CN114379124A

CN114379124A - Preparation method of environment-friendly PVA-based film

Info

Publication number: CN114379124A
Application number: CN202111640451.8A
Authority: CN
Inventors: 李莉; 李汪洋; 王琪; 聂敏; 陈宁; 吴磊; 刘鹏举; 李怡俊; 贺允; 刘梦茹
Original assignee: Anhui Ruihong New Material Technology Co ltd
Current assignee: Anhui Ruihong New Material Technology Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-04-22

Abstract

The invention discloses a preparation method of an environment-friendly PVA-based film, which belongs to the technical field of film preparation and comprises the following steps: the method comprises the following steps: adding the PVA-based raw material into an extruder, and extruding the PVA-based film from a die head by the extruder; step two: cooling the PVA-based film extruded in the first step by a cooling roller, and cooling and forming the PVA-based film; step three: the formed PVA-based film is drawn and stretched to pass below the cutting blade and is fixed on a winding drum; step four: winding the winding drum, adjusting the tension by using a fixed roller, and cutting edges of the cutting blades after winding; the invention not only realizes the rolling and flattening, but also ensures the quality of the produced plastic film roll; the plastic film winding drum is convenient to replace, and the production efficiency is improved; the phenomenon of wrinkling caused by insufficient tension in the process of forming and winding the film is realized, and the processing efficiency of the film is greatly improved; the dust removal on the two sides of the film is realized, and the sanitary quality of the film is improved.

Description

Preparation method of environment-friendly PVA-based film

Technical Field

The invention belongs to the technical field of film preparation, and particularly relates to a preparation method of an environment-friendly PVA-based film.

Background

The plastic film is widely used in the fields of textile, food, daily necessities, pesticide, medicine packaging and the like, and the processing methods of the plastic film comprise an extrusion method, a blow molding method, a calendaring method, a tape casting method and a stretching method, wherein the most used method is the extrusion method, namely, the plastic film is extruded after raw materials are heated and melted, then the plastic film is cooled and formed, and then the plastic film is drawn and coiled to finish a coiled finished product.

Disclosure of Invention

The invention provides a preparation method of an environment-friendly PVA-based film, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of an environment-friendly PVA-based film comprises the following steps:

the method comprises the following steps: adding the PVA-based raw material into an extruder, and extruding the PVA-based film from a die head by the extruder;

step two: cooling the PVA-based film extruded in the first step by a cooling roller, and cooling and forming the PVA-based film;

step three: the formed PVA-based film is drawn and stretched to pass below the cutting blade and is fixed on a winding drum;

step four: the reel carries out the rolling, utilizes the fixed roll to adjust the tensile force, and after the rolling was accomplished, cutting blade cut edge, takes off the reel again, accomplishes the finished product.

Preferably, a cooling roller is arranged below a discharge die head of the extruder, two ends of the cooling roller are rotatably connected with supporting rods, a first motor is fixed on the supporting rods, the output end of the first motor is connected to one end of the cooling roller, a compression roller is arranged above the cooling roller, a steering roller is arranged on one side of each supporting rod, a support is arranged on one side of each steering roller, a support plate is arranged on one side of each support, a cleaning mechanism is arranged on one side of each support plate, a winding drum is arranged on one side of each cleaning mechanism, jacks are arranged in the winding drum, and fixing mechanisms are arranged at two ends of each winding drum;

the fixing mechanism comprises a movable shaft arranged in the jack, the outer surface of the movable shaft is uniformly provided with convex blocks, the jack is correspondingly matched with the movable shaft and the convex block, one end of the movable shaft far away from the winding drum is provided with a first spring, a cylinder body is arranged outside the first spring, the first spring is connected inside the cylinder body, a fixed disc is arranged at one end of the cylinder body close to the winding drum, the other end of the cylinder body is rotatably connected with a supporting seat, the movable shaft and the convex block penetrate through the fixed disc and extend into the jack, the upper end and the lower end of the cylinder body are provided with first notches, a moving block is arranged in the first notch and fixed on the convex block, one end of one group of the cylinder bodies which is rotationally connected on the supporting seat is connected with the output end of a second motor, and a rack is arranged outside the second motor and fixed on the side wall of the supporting seat.

Preferably, the top of reel is provided with the flattening roller, the inside of flattening roller is rotated and is connected with first horizontal pole, the both ends of first horizontal pole are provided with the removal post, the outside of removing the post is provided with the spacing groove, the upper end of removing the post is connected with second spring one end, the other end of second spring is connected on spacing inslot portion top, the inside at the supporting seat is seted up to the spacing groove, one side that the spacing groove is close to first horizontal pole is provided with the second notch, first horizontal pole runs through the second notch.

Preferably, the upper end of support is provided with first cylinder, the output of first cylinder is provided with the second horizontal pole, the both ends of second horizontal pole are provided with the slider, slider sliding connection is on the support, the lower extreme of second horizontal pole is provided with cutting blade.

Preferably, the outside of slider is provided with the spout, the spout is seted up on the support surface, the slider inlays to be sliding connection in the inside of support.

Preferably, the two sides of the bracket are both provided with equal-height auxiliary rollers.

Preferably, be provided with the fixed roll in the backup pad, the roll surface upper end of fixed roll is provided with pressure sensor, the lower extreme of backup pad is provided with the second cylinder, the both sides of backup pad all are provided with equal altitude tensioning roller, pressure sensor's input signal end is connected with the controller, the second cylinder is connected to the signal output part of controller.

Preferably, the cleaning mechanism comprises a dust collection box, the upper end of the dust collection box is communicated with an exhaust fan suction opening, the exhaust fan is fixed at the upper end of the dust collection box, one side of the dust collection box is provided with one end of two groups of vent pipes, the other end of the vent pipes is connected with a dust collection cover, and air suction ports of the dust collection cover are respectively positioned above and below the traction film.

Preferably, the inside of dust collection box is provided with the filter screen, the front and back side of filter screen all is provided with the draw runner, the outside of draw runner is provided with the recess, the recess is seted up on the inner wall of dust collection box, the lower extreme of filter screen is provided with the shrouding, the lower extreme of shrouding is provided with the pull handle, the lower extreme of dust collection box is provided with the turning block, the shrouding lower extreme is hugged closely to the up end of turning block.

Preferably, a rotating bearing is arranged outside one end of the vent pipe close to the dust collection box, and the rotating bearing is fixed outside the dust collection box.

Compared with the prior art, the invention has the beneficial effects that: the invention not only realizes the rolling and flattening, but also ensures the quality of the produced plastic film roll; the plastic film winding drum is convenient to replace, and the production efficiency is improved; the phenomenon of wrinkling caused by insufficient tension in the process of forming and winding the film is realized, and the processing efficiency of the film is greatly improved; the dust removal on the two sides of the film is realized, and the sanitary quality of the film is improved;

(1) according to the invention, the leveling roller is tightly attached to the upper end of the film wound outside the winding drum, and the leveling roller is tightly attached to the upper end of the film due to the reset pressure of the second spring, so that the leveling roller can level the wound plastic film in the winding process, and the film winding quality of the plastic film is improved;

(2) the movable shaft, the lug and the winding drum are conveniently spliced and fixed through the matching of the barrel, the spring, the moving block, the first notch and other mechanisms, the winding drum replacing operation is simple, the fixing is firm and reliable, the time and the labor are saved, the using effect is good, and the production efficiency is improved;

(3) according to the invention, the pressure sensor detects the pressure through the matching of the pressure sensor, the second cylinder, the controller, the supporting plate and the like, the supporting plate and the fixing roller are driven to ascend or descend through the second cylinder, so that the tension of the plastic film is increased or decreased, the problems that the tension of the plastic film is too large to cause stretch-break and delay production, the tension of the plastic film is too small to cause fluffy and uneven coiled films, the quality of the produced coiled films is low, or the coiled films cannot be produced are solved, and the production quality and the production efficiency of the coiled films are improved by automatically adjusting the tension of the plastic film.

(4) The interior of the dust collection box is pumped into negative pressure through the arranged exhaust fan, so that dust and impurities attached to the plastic film between the dust collection covers can be pumped into the interior of the dust collection box through the vent pipe and adsorbed on the filter screen, dust collection before rolling of the plastic film can be achieved, the sanitary quality of the plastic film is improved, meanwhile, the filter screen is convenient to clean and replace, the rotating block is rotated, the pull handle is pulled, the filter screen can be drawn out, after cleaning or replacement is completed, the sliding strip is inserted into the groove to complete installation, then the rotating block is rotated to enable the rotating block to compress the sealing plate, fixing is completed, installation and disassembly are simple and rapid, and use is convenient.

Drawings

FIG. 1 is a schematic structural diagram of a method for preparing an environment-friendly PVA-based film according to the present invention.

FIG. 2 is a schematic view of a connection structure of the position-limiting groove, the moving post, the second spring, the first cross bar and the leveling roller according to the present invention.

Fig. 3 is a schematic structural diagram of the fixing mechanism of the present invention.

FIG. 4 is a schematic view of the connection structure of the movable shaft and the fixed disk of the present invention.

FIG. 5 is a schematic view of the connection structure of the winding drum, the bump and the movable shaft according to the present invention.

FIG. 6 is a perspective view of the protrusion and the movable shaft of the present invention.

FIG. 7 is a side view of the support base of the present invention.

FIG. 8 is a schematic structural diagram of the cleaning mechanism of the present invention.

Fig. 9 is a side view of the stent of the present invention.

In the figure: 1. an extruder; 2. a compression roller; 3. a first motor; 4. a cooling roll; 5. a support; 6. a first cylinder; 7. a slider; 8. a support plate; 9. a cleaning mechanism; 91. an exhaust fan; 92. a dust collection box; 93. a groove; 94. a slide bar; 95. a filter screen; 96. rotating the block; 97. pulling a handle; 98. a rotating bearing; 99. a dust hood; 910. a breather pipe; 10. a supporting seat; 11. a frame; 12. a second motor; 13. a reel; 14. a fixing mechanism; 141. a barrel; 142. a first spring; 143. a first notch; 144. a bump; 145. a movable shaft; 146. fixing the disc; 147. a moving block; 15. a jack; 16. a limiting groove; 17. moving the column; 18. a second spring; 19. a first cross bar; 20. a leveling roller; 21. a tension roller; 22. a second cylinder; 23. a fixed roller; 24. an auxiliary roller; 25. a turning roll; 26. a strut; 27. a second notch; 28. a second cross bar; 29. and (4) cutting the blade.

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.

Referring to fig. 1-9, the present invention provides the following technical solutions:

example 1

A preparation method of an environment-friendly PVA-based film comprises the following steps:

the method comprises the following steps: adding a PVA-based raw material into an extruder 1, and extruding a PVA-based film from a die head by the extruder 1;

step two: cooling the PVA-based film extruded in the first step by a cooling roller 4, and cooling and forming the PVA-based film;

step three: the formed PVA-based film is drawn and stretched to pass below the cutting blade 29 and is fixed on a winding drum;

step four: the winding drum 13 is wound, the tension is adjusted by the fixing roller 23, after winding is completed, the cutting blade 29 is cut edge, and then the winding drum is taken down to complete a finished product.

Example 2

As an optional situation, please refer to fig. 1, 2-6, and 9, a cooling roller 4 is disposed below a discharge die head of an extruder 1, two ends of the cooling roller 4 are rotatably connected with supporting rods 26, a first motor 3 is fixed on the supporting rods 26, an output end of the first motor 3 is connected to one end of the cooling roller 4, a press roller 2 is disposed above the cooling roller 4, a turning roller 25 is disposed on one side of the supporting rods 26, a support 5 is disposed on one side of the turning roller 25, a supporting plate 8 is disposed on one side of the support 5, a cleaning mechanism 9 is disposed on one side of the supporting plate 8, a winding drum 13 is disposed on one side of the cleaning mechanism 9, an insertion hole 15 is disposed inside the winding drum 13, and fixing mechanisms 14 are disposed at two ends of the winding drum 13;

the fixing mechanism 14 comprises a movable shaft 145 arranged inside the insertion hole 15, the outer surface of the movable shaft 145 is uniformly provided with a convex block 144, the insertion hole 15 is correspondingly matched with the movable shaft 145 and the convex block 144, one end of the movable shaft 145 far away from the winding drum 13 is provided with a first spring 142, the outside of the first spring 142 is provided with a cylinder body 141, the first spring 142 is connected inside the cylinder body 141, one end of the cylinder body 141 close to the winding drum 13 is provided with a fixed disc 146, the other end of the cylinder body 141 is rotatably connected with a supporting seat 10 and the movable shaft 145, the convex block 144 penetrates through the fixed disc 146 and extends into the insertion hole 15, the upper end and the lower end of the cylinder 141 are respectively provided with a first notch 143, a moving block 147 is arranged in the first notch 143, the moving block 147 is fixed on the convex block 144, one end of the group of cylinders 141 which are rotatably connected to the supporting seat 10 is connected with the output end of the second motor 12, the outer portion of the second motor 12 is provided with a rack 11, and the rack 11 is fixed on the side wall of the supporting seat 10.

In the embodiment, in order to facilitate trimming, the upper end of the bracket 5 is provided with a first cylinder 6, the output end of the first cylinder 6 is provided with a second cross bar 28, two ends of the second cross bar 28 are provided with sliders 7, the sliders 7 are slidably connected to the bracket 5, and the lower end of the second cross bar 28 is provided with a cutting blade 29; for slider 7 steadily slides, the outside of slider 7 is provided with the spout, and the spout is seted up on support 5 surface, and slider 7 inlays and be sliding connection in support 5's inside, for making the cutting atress more easily, makes the film level and smooth, and the both sides of support 5 all are provided with equal-height auxiliary roller 24.

Specifically, the raw materials are put into the extruder 1, the extruder 1 is started, at the moment, the plastic film extruded by the extruder 1 is rapidly cooled by the cooling roller 4, the first motor 4 drives the cooling roller 4 to rotate, the compression roller 2 can compress the plastic film in the cooling process, the thickness uniformity of the plastic film is ensured, the forming quality of the plastic film is improved, the plastic film bypasses the steering roller 25, passes through the lower part of the cutting blade 29 and is wound and fixed on the outer side of the winding drum 13, the second motor 12 is started, the drum 141 is driven to rotate by the second motor 12, the winding drum 13 is driven to rotate, after the plastic film is wound fully, the first cylinder 6 drives the cutting blade 29 to cut the plastic film, when the winding drum 13 needs to be replaced, the moving block 147 is moved towards two sides, the moving shaft 145 and the lug 144 are drawn out from the inserting hole 15, the winding drum 13 is taken out, and a new one end inserting hole 15 and one end moving shaft 145 of the winding drum 13 are taken out, The lug 144 is inserted, and behind the other end movable block 147, under the effect of first spring 142, make its other end loose axle 145, lug 144 block insert in reel 13 other end jack 15, accomplish fixedly, through jack 15 and one end loose axle 145, lug 144 cooperation, can not produce relative motion when making it rotate, this device change reel 13 easy operation, it is simultaneously fixed firm reliable, labour saving and time saving, excellent in use effect improves production efficiency.

Example 3

As an optional situation, please refer to fig. 2 and 7, a leveling roller 20 is disposed above the winding drum 13, a first cross bar 19 is rotatably connected inside the leveling roller 20, moving posts 17 are disposed at two ends of the first cross bar 19, a limiting groove 16 is disposed outside the moving posts 17, one end of a second spring 18 is connected to an upper end of the moving posts 17, the other end of the second spring 18 is connected to a top end inside the limiting groove 16, the limiting groove 16 is disposed inside the supporting base 10, a second notch 27 is disposed on one side of the limiting groove 16 close to the first cross bar 19, and the first cross bar 19 penetrates through the second notch 27.

Specifically, carry out the rolling to the plastic film who finishes processing, leveling roller 20 hugs closely at the outside roll membrane upper end of book at reel 13 this moment, because the reset pressure of second spring 18 makes leveling roller 20 hug closely at roll membrane upper end, like this at the in-process of rolling, leveling roller 20 can carry out the flattening to the plastic film who comes in the rolling, improves the quality that plastic film rolled up the membrane.

The scheme in this embodiment can be selectively combined with the scheme in other embodiments. Example 4

As an optional situation, referring to fig. 1, a fixed roller 23 is disposed on the support plate 8, a pressure sensor is disposed at an upper end of a roller surface of the fixed roller 23, a second cylinder 22 is disposed at a lower end of the support plate 8, equal-height tensioning rollers 21 are disposed on both sides of the support plate 8, an input signal end of the pressure sensor is connected to a controller, and a signal output end of the controller is connected to the second cylinder 22.

Specifically, when plastic film passes through the pressure sensor who sets up on fixed roll 23 roll surface, make pressure sensor detect the pressure that receives, when the pressure that receives is too big, drive backup pad 8 and fixed roll 23 decline through second cylinder 22, make the plastic film tensioning force diminish, prevent that the too big stretching force of plastic film from leading to the stretch-breaking, delay production, when the pressure that receives is too little, drive backup pad 8 and fixed roll 23 through second cylinder 22 and rise, make the plastic film tensioning force grow, prevent that the plastic film tensioning force undersize from leading to the roll membrane of batching fluffy, the unevenness, the roll membrane quality of production is low, or can't the lapping, through the automatic tensioning force of adjusting plastic film, improve its roll membrane's production quality and production efficiency.

The scheme in this embodiment can be selectively combined with the scheme in other embodiments.

Example 5

As an optional situation, please refer to fig. 1 and 8, the cleaning mechanism 9 includes a suction box 92, an upper end of the suction box 92 is communicated with a suction opening of an exhaust fan 91, the exhaust fan 91 is fixed at an upper end of the suction box 92, one side of the suction box 92 is provided with one end of two sets of vent pipes 910, the other end of the vent pipes 910 is connected with a suction hood 99, and suction ports of the suction hood 99 are respectively located above and below the traction film.

In this embodiment, in order to prevent that the dust from directly discharging to the air, the inside of dust suction box 92 is provided with filter screen 95, and the front and back side of filter screen 95 all is provided with draw runner 94, and the outside of draw runner 94 is provided with recess 93, and recess 93 sets up on the inner wall of dust suction box 92, and the lower extreme of filter screen 95 is provided with the shrouding, and the lower extreme of shrouding is provided with draws handle 97, and the lower extreme of dust suction box 92 is provided with turning block 96, and the shrouding lower extreme is hugged closely to the up end of turning block 96.

In this embodiment, in order to facilitate the adjustment of the dust hood 99 to be always located above and below the plastic film and improve the applicability thereof, the rotating bearing 98 is disposed outside one end of the ventilation pipe 910 close to the dust box 92, and the rotating bearing 98 is fixed outside the dust box 92.

Specifically, start air exhauster 91, air exhauster 91 is the negative pressure of taking out into suction box 92 is inside, will pass through breather pipe 910 suction box 92's inside through adnexed dust and impurity on the plastic film between suction hood 99 like this, and adsorb on filter screen 95, thereby can realize the dust removal before the plastic film rolling, improve plastic film's sanitary quality, filter screen 95 is convenient for clear up the change simultaneously, rotatory turning block 96, draw and draw handle 97 and can take out filter screen 95, after clearance or change completion, insert the installation in recess 93 with draw runner 94, rotatory turning block 96 makes it compress tightly the shrouding again, accomplish fixedly.

The working principle and the using process of the invention are as follows: the raw materials are put into an extruder 1, the extruder 1 is started, at the moment, a plastic film extruded by the extruder 1 is rapidly cooled by a cooling roller 4, a first motor 4 drives the cooling roller 4 to rotate, a compression roller 2 can compress the plastic film in the cooling process, the thickness of the plastic film is ensured to be uniform, the forming quality of the plastic film is improved, the plastic film bypasses a steering roller 25, passes through the lower part of a cutting blade 29 and is wound and fixed on the outer side of a winding drum 13, a second motor 12 is started, the second motor 12 drives a drum body 141 to rotate so as to drive the winding drum 13 to rotate, after the plastic film is wound fully, a first air cylinder 6 drives the cutting blade 29 to cut the plastic film, when the winding drum 13 needs to be replaced, a moving block 147 is moved towards two sides, so that a movable shaft 145 and a lug 144 are drawn out from an insertion hole 15, the winding drum 13 is taken out, and a new insertion hole 15 at one end and a movable shaft 145 at one end of the winding drum 13 are connected with the new insertion hole 145, The bump 144 is inserted, after the other end moves the block 147, under the action of the first spring 142, the other end movable shaft 145 and the bump 144 are clamped and inserted into the jack 15 at the other end of the winding drum 13, and the fixation is completed, and the jack 15 is matched with the one end movable shaft 145 and the bump 144, so that the relative motion is not generated when the winding drum rotates, the device has the advantages of simple operation of replacing the winding drum 13, firm and reliable fixation, time and labor saving, good use effect and production efficiency improvement, and can be used for winding the processed plastic film, the leveling roller 20 is tightly attached to the upper end of the winding drum outside the winding drum 13 at the moment, and the leveling roller 20 is tightly attached to the upper end of the winding drum due to the reset pressure of the second spring 18, so that the leveling roller 20 can level the wound plastic film in the winding process, and the quality of the plastic film is improved;

when the plastic film passes through the pressure sensor arranged on the roll surface of the fixed roll 23, the pressure sensor detects the pressure, when the pressure is too high, the second cylinder 22 drives the support plate 8 and the fixed roll 23 to descend, so that the tension of the plastic film is reduced, the stretching-out caused by too high tension of the plastic film is prevented, the production is delayed, when the pressure is too low, the second cylinder 22 drives the support plate 8 and the fixed roll 23 to ascend, the tension of the plastic film is increased, the phenomenon that the rolled film is fluffy and uneven due to too low tension of the plastic film, the quality of the produced rolled film is low or the rolled film cannot be rolled is prevented, and the tension of the plastic film is automatically adjusted, so that the production quality and the production efficiency of the rolled film are improved;

in the production process, start air exhauster 91, air exhauster 91 takes out into the negative pressure with suction box 92 is inside, dust and impurity that adhere to will pass through breather pipe 910 suction negative suction box 92's inside on the plastic film between suction hood 99 like this, and adsorb on filter screen 95, thereby can realize the dust removal before the plastic film rolling, improve plastic film's sanitary quality, filter screen 95 is convenient for clear up the change simultaneously, rotatory turning block 96, draw and draw handle 97 and can take out filter screen 95, after clearance or change completion, insert the installation in recess 93 with draw runner 94, rotatory turning block 96 makes it compress tightly the shrouding again, accomplish fixedly.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The preparation method of the environment-friendly PVA-based film is characterized by comprising the following steps:

the method comprises the following steps: adding a PVA-based raw material into an extruder (1), and extruding a PVA-based film from a die head by the extruder (1);

step two: cooling the PVA-based film extruded in the first step by a cooling roller (4) and cooling and forming the PVA-based film;

step three: the formed PVA-based film is drawn and stretched to pass below a cutting blade (29) and is fixed on a reel;

step four: and (3) winding the winding drum (13), adjusting the tension by using the fixed roller (23), cutting the edges of the cutting blades (29) after the winding is finished, and taking down the winding drum to finish a finished product.

2. The method for preparing an environmentally friendly PVA-based film according to claim 1, wherein: a cooling roller (4) is arranged below a discharge die head of the extruder (1), two ends of the cooling roller (4) are rotatably connected with supporting rods (26), a first motor (3) is fixed on the supporting rod (26), the output end of the first motor (3) is connected with one end of the cooling roller (4), a press roll (2) is arranged above the cooling roll (4), a steering roll (25) is arranged on one side of the support rod (26), a bracket (5) is arranged on one side of the steering roller (25), a support plate (8) is arranged on one side of the bracket (5), a cleaning mechanism (9) is arranged on one side of the supporting plate (8), a winding drum (13) is arranged on one side of the cleaning mechanism (9), the inside of the winding drum (13) is provided with an insertion hole (15), and two ends of the winding drum (13) are provided with fixing mechanisms (14);

the fixing mechanism (14) comprises a movable shaft (145) arranged in an insertion hole (15), convex blocks (144) are uniformly arranged on the outer surface of the movable shaft (145), the insertion hole (15) is correspondingly matched with the movable shaft (145) and the convex blocks (144), a first spring (142) is arranged at one end, far away from the winding drum (13), of the movable shaft (145), a drum body (141) is arranged outside the first spring (142), the first spring (142) is connected inside the drum body (141), a fixed disc (146) is arranged at one end, close to the winding drum (13), of the drum body (141), the other end of the drum body is rotatably connected with a supporting seat (10), the movable shaft (145) and the convex blocks (144) penetrate through the fixed disc (146) and extend into the insertion hole (15), first notches (143) are arranged at the upper end and the lower end of the drum body (141), and a moving block (147) is arranged in the first notches (143), the moving block (147) is fixed on the bump (144), one end of one group of the cylinders (141) which is rotatably connected to the supporting seat (10) is connected with the output end of a second motor (12), a rack (11) is arranged outside the second motor (12), and the rack (11) is fixed on the side wall of the supporting seat (10).

3. The method for preparing an environmentally friendly PVA-based film according to claim 2, wherein: the top of reel (13) is provided with leveling roller (20), the inside rotation of leveling roller (20) is connected with first horizontal pole (19), the both ends of first horizontal pole (19) are provided with and remove post (17), the outside of removing post (17) is provided with spacing groove (16), the upper end of removing post (17) is connected with second spring (18) one end, the other end of second spring (18) is connected on the inside top in spacing groove (16), the inside at supporting seat (10) is seted up in spacing groove (16), one side that spacing groove (16) is close to first horizontal pole (19) is provided with second notch (27), second notch (27) are run through in first horizontal pole (19).

4. The method for preparing an environmentally friendly PVA-based film according to claim 2, wherein: the upper end of support (5) is provided with first cylinder (6), the output of first cylinder (6) is provided with second horizontal pole (28), the both ends of second horizontal pole (28) are provided with slider (7), slider (7) sliding connection is on support (5), the lower extreme of second horizontal pole (28) is provided with cutting blade (29).

5. The method for preparing an environmentally friendly PVA-based film according to claim 4, wherein: the outside of slider (7) is provided with the spout, the spout is seted up on support (5) surface, slider (7) inlay the inside that is sliding connection in support (5).

6. The method for preparing an environmentally friendly PVA-based film according to claim 4, wherein: and the two sides of the bracket (5) are provided with equal-height auxiliary rollers (24).

7. The method for preparing an environmentally friendly PVA-based film according to claim 1, wherein: be provided with on backup pad (8) fixed roll (23), the roll surface upper end of fixed roll (23) is provided with pressure sensor, the lower extreme of backup pad (8) is provided with second cylinder (22), the both sides of backup pad (8) all are provided with tensioning roller (21) such as high, pressure sensor's input signal end is connected with the controller, second cylinder (22) are connected to the signal output part of controller.

8. The method for preparing an environmentally friendly PVA-based film according to claim 2, wherein: clearance mechanism (9) are including suction box (92), the upper end intercommunication of suction box (92) has air exhauster (91) suction opening, air exhauster (91) are fixed in suction box (92) upper end, one side of suction box (92) is provided with two sets of breather pipe (910) one end, the other end of breather pipe (910) is connected with suction hood (99), the induction port of suction hood (99) is located the upper and lower side of pulling the film respectively.

9. The method for preparing an environmentally friendly PVA-based film according to claim 8, wherein: the inside of suction box (92) is provided with filter screen (95), the front and back side of filter screen (95) all is provided with draw runner (94), the outside of draw runner (94) is provided with recess (93), recess (93) are seted up on the inner wall of suction box (92), the lower extreme of filter screen (95) is provided with the shrouding, the lower extreme of shrouding is provided with draws handle (97), the lower extreme of suction box (92) is provided with turning block (96), the shrouding lower extreme is hugged closely to the up end of turning block (96).

10. The method for preparing an environmentally friendly PVA-based film according to claim 8, wherein: the outer part of one end of the ventilating pipe (910) close to the dust collection box (92) is provided with a rotating bearing (98), and the rotating bearing (98) is fixed on the outer part of the dust collection box (92).