A physically moisture-absorbing bopp film and a method for manufacturing the same

Abstract

The application discloses a kind of physical hygroscopic BOPP film and preparation method thereof, comprising the following steps: S1 mixing: raw materials are put into mixing device and uniformly mixed;S2 melt extrusion: the raw materials after mixing are fed into extruder by feeder, filtered by filter and sent to die head to converge, and extruded into sheet;S3 forming: after cooling, transverse and longitudinal stretching, traction, winding process, BOPP film is obtained, and BOPP film roll is obtained;The application relates to the technical field of film.The physical hygroscopic BOPP film and preparation method thereof are provided with the setting throwing assembly, which realizes the operation of throwing material multiple times.This way can ensure that the material does not accumulate after falling, thereby enhancing the mixing efficiency of the equipment and improving the use effect of the device, to improve the working efficiency of film making and the uniformity of film making effect, so that the quality effect of the prepared film is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thin films, in particular to a physically hygroscopic BOPP film and a preparation method thereof. BACKGROUND

[0002] BOPP film is generally a multi-layer co-extrusion film, which is made of polypropylene particles by co-extrusion into a sheet, and then stretched in the longitudinal and transverse directions. It is non-toxic, odorless and tasteless, and can be directly contacted with food and medicine. Due to the molecular orientation of stretching, the physical stability, mechanical strength and air tightness of BOPP film are good, and the transparency and gloss are high, and it is tough and wear-resistant.

[0003] One of the key indicators of BOPP film products is the gloss of the matte surface and the uniformity of its distribution, that is, the appearance effect at each position in the length and width directions of the film is consistent, and uneven distribution will lead to a cloudy appearance. However, during the production of BOPP film, due to the one-time input of raw materials, the mixing of raw materials is uneven, which limits the uniformity of BOPP film to a certain extent. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a physically hygroscopic BOPP film and a preparation method thereof, which solves the technical problems mentioned in the background art.

[0005] To achieve the above purpose, the present application is realized by the following technical scheme: a preparation method of a physically hygroscopic BOPP film, comprising the following steps:

[0006] S1 mixing: the raw materials are put into the mixing device, the raw materials entering the inside of the stirring barrel are subjected to controlled amount treatment by the feeding assembly and the material control assembly, and the raw materials subjected to quantitative and uniform speed conveying are subjected to throwing by the throwing assembly, and the raw materials entering the stirring barrel are subjected to stirring and mixing treatment by the stirring assembly, and the operation of throwing the materials multiple times uniformly mixes the raw materials;

[0007] S2 melt extrusion: the mixed PP resin is fed into the extruder through the feeding machine, is melted and plasticized, and then is extruded in the form of melt, is filtered through the filter, and then the two groups of melt are sent to the die by the metering pump to converge, and are extruded into a sheet;

[0008] S3 forming: through the processes of cooling, transverse and longitudinal stretching, traction and winding, the BOPP film is obtained.

[0009] As a further preferred embodiment of the present technical solution, the mixing device comprises a stirring barrel, a feeding assembly, a control assembly, a stirring assembly, a throwing assembly, a cleaning assembly and a baffle.

[0010] As a further preferred embodiment of the present technical solution, the feeding assembly comprises support columns fixedly installed on both sides of the top of the stirring barrel, and a feeding hopper fixedly connected to the top of the support columns, wherein a lower hopper is arranged below the feeding hopper, and the bottom of the lower hopper penetrates through the top of the stirring barrel and extends into the inner cavity.

[0011] As a further preferred embodiment of the present technical solution, the control assembly comprises a sliding block slidingly installed between the feeding hopper and the lower hopper, first telescopic cylinders arranged at both ends of the outer side of the sliding block for moving the sliding block, and a discharging groove arranged on the inner wall of the sliding block and fixedly connected with a stop block.

[0012] As a further preferred embodiment of the present technical solution, the stirring assembly comprises a support plate fixedly installed between the two feeding hoppers, a first servo motor fixedly connected to the top of the support plate, a rotating rod fixedly connected to the output end of the first servo motor, a fixed rod extending from the bottom of the rotating rod into the inner cavity of the stirring barrel, a cylinder arranged in the inner part of the fixed rod, and stirring blades fixedly connected to the outer wall of the cylinder.

[0013] As a further preferred embodiment of the present technical solution, the fixed rod comprises a connecting portion and a fixed portion, and the cylinder is fixedly installed between the connecting portion and the fixed portion.

[0014] As a further preferred embodiment of the present technical solution, the cleaning assembly comprises positioning rods fixedly installed on both sides of the outer wall of the connecting portion and the fixed portion, a moving rod slidingly connected to the inner part of the positioning rods, a scraper fixedly connected to one end of the moving rod and extending to the outside of the positioning rods, a threaded rod screwedly connected to the inner part of the moving rod, one end of the threaded rod penetrating through the connecting portion and extending into the inner cavity of the connecting portion, the threaded rod being rotatably installed on the fixed rod, a first bevel gear fixedly connected to one end of the threaded rod, a second servo motor fixedly installed in the inner cavity of the fixed portion, a driving rod fixedly connected to the output end of the second servo motor, the top of the driving rod penetrating through the cylinder and being rotatably connected with the inner wall of the connecting portion, the driving rod being rotatably connected with the cylinder, second bevel gears fixedly connected to the upper and lower ends of the outer wall of the driving rod, and the two ends of the second bevel gears being in meshing transmission with the first bevel gear.

[0015] As a further preferred, the throwing assembly comprises a connecting ring fixedly installed on the outer wall of the rotating rod, the outer wall of the connecting ring is fixedly connected with two fan-shaped blocks, and the two fan-shaped blocks are symmetrically arranged, the top of the fan-shaped block is fixedly connected with a discharging protrusion, the outer side of the fan-shaped block is provided with a knocking mechanism, and the upper side of the discharging protrusion is provided with a rotating plate, and the rotating plate is rotatably installed on the inner wall of the stirring barrel.

[0016] As a further preferred, the knocking mechanism comprises a fixed cylinder fixedly installed on the inner wall of the stirring barrel, and the fixed cylinder is located below the rotating plate, the inner cavity of the fixed cylinder is fixedly connected with a spring, the other end of the spring is fixedly connected with a movable rod, the other end of the movable rod extends to the outside through the fixed cylinder, and the bottom of one end of the movable rod is fixedly connected with a contact rod, and the position of the contact rod corresponds to the position of the fan-shaped block.

[0017] The embodiment of the application also discloses a physical moisture absorption BOPP film prepared by the preparation method.

[0018] Compared with the prior art, the application has the following beneficial effects:

[0019] (1) The feeding assembly and the material control assembly can control the feeding amount of the raw materials to be mixed, so that the phenomenon of uneven feeding is avoided, the accuracy is controlled, the quantitative feeding of the raw materials is realized, the phenomenon of too much raw materials in one time during the working process is prevented to the greatest extent, and the mixing effect is good.

[0020] (2) The throwing assembly can move the movable rod to the rotating plate to knock the rotating plate, and the fan-shaped block can realize the operation of throwing the materials multiple times in the continuous rotating process, so that the materials are not stacked after falling, the mixing efficiency of the equipment is enhanced, the use effect of the device is improved, the working efficiency of the film preparation and the uniformity of the film preparation are improved, and the quality of the prepared film is better. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole structure schematic view of the application;

[0022] Figure 2 It is a structure schematic view of the feeding assembly and the material control assembly in the application;

[0023] Figure 3 It is a structure schematic view of the stirring assembly in the application;

[0024] Figure 4 It is a structure schematic view of the cleaning assembly in the application;

[0025] Figure 5 It is a structure schematic view of the throwing assembly in the application.

[0026] In the figure: 1, stirring barrel; 2, feeding assembly; 3, material control assembly; 4, stirring assembly; 5, throwing assembly; 6, cleaning assembly; 7, baffle; 21, feeding hopper; 22, support column; 23, lower hopper; 31, sliding block; 32, first telescopic cylinder; 33, discharging chute; 34, stop block; 41, support plate; 42, first servo motor; 43, rotating rod; 44, fixed rod; 441, connecting part; 442, fixed part; 45, barrel; 46, stirring blade; 51, connecting ring; 52, sector block; 53, discharging protrusion; 54, rotating plate; 55, fixed barrel; 56, spring; 57, movable rod; 58, abutting rod; 61, positioning rod; 62, moving rod; 63, scraper; 64, threaded rod; 65, first bevel gear; 66, second bevel gear; 67, driving rod; 68, second servo motor; 71, support rod; 72, second telescopic cylinder. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0028] Please refer to Figures 1-5 The present application provides a technical solution: a preparation method of a physical moisture-absorbing BOPP film, comprising the following steps:

[0029] S1 mixing: the raw materials are put into a mixing device, the raw materials entering the inside of a stirring barrel 1 are subjected to material control treatment by a feeding assembly 2 and a material control assembly 3, and the quantitatively and uniformly transported raw materials are subjected to throwing by a throwing assembly 5, and the raw materials entering the stirring barrel 1 are subjected to stirring and mixing treatment by a stirring assembly 4, and the operation of throwing the materials multiple times uniformly mixes the raw materials;

[0030] S2 melting and extrusion: the mixed PP resin is fed into an extruder through a feeder, is melted and plasticized, and then is extruded in the form of a melt, is filtered through a filter, and then two groups of melts are sent to a die by a metering pump to be combined, and a sheet is extruded;

[0031] According to the raw material ratio, an outer layer mixed material and an outer layer mixed material are obtained, the outer layer mixed material and the outer layer mixed material are respectively sent into two groups of screw extruders, are melted and plasticized, are filtered through a filter, and then two groups of melts are sent to a die by a metering pump to be combined, and a sheet is extruded, the outer layer mixed material comprises an antibacterial master batch and an antistatic agent, and the outer layer mixed material comprises an antibacterial master batch and an anti-adhesive agent, the temperature of the extruder is controlled to be 220-280 DEG C, and the temperature of the die is controlled to be 220-280 DEG C;

[0032] S3 forming: through cooling, transverse and longitudinal stretching, traction, winding process, BOPP film is obtained.

[0033] As Figures 1-5 shown, the mixing device includes a stirring barrel 1, a feeding assembly 2, a control assembly 3, a stirring assembly 4, a throwing assembly 5, a cleaning assembly 6 and a baffle 7, the feeding assembly 2 is arranged at the top of the stirring barrel 1 on both sides, the control assembly 3 is arranged on the feeding assembly 2, the stirring assembly 4 is arranged inside the stirring barrel 1, the throwing assembly 5 is arranged inside the stirring barrel 1 and located on both sides of the stirring assembly 4, and the cleaning assembly 6 is located inside the stirring barrel 1.

[0034] As Figure 2 shown, the feeding assembly 2 includes support columns 22 fixedly installed at the top of the stirring barrel 1 on both sides, the top of the support column 22 is fixedly connected with a feeding hopper 21, a lower hopper 23 is arranged below the feeding hopper 21, the bottom of the lower hopper 23 penetrates through the top of the stirring barrel 1 and extends to the inner cavity, in the embodiment of the present application, the support column 22 supports the feeding hopper 21, and the raw materials enter the stirring barrel 1 for mixing treatment through the feeding hopper 21 and the lower hopper 23.

[0035] As Figure 2 shown, the control assembly 3 includes a sliding block 31 slidingly installed between the feeding hopper 21 and the lower hopper 23, first telescopic cylinders 32 for moving the sliding block 31 are arranged at the outer sides of both ends of the sliding block 31, a discharging groove 33 is arranged on the inner wall of the sliding block 31, and a stop block 34 is fixedly connected to the inner wall of the discharging groove 33, in the embodiment of the present application, the size of the discharging groove 33 and the stop block 34 is the same as that of the discharge port of the feeding hopper 21, when the first telescopic cylinder 32 drives the sliding block 31 to move and the stop block 34 corresponds to the bottom of the feeding hopper 21, the bottom of the feeding hopper 21 can be sealed to block the raw materials from entering the stirring barrel 1, and when the discharging groove 33 corresponds to the bottom of the feeding hopper 21, the raw materials in the feeding hopper 21 enter the stirring barrel 1 through the discharging groove 33 and the lower hopper 23.

[0036] As Figure 3 , Figure 4As shown, the stirring assembly 4 comprises a support plate 41 fixedly installed between the two feed hoppers 21, the top of the support plate 41 is fixedly connected with a first servo motor 42, the output end of the first servo motor 42 is fixedly connected with a rotating rod 43, the bottom of the rotating rod 43 extends to the inner cavity of the stirring barrel 1 through the stirring barrel 1 and is fixedly connected with a fixed rod 44, the inside of the fixed rod 44 is provided with a barrel 45, and the outer wall of the barrel 45 is fixedly connected with stirring blades 46; the fixed rod 44 comprises a connecting portion 441 and a fixed portion 442, and the barrel 45 is fixedly installed between the connecting portion 441 and the fixed portion 442; in the embodiment of the present application, the first servo motor 42 is turned on to drive the rotating rod 43 to rotate, and the rotating rod 43 drives the fixed rod 44, the barrel 45 and the stirring blades 46 to rotate, so that the stirring blades 46 uniformly mix the raw materials.

[0037] As shown in the figure, Figure 4 The cleaning assembly 6 comprises a positioning rod 61 fixedly installed on the outer walls of the connecting portion 441 and the fixed portion 442, a moving rod 62 is slidably connected in the positioning rod 61, one end of the moving rod 62 extends to the outside through the positioning rod 61 and is fixedly connected with a scraper 63, a threaded rod 64 is threadedly connected in the moving rod 62, one end of the threaded rod 64 extends to the inner cavity of the connecting portion 441 through the connecting portion 441, and the threaded rod 64 is rotatably installed on the fixed rod 44, one end of the threaded rod 64 is fixedly connected with a first bevel gear 65, a second servo motor 68 is fixedly installed in the inner cavity of the fixed portion 442, the output end of the second servo motor 68 is fixedly connected with a drive rod 67, the top of the drive rod 67 extends through the barrel 45 and is rotatably connected with the inner wall of the connecting portion 441, and the drive rod 67 is rotatably connected with the barrel 45, the outer wall of the drive rod 67 is fixedly connected with a second bevel gear 66 at the top and the bottom, and the two ends of the second bevel gear 66 are meshed with the first bevel gear 65, in the embodiment of the present application, the second servo motor 68 is turned on to drive the drive rod 67 to rotate, the drive rod 67 drives the two second bevel gears 66 to rotate, the second bevel gears 66 drive the two first bevel gears 65 meshed on the sides to rotate, and the first bevel gears 65 drive the threaded rod 64 to rotate, so that the threaded rod 64 drives the moving rod 62 threadedly connected on one side to move outward, and the moving rod 62 drives the scraper 63 to abut against the inner wall of the stirring barrel 1, then the stirring assembly 4 drives the cleaning assembly 6 to rotate, so that the scraper 63 cleans the inner wall of the stirring barrel 1, plays the role of automatic cleaning, ensures the cleaning efficiency of the device, avoids residues on the inner wall of the stirring barrel 1, and affects the normal use of the subsequent device.

[0038] As shown in the figure, Figure 5As shown, the throwing assembly 5 comprises a connecting ring 51 fixedly installed on the outer wall of the rotating rod 43, the outer wall of the connecting ring 51 is fixedly connected with two sector blocks 52, and the two sector blocks 52 are symmetrically arranged, and the outer side of the sector block 52 is provided with a knocking mechanism; the knocking mechanism comprises a fixed cylinder 55 fixedly installed on the inner wall of the stirring barrel 1, and the fixed cylinder 55 is located below the rotating plate 54, the inner cavity of the fixed cylinder 55 is fixedly connected with a spring 56, the other end of the spring 56 is fixedly connected with a movable rod 57, the other end of the movable rod 57 extends to the outside through the fixed cylinder 55, and the bottom of one end of the movable rod 57 is fixedly connected with a contact rod 58, and the position of the contact rod 58 corresponds to the position of the sector block 52, the top of the sector block 52 is fixedly connected with a discharging protrusion 53, the upper side of the discharging protrusion 53 is provided with the rotating plate 54, and the rotating plate 54 is rotatably installed on the inner wall of the stirring barrel 1, in the embodiment of the application, the position of the rotating plate 54 corresponds to the position of the discharging hopper 23, the material falls from the feeding hopper 21 to the rotating plate 54 through the discharging hopper 23, and the connecting ring 51 is driven to rotate when the stirring assembly 4 rotates, the two sector blocks 52 and the discharging protrusion 53 are driven to rotate by the connecting ring 51, at this time, the sector block 52 can drive the contact rod 58 to move and compress the spring 56 in the fixed cylinder 55 after rotating, when the sector block 52 is no longer in contact with the contact rod 58, the movable rod 57 is driven to move towards the rotating plate 54 under the elastic force of the spring 56, and the rotating plate 54 is knocked, through the continuous rotation of the sector block 52, the operation of throwing the material multiple times is realized, and this way can ensure that the material does not accumulate after falling, thereby enhancing the mixing efficiency of the equipment and improving the use effect of the device.

[0039] The application further discloses a physical moisture-absorbing BOPP film prepared by the preparation method.

[0040] The working principle of the mixing device is as follows: raw materials are put into the feeding hopper 21, when the sliding block 31 is driven to move by starting the first telescopic cylinder 32, the feeding hopper 21 bottom is sealed when the blocking block 34 corresponds to the feeding hopper 21 bottom, so that the raw materials cannot enter the stirring barrel 1, and when the discharging groove 33 corresponds to the feeding hopper 21 bottom, the raw materials in the feeding hopper 21 enter the stirring barrel 1 through the discharging groove 33 and the discharging hopper 23.

[0041] When the first servo motor 42 is turned on, the rotating rod 43 is driven to rotate, and the rotating rod 43 drives the fixed rod 44, the barrel 45 and the stirring blade 46 to rotate. When the rotating rod 43 rotates, the connecting ring 51 is driven to rotate, and the connecting ring 51 drives the two sector blocks 52 and the discharging protrusion 53 to rotate. At this time, the sector block 52 can push the abutting rod 58 to drive the movable rod 57 to move in the fixed cylinder 55 and compress the spring 56 after the sector block 52 rotates. When the sector block 52 is no longer in contact with the abutting rod 58, the movable rod 57 is pushed to move towards the rotating plate 54 under the elastic force of the spring 56, and the rotating plate 54 is knocked. Through the continuous rotation of the sector block 52, the operation of throwing the material multiple times is realized. This way can ensure that the material does not accumulate after falling, thereby enhancing the mixing efficiency of the equipment and improving the use effect of the device. At the same time, the stirring blade 46 uniformly mixes the raw materials.

[0042] When the second servo motor 68 is turned on, the driving rod 67 is driven to rotate, and the driving rod 67 drives the two second bevel gears 66 to rotate. The second bevel gears 66 drive the two sides meshing first bevel gears 65 to rotate, and the first bevel gears 65 drive the threaded rod 64 to rotate, so that the threaded rod 64 drives the one side threaded connecting moving rod 62 to move outward. The moving rod 62 drives the scraper 63 to be attached to the inner wall of the stirring barrel 1, and then the stirring assembly 4 drives the cleaning assembly 6 to rotate, so that the scraper 63 cleans the inner wall of the stirring barrel 1, plays an automatic cleaning role, ensures the cleaning efficiency of the device, and avoids residues on the inner wall of the stirring barrel 1, which affects the normal use of the subsequent device.

[0043] In the embodiments of the present application, the circuits and electronic components involved in the present application are all prior art, and those skilled in the art can realize them without further description. The content protected by the present application does not involve the improvement of internal structure and method. It should be noted that the standard parts used in the present application can be purchased from the market, and the special-shaped parts can be ordered according to the description and drawings. The specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art. The mechanical parts and equipment adopt conventional types in the prior art, and the inventor will not describe them in detail.

[0044] Meanwhile, the contents not described in detail in the present specification belong to the prior art known to those skilled in the art.

[0045] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.

[0046] While the embodiments of the application have been shown and described herein, it is to be understood that the scope of the application, jointly pointed out in the appended claims, is not limited to the details of the embodiments shown, and that various changes can be made and equivalents employed without departing from the intended spirit and scope of the application.

Claims

1. A process for the production of a physically absorbent BOPP film, characterized in that: It comprises the following steps: S1 mixing: the raw materials are put into the mixing device, the raw materials entering the inside of the stirring barrel (1) are controlled by the feeding assembly (2) and the material control assembly (3), the raw materials transported at a constant speed are scattered by the scattering assembly (5), and the raw materials entering the stirring barrel (1) are mixed by the stirring assembly (4); the operation of scattering the materials multiple times uniformly mixes the raw materials; S2 melt extrusion: the mixed raw materials are fed into the extruder through the feeder, melted and plasticized, then extruded in the form of melt, filtered through the filter, and then sent to the die head by the metering pump to converge, and then extruded into a sheet; S3 forming: through the processes of cooling, transverse and longitudinal stretching, traction and winding, a BOPP film is obtained; The mixing device comprises a stirring barrel (1), a feeding assembly (2), a material control assembly (3), a stirring assembly (4), a scattering assembly (5), a cleaning assembly (6) and a baffle (7); the feeding assembly (2) is arranged at the top of both sides of the stirring barrel (1); the material control assembly (3) is arranged on the feeding assembly (2); the stirring assembly (4) is arranged inside the stirring barrel (1); the scattering assembly (5) is arranged inside the stirring barrel (1) and located on both sides of the stirring assembly (4); and the cleaning assembly (6) is located inside the stirring barrel (1); The material control assembly (3) comprises a sliding block (31) slidingly arranged between a feeding hopper (21) and a discharging hopper (23); the outer sides of both ends of the sliding block (31) are provided with first telescopic air cylinders (32) for moving the sliding block (31); and the inner wall of the sliding block (31) is provided with a discharging groove (33), and the inner wall of the discharging groove (33) is fixedly connected with a stop block (34); The scattering assembly (5) comprises a connecting ring (51) fixedly arranged on the outer wall of a rotating rod (43) of the stirring assembly (4); the outer wall of the connecting ring (51) is fixedly connected with two sector blocks (52) which are symmetrically arranged; the top of each sector block (52) is fixedly connected with a discharging protruding block (53); the outer side of each sector block (52) is provided with a knocking mechanism; the upper side of the discharging protruding block (53) is provided with a rotating plate (54) which is rotatably arranged on the inner wall of the stirring barrel (1); The knocking mechanism comprises a fixed cylinder (55) fixedly arranged on the inner wall of the stirring barrel (1) and located below the rotating plate (54); the inner cavity of the fixed cylinder (55) is fixedly connected with a spring (56); the other end of the spring (56) is fixedly connected with a movable rod (57); the other end of the movable rod (57) extends to the outside through the fixed cylinder (55); one end of the movable rod (57) is fixedly connected with an abutting rod (58); and the position of the abutting rod (58) corresponds to the position of the sector block (52).

2. A process for the production of a physically absorbent BOPP film according to claim 1, characterized in that: The feeding assembly (2) comprises support columns (22) fixedly installed on both sides of the top of the stirring barrel (1), the top of the support column (22) is fixedly connected with a feeding hopper (21), the lower portion of the feeding hopper (21) is provided with a lower hopper (23), and the bottom of the lower hopper (23) penetrates through the top of the stirring barrel (1) and extends into the inner cavity.

3. A process for the preparation of a physically absorbent BOPP film as claimed in claim 1, wherein: The stirring assembly (4) comprises a support plate (41) fixedly installed between the two feeding hoppers (21), the top of the support plate (41) is fixedly connected with a first servo motor (42), the output end of the first servo motor (42) is fixedly connected with a rotating rod (43), the bottom of the rotating rod (43) penetrates through the stirring barrel (1) and extends into the inner cavity and is fixedly connected with a fixed rod (44), the inner portion of the fixed rod (44) is provided with a barrel (45), and the outer wall of the barrel (45) is fixedly connected with stirring blades (46).

4. A process for the production of a physically absorbent BOPP film according to claim 3, characterized in that: The fixed rod (44) comprises a connecting portion (441) and a fixed portion (442), and the barrel (45) is fixedly installed between the connecting portion (441) and the fixed portion (442).

5. A process for the production of a physically absorbent BOPP film according to claim 4, characterized in that: The cleaning assembly (6) comprises positioning rods (61) fixedly installed on the outer walls of the connecting portion (441) and the fixed portion (442), the inner portions of the positioning rods (61) are slidably connected with moving rods (62), one end of the moving rod (62) slidably penetrates through the positioning rod (61), extends to the outside and is fixedly connected with a scraper (63), the inner portion of the moving rod (62) is screwedly connected with a threaded rod (64), one end of the threaded rod (64) penetrates through the connecting portion (441) and extends into the inner cavity of the connecting portion (441), the threaded rod (64) is rotatably installed on the fixed rod (44), one end of the threaded rod (64) is fixedly connected with a first bevel gear (65), the inner cavity of the fixed portion (442) is fixedly installed with a second servo motor (68), the output end of the second servo motor (68) is fixedly connected with a driving rod (67), the top of the driving rod (67) penetrates through the barrel (45) and is rotatably connected with the inner wall of the connecting portion (441), the driving rod (67) is rotatably connected with the barrel (45), the outer wall of the driving rod (67) is fixedly connected with second bevel gears (66) at the top and the bottom, and the two ends of the second bevel gears (66) are in meshing transmission with the first bevel gear (65).

6. A physically absorbent BOPP film, characterized by: The method is prepared according to any one of claims 1-5. The method is prepared according to any one of claims 1-5.

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