CN114368177A

CN114368177A - Preparation method of paper-plastic glue-free composite film

Info

Publication number: CN114368177A
Application number: CN202210047759.XA
Authority: CN
Inventors: 杨俊辉; 丁征宇; 祁少利; 刘菲; 黄振洪
Original assignee: Jiangxi Guande New Material Technology Co ltd
Current assignee: Jiangxi Guande New Material Technology Co ltd
Priority date: 2022-01-17
Filing date: 2022-01-17
Publication date: 2022-04-19

Abstract

The invention belongs to the technical field of composite film preparation, and particularly relates to a preparation method of a paper-plastic glue-free composite film. According to the invention, after the polypropylene particles are crushed, the polypropylene particle treatment product meeting the specification is screened by wind power and then conveyed to the mixing drum for mixing, so that the screened polypropylene particles have smaller specification, are easier to melt in the subsequent processing process, and the overall processing efficiency is improved.

Description

Preparation method of paper-plastic glue-free composite film

Technical Field

The invention relates to the technical field of composite film preparation, in particular to a preparation method of a paper-plastic glue-free composite film.

Background

The paper-plastic glue-free composite film can be directly compounded with paper without glue at a certain temperature and under a certain pressure, and a drying tunnel flow necessary in the traditional process is not needed, so that the paper-plastic glue-free composite film is a novel BOPP film product, the problems of environmental pollution caused by the traditional film laminating process and residual VOC in the product are thoroughly solved, simultaneously, energy and equipment space are effectively saved, the production cost is greatly reduced, the paper-plastic glue-free composite film has revolutionary significance in the aspects of energy conservation and environmental protection, all indexes of the paper-plastic composite product of the glue-free composite film accord with the environmental protection standards of developed countries and regions such as Europe and America, and the paper-plastic glue-free composite film is particularly suitable for processing and exporting high-grade printing laminated products.

The paper-plastic glue-free composite film is in the production process, the finished polypropylene particles need to be subjected to hot melting and then added with the bifunctional compatilizer and the modified material, and then the paper-plastic glue-free composite film is subjected to extrusion molding, so that the whole plasticizing process is slow in direct addition to a casting machine due to different specifications of the finished polypropylene particles, and the large-particle polypropylene particles easily cause blockage of a conveying pipeline to influence the whole conveying effect.

Disclosure of Invention

The invention provides a preparation method of a paper-plastic glue-free composite film, which comprises the following steps:

s1: preparing raw materials: the polypropylene particles are put into pretreatment equipment for treatment and then conveyed, and the bifunctional compatibilizer, the modified material and the treated polypropylene particles are put into a mixing cylinder for mixing and stirring;

s2: semi-film forming preparation: feeding the raw materials and the resin into a casting machine for plasticizing and equally dividing, filtering by a filter, shunting, and extruding by quenching operation;

s3: film finished product: the semi-formed film is stretched into a film with uniform thickness in a two-way mode, and then is drawn into a roll after corona or flame treatment, and is cut and packaged;

wherein, pre treatment facilities includes two broken grain processing casees, two the rectangular hole has all been seted up to the bottom of broken grain processing case, and the inner wall fixedly connected with base of blowing of rectangular hole, and the base of blowing comprises bellows and blowing board, and the board of blowing is located the inside of broken grain processing case, the inside of broken grain processing case is provided with broken grain subassembly, and the top of broken grain subassembly is provided with inhales a grain pipe, inhales the lower port inner wall fixedly connected with grid tray, two fixedly connected with suction box between the broken grain processing case, fixed connection between the both ends of suction box respectively with the inhaling of both sides grain pipe, and the downside outer wall fixedly connected with transfer pipe of suction box.

Preferably, broken grain subassembly includes that two fixed axostylus axostyles and a plurality of half attach the axostylus axostyle, and two fixed axostylus axostyles are located not co-altitude, and a plurality of half attach the outside that the axostylus axostyle is located two fixed axostylus axostyles and be the equidistance and distribute, and the both ends of two fixed axostylus axostyles respectively with broken grain treatment box's both sides inner wall swing joint, the first gear that drags of the equal fixedly connected with in one end outside of two fixed axostylus axostyles.

Preferably, a cylindrical hole groove is formed in the grain breaking treatment box, a first motor is fixedly connected to the inner wall of the cylindrical hole groove, the output end of the first motor is connected with a short shaft through a coupler, a first driving gear is fixedly connected to the other end of the short shaft, and the first driving gear is meshed with the first driving gear through a tooth groove.

Preferably, the fixed broken grain ball of a plurality of equidistance of outside fixedly connected with of fixed axostylus axostyle, and half attach and be provided with the broken grain ball of a plurality of equidistance activity on the axostylus axostyle, equal fixedly connected with reset spring between a plurality of movable broken grain balls, reset spring's the other end and half attach fixed connection between the axostylus axostyle, the outside of fixed broken grain ball and activity broken grain ball all is provided with a plurality of coniform archs.

Preferably, two fixedly connected with backing plate between the broken grain processing case, the upside outer wall fixedly connected with air pump of backing plate, the output fixedly connected with gas-supply pipe of air pump, the other end fixedly connected with tap-off ware of gas-supply pipe, and the both ends mouth of tap-off ware respectively fixedly connected with bronchus, the other end of bronchus respectively with two bellows between fixedly connected with.

Preferably, rectangular hole groove has been seted up on the case that induced drafts, the inner wall fixedly connected with air current valve in rectangular hole groove, and the inside of air current valve is provided with the leaf that flow equalizes of a plurality of equidistance, lies in the port fixedly connected with graticule mesh of the incasement that induced drafts on the air current valve, and the equal fixedly connected with lug of the upper and lower both sides outer wall of air current valve, the equal fixedly connected with a plurality of equidistance of one side outer wall of lug vibrations spring, fixed connection between the other end of a plurality of vibrations springs and the outer wall of the case that induced drafts.

Preferably, two the feed inlet has all been seted up to broken grain treatment box's upside outer wall, and the inner wall fixedly connected with blanking pipe of feed inlet, the inner wall fixedly connected with control valve of blanking pipe, and the last port fixedly connected with conveying pipeline of blanking pipe, the same homoenergetic case of two conveying pipeline fixedly connected with.

Preferably, the inner wall fixedly connected with of homocline case divides the flitch, divides the flitch to be located the middle part of homocline case, divides the both sides of flitch all to be provided with the bull stick, and the outer wall fixedly connected with spiral pay-off leaf of bull stick, the tank wall fixedly connected with second of the homocline case of one end pass and lead the gear.

Preferably, the outer wall of the lower side of the material homogenizing box is fixedly connected with a second motor, the output end of the second motor is connected with a short shaft through a coupler, the other end of the short shaft is fixedly connected with a second driving gear, and the second driving gear is meshed with a second traction gear through a tooth groove.

Preferably, the downside outer wall fixedly connected with blanking box of transfer tube, the bottom inner wall swing joint of blanking box has the blanking plate, the downside outer wall fixedly connected with function base of blanking plate, the downside outer wall fixedly connected with vibrating motor of function base, and set up the round hole of two symmetries on the function base, the inner wall swing joint of round hole has the gag lever post, the both ends of gag lever post respectively with the both sides inner wall fixed connection of blanking box, the outside swing joint of gag lever post has the spacing spring of two symmetries, the both ends of spacing spring respectively with one side outer wall of function base and one side inner wall fixed connection of blanking box.

The beneficial effects of the invention are as follows:

1. according to the invention, by the arranged pretreatment equipment, before the mixing operation of the bifunctional compatibilizer, the modifying material and the polypropylene particles is carried out, the polypropylene particles are subjected to pre-crushing treatment, after the particles enter a particle crushing treatment box, the particles can be crushed by an internal particle crushing component, the blowing base is used for blowing the particles above the blowing base all the time in the process, and when the particles are crushed to be smaller, the weight of the particles is reduced, and the particles can be blown up by the blowing base and enter the particle suction pipe; the device is carrying out broken back to the polypropylene granule, utilizes wind-force to screen the polypropylene granule treatment article that satisfies the specification, and transport afterwards to mixing drum in and mix, the polypropylene granule specification of this kind of mode screening is littleer, carries out the hot melt in subsequent course of working more easily, improves holistic machining efficiency.

2. According to the invention, the particle breaking component is arranged, the first motor drives the two fixed shaft levers to rotate through the gear, so that the fixed particle breaking balls carry out particle breaking operation on polypropylene particles in the particle breaking treatment box, in the particle breaking process of the fixed particle breaking balls, the movable particle breaking balls are stressed along with extrusion of the polypropylene particles, and under the rapid rotation of the fixed shaft levers, the movable particle breaking balls are frequently stressed, the reset springs carry out irregular vibration, and the movable particle breaking balls collide with the fixed particle breaking balls, so that the particle breaking effect of the polypropylene particles is improved; utilize reset spring to drive the broken ball of activity and carry out irregular motion, increase the broken ball of activity and the collision effect of fixed broken ball, the outside of the broken ball of activity and fixed broken ball all sets up to coniform arch, then further increase the crushing effect to the polypropylene granule.

3. According to the invention, through the arrangement of the base plate, the air pump, the air pipe, the tap, the branch air pipe, the airflow valve, the flow equalizing blade, the grid, the bump and the vibrating spring, air is conveyed into the air box after the air pump works; the gas that drives polypropylene granule treatment product and rise can be discharged from the air current valve, and at the discharge process of air current valve, gas causes the impact to the air current valve, shakes the spring and takes place elastic deformation to the air current valve can carry out frequent vibrations, and the polypropylene granule treatment product that will adsorb on the graticule mesh in the vibrations process is bounced off, so that its quick whereabouts.

4. According to the invention, polypropylene particles are added into the homogenizing box through the blanking pipe, the control valve, the conveying pipe, the homogenizing box, the material distributing plate, the rotating rod, the spiral feeding blade, the second driving gear, the second motor and the second driving gear, the rotating rod is driven by the second motor to rotate, and the spiral feeding blade continuously conveys the polypropylene particles into the conveying pipe; the control valve can control the falling of the polypropylene particles, thereby facilitating uninterrupted crushing operation; the spiral feeding blade can control the falling speed of the polypropylene particles, and the conveying effect is prevented from being influenced by accumulation.

5. According to the invention, the polypropylene particle treatment product falls onto the blanking plate through the blanking box, the blanking plate, the functional base, the limiting rod, the limiting spring and the vibrating motor, the blanking plate is driven by the vibrating motor to vibrate, and the blanking plate performs transverse reciprocating motion under the reverse acting force of the limiting rod and the limiting spring, so that the effect of uniformly distributing the falling polypropylene particle treatment product is achieved.

Drawings

FIG. 1 is a schematic view of a partial cross-sectional structure of a method for preparing a paper-plastic non-glue composite film according to the present invention;

FIG. 2 is a schematic structural view of a blowing base of the method for preparing a paper-plastic non-glue composite film according to the present invention;

FIG. 3 is a schematic view of the internal structure of a particle breaking treatment box of the preparation method of the paper-plastic non-glue composite film provided by the invention;

FIG. 4 is a schematic structural diagram of a particle breaking assembly of a method for preparing a paper-plastic non-glue composite film according to the present invention;

FIG. 5 is a schematic view of a partial structure of a method for preparing a paper-plastic non-glue composite film according to the present invention;

FIG. 6 is a schematic structural view of an airflow valve of a method for preparing a paper-plastic non-glue composite film according to the present invention;

FIG. 7 is a schematic view of the overall structure of a method for preparing a paper-plastic non-glue composite film according to the present invention;

FIG. 8 is a schematic structural view of a material homogenizing box of a method for preparing a paper-plastic non-glue composite film according to the present invention;

FIG. 9 is a schematic view of the internal structure of a blanking box of the method for preparing a paper-plastic non-glue composite film according to the invention.

In the figure: 1. a particle breaking treatment box; 2. a blowing base; 3. an air box; 4. a blowing plate; 5. a particle suction pipe; 6. a grid plate; 7. an air suction box; 8. a transit tube; 9. fixing the shaft lever; 10. a half attached shaft lever; 11. fixing the particle breaking ball; 12. a first traction gear; 13. a first motor; 14. a first drive gear; 15. moving the particle breaking ball; 16. a return spring; 17. a base plate; 18. an air pump; 19. a gas delivery pipe; 20. a tap; 21. a bronchus; 22. an air flow valve; 23. flow equalizing leaves; 24. grid forming; 25. a bump; 26. vibrating the spring; 27. a blanking pipe; 28. a control valve; 29. a delivery pipe; 30. material homogenizing box; 31. a material distributing plate; 32. a rotating rod; 33. a spiral feeding blade; 34. a second traction gear; 35. a second motor; 36. a second driving gear; 37. a blanking box; 38. a blanking plate; 39. a functional base; 40. a limiting rod; 41. a limiting spring; 42. a vibration motor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

A preparation method of a paper-plastic non-glue composite film is shown in figures 1 and 2 and comprises the following steps:

wherein, the pretreatment equipment comprises two particle breaking treatment boxes 1, rectangular holes are respectively arranged at the bottoms of the two particle breaking treatment boxes 1, the inner walls of the rectangular holes are connected with a blowing base 2 through bolts, the blowing base 2 consists of an air box 3 and a blowing plate 4, the blowing plate 4 is positioned inside the particle breaking treatment boxes 1, particle breaking components are arranged inside the particle breaking treatment boxes 1, particle suction pipes 5 are arranged above the particle breaking components, the inner walls of the lower ports of the particle suction pipes 5 are connected with grid plates 6 through bolts, an air suction box 7 is connected between the two particle breaking treatment boxes 1 through bolts, two ends of the air suction box 7 are respectively connected with the particle suction pipes 5 at two sides through bolts, the outer wall at the lower side of the air suction box 7 is connected with a transit pipe 8 through bolts, after polypropylene particles are crushed, polypropylene particle processing products meeting the specification are screened by utilizing the wind power, and then the polypropylene particle processing products are conveyed to a mixing barrel for mixing, the polypropylene particles screened by the method have smaller specifications, are easier to melt in the subsequent processing process, and improve the overall processing efficiency.

Further, as shown in fig. 3 and 4, the granule breaking assembly comprises two fixed shaft levers 9 and a plurality of semi-attached shaft levers 10, the two fixed shaft levers 9 are located at different heights, the plurality of semi-attached shaft levers 10 are located at the outer sides of the two fixed shaft levers 9 and are distributed at equal intervals, two ends of the two fixed shaft levers 9 are respectively connected with the inner walls of two sides of the granule breaking treatment box 1 in a rotating manner, and the outer parts of one ends of the two fixed shaft levers 9 are respectively connected with a first driving gear 12 through bolts; a cylindrical hole groove is formed in the particle breaking treatment box 1, the inner wall of the cylindrical hole groove is connected with a first motor 13 through a bolt, the output end of the first motor 13 is connected with a short shaft through a coupler, the other end of the short shaft is connected with a first driving gear 14 through a bolt, and the first driving gear 14 is meshed with a first traction gear 12 through a tooth groove; the outside of fixed axostylus axostyle 9 has the fixed broken grain ball 11 of a plurality of equidistance through bolted connection, and be provided with the broken grain ball 15 of the activity of a plurality of equidistance on the semi-attached axostylus axostyle 10, all there is reset spring 16 through bolted connection between the broken grain ball 15 of a plurality of activities, pass through bolted connection between reset spring 16's the other end and the semi-attached axostylus axostyle 10, the outside of fixed broken grain ball 11 and the broken grain ball 15 of activity all is provided with a plurality of coniform archs, utilize reset spring 16 to drive the broken grain ball 15 of activity and carry out irregular motion, increase the collision effect of broken grain ball 15 of activity and fixed broken grain ball 11, the outside of broken grain ball 15 of activity and fixed broken grain ball 11 all sets up to coniform arch, then further increase the crushing effect to the polypropylene granule.

Furthermore, as shown in fig. 1, fig. 2, fig. 3 and fig. 6, a backing plate 17 is connected between the two granule breaking treatment boxes 1 through a bolt, an air pump 18 is connected to the outer wall of the upper side of the backing plate 17 through a bolt, an output end of the air pump 18 is connected with an air pipe 19 through a bolt, the other end of the air pipe 19 is connected with a tap-off device 20 through a bolt, two ports of the tap-off device 20 are respectively connected with a branch air pipe 21 through bolts, and the other end of the branch air pipe 21 is respectively connected with the two air boxes 3 through bolts; the rectangle hole groove has been seted up on case 7 induced drafts, there is airflow valve 22 the inner wall in rectangle hole groove through bolted connection, airflow valve 22's inside is provided with the leaf 23 that flow equalizes of a plurality of equidistances, there is the graticule mesh 24 port in case 7 induced drafts on airflow valve 22 through bolted connection, and airflow valve 22's upper and lower both sides outer wall all has lug 25 through bolted connection, there are a plurality of equidistance vibrations spring 26 one side outer wall of lug 25 through bolted connection, pass through bolted connection between a plurality of vibrations spring 26's the other end and the outer wall of case 7 induced drafts, reverse effort after utilizing vibrations spring 26 elastic deformation drives airflow valve 22 and shakes frequently, can open the polypropylene granule treatment article bullet that adsorbs on graticule mesh 24 in the vibrations process, so that its quick whereabouts.

Furthermore, as shown in fig. 1, 5, 7 and 8, the upper outer walls of the two crushing treatment boxes 1 are provided with feed inlets, the inner walls of the feed inlets are connected with a blanking pipe 27 through bolts, the inner wall of the blanking pipe 27 is connected with a control valve 28 through bolts, the upper end opening of the blanking pipe 27 is connected with feed delivery pipes 29 through bolts, the two feed delivery pipes 29 are connected with the same material homogenizing box 30 through bolts, and the control valve 28 can control the falling of polypropylene particles, so that uninterrupted crushing operation is facilitated; the inner wall of the equalizing box 30 is connected with a material distributing plate 31 through a bolt, the material distributing plate 31 is positioned in the middle of the equalizing box 30, rotating rods 32 are arranged on two sides of the material distributing plate 31, the outer wall of each rotating rod 32 is connected with a spiral feeding blade 33 through a bolt, one end of each rotating rod 32 penetrates through the box wall of the equalizing box 30 and is connected with a second driving gear 34 through a bolt, and the spiral feeding blade 33 can control the falling speed of polypropylene particles, so that the conveying effect is prevented from being influenced by accumulation; the outer wall of the lower side of the material equalizing box 30 is connected with a second motor 35 through a bolt, the output end of the second motor 35 is connected with a short shaft through a coupler, the other end of the short shaft is connected with a second driving gear 36 through a bolt, and the second driving gear 36 is meshed with the second traction gear 34 through tooth grooves.

Further, as shown in fig. 5, 7 and 9, the outer wall of the lower side of the transfer pipe 8 is connected with a blanking box 37 through a bolt, the inner wall of the bottom of the blanking box 37 is connected with a blanking plate 38 in a sliding manner, the outer wall of the lower side of the blanking plate 38 is connected with a functional base 39 through a bolt, the outer wall of the lower side of the functional base 39 is connected with a vibration motor 42 through a bolt, two symmetrical round holes are arranged on the functional base 39, the inner wall of each round hole is connected with a limiting rod 40 in a sliding manner, two ends of the limiting rod 40 are respectively connected with the inner walls of two sides of the blanking box 37 through bolts, two symmetrical limiting springs 41 are sleeved outside the limiting rod 40, two ends of each limiting spring 41 are respectively connected with the outer wall of one side of the functional base 39 and the inner wall of one side of the blanking box 37 through bolts, the vibration motor 42 drives the blanking plate 38 to vibrate, under the reverse acting force of the limiting rod 40 and the limiting springs 41, the blanking plate 38 performs a transverse reciprocating motion, thereby playing the role of evenly dividing the falling polypropylene particle treatment product.

The working principle is as follows: before the mixing operation of the bifunctional compatibilizer, the modifier and the polypropylene particles is performed, the polypropylene particles are added into a homogenizing box 30, the second motor 35 drives the rotating rod 32 to rotate, the screw feeding blade 33 continuously feeds the polypropylene particles into the material conveying pipe 29, then the control valve 28 is opened, the polypropylene particles fall into the particle breaking treatment box 1 from the blanking pipe 27, the first motor 13 is electrified to work and then drives the two fixed shaft levers 9 to rotate through the gears, thereby fixing the particle breaking ball 11 to carry out particle breaking operation on the polypropylene particles in the particle breaking treatment box 1, in the process of breaking the fixed breaking ball 11, the movable breaking ball 15 is stressed along with the extrusion of the polypropylene particles, under the rapid rotation of the fixed shaft lever 9, the movable broken grain balls 15 are frequently stressed, the reset springs 16 perform irregular vibration, the movable broken grain balls 15 collide with the fixed broken grain balls 11, and the broken grain effect of polypropylene particles is improved;

in the process, the air pump 18 delivers air into the bellows 3 after working, the blowing base 2 blows the particles above all the time in the process, when the particles are broken and are small, the weight of the particles is reduced, the particles can be blown up by the blowing base 2 and enter the particle suction pipe 5, the air which drives the polypropylene particle processed product to rise can be discharged from the air flow valve 22, in the discharging process of the air flow valve 22, the air impacts the air flow valve 22, the vibration spring 26 generates elastic deformation, so that the air flow valve 22 can vibrate frequently, the polypropylene particle processed product adsorbed on the grid net 24 can be bounced off in the vibration process, the polypropylene particle processed product falls rapidly, the polypropylene particle processed product falls directly on the blanking plate 38 after falling, the vibration motor 42 drives the blanking plate 38 to vibrate, under the reverse acting force of the limiting rod 40 and the limiting spring 41, the blanking plate 38 performs transverse reciprocating motion, thereby playing the role of evenly dividing the falling polypropylene particle treatment product.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A preparation method of a paper-plastic glue-free composite film is characterized by comprising the following steps:

wherein, preprocessing equipment includes that two broken grain handle case (1), its characterized in that, two the rectangular hole has all been seted up to the bottom of broken grain handle case (1), and the inner wall fixedly connected with of rectangular hole base (2) of blowing, and base (2) of blowing comprise bellows (3) and air-blowing board (4), and air-blowing board (4) are located the inside of broken grain handle case (1), the inside of broken grain handle case (1) is provided with broken grain subassembly, and the top of broken grain subassembly is provided with inhales grain pipe (5), inhales the lower extreme oral cavity inner wall fixedly connected with grid tray (6) of grain pipe (5), two fixedly connected with inlet box (7) between broken grain handle case (1), the both ends of inlet box (7) respectively with the both sides inhale between grain pipe (5) fixed connection, and the downside outer wall fixedly connected with transfer pipe (8) of inlet box (7).

2. The preparation method of the paper-plastic glue-free composite film according to claim 1, wherein the grain breaking assembly comprises two fixed shaft rods (9) and a plurality of half attached shaft rods (10), the two fixed shaft rods (9) are located at different heights, the plurality of half attached shaft rods (10) are located at the outer sides of the two fixed shaft rods (9) and are distributed at equal intervals, two ends of the two fixed shaft rods (9) are movably connected with the inner walls of two sides of the grain breaking treatment box (1) respectively, and the outer parts of one ends of the two fixed shaft rods (9) are fixedly connected with first driving gears (12).

3. The preparation method of the paper-plastic glue-free composite film according to claim 2, wherein a cylindrical hole groove is formed in the particle breaking treatment box (1), a first motor (13) is fixedly connected to the inner wall of the cylindrical hole groove, the output end of the first motor (13) is connected with a short shaft through a coupling, a first driving gear (14) is fixedly connected to the other end of the short shaft, and the first driving gear (14) is meshed with the first driving gear (12) through a tooth groove.

4. The preparation method of the paper-plastic glue-free composite film according to claim 2, wherein a plurality of equidistant fixed broken grain balls (11) are fixedly connected to the outside of the fixed shaft rod (9), a plurality of equidistant movable broken grain balls (15) are arranged on the semi-attached shaft rod (10), a return spring (16) is fixedly connected between each plurality of movable broken grain balls (15), the other end of the return spring (16) is fixedly connected with the semi-attached shaft rod (10), and a plurality of conical bulges are arranged on the outside of each fixed broken grain ball (11) and each movable broken grain ball (15).

5. The preparation method of the paper-plastic glue-free composite film according to claim 1, wherein a base plate (17) is fixedly connected between the two granulation processing boxes (1), an air pump (18) is fixedly connected to the outer wall of the upper side of the base plate (17), an air pipe (19) is fixedly connected to the output end of the air pump (18), a tap (20) is fixedly connected to the other end of the air pipe (19), two branch pipes (21) are respectively and fixedly connected to two ports of the tap (20), and the other end of each branch pipe (21) is respectively and fixedly connected to two air boxes (3).

6. The preparation method of the paper-plastic non-glue composite film according to claim 5, wherein a rectangular hole groove is formed in the air suction box (7), an air flow valve (22) is fixedly connected to the inner wall of the rectangular hole groove, a plurality of equidistant flow equalizing blades (23) are arranged inside the air flow valve (22), a grid (24) is fixedly connected to a port of the air flow valve (22) located in the air suction box (7), a bump (25) is fixedly connected to the outer walls of the upper side and the lower side of the air flow valve (22), a plurality of equidistant vibration springs (26) are fixedly connected to the outer wall of one side of the bump (25), and the other ends of the vibration springs (26) are fixedly connected to the outer wall of the air suction box (7).

7. The method for preparing the paper-plastic non-glue composite film according to claim 1, wherein the upper outer walls of the two crumb processing boxes (1) are provided with feed inlets, the inner walls of the feed inlets are fixedly connected with blanking pipes (27), the inner walls of the blanking pipes (27) are fixedly connected with control valves (28), the upper ports of the blanking pipes (27) are fixedly connected with material conveying pipes (29), and the two material conveying pipes (29) are fixedly connected with the same homogenizing box (30).

8. The preparation method of the paper-plastic glue-free composite film according to claim 7, wherein a material distributing plate (31) is fixedly connected to the inner wall of the material homogenizing box (30), the material distributing plate (31) is located in the middle of the material homogenizing box (30), rotating rods (32) are arranged on two sides of the material distributing plate (31), spiral feeding blades (33) are fixedly connected to the outer wall of each rotating rod (32), and a second driving gear (34) is fixedly connected to one end of each rotating rod (32) penetrating through the wall of the material homogenizing box (30).

9. The preparation method of the paper-plastic glue-free composite film according to claim 8, wherein a second motor (35) is fixedly connected to the outer wall of the lower side of the material homogenizing box (30), an output end of the second motor (35) is connected with a short shaft through a coupler, the other end of the short shaft is fixedly connected with a second driving gear (36), and the second driving gear (36) is meshed with a second driving gear (34) through tooth grooves.

10. The method for preparing paper-plastic non-glue composite film according to claim 1, a blanking box (37) is fixedly connected with the outer wall of the lower side of the transit pipe (8), a blanking plate (38) is movably connected with the inner wall of the bottom of the blanking box (37), a functional base (39) is fixedly connected with the outer wall of the lower side of the blanking plate (38), a vibration motor (42) is fixedly connected with the outer wall of the lower side of the functional base (39), and two symmetrical round holes are formed in the functional base (39), the inner wall of each round hole is movably connected with a limiting rod (40), two ends of each limiting rod (40) are fixedly connected with the inner walls of the two sides of the blanking box (37) respectively, the outer part of each limiting rod (40) is movably connected with two symmetrical limiting springs (41), and two ends of each limiting spring (41) are fixedly connected with the outer wall of one side of the functional base (39) and the inner wall of one side of the blanking box (37) respectively.