outlet pipe 32. The top end of the air outlet pipe 32 is inserted into the air outlet 215 and is connected with the first pressing wheel 21. A first ventilation hole 321 communicated with the air outlet passage 214 is formed on the air outlet pipe 32. One end of the first connection pipe 34 is threadedly connected to the bottom of the first interface 311 and the other end is used for connecting the air extractor. A first sealing ring 35 is arranged between the first connection pipe 34 and the air outlet pipe 32.

[0045] When the first pressing wheel 21 rotates, the first pressing wheel 21 can be supported by the air outlet pipe 32 and the first bearing 33 without affecting the rotation of the first pressing wheel 21 as the coiled material moves. The first connection pipe 34 and the first bracket 31 can realize the connection between the air extractor and the air outlet pipe 32. Since the air extractor is an existing device, it is not shown in the attached drawings of the specification. The first sealing ring 35 can prevent the weakening of the air flow intensity of the air extraction passage 211 caused by gas leakage.

[0046] Refer to Figure 2 and Figure 4 , the caliber of the output end of the air blowing passage 212 is smaller than that of the input end of the air blowing passage 212, so as to strengthen the intensity of the air flow ejection, so that when the coiled material is bent, the position hit by the air flow can be quickly bent and deformed, so as to realize the precise control of the bending position of the coiled material. An air inlet 216 is coaxially formed on the upper surface of the first pressing wheel 21. One end of the air inlet passage 213 away from the air blowing passage 212 is communicated with the air inlet 216. A second connection assembly 4 for connecting an air pump and the air inlet 216 of the first pressing wheel 21 is arranged on the supporting chassis 1.

[0047] Among them, the second connecting component 4 includes a second bracket 41, an air inlet pipe 42, a second bearing 43 and a second connecting pipe 44. The second bracket 41 is installed on the supporting chassis 1 and its top is located above the first pressing wheel 21. The second bracket 41 is provided with a second interface 411 for the coaxial rotation insertion of the air inlet pipe 42. The second bearing 43 is coaxially installed in the second interface 411 and is coaxially connected to the air inlet pipe 42. The top end of the air inlet pipe 42 is inserted into the air inlet 216 and is connected to the first pressing wheel 21. The air inlet pipe 42 is provided with a second ventilation hole 421 communicating with the air inlet passage 213. The second connecting pipe 44 is threadedly connected to the top of the second interface 411, and a second sealing ring 45 is arranged between the second connecting pipe 44 and the air inlet pipe 42.

[0048] When jetting air onto the coil material, the first pressing wheel 21 can be supported by the air inlet pipe 42 and the second bearing 43 without affecting the rotation of the first pressing wheel 21 as the coil material moves. The second connecting pipe 44 and the second bracket 41 can realize the connection between the air pump and the air inlet pipe 42. Since the air pump itself is an existing device and the connection mode between the air pump and the second connecting pipe 44 can also adopt a conventional connection mode, it is not shown in the attached drawings of the specification. The second sealing ring 45 can prevent the weakening of the air flow intensity in the air blowing channel 212 caused by gas leakage.

[0049] The implementation principle of the paper-plastic composite packaging bag hemming device in the embodiment of the present application is as follows: when hemming the coil material, the coil material first enters between the input pressing roller 5 and the auxiliary pressing roller 7, and then the coil material moves to the position of the first pressing wheel 21. The side of the coil material is blown through the air blowing channel 212 to cause an inward concave deformation of the side of the coil material. As the coil material deforms, the upper and lower surfaces of the coil material approach the upper and lower end faces of the first pressing wheel 21. Subsequently, the air extraction channel 211 forms a negative air pressure between the surface of the coil material and the end face of the first pressing wheel 21, so that the surface of the coil material quickly adheres to the end face of the first pressing wheel 21, and the hemming position of the coil material is controlled. Then the coil material passes through the second pressing wheel 22 and the third pressing wheel 23 in sequence, and finally moves out from the output pressing roller 6. Finally, the hemming position of the composite paper-plastic coil material is accurately controlled as a whole, reducing the production defect rate and improving the working quality of the hemming device.

[0050] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A folding device for a paper-plastic composite packaging bag, characterized in that: The invention comprises a supporting base frame (1) and a pressing wheel group (2) installed on both sides of the supporting base frame (1) along its width direction, the pressing wheel group (2) comprising a first pressing wheel (21), a second pressing wheel (22) and a third pressing wheel (23) arranged at intervals along the length direction of the supporting base frame (1), the upper end surface and the lower end surface of the first pressing wheel (21) are both provided with a plurality of exhaust channels (211) in a circumferential array, the exhaust channels (211) are arranged symmetrically up and down, the peripheral wall of the first pressing wheel (21) is provided with a plurality of blowing channels (212) in a circumferential array, the first pressing wheel (21) is provided with an air inlet channel (213) and an air outlet channel (214), the air inlet channel (213) is connected to the input end of the blowing channel (212), and the air outlet channel (214) is connected to the input end of the exhaust channel (211).

2. The folding device for a paper-plastic composite packaging bag according to claim 1, characterized in that: The blowing channels (212) and the exhaust channels (211) are arranged alternately at intervals on a horizontal plane.

3. The folding device for a paper-plastic composite packaging bag according to claim 1, characterized in that: The output end of the air extraction channel (211) is located on the end surface of the first pressure wheel (21), and the input end of the air extraction channel (211) is arranged obliquely along the center of the first pressure wheel (21). An air outlet (215) is coaxially provided on the lower surface of the first pressure wheel (21), and the air outlet (215) is connected to an end of the air outlet channel (214) away from the air extraction channel (211). A first connecting component (3) for connecting the air extractor and the air outlet (215) of the first pressure wheel (21) is provided on the supporting base frame (1).

4. The folding device for a paper-plastic composite packaging bag according to claim 3, characterized in that: The caliber of the output end of the air extraction channel (211) is larger than the caliber of the input end, and the inclined angle between the air extraction channel (211) and the axis of the first pressing wheel (21) ranges from 30 degrees to 45 degrees.

5. The folding device for a paper-plastic composite packaging bag according to claim 3, characterized in that: The first connecting assembly (3) comprises a first bracket (31), an air outlet pipe (32), a first bearing (33) and a first connecting pipe (34). The first bracket (31) is mounted on the supporting base frame (1) and is located below the first pressure wheel (21). The first bracket (31) is provided with a first interface (311) for the air outlet pipe (32) to be coaxially rotated and inserted. The first bearing (33) is coaxially mounted on the first interface (311) and is coaxially connected to the air outlet pipe (32). The top end of the air outlet pipe (32) is inserted into the air outlet port (215) and connected to the first pressure wheel (21). The air outlet pipe (32) is provided with a first vent hole (321) that is connected to the air outlet channel (214). One end of the first connecting pipe (34) is threadedly connected to the bottom of the first interface (311) and the other end is used for connecting to the vacuum pump. A first sealing ring (35) is provided between the first connecting pipe (34) and the air outlet pipe (32).

6. The folding device for a paper-plastic composite packaging bag according to claim 1, characterized in that: The caliber of the output end of the blowing channel (212) is smaller than the caliber of the input end of the blowing channel (212); an air inlet (216) is coaxially provided on the upper surface of the first pressing wheel (21); an end of the air inlet channel (213) away from the blowing channel (212) is connected to the air inlet (216); and a second connecting component (4) for connecting the air pump and the air inlet (216) of the first pressing wheel (21) is provided on the supporting base frame (1).

7. The folding device for a paper-plastic composite packaging bag according to claim 6, characterized in that: The second connecting assembly (4) comprises a second bracket (41), an air intake pipe (42), a second bearing (43) and a second connecting pipe (44); the second bracket (41) is mounted on the supporting base frame (1) and the top thereof is located above the first pressure wheel (21); the second bracket (41) is provided with a second interface (411) for the air intake pipe (42) to be coaxially rotated and inserted; the second bearing (43) is coaxially mounted on the second interface (411) and is coaxially connected to the air intake pipe (42); the top end of the air intake pipe (42) is inserted into the air intake port (216) and is connected to the first pressure wheel (21); the air intake pipe (42) is provided with a second vent hole (421) which is connected to the air intake channel (213); the second connecting pipe (44) is threadedly connected to the top of the second interface (411); a second sealing ring (45) is provided between the second connecting pipe (44) and the air intake pipe (42).

8. The folding device for a paper-plastic composite packaging bag according to claim 1, characterized in that: The supporting base frame (1) is provided with an input pressing roller (5) and an output pressing roller (6) on both sides along its length direction, respectively; the pressing wheel group (2) is located between the input pressing roller (5) and the output pressing roller (6); the input pressing roller (5) is close to the first pressing roller (21); the supporting base frame (1) is provided with an auxiliary pressing roller (7) below the input pressing roller (5); the first pressing roller (21) is located between the input pressing roller (5) and the auxiliary pressing roller (7).

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