CN117181516A - Preparation method of high-barrier composite film - Google Patents

Abstract

The invention relates to the technical field of film preparation, in particular to a preparation method of a high-barrier composite film; the method comprises the following steps: s1: after the other end of the film bypasses the rubber roller, pushing the two blocking sleeves to slide along the axial direction of the rubber roller and then respectively contact with the edge of the film; s2: after pouring the coating material into a material box, controlling a first motor, a second motor and a third motor to synchronously rotate by a controller, dipping the coating material in the material box on the surface of a coating roller, coating the coating material on a film and a baffle sleeve on two sides of the film, drying the film coated with the coating material by an oven, and finally winding by a winding roller to finish the preparation process of the high-barrier composite film; according to the invention, the blocking sleeve is used for blocking and limiting the edges of the films on the rubber roller, so that the coating roller can prevent the coating material from directly contacting with the rubber roller in the coating process of the films, and meanwhile, the films with different widths can be coated, and the preparation requirements of high-blocking composite films with different specifications can be met.

Description

Preparation method of high-barrier composite film

Technical Field

The invention relates to the technical field of film preparation, in particular to a preparation method of a high-barrier composite film.

Background

The composite film is a polymer material formed by compounding two or more layers of films with different materials; PET composite film is used as a packaging film with excellent performance of the composite film and is widely applied to various industries; in order to enable the PET composite film to have better moisture and air blocking performance, a high-blocking composite film is gradually extended.

The high-barrier composite film is generally prepared by firstly preparing a coating material with high barrier property, then coating the coating material on the upper surface of the PET film by using a coating roller, and drying by hot air and other modes to finish the preparation process; the coating width formed by dipping the coating material by the existing coating roller is constant, so that the coating roller cannot be suitable for PET films with different widths in the coating process, and the preparation limitation of the existing high-barrier composite film is caused.

In view of the above, the present invention provides a method for preparing a high-barrier composite film, which solves the above technical problems.

Disclosure of Invention

In order to make up the defects of the prior art, the invention provides a preparation method of a high-barrier composite film, and the edge of the film on the rubber roller is blocked and limited by the blocking sleeve, so that the coating roller can prevent the coating material from directly contacting with the rubber roller in the coating process of the film, realize coating of films with different widths, and meet the preparation requirements of the high-barrier composite film under different specifications.

The technical scheme adopted for solving the technical problems is as follows: the preparation method of the high-barrier composite film comprises the following steps:

s1: respectively and correspondingly adding graphene nano sheets and boron nitride nano sheets into a drying regulator and an aqueous polymer solution to be uniformly dispersed to form two dispersion solutions, and uniformly mixing the two dispersion solutions to obtain a coating material;

s2: the other end of the film is unreeled by an unreeling roller in a coating machine, then bypasses a first driving roller, a rubber roller, a second driving roller, an oven and a third driving roller, is finally wound on a winding roller, and then pushes two baffles to be sleeved on the outer walls of the two ends of the rubber roller and respectively contacted with the edges of the film after sliding along the axial direction of the rubber roller;

s3: after pouring the coating material into a material box in a coating machine, controlling a first motor, a second motor and a third motor to synchronously rotate by a controller, dipping the surface of a coating roller in the material box, coating the coating material on a film and blocking sleeves on two sides of the film, drying the film coated with the coating material by an oven, and finally winding by a winding roller to finish the preparation process of the high-barrier composite film;

wherein, the coater used in S2-S3 comprises:

a frame; the cross section of the frame is U-shaped; the two inner walls of the frame are rotatably connected with an unreeling roller, a driving roller, a rubber roller, an oven and a winding roller; the unreeling roller and the reeling roller are respectively controlled by a first motor and a second motor; a controller is arranged in the frame; the controller is used for controlling the automatic operation of the coating machine; the other end of the film is unreeled by the unreeling roller, bypasses the rubber roller through the driving roller, and is wound on the reeling roller for reeling after passing through the oven;

a coating roller; the coating roller is rotationally connected between the two inner walls of the frame and is arranged close to the rubber roller; the outer wall of the frame is fixedly connected with a motor III; an output shaft of the third motor is fixedly connected with one end of the coating roller;

a blocking sleeve; the blocking sleeves are sleeved on the outer walls of the two ends of the rubber roller; the blocking sleeve is contacted with the edge of the film; the thickness of the baffle sleeve is larger than the sum of the thickness of a coating formed on the film and the thickness of the film;

a magazine; the material box is positioned below the coating roller and the rubber roller and is fixedly connected with the frame; the applicator roll is capable of contacting the coating material in the cartridge.

Preferably, a circular groove is formed in the center of the rubber roller along the axial direction; the screw is rotationally connected between the two groove walls of the circular groove; threads at two ends of the screw rod are oppositely arranged, and one end of the screw rod extends to the outside of one end of the rubber roller; the outer walls of the two ends of the rubber roller are provided with sliding grooves; the sliding groove is communicated with the round groove; the sliding groove is connected with an L-shaped rod in a sliding way; an annular groove is formed in one end, away from each other, of the retaining sleeve; the two ends of the screw rod are connected with an internal thread sleeve in a threaded manner; one end of the L-shaped rod is rotationally connected with the corresponding annular groove, and the other end of the L-shaped rod is fixedly connected with the corresponding internal thread sleeve; the upper end of the material box is fixedly connected with a scraping plate through a connecting plate; the scraping plate is contacted with the outer wall of the retaining sleeve.

Preferably, one end of the screw is fixedly connected with a round block; pits are uniformly formed on one surface, close to the rubber roller, of the round block around the center; a groove is formed in the position, corresponding to one of the pits, of one end of the rubber roller; a locking block is arranged in the groove; the groove is connected with the locking block through a first spring; one end of the locking block, which is close to the pit, is a cambered surface.

Preferably, one end of the rubber roller is rotatably connected with the frame through a rotating hole; the outer wall of one end of the rubber roller, which is positioned at the rotating hole, is provided with a movable groove; the movable groove is communicated with the groove; the movable groove is connected with the movable block in a sliding way; one end of the movable block is in transmission with the other end of the locking block through an inclined plane; the movable block is close to one end of the locking block and is provided with a second inclined plane, the other end of the locking block is provided with a first inclined plane, and the first inclined plane and the second inclined plane are in transmission.

Preferably, the outer wall of one end of each of the two baffle sleeves, which is close to each other, is sleeved with a ring sleeve; the inner diameter of the ring sleeve is matched with the outer diameter of the baffle sleeve; one end of each loop close to the other loop is fixedly connected with a loop piece; the ring piece is sleeved on the rubber roller; the inner diameter of the ring piece is matched with the outer diameter of the rubber roller; the ring piece is connected with the blocking sleeve through a second spring.

Preferably, the ring piece is in rotary sealing connection with the ring sleeve; the ring sleeve is in sealing connection with the corresponding baffle sleeve; the inner diameter of the ring piece is in sealing connection with the rubber roller; the two ring pieces are connected through an elastic rope; the elastic rope is positioned on the back of the film; the elastic rope is arranged close to the back surface of the film; the smearing position of the ring piece close to the front surface of the film is provided with a one-way air outlet hole in a penetrating way; the end face of the ring piece is provided with a unidirectional air inlet; and one-way valves are arranged in the one-way air inlet and the one-way air inlet.

Preferably, the unidirectional air inlet hole faces the back surface of the film; the unidirectional air inlet is arranged close to the outer surface of the rubber roller; the elastic rope is far away from the front smearing position of the film and is contacted with the back of the film.

Preferably, the unidirectional air inlet is arranged close to the film smearing position.

The beneficial effects of the invention are as follows:

1. according to the invention, the blocking sleeve is used for blocking and limiting the edges of the films on the rubber roller, so that the coating roller can prevent the coating material from directly contacting with the rubber roller in the coating process of the films, and meanwhile, the films with different widths can be coated, and the preparation requirements of high-blocking composite films with different specifications can be met.

2. According to the invention, after the round block drives the screw rod to rotate to a required angle or turn number, the round block stops rotating, the round block drives one pit to correspond to the groove, then the first spring extrudes the locking block to be far away from the groove bottom, one end of the locking block is propped in the corresponding pit, locking of the round block is realized, the situation that the blocking sleeve moves due to loosening of the screw rod in the rotation process of the rubber roller is avoided, and the stability of the position of the blocking sleeve in the working process is further improved.

3. According to the invention, the coating material is unevenly smeared due to the fact that the coating material is unevenly smeared due to the axial movement of the film generating rubber roller due to the air exhausted from the unidirectional air outlet holes, and the coating material at the smeared position is blown away under the air flow impact of the unidirectional air outlet holes, so that more even distribution is realized, even smearing can be realized after the axial position of the film is changed in time, and further the quality of the formed composite film is improved.

Drawings

The invention will be further described with reference to the drawings and embodiments.

FIG. 1 is a flow chart of the method of the present invention;

FIG. 2 is a perspective view of the coater of the present invention;

FIG. 3 is a cross-sectional view of the coater of the present invention;

fig. 4 is an enlarged view at a in fig. 3;

fig. 5 is an enlarged view at B in fig. 3;

FIG. 6 is a perspective view of a rubber roll and a shoe of the present invention;

FIG. 7 is a perspective view of a collar and collar of the present invention;

FIG. 8 is a cross-sectional view of a rubber roll and a shoe;

fig. 9 is an enlarged view at C in fig. 8;

fig. 10 is an enlarged view of D in fig. 8.

In the figure: the device comprises a frame 1, an unreeling roller 11, a driving roller 12, an oven 14, a reeling roller 15, a rotary hole 16, a coating roller 2, a third motor 21, a first motor 22, a second motor 23, a baffle sleeve 3, an annular groove 31, a material box 4, a connecting plate 41, a scraping plate 42, a rubber roller 5, a round groove 51, a screw 52, a sliding groove 53, an L-shaped rod 54, an internal thread sleeve 55, a groove 56, a locking block 57, a first spring 58, a movable groove 59, a movable block 5a, a round block 6, a pit 61, a ring sleeve 7, a ring piece 8, a second spring 81, an elastic rope 82, a unidirectional air outlet 83 and a unidirectional air inlet 84.

Detailed Description

The invention is further described in connection with the following detailed description in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.

As shown in fig. 1 to 10, the preparation method of the high-barrier composite film according to the invention comprises the following embodiments:

example 1:

the preparation method of the high-barrier composite film comprises the following steps:

s1: respectively and correspondingly adding graphene nano sheets and boron nitride nano sheets into a drying regulator and an aqueous polymer solution to be uniformly dispersed to form two dispersion solutions, and uniformly mixing the two dispersion solutions to obtain a coating material;

s2: the other end of the film is unreeled by an unreeling roller 11 in a coating machine, then bypasses a first driving roller 12, a rubber roller 5, a second driving roller 12, an oven 14 and a third driving roller 12, is finally wound on a winding roller 15, and then pushes two baffle sleeves 3 to be respectively contacted with the edges of the film after being slid along the axial direction of the rubber roller 5 on the outer walls of the two ends of the rubber roller 5;

s3: after pouring the coating material into a material box 4 in a coating machine, a controller controls a first motor 22, a second motor 23 and a third motor 21 to synchronously rotate, the surface of a coating roller 2 can dip the coating material in the material box 4, the coating material is smeared on a film and a baffle sleeve 3 on two sides of the film, the film smeared with the coating material is dried by an oven 14, and finally the film is wound by a winding roller 15, so that the preparation process of the high-barrier composite film is completed;

wherein, the coater used in S2-S3 comprises:

a frame 1; the cross section of the frame 1 is U-shaped; the two inner walls of the frame 1 are rotatably connected with an unreeling roller 11, a driving roller 12, a rubber roller 5, an oven 14 and a reeling roller 15; the unreeling roller 11 and the reeling roller 15 are respectively controlled by a first motor 22 and a second motor 23; a controller is arranged in the frame 1; the controller is used for controlling the automatic operation of the coating machine; the other end of the film is unreeled by the unreeling roller 11, bypasses the rubber roller 5 through the driving roller 12, and is wound on the reeling roller 15 after passing through the oven 14 to be reeled;

a coating roller 2; the coating roller 2 is rotatably connected between the two inner walls of the frame 1 and is arranged close to the rubber roller 5; the outer wall of the frame 1 is fixedly connected with a motor No. three 21; an output shaft of the third motor 21 is fixedly connected with one end of the coating roller 2;

a stop sleeve 3; the blocking sleeves 3 are sleeved on the outer walls of the two ends of the rubber roller 5; the baffle sleeve 3 is contacted with the edge of the film; the thickness of the baffle sleeve 3 is larger than the sum of the thickness of a coating formed on the film and the thickness of the film;

a magazine 4; the material box 4 is positioned below the coating roller 2 and the rubber roller 5 and is fixedly connected with the frame 1; the applicator roll 2 is capable of contacting the coating material in the cartridge 4;

when the high-barrier composite film is used, the coating material with high barrier property is generally prepared firstly, then the coating material is coated on the upper surface of the PET film by using the coating roller 2, and the preparation process can be completed by drying in a hot air mode and the like; the coating width formed by dipping the coating material by the existing coating roller 2 is constant, so that the coating roller 2 cannot be suitable for PET films with different widths in the coating process, and the preparation limitation of the existing high-barrier composite film is caused;

therefore, the staff of the invention firstly unwinds the PET film, hereinafter referred to as film, the other end of the film is wound on the winding roller 15 after being unwound by the unwinding roller 11, the first driving roller 12, the rubber roller 5, the second driving roller 12, the oven 14 and the third driving roller 12, then pushes the two blocking sleeves 3 to slide on the outer walls of the two ends of the rubber roller 5 along the axial direction of the rubber roller 5, so that the two blocking sleeves 3 respectively contact with the edge of the film after moving, note that the sum of the width of the two blocking sleeves 3 and the width of the film is larger than the width of the coating roller 2, the surface of the coating roller 2 can be made of a layer of elastic or flexible material such as sponge, after the coating material is completely prepared and poured into the material box 4, the outer wall of the rubber roller 5 is not contacted with the coating material in the material box 4, the coating roller 2 is contacted with the coating material in the material box 4, and then under the control of the controller, the first motor 22, the second motor 23 and the third motor 21 rotate, the first motor 22 controls the unreeling roller 11 to unreel, the second motor 23 controls the reeling roller 15 to roll, the third motor 21 controls the coating roller 2 to rotate, the film is transmitted to the rubber roller 5 after unreeling from the unreeling roller 11, the third motor 21 drives the coating roller 2 to rotate, the surface of the coating roller 2 dips in the material box 4 and then coats the coating material on the film and the blocking sleeves 3 on two sides of the film, the coating material is not directly coated on the rubber roller 5 due to the blocking of the blocking sleeves 3, thereby ensuring the cleanness of the rubber roller 5, avoiding printing and dyeing contact to the back surface of the film after the coating material is adhered on the rubber roller 5, further ensuring the cleanness of the back surface of the film, and under the action of the two blocking sleeves 3, the coating roller 2 can maximally coat the film, the situation that coating insufficiency is caused by the fact that the position of a film close to the edge is not coated is avoided, the film with more size and width can be coated through the blocking of the blocking sleeve 3, the film coating requirements of different widths are met while the rubber roller 5 is not polluted, the blocking sleeve 3 also achieves the purpose of limiting the film, the film is prevented from drifting and shaking in the coating process, stable coating of the film is guaranteed, after the coating roller 2 coats the coating material on the front surface of the film, the film coated with the coating material is subjected to drying treatment through the oven 14, and finally is wound by the winding roller 15, so that the preparation process of the high-barrier composite film is completed; the coating material on the baffle sleeve 3 can fall into the material box 4 under the action of gravity to realize recovery;

according to the invention, the blocking sleeve 3 is used for blocking and limiting the edge of the film on the rubber roller 5, so that the coating roller 2 can prevent the coating material from directly contacting with the rubber roller 5 in the coating process of the film, coating films with different widths is realized, and the preparation requirements of high-blocking composite films with different specifications are met.

In this embodiment, a circular groove 51 is axially formed in the center of the rubber roller 5; a screw 52 is rotatably connected between the two groove walls of the circular groove 51; the threads at the two ends of the screw 52 are oppositely arranged, and one end of the screw 52 extends to the outside of one end of the rubber roller 5; the outer walls of the two ends of the rubber roller 5 are provided with sliding grooves 53; the chute 53 is communicated with the circular groove 51; the sliding groove 53 is connected with an L-shaped rod 54 in a sliding way; an annular groove 31 is formed in one end, away from each other, of the retaining sleeve 3; the two ends of the screw rod 52 are connected with an internal thread sleeve 55 in a threaded manner; one end of the L-shaped rod 54 is rotationally connected with the corresponding annular groove 31, and the other end of the L-shaped rod is fixedly connected with the corresponding internal thread sleeve 55; the upper end of the material box 4 is fixedly connected with a scraping plate 42 through a connecting plate 41; the scraping plate 42 is contacted with the outer wall of the retaining sleeve 3;

when in use, after the film bypasses the rubber roll 5 and before coating starts, one end of the screw rod 52 is screwed first, the screw rod 52 is rotationally connected with the rubber roll 5, the rotation of the screw rod 52 drives the two inner thread sleeves 55 to approach each other, the corresponding L-shaped rods 54 are driven to slide in the corresponding sliding grooves 53 in the process of the mutual approach of the inner thread sleeves 55, meanwhile, the two L-shaped rods 54 approach each other under the rotation of the screw rod 52, one end of the L-shaped rods 54 pushes the corresponding baffle sleeves 3 to slide on the rubber roll 5, so that the two baffle sleeves 3 approach each other under pushing, until one surface of the two baffle sleeves 3 approach each other contacts with the edge of the film, then the rotation of one end of the screw rod 52 is stopped, the movement of the baffle sleeves 3 is facilitated through the rotation of the screw rod 52, the two baffle sleeves 3 are suitable for coating films with different widths under the action of the two baffle sleeves 3, the screw 52 is in threaded connection with the internal thread sleeve 55, so that the rubber roller 5 cannot cause the screw 52 to rotate in the rotating process, and the position of the baffle sleeve 3 is stable, one end of the L-shaped rod 54 is in rotating connection with the annular groove 31, so that one end of the L-shaped rod 54 cannot influence the rotation of the baffle sleeve 3 on the rubber roller 5, the friction is generated between the rubber roller 2 and the baffle sleeve 3 in the coating material smearing process of the film by the rubber roller 2, the baffle sleeve 3 rotates under the action of the friction force, the part of the coating roller, which is in contact with the baffle sleeve 3, contacts with the scraping plate 42 after the rotation of the baffle sleeve 3, the scraping plate 42 scrapes off the coating material on the baffle sleeve 3, the coating material falls into the material box 4 after scraping, the coating material is recovered, the coating material is prevented from being solidified on the baffle sleeve 3 through cleaning the surface of the baffle sleeve 3, and the part of the coating material on the surface of the baffle sleeve 3 is prevented from dripping on the rubber roller 5 after rotating, so that the pollution of the rubber roller 5 is avoided, the cleanliness of the rubber roller 5 is ensured.

Example 2, this example differs from example 1 in that:

one end of the screw 52 is fixedly connected with the round block 6; the round block 6 is uniformly provided with pits 61 around the center on one surface close to the rubber roller 5; a groove 56 is formed at one end of the rubber roller 5 and at a position corresponding to one of the pits 61; a locking block 57 is arranged in the groove 56; the groove 56 is connected with the locking block 57 through a spring 58; one end of the locking block 57 close to the pit 61 is a cambered surface;

when the novel anti-loosening lock sleeve 3 is used, a worker needs to hold the round block 6 before controlling the screw 52 to rotate, drives the screw 52 to rotate by rotating the round block 6, simultaneously drives the concave pit 61 arranged on the round block 6 to synchronously rotate, the concave pit 61 can extrude the cambered surface on one end of the locking block 57, the locking block 57 can overcome the elastic force of the first spring 58 and move close to the bottom of the groove 56 under the extrusion of the concave pit 61, after the round block 6 drives the screw 52 to rotate to a required angle or a required number of turns, the round block 6 stops rotating, the round block 6 can drive one concave pit 61 to correspond to the groove 56, then the first spring 58 can extrude the locking block 57 to be far away from the bottom of the groove 56, one end of the locking block 57 is propped against the corresponding concave pit 61, the locking of the round block 6 is realized, the situation that the screw 52 is loosened in the rotation process of the rubber roll 5 to cause the movement of the lock sleeve 3 is avoided, and the stability of the position of the lock sleeve 3 in the working process is further improved.

In this embodiment, one end of the rubber roller 5 is rotatably connected with the frame 1 through a rotation hole 16; the outer wall of one end of the rubber roller 5, which is positioned at the rotary hole 16, is provided with a movable groove 59; the movable groove 59 is communicated with the groove 56; the movable groove 59 is connected with the movable block 5a in a sliding way; one end of the movable block 5a and the other end of the locking block 57 are driven by an inclined plane; a second inclined plane is arranged at one end, close to the locking block 57, of the movable block 5a, a first inclined plane is arranged at the other end of the locking block 57, and the first inclined plane and the second inclined plane are in inclined plane transmission;

when in use, in the process that a worker holds the round block 6 to drive the screw 52 to rotate, the pit 61 on the round block 6 can squeeze one end of the locking block 57, one end of the locking block 57 can move close to the bottom of the groove 56 after being pressed, the other end of the locking block 57 can squeeze the second inclined surface on the movable block 5a through the first inclined surface, the second inclined surface can drive the movable block 5a to slide along the movable groove 59 after being pressed, the other end of the movable block 5a is propped against the rotating hole 16 under the transmission of the inclined surface, the friction force between one end of the rubber roll 5 and the frame 1 is increased, so that the round block 6 can drive the screw 52 and the rubber roll 5 to smoothly rotate relatively, and the situation that the rubber roll 5 can not smoothly move due to the synchronous rotation of the rubber roll 5 following the screw 52 is avoided; after the round block 6 drives the screw rod 52 to a certain angle or turns, one end of the locking block 57 is propped into the corresponding pit 61 under the action of the first spring 58, so that the extrusion of the locking block 57 to the movable block 5a is relieved, the friction force between the rubber roll 5 and the rotary hole 16 is reduced, and the rubber roll 5 in operation is ensured to stably rotate in the rotary hole 16.

Embodiment 3, this embodiment differs from embodiment 1 in that:

the outer wall of one end, close to each other, of the two baffle sleeves 3 is sleeved with a ring sleeve 7; the inner diameter of the ring sleeve 7 is matched with the outer diameter of the baffle sleeve 3; one ends of the two ring sleeves 7, which are close to each other, are fixedly connected with a ring piece 8; the ring piece 8 is sleeved on the rubber roller 5; the inner diameter of the ring piece 8 is matched with the outer diameter of the rubber roller 5; the ring piece 8 is connected with the retaining sleeve 3 through a second spring 81;

when the film is used, in the axial movement process of the rubber roller 5, which occurs in the transmission process of the rubber roller 5, the film can extrude one of the ring sheets 8, one of the ring sheets 8 can extrude the corresponding second spring 81 in the film extrusion process and drive the corresponding ring sleeve 7 to move on the baffle sleeve 3, the other ring sheet 8 always abuts against the edge of the film under the action of the second spring 81 and drives the corresponding ring sleeve 7 to move, the setting of the second spring 81 and the ring sheet 8 is matched, so that the film still abuts against the film in the axial movement process of the rubber roller 5, the ring sheet 8 can also move along with the ring sheet 8 to shield the corresponding outer wall of the coating roller 2, and the film is effectively ensured to realize the unidirectional coating process while the pollution of the rubber roller 5 is avoided.

In this embodiment, the ring piece 8 is rotationally and hermetically connected with the ring sleeve 7; the ring sleeve 7 is in sealing connection with the corresponding baffle sleeve 3; the inner diameter of the ring piece 8 is in sealing connection with the rubber roller 5; the two ring pieces 8 are connected through an elastic rope 82; the elastic cord 82 is positioned on the back of the film; the elastic rope 82 is arranged close to the back surface of the film; the smearing position of the ring piece 8 close to the front surface of the film is provided with a one-way air outlet hole 83 in a penetrating way; the end face of the ring piece 8 is provided with a one-way air inlet 84; the one-way air inlet hole 84 and the one-way air inlet hole 84 are internally provided with one-way valves;

when the movable type rubber roller is used, in the process that the film on the rubber roller 5 is subjected to position change due to shaking in the axial direction of the rubber roller 5, the edge of the film can squeeze the corresponding ring piece 8, and the space between the ring piece 8 and the corresponding baffle sleeve 3 is called a movable cavity; the movable cavity is sealed, the ring piece 8 can extrude the space in the movable cavity after being extruded by the edge of the film, the space in the movable cavity can be reduced in the extrusion process, thereby the gas pressure in the movable cavity is increased, the gas in the movable cavity can be discharged along the one-way air outlet holes 83, the one-way air outlet holes 83 are corresponding to the film coating positions, the gas discharged from the one-way air outlet holes 83 can impact the coating positions, the film generates uneven coating materials due to the axial movement of the rubber roller 5, the coating materials at the coating positions are blown away under the impact of the air flow of the one-way air outlet holes 83, even coating can be realized after the axial position change of the film is timely realized, the quality of the composite film after being formed is further improved, the No. spring 81 plays a role in resetting the ring piece 8, and the external gas enters the movable cavity along the one-way air inlet holes 84 to realize gas supplement.

In this embodiment, the unidirectional air intake holes 84 are oriented toward the back of the film; the unidirectional air inlet holes 84 are arranged close to the outer surface of the rubber roller 5; the elastic cord 82 is far away from the front smearing position of the film and is contacted with the back of the film;

when the movable cavity is used, in the resetting process of the movable ring 8 driven by the second spring 81, the space in the movable cavity is enlarged, negative pressure is formed when the space in the movable cavity is enlarged, so that gas around the unidirectional air inlet holes 84 can be sucked into the movable cavity under the negative pressure, as the unidirectional air inlet holes 84 are close to the outer wall of the rubber roller 5, the unidirectional air inlet holes 84 can suck coating materials remained or attached on the surface of the rubber roller 5 into the movable cavity, the coating materials are prevented from remaining on the rubber roller 5, the coating materials in the movable cavity can be discharged along the unidirectional air outlet holes 83 along with the space reduction process of the movable cavity, the smearing position is supplemented, and in order to enable the coating materials remained in the movable cavity to be discharged quickly, the unidirectional air outlet holes can be formed through the end face of the ring 8, and are close to the material box 4, so that the unidirectional air outlet holes can discharge the coating materials in the movable cavity quickly, and the retention time of the coating materials in the movable cavity is shortened; the elastic rope 82 mainly plays a role in limiting the ring piece 8, under the blocking of the back surface of the film, the ring piece 8 is prevented from rotating along with the rubber roller 5, the positions of the unidirectional air outlet holes 83 and the unidirectional air inlets are guaranteed to be constant, and if the positions of the unidirectional air outlet holes 83 and the unidirectional air inlets are also adaptively changed and adjusted under the loose state of the film, more importantly, the positions of the unidirectional air outlet holes 83 and the unidirectional air inlets on the two ring pieces 8 are guaranteed to be corresponding.

In this embodiment, the one-way air inlet 84 is disposed adjacent to the film application location; during the use, in the process that the space of movable cavity becomes big, the movable cavity produces the negative pressure, and the negative pressure of one-way inlet port 84 surrounding gas is inhaled movable cavity, because one-way inlet port 84 is close to film and paints the position setting for the edge of film is laminated more with rubber roll 5 under the negative pressure, avoids the film edge to make the coating material leakage along the gap of rubber roll 5 after rubber roll 5 axial change, has also guaranteed simultaneously that the film is laminated more even more with rubber roll 5, is that coating roll 2 better paints the coating material.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in fig. 1, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the scope of the present invention, and furthermore, the terms "first", "second", "third", etc. are merely used for distinguishing the description, and should not be construed as indicating or implying relative importance.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. A preparation method of a high-barrier composite film is characterized by comprising the following steps: the method comprises the following steps:

s1: respectively and correspondingly adding graphene nano sheets and boron nitride nano sheets into a drying regulator and an aqueous polymer solution to be uniformly dispersed to form two dispersion solutions, and uniformly mixing the two dispersion solutions to obtain a coating material;

s2: the other end of the film is unreeled by an unreeling roller (11) in a coating machine, then bypasses a first driving roller (12), a rubber roller (5), a second driving roller (12), an oven (14) and a third driving roller (12), is finally wound on a winding roller (15), and then pushes two retaining sleeves (3) to contact with the edges of the film respectively after sliding along the axial direction of the rubber roller (5) on the outer walls of the two ends of the rubber roller (5);

s3: after pouring the coating material into a material box (4) in a coating machine, a controller controls a first motor (22), a second motor (23) and a third motor (21) to synchronously rotate, the surface of a coating roller (2) can dip the coating material in the material box (4), the coating material is smeared on a film and a retaining sleeve (3) on two sides of the film, the film smeared with the coating material is dried by an oven (14), and finally the film is wound by a winding roller (15), so that the preparation process of the high-barrier composite film is finished;

wherein, the coater used in S2-S3 comprises:

a frame (1); the cross section of the frame (1) is U-shaped; the two inner walls of the frame (1) are rotatably connected with an unreeling roller (11), a driving roller (12), a rubber roller (5), an oven (14) and a reeling roller (15); a controller is arranged in the frame (1); the controller is used for controlling the automatic operation of the coating machine; the other end of the film is unreeled by the unreeling roller (11), bypasses the rubber roller (5) through the driving roller (12), and is wound on the reeling roller (15) for reeling after passing through the oven (14);

a coating roller (2); the coating roller (2) is rotationally connected between the two inner walls of the frame (1) and is arranged close to the rubber roller (5); the outer wall of the frame (1) is fixedly connected with a third motor (21); an output shaft of the third motor (21) is fixedly connected with one end of the coating roller (2);

a retaining sleeve (3); the blocking sleeves (3) are sleeved on the outer walls of the two ends of the rubber roller (5); the retaining sleeve (3) is contacted with the edge of the film;

a magazine (4); the material box (4) is positioned below the coating roller (2) and the rubber roller (5) and is fixedly connected with the frame (1); the applicator roll (2) is capable of contacting the coating material in the cartridge (4).

2. The method for preparing the high-barrier composite film according to claim 1, wherein the method comprises the following steps: a circular groove (51) is formed in the center of the inside of the rubber roller (5) along the axial direction; a screw (52) is rotatably connected between the two groove walls of the circular groove (51); threads at two ends of the screw rod (52) are oppositely arranged, and one end of the screw rod (52) extends to the outside of one end of the rubber roller (5); the outer walls of the two ends of the rubber roller (5) are provided with sliding grooves (53); the sliding groove (53) is communicated with the round groove (51); the sliding groove (53) is connected with an L-shaped rod (54) in a sliding way; an annular groove (31) is formed at one end, away from each other, of the baffle sleeve (3); two ends of the screw rod (52) are connected with an internal thread sleeve (55) in a threaded manner; one end of the L-shaped rod (54) is rotationally connected with the corresponding annular groove (31), and the other end of the L-shaped rod is fixedly connected with the corresponding internal thread sleeve (55); the upper end of the material box (4) is fixedly connected with a scraping plate (42) through a connecting plate (41); the scraping plate (42) is in contact with the outer wall of the retaining sleeve (3).

3. The method for preparing the high-barrier composite film according to claim 2, wherein the method comprises the following steps: one end of the screw (52) is fixedly connected with the round block (6); the round block (6) is uniformly provided with pits (61) around the center on one surface close to the rubber roller (5); a groove (56) is formed in the position, corresponding to one of the pits (61), of one end of the rubber roller (5); a locking block (57) is arranged in the groove (56); the groove (56) is connected with the locking block (57) through a first spring (58); one end of the locking block (57) close to the pit (61) is a cambered surface.

4. A method for preparing a high barrier composite film according to claim 3, wherein: one end of the rubber roller (5) is rotationally connected with the frame (1) through a rotating hole (16); the outer wall of one end of the rubber roller (5) positioned at the rotary hole (16) is provided with a movable groove (59); the movable groove (59) is communicated with the groove (56); the movable groove (59) is connected with the movable block (5 a) in a sliding way; one end of the movable block (5 a) is in inclined plane transmission with the other end of the locking block (57).

5. The method for preparing the high-barrier composite film according to claim 2, wherein the method comprises the following steps: the outer wall of one end, close to each other, of the two baffle sleeves (3) is sleeved with a ring sleeve (7); the inner diameter of the ring sleeve (7) is matched with the outer diameter of the baffle sleeve (3); one end of each loop (7) close to each other is fixedly connected with a loop piece (8); the ring piece (8) is sleeved on the rubber roller (5); the inner diameter of the ring piece (8) is matched with the outer diameter of the rubber roller (5); the ring piece (8) is connected with the retaining sleeve (3) through a second spring (81).

6. The method for preparing the high-barrier composite film according to claim 5, wherein the method comprises the following steps: the ring piece (8) is in rotary sealing connection with the ring sleeve (7); the ring sleeve (7) is in sealing connection with the corresponding baffle sleeve (3); the inner diameter of the ring piece (8) is in sealing connection with the rubber roller (5); the two ring pieces (8) are connected through an elastic rope (82); the elastic rope (82) is positioned on the back surface of the film; a unidirectional air outlet hole (83) is formed in the smearing position of the ring piece (8) close to the front surface of the film in a penetrating way; the end face of the ring piece (8) is provided with a unidirectional air inlet hole (84).

7. The method for preparing the high-barrier composite film according to claim 6, wherein the method comprises the following steps: the unidirectional air intake holes (84) are oriented towards the back of the film; the unidirectional air inlet holes (84) are arranged close to the outer surface of the rubber roller (5); the elastic cord (82) is away from the front application location of the film and is in contact with the back of the film.

8. The method for preparing the high-barrier composite film according to claim 7, wherein the method comprises the following steps: the unidirectional air intake (84) is disposed proximate the film application location.