CN110435171B

CN110435171B - PVC packaging film and production process thereof

Info

Publication number: CN110435171B
Application number: CN201910748908.3A
Authority: CN
Inventors: 黄财富
Original assignee: Tianjin Changsheng Decoration Printing Co ltd
Current assignee: Tianjin Changsheng Decoration Printing Co ltd
Priority date: 2019-08-14
Filing date: 2019-08-14
Publication date: 2020-10-13
Anticipated expiration: 2039-08-14
Also published as: CN110435171A

Abstract

The invention discloses a PVC packaging film and a production process thereof, wherein the PVC packaging film is prepared from the following raw materials in parts by weight: 0.03-0.04 part of plasticizer, 7-9 parts of stabilizer, 0.1-0.2 part of nano magnet powder, 0.15-0.22 part of nano activated carbon, 3-5 parts of titanium dioxide, 3.5-6 parts of flame retardant and 90-100 parts of PVC resin. S4: and (4) mounting the three groups of rotating shafts of the packaging films obtained in the step (S3) at one end of the compounding device, coating transparent water-based glue on the upper surface and the lower surface of the packaging film in the middle layer by using a glue coating structure in the compounding device, and bonding the other two layers of packaging films on the upper surface and the lower surface of the packaging film in the middle layer by using the transparent water-based glue. The transparency of the packaging film is not influenced by a small amount of the inside of the packaging film, the packaging film can absorb illumination, the black illumination absorption capacity is strong, the temperature rise is fast, and the softness of the packaging film is improved. Can absorb the smell of the packaging film, and simultaneously, the packaging film can absorb the external smell in use. And the magnet powder has the magnetic adsorption function, and the packaging film can be tightly bonded with the iron metal.

Description

PVC packaging film and production process thereof

Technical Field

The invention relates to the field of PVC packaging film processing, in particular to a PVC packaging film and a production process thereof.

Background

The PVC packaging film as a widely used packaging film has the advantages of more stable and tidy packaging material and super-strong waterproof function. The product has the characteristics of high tensile strength, high elongation, good self-adhesion, high transparency and the like. Meanwhile, the PVC packaging film has some defects in use: some PVC packaging films are soft when used in summer, become hard once in winter, cannot absorb heat quickly, are hard in texture, are inconvenient to use, and have certain adverse effects on packaging. Meanwhile, the PVC packaging film is easy to adsorb dust and become opaque when in use, and external impurities are difficult to remove, so that the normal use is influenced. And the prior packaging film emits some odor when in use, thereby polluting the air. Is unstable in the process of packaging with iron metal and is easy to fall off.

Disclosure of Invention

The invention aims to provide a PVC packaging film and a production process thereof, which solve the problems that the traditional PVC packaging film is very soft when used in summer, becomes hard in winter, cannot quickly absorb heat, is hard in texture, is inconvenient to use and has certain adverse effect on packaging. Meanwhile, the PVC packaging film is easy to adsorb dust and become opaque when in use, and external impurities are difficult to remove, so that the normal use is influenced. And emits some odor when in use, polluting the air. The packaging process of the packaging bag is unstable and easy to fall off when being used for packaging iron metal.

The purpose of the invention can be realized by the following technical scheme:

the PVC packaging film is prepared from the following raw materials in parts by weight: 0.03-0.04 part of plasticizer, 7-9 parts of stabilizer, 0.1-0.2 part of nano magnet powder, 0.15-0.22 part of nano activated carbon, 3-5 parts of titanium dioxide, 3.5-6 parts of flame retardant and 90-100 parts of PVC resin.

The nano magnet powder is prepared by the following steps:

the method comprises the following steps: putting a magnet to be used into a grinder for grinding, and then putting the obtained magnet powder into a precision grinder for grinding;

step two: putting the magnet powder obtained by grinding in the step one into a screen with the aperture of 50-100nm for sieving, putting the rest magnet powder obtained by screening into the precision grinding machine again for grinding, and repeating for many times until the magnet powder reaches the nanometer level;

the PVC packaging film is prepared by the following steps:

s1: putting the plasticizer, the stabilizer, the titanium dioxide and the PVC resin into a stirring device for stirring, grinding the magnet powder and the active carbon, grinding the active carbon and the magnet powder to a nano level, and then putting the nano level active carbon and the magnet powder into the stirring device for stirring and mixing with other materials;

s2, placing the material mixture obtained in the step S1 into an internal mixer for internal mixing, and forming a raw material of the PVC packaging film after the material mixture is internally mixed and plasticized;

s3, putting the raw material prepared in the S2 into a die-casting machine for die-casting to form one third of the thickness of the required packaging film, and winding the packaging film outside the rotating shaft;

s4: and (4) mounting the three groups of rotating shafts of the packaging films obtained in the step (S3) at one end of the compounding device, coating transparent water-based glue on the upper surface and the lower surface of the packaging film in the middle layer by using a glue coating structure in the compounding device, and bonding the other two layers of packaging films on the upper surface and the lower surface of the packaging film in the middle layer by using the transparent water-based glue.

A production process of a PVC packaging film comprises the following steps:

The compounding step in the step S4 is:

the method comprises the following steps: the first rotating shaft, the second rotating shaft and the third rotating shaft which are wound with the packaging films are fixed in the mounting frame through rotating rods at two ends, the second rotating shaft is installed between the first rotating shaft and the third rotating shaft, and the packaging films outside the first rotating shaft, the second rotating shaft and the third rotating shaft penetrate through the inner portion of the gluing structure at the end portion.

Step two: screwing the bolt rods on two sides of the upper part of the cover plate to rotate, enabling the bolt rods to move up and down at the top of the cover plate, enabling the bottoms of the bolt rods to rotate on the upper parts of the glue dripping pipe, the uniform smearing pipe and the cleaning pipe through bearings, further driving the glue dripping pipe, the uniform smearing pipe and the cleaning pipe on the upper part to move up and down in the moving groove until the upper glue dripping pipe, the uniform smearing pipe and the cleaning pipe extrude the packaging film to the middle part, connecting the glue dripping pipe at the end part of the second rotating shaft with a glue conveying machine, coating glue on the upper side and the lower side of the packaging film of the middle layer by the upper glue dripping pipe and the lower glue; the three layers of packaging films are bonded and wound outside the winding rod.

Preferably, the glue inside the glue dripping pipe in the second step drops on the upper side and the lower side of the middle-layer packaging film through the glue outlet, the smearing pads on the side surfaces of the two smearing pipes are in close contact with the outside of the packaging film after the middle-layer packaging film passes through the two smearing pipes, and the smearing pads evenly coat the glue outside the upper side and the lower side of the middle-layer packaging film; the packaging film penetrates between the two cleaning pipes, the scraping openings on the side faces of the cleaning pipes are in contact with the upper side and the lower side of the packaging film, redundant glue outside the packaging film is scraped and removed by the scraping openings, the scraped glue enters the cleaning pipes from the scraping openings, the glue stored in the cleaning pipes is discharged outwards from the glue discharging hoses at the two ends, when the upper packaging film layer and the lower packaging film layer penetrate through the gluing structure, the end parts of the upper packaging film layer and the lower packaging film layer are limited by the pressing shaft and are extruded to be flat, then the two glue dripping pipes, the two uniform smearing pipes and the two cleaning pipes extrude the outside of the packaging film layer, the packaging film layer is extruded to be flat, meanwhile, dust on the outside is removed, the three packaging film layers are limited by the gluing structure, and the three packaging film layers.

Preferably, after the packaging film passes through the inside of the gluing structure in the second step, the adjusting bolt at the bottom of the base plate can be screwed according to actual needs to push the bottom plate to rotate, so that the direction of the bottom plate can be adjusted, and the packaging film is ensured not to be wound after passing through the inside of the gluing structure.

Preferably, in the second step, after the three layers of packaging films are bonded, the three layers of packaging films penetrate between the two compression rollers and are wound with the winding rod, the screw rod is screwed to push the two compression rollers to move on the side face of the truss through the sliding groove until the two compression rollers extrude the packaging films in the middle, and the packaging films are extruded between the two compression rollers; meanwhile, in the compounding process, the screw rod can be screwed to push the mounting rack to move on the side face of the fixing rack through the sliding groove, and the distance between the mounting rack and the frame is adjusted.

The composite set includes frame and underframe, and the frame mounting has the curb plate in the upper portion one end of underframe, and all welds in the top both sides of frame, has the winding pole through dwang horizontal installation between two curb plate middle parts, and the motor is installed to one side of curb plate, and the motor passes through the dwang of belt connection one end, and the mounting bracket is installed at the top of underframe, and the inside of mounting bracket is from last to having first pivot, second pivot and third pivot through the dwang of both sides horizontal installation in proper order down. Three groups of gluing structures are uniformly arranged on one side of the inner part of the mounting frame from top to bottom through the fixing rods. The bottom of curb plate has the truss near one side horizontal welding of mounting bracket, and the equal horizontal welding in one side both ends that the middle part of frame is close to the mounting bracket has the mount, and the inside middle-end of mount and truss all is provided with the sliding tray along length direction, and the compression roller is installed through sliding tray and screw rod to the truss, and the side of mounting bracket is connected through sliding tray and screw rod to the mount, and the inside both sides of underframe all are provided with the sliding tray, and the bottom both sides of mounting bracket pass through the sliding tray joint underframe.

The rubber coating structure includes backing plate and bottom plate, and the dead lever is connected to the one end of backing plate, and the bottom plate is connected with the backing plate through the adjusting bolt of bottom, bottom plate and backing plate parallel arrangement. The upper portion one end of bottom plate has the last item through the support mounting, and the apron is installed to the other end, and the apron is inside to be the cavity setting. And both ends all have glue dripping pipe, smear even pipe and clear away the pipe about the inside of apron in proper order horizontally arranged, and the inside both sides of apron all are provided with three vertical shifting chutes of group, and the glue dripping pipe on upper portion, smear even pipe and clear away the inside of managing both ends and all install in the shifting chute, and the glue dripping pipe on upper portion, smear even pipe and clear away the inside of managing both ends all through the shank of bolt that the bearing is connected with vertical setting, the top of shank of bolt runs through the apron to be threaded connection with the apron. The outside of rubber dropping pipe evenly is provided with a plurality of and goes out the jiao kou, and two are wiped evenly the pipe and all are connected with to opposite one side and paint the pad, and two are clear away the pipe and are all provided with the mouth of scraping mutually opposite one side, and the both ends of just clearing away the pipe all are connected with the rubber hose that arranges, and the rubber hose that arranges runs through the side of apron.

The invention has the beneficial effects that:

1. compared with the existing packaging film, the nanometer-level magnet powder and the nanometer-level active carbon are added into the raw materials for preparing the packaging film, the diameter of the nanometer-level substance is smaller, the normal preparation of the packaging film is not affected, and the magnet powder and the active carbon are arranged in the prepared packaging film. The magnet powder and the active carbon can increase the toughness of the packaging film, so that the packaging film is not easy to break and the safety performance is improved. Meanwhile, the magnet powder and the active carbon are black, the transparency of the packaging film is not influenced by the small amount of the magnet powder and the active carbon in the packaging film, the illumination can be absorbed, the black light absorption capacity is high, and the temperature rise is fast. In cold winter, the temperature of the packaging film is improved compared with other packaging films after the packaging film is irradiated by light, and the softness of the packaging film is improved. Meanwhile, the active carbon has an adsorption function and can absorb the smell of the packaging film, and the packaging film can absorb the external smell in use, so that the active carbon has the function of purifying air and reduces the pollution in use. And the magnet powder has the magnetic force adsorption function, and when the packaging film is used for packaging the iron metal, the packaging film can be tightly bonded with the iron metal, so that the packaging film is not easy to fall off in packaging, the stability is better, and the packaging is convenient and quick. And the back is abandoned to the wrapping film of waste gas, can be quick pick up the wrapping film through the article of iron, and the packing is picked up simply, and loads discarded wrapping film with the article of iron, and the wrapping film receives wind-force can not blown away.

2. A composite procedure is added in the production process of the packaging film, and the three layers of packaging films are jointed to form the complete packaging film, so that the packaging film has a three-layer separable structure in use. After impurities fall into the outer portion of the packaging film and are difficult to clean, the outer packaging film layer can be removed, the impurities are removed, the transparency of the packaging film is still good, and the packaging film can be normally used. And the impurities are easy to clean, and the service life of the packaging film can be prolonged.

3. And a composite device is used in the composite process, and the gluing structure in the device can bond and compound the three layers of packaging films. Three groups of rotating shafts are arranged on the upper part of the bottom frame, so that three layers of packaging films to be compounded can be isolated, the upper and lower layers of packaging films can uniformly and accurately cover the outer part of the middle layer of packaging film, and the phenomenon of compounding dislocation is not easy to occur in compounding. Meanwhile, the cleaning pipe, the glue dripping pipe and the uniform smearing pipe in the gluing structure can be in close extrusion contact with the packaging die from the upper side and the lower side, glue can be coated on the outer portion of the middle-layer packaging film, the glue on the outer portion can be evenly smeared, redundant glue is removed, and the good flatness and the uniform adhesion after adhesion are guaranteed. And the bolt rods at the two ends of the cover plate can adjust the heights of the upper cleaning pipe, the rubber dripping pipe and the uniform smearing pipe, so that the cover plate is suitable for packaging films with different thicknesses and has strong adaptability.

4. The rubber coating structure can be adjusted freely through the adjusting bolt at the bottom, and meets the requirements of different works. Meanwhile, the packaging film can be extruded by the two compression rollers, internal bubbles can be removed, the composite force between the three layers of packaging films is increased, the packaging films are smoother, and the bonding strength is improved. The mounting bracket and the compression roller can be adjusted in position as required, can meet various working requirements, and are convenient to operate.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of the composite device of the present invention.

Fig. 2 is a schematic isometric view of fig. 1 according to the present invention.

Fig. 3 is a side view of the glue spreading structure of the present invention.

Fig. 4 is a top view of the glue structure of the invention.

FIG. 5 is a schematic view of the installation structure of the drip hose of the present invention.

FIG. 6 is a schematic view of a trowel tube structure according to the present invention.

FIG. 7 is a schematic view of a scavenging structure of the present invention.

FIG. 8 is an enlarged view of detail A in FIG. 2 according to the present invention.

In the figure: 1. a frame; 2. a side plate; 3. a winding rod; 4. a truss; 5. a compression roller; 6. a first rotating shaft; 7. a second rotating shaft; 8. a third rotating shaft; 9. a mounting frame; 10. a bottom frame; 11. rotating the rod; 12. fixing the rod; 13. pressing the shaft; 14. a glue discharging hose; 15. a cover plate; 16. a base plate; 17. adjusting the bolt; 18. a fixed mount; 19. a base plate; 20. clearing the pipe; 21. evenly smearing the pipe; 22. a rubber dripping pipe; 23. a bolt shank; 24. a glue outlet; 25. a moving groove; 26. smearing the pad; 27. scraping the opening; 28. a sliding groove.

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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-8, a PVC packaging film is prepared from the following raw materials in parts by weight: 0.03-0.04 part of plasticizer, 7-9 parts of stabilizer, 0.1-0.2 part of nano magnet powder, 0.15-0.22 part of nano activated carbon, 3-5 parts of titanium dioxide, 3.5-6 parts of flame retardant and 90-100 parts of PVC resin;

the nano magnet powder is prepared by the following steps:

the PVC packaging film is prepared by the following steps:

A production process of a PVC packaging film comprises the following steps:

s4: mounting the three groups of packaging film rotating shafts obtained in the S3 at one end of a composite device, coating transparent water-based glue on the upper and lower surfaces of the middle layer packaging film by a glue coating structure in the composite device, and bonding the other two layers of packaging films on the upper and lower surfaces of the middle layer packaging film by the transparent water-based glue;

the compounding step in the step S4 is:

the method comprises the following steps: fixing a first rotating shaft 6, a second rotating shaft 7 and a third rotating shaft 8 wound with packaging films inside a mounting frame 9 through rotating rods 11 at two ends, installing the second rotating shaft 7 between the first rotating shaft 6 and the third rotating shaft 8, and enabling the packaging films outside the first rotating shaft 6, the second rotating shaft 7 and the third rotating shaft 8 to penetrate through the gluing structures at the ends;

step two: screwing the bolt rods 23 on the two sides of the upper part of the cover plate 15 to rotate, enabling the bolt rods 23 to move up and down at the top of the cover plate 15, enabling the bottoms of the bolt rods 23 to rotate on the upper parts of the glue dripping pipes 22, the leveling pipes 21 and the cleaning pipes 20 through bearings, further driving the glue dripping pipes 22, the leveling pipes 21 and the cleaning pipes 20 on the upper parts to move up and down in the moving groove 25 until the upper glue dripping pipes 22, the leveling pipes 21 and the cleaning pipes 20 extrude the packaging films to the middle parts, mechanically connecting the glue dripping pipes 22 at the end parts of the second rotating shaft 7 with glue conveying machines, coating glue on the upper side and the lower side of the middle-layer packaging film by the upper glue dripping pipes 22 and the lower glue dripping pipes; the three layers of packaging films are bonded and wound outside the winding rod 3.

As a technical optimization scheme of the invention, in the second step, the glue inside the glue dripping pipe 22 is dripped on the upper side and the lower side of the middle layer packaging film through the glue outlet 24, after the middle layer packaging film passes through the two smearing pipes 21, the smearing pads 26 on the side surfaces of the two smearing pipes 21 are in close contact with the outside of the packaging film, and the smearing pads 26 coat the glue on the outside of the upper side and the lower side of the middle layer packaging film uniformly; then the packaging film passes through the two cleaning pipes 20, the scraping openings 27 on the side surfaces of the cleaning pipes 20 are in contact with the upper side and the lower side of the packaging film, the scraping openings 27 scrape and remove redundant glue outside the packaging film, the scraped glue enters the cleaning pipes 20 from the scraping openings 27, the glue stored in the cleaning pipes 20 is discharged outwards from the glue discharging hoses 14 at the two ends, when the upper and the lower packaging films pass through the gluing structure, the end parts of the upper and the lower packaging films are limited by the pressing shaft 13 and are extruded and flattened, then the two glue dripping pipes 22, the two uniform coating pipes 21 and the two cleaning pipes 20 extrude the outside of the packaging film, the packaging film is extruded and flattened, meanwhile, dust on the outside is removed, the three layers of packaging films are limited by the gluing structure, and the three layers of packaging films are bonded neatly.

As a technical optimization scheme of the invention, after the packaging film passes through the inside of the gluing structure in the second step, the adjusting bolt 17 at the bottom of the backing plate 19 can be screwed according to actual requirements to push the bottom plate 16 to rotate, so that the direction of the bottom plate can be adjusted, and the packaging film is ensured not to be wound after passing through the inside of the gluing structure.

As a technical optimization scheme of the invention, in the second step, after three layers of packaging films are bonded, the three layers of packaging films pass through between two compression rollers 5 and then are wound with a winding rod 3, a screw is screwed to push the two compression rollers 5 to move on the side surface of the truss 4 through a sliding groove 28 until the two compression rollers 5 extrude the packaging films in the middle, and the packaging films are extruded between the two compression rollers 5; meanwhile, in the compounding process, the screw rod can be screwed to push the mounting rack 9 to move on the side surface of the fixed rack 18 through the sliding groove 28, and the distance between the mounting rack 9 and the frame 1 is adjusted.

Composite set includes frame 1 and underframe 10, frame 1 installs the upper portion one end at underframe 10, and all welded curb plate 2 in frame 1's top both sides, there is winding pole 3 through 11 horizontal installations of dwang between 2 middle parts of two curb plates, the motor is installed to one side of curb plate 2, the motor passes through the dwang 11 of belt connection one end, mounting bracket 9 is installed at the top of underframe 10, mounting bracket 9's inside from last to down through dwang 11 horizontal installations in proper order of both sides have first pivot 6, second pivot 7 and third pivot 8. Three groups of gluing structures are uniformly arranged on one side of the interior of the mounting frame 9 from top to bottom through the fixing rod 12. The bottom of curb plate 2 has truss 4 near one side horizontal welding of mounting bracket 9, the equal horizontal welding in one side both ends that the middle part of frame 1 is close to mounting bracket 9 has mount 18, and the inside middle-end of mount 18 and truss 4 all is provided with sliding tray 28 along length direction, compression roller 5 is installed through sliding tray 28 and screw rod to truss 4, mount 18 passes through sliding tray 28 and the side of screw rod connection mounting bracket 9, and the inside both sides of underframe 10 all are provided with sliding tray 28, sliding tray 28 joint underframe 10 is passed through to the bottom both sides of mounting bracket 9.

The gluing structure comprises a backing plate 19 and a bottom plate 16, one end of the backing plate 19 is connected with the fixing rod 12, the bottom plate 16 is connected with the backing plate 19 through an adjusting bolt 17 at the bottom, and the bottom plate 16 and the backing plate 19 are arranged in parallel. One end of the upper part of the bottom plate 16 is provided with a pressing shaft 13 through a bracket, the other end is provided with a cover plate 15, and the cover plate 15 is arranged in a hollow way. And both ends all have glue dripping pipe 22 about the inside of apron 15 in proper order horizontal installation, smear even pipe 21 and clear away pipe 20, and the inside both sides of apron 15 all are provided with three vertical moving grooves 25 of group, glue dripping pipe 22 on upper portion, smear even pipe 21 and clear away the inside at moving groove 25 at pipe 20 both ends, and glue dripping pipe 22 on upper portion, smear even pipe 21 and clear away the inside at pipe 20 both ends top and all be connected with the shank of bolt 23 of vertical setting through the bearing, the top of shank of bolt 23 runs through apron 15, and be threaded connection with apron 15. The outside of rubber dripping pipe 22 evenly is provided with a plurality of and goes out jiao kou 24, and two even pipes 21 of smearing all are connected with to opposite one side and smear pad 26, and two are clear away the pipe 20 relative one side and all are provided with scrapes mouthful 27, and the both ends of clearing away pipe 20 all are connected with the binder removal hose 14, and the binder removal hose 14 runs through the side of apron 15.

The invention has the beneficial effects that:

3. And a composite device is used in the composite process, and the gluing structure in the device can bond and compound the three layers of packaging films. Three groups of rotating shafts are arranged on the upper part of the bottom frame 10, so that three layers of packaging films to be compounded can be isolated, the upper and lower layers of packaging films can uniformly and accurately cover the outer part of the middle layer of packaging film, and the phenomenon of compounding dislocation is not easy to occur in compounding. Meanwhile, the cleaning pipe 20, the glue dripping pipe 22 and the uniform smearing pipe 21 in the gluing structure can be in close extrusion contact with the packaging die from the upper side and the lower side, glue can be coated on the outer portion of the middle-layer packaging film, the outer glue can be smeared uniformly, redundant glue is removed, and the good flatness and uniform bonding after bonding are guaranteed. And the bolt rods 23 at the two ends of the cover plate 15 can adjust the heights of the upper cleaning pipe 20, the glue dripping pipe 22 and the uniform smearing pipe 21, so that the cover plate is suitable for packaging films with different thicknesses and has strong adaptability.

4. The rubber coating structure can be adjusted freely through the adjusting bolt at the bottom, and meets the requirements of different works. Meanwhile, the packaging film which can be compounded can be extruded by the two compression rollers 5, internal bubbles can be removed, the compounding force between the three layers of packaging films is increased, the packaging film is smoother, and the bonding strength is improved. The mounting frame 9 and the compression roller 5 can be adjusted in position as required, can meet various working requirements, and are convenient to operate.

The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.

Claims

1. A PVC packaging film is characterized in that: the PVC packaging film is prepared from the following raw materials in parts by weight: 0.03-0.04 part of plasticizer, 7-9 parts of stabilizer, 0.1-0.2 part of nano magnet powder, 0.15-0.22 part of nano activated carbon, 3-5 parts of titanium dioxide, 3.5-6 parts of flame retardant and 90-100 parts of PVC resin;

the nano magnet powder is prepared by the following steps:

the PVC packaging film is prepared by the following steps:

s2: the material mixture obtained in the step S1 is placed into an internal mixer for internal mixing, and the material mixture forms the raw material of the PVC packaging film after internal mixing and plasticizing;

s3: putting the raw material prepared in the step S2 into a die-casting machine for die-casting to form one third of the thickness of the required packaging film, and winding the packaging film outside the rotating shaft;

2. The production process of the PVC packaging film is characterized by comprising the following steps:

the compounding step in the step S4 is:

the method comprises the following steps: fixing a first rotating shaft (6), a second rotating shaft (7) and a third rotating shaft (8) wound with packaging films inside a mounting frame (9) through rotating rods (11) at two ends, installing the second rotating shaft (7) between the first rotating shaft (6) and the third rotating shaft (8), and enabling the packaging films outside the first rotating shaft (6), the second rotating shaft (7) and the third rotating shaft (8) to penetrate through the inside of a gluing structure at the end part;

step two: screwing bolt rods (23) on two sides of the upper part of the cover plate (15) to rotate, enabling the bolt rods (23) to move up and down at the top of the cover plate (15), enabling the bottoms of the bolt rods to rotate on the upper parts of the glue dripping pipe (22), the uniform smearing pipe (21) and the cleaning pipe (20) through bearings, further driving the glue dripping pipe (22), the uniform smearing pipe (21) and the cleaning pipe (20) on the upper part to move up and down in a moving groove (25) until the upper and lower glue dripping pipes (22), the uniform smearing pipe (21) and the cleaning pipe (20) extrude the packaging film to the middle part, mechanically connecting the glue dripping pipes (22) at the end part of the second rotating shaft (7) with a glue conveying machine, coating glue on the upper and lower sides of the packaging film of the middle layer, and adhering the upper and lower packaging films to the outer parts of the; the three layers of packaging films are bonded and wound outside the winding rod (3).

3. The production process of the PVC packaging film according to claim 2, characterized in that: in the second step, glue inside the glue dripping pipe (22) drips on the upper side and the lower side of the middle layer packaging film through the glue outlet (24), after the middle layer packaging film passes through the two smearing pipes (21), smearing pads (26) on the side surfaces of the two smearing pipes (21) are in close contact with the outside of the packaging film, and the smearing pads (26) evenly coat the glue on the outside of the upper side and the lower side of the middle layer packaging film; the packaging film penetrates between the two cleaning pipes (20), scraping openings (27) in the side faces of the cleaning pipes (20) are in contact with the upper side and the lower side of the packaging film, excessive glue outside the packaging film is scraped and removed through the scraping openings (27), the scraped glue enters the cleaning pipes (20) from the scraping openings (27), the glue stored in the cleaning pipes (20) is discharged outwards from glue discharge hoses (14) at the two ends, when the upper packaging film and the lower packaging film penetrate through the gluing structure, the end parts of the upper packaging film and the lower packaging film are limited by a pressing shaft (13) and are extruded and flattened, then the two glue dripping pipes (22), the two uniform pipes (21) and the two cleaning pipes (20) extrude the outside of the packaging film, the packaging film is extruded and flattened, meanwhile, dust on the outside is removed, the three packaging films are limited by the gluing structure, and the three packaging films are bonded neatly.

4. The production process of the PVC packaging film according to claim 2, characterized in that: and in the second step, after the packaging film passes through the inside of the gluing structure, the adjusting bolt (17) at the bottom of the backing plate (19) can be screwed according to actual requirements, so that the bottom plate (16) is pushed to rotate, the direction of the bottom plate can be adjusted, and the packaging film is ensured not to be wound after passing through the inside of the gluing structure.

5. The production process of the PVC packaging film according to claim 2, characterized in that: in the second step, after the three layers of packaging films are bonded, the three layers of packaging films penetrate between the two compression rollers (5) and then are wound with the winding rod (3), the screw rod is screwed to push the two compression rollers (5) to move on the side face of the truss (4) through the sliding groove (28) until the two compression rollers (5) extrude the packaging films in the middle, and the packaging films are extruded between the two compression rollers (5); meanwhile, in the compounding process, the screw rod can be screwed to push the mounting rack (9) to move on the side face of the fixing rack (18) through the sliding groove (28), and the distance between the mounting rack (9) and the frame (1) is adjusted.