Packaging film functional coating uniform coating device capable of improving gas barrier property

Abstract

The invention relates to the technical field of film coating, in particular to a packaging film functional coating uniform coating device capable of improving gas barrier performance, which comprises a processing table and a fixing plate fixed on the processing table, a storage tank and a buffer pipe are fixed on the fixing plate, the storage tank is connected with a conveying pipe communicated with the buffer pipe, and the conveying pipe is connected with the processing table. The buffer pipe is connected with a coating head; the buffering pressure stabilizing assembly is arranged in the buffering pipe and used for adjusting the pressure intensity in the buffering pipe; the conduction assembly is arranged on the coating head, and the coating head is further provided with a slicking coating assembly used for slicking coating; the deflection material guide mechanism is arranged on the coating head, the deflection material guide mechanism comprises two material guide plates which are symmetrically arranged, a lateral traction assembly used for laterally supporting a film is arranged on the fixed plate, and coating accumulated on the two sides of the coating head is subjected to backflow guide through the material guide plates so as to prevent the problem of uneven distribution of the coating.

Description

Technical Field

[0001] The present invention relates to the technical field of thin film coating, and particularly to a uniform coating device for a functional coating of a packaging film with improved gas barrier performance. Background Art

[0002] The functional coating of the packaging film endows the film with additional functions and characteristics by coating a specific functional coating on the film surface to meet the requirements of different application scenarios.

[0003] As one of the important processes of coating, coating is mainly carried out by several coating methods such as microgravure roll coating, slot die coating, and knife coating. In terms of knife coating, it has the advantages of simple operation, convenient adjustment, uniform coating, and flat coating surface.

[0004] In the knife coating process, the coating used usually has thixotropy, which is a fluid with high viscosity and low fluidity. During the coating process, the edge area of the film is prone to stress concentration due to the fluctuation of the tension gradient, and due to the action of fluid inertia and adhesiveness, the problem of coating accumulation is likely to occur, which in turn leads to uneven coating pressure and thickened coating at the film edge. Summary of the Invention

[0005] The purpose of the present invention is to provide a uniform coating device for a functional coating of a packaging film with improved gas barrier performance to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A uniform coating device for a functional coating of a packaging film with improved gas barrier performance, comprising: a processing table, and a fixing plate fixed on the processing table, a storage tank and a buffer pipe are fixed on the fixing plate, a conveying pipe connected to the buffer pipe is connected to the storage tank, and a coating head is connected to the buffer pipe; further comprising: a buffer and pressure stabilizing assembly arranged in the buffer pipe for adjusting the pressure in the buffer pipe; a conduction assembly arranged on the coating head for adjusting the conduction state of the coating head, and a scraping and coating assembly for scraping the coating flat is also arranged on the coating head; a yaw guiding mechanism is arranged on the coating head, the yaw guiding mechanism includes two symmetrically arranged guiding plates, and a lateral traction assembly for laterally supporting the film is arranged on the fixing plate, and the lateral traction assembly can control the guiding plates to make reciprocating yaw movements through the yaw guiding mechanism.

[0007] As a further solution of the present invention: The lateral traction assembly includes rotating rods rotatably installed on the fixing plate and arranged symmetrically, a lateral support roller for laterally spreading the film is fixed on the rotating rod, and an eccentric wheel is also fixed on the rotating rod.

[0008] As a further solution of the present invention: the deflection material guide mechanism includes a receiving plate fixed on the coating head, and a support column for adjusting the deflection angle of the material guide plate is rotatably mounted on the receiving plate; it also includes a follower component and a guide component that cooperate with the eccentric wheel and control the support column to perform reciprocating variable speed rotation.

[0009] As a further solution of the present invention: the follower assembly includes a movable sleeve that slides axially along the support column, a movable plate is fixed on the movable sleeve, and a limit column that cooperates with the eccentric wheel is fixed at the end of the movable plate; it also includes a variable pitch spiral groove opened on the circumferential outer wall of the support column, and a limit block that slides and engages with the variable pitch spiral groove is fixed on the inner wall of the movable sleeve.

[0010] As a further solution of the present invention: the guide assembly includes a guide column fixed on the movable plate and passing through the receiving plate, and a second spring is sleeved on the guide column, and two ends of the second spring are respectively in contact with the movable plate and the receiving plate.

[0011] As a further solution of the present invention: the buffer and voltage stabilizing assembly includes a support rod fixed in the buffer tube, and a symmetrically arranged limiting ring is fixed on the support rod; it also includes a buffer disk that slides axially along the support rod, and the buffer disk is in abutment with the limiting ring. A first spring is sleeved on the support rod, and two ends of the first spring are respectively in abutment with the buffer disk and the buffer tube.

[0012] As a further solution of the present invention: the conduction component includes a discharge trough formed at one end of the coating head away from the buffer tube, and symmetrically arranged slide grooves are provided on both sides of the coating head.

[0013] As a further solution of the present invention: the conduction component also includes a sealing plate that slides along the slide groove track and cooperates with the discharge chute, a cylinder is fixed on the buffer tube, and the telescopic end of the cylinder is hinged with a connecting rod that is symmetrically arranged and hinged to the sealing plate.

[0014] As a further solution of the present invention: the coating and scraping assembly includes an adjusting screw that is threadedly connected to the receiving plate and is symmetrically arranged, and a scraper is connected to the end of the adjusting screw.

[0015] As a further solution of the present invention: a support plate for carrying the film is fixed on the fixed plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This application can eliminate the stress concentration generated at the edge position during the movement of the film and the problem of uneven coating caused by the accumulation of the coating material by providing a lateral tensile force to the film and dispersing and spreading the accumulated material. Specifically, when the coating material is transported into the buffer pipe, under the action of the buffer and pressure stabilizing component, after the pressure of the coating material reaches the set value, the conducting component will control the coating head to conduct, so as to ensure uniform discharging along the entire length direction of the discharge chute. And through the lateral traction component, a lateral tensile force can be provided to the film to eliminate the stress concentration at the edge position of the film. At the same time, the lateral traction component will also drive the swing guiding mechanism to move, so as to disperse and spread the accumulated material by controlling the reciprocating swing of the guiding plate, thereby ensuring the uniformity of coating.

[0017] Through the buffer and pressure stabilizing component, the pressure generated by the coating material on the buffer disk can be detected in real time. When the pressure reaches the preset value, the discharge chute will open. Under the action of the pressure, the coating material will be evenly discharged through the discharge chute, ensuring that when the coating material is released onto the film, it can be evenly distributed in the area to be coated on the film, so as to ensure uniform pressure during the coating process; through the swing guiding mechanism, the variable-speed swing movement of the guiding plate can be accurately controlled, which can not only effectively break the agglomeration phenomenon of the accumulated coating material, realize the stable guiding and movement of the coating material, and avoid adverse effects on the coating effect of the film, but also ensure that the coating material returns to the coating area for full utilization, prevent the problem of hardening caused by the long-term accumulation of the coating material without timely coating, thereby improving the efficiency and quality of the coating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Structural schematic diagram of an embodiment of a device for uniformly coating a functional coating on a packaging film for improving gas barrier performance; Figure 2 Structural schematic diagram of another angle in an embodiment of a device for uniformly coating a functional coating on a packaging film for improving gas barrier performance; Figure 3 Structural schematic diagram of a coating scraping and leveling component, a lateral traction component, a storage tank, and a buffer pipe in an embodiment of a device for uniformly coating a functional coating on a packaging film for improving gas barrier performance; Figure 4 Schematic diagram of the connection relationship of a lateral traction component, a swing guiding mechanism, and a partial conducting component in an embodiment of a device for uniformly coating a functional coating on a packaging film for improving gas barrier performance; Figure 5 For Figure 4 Structural enlarged schematic diagram at position A in Figure 6 Half-sectional structural schematic diagram of a buffer pipe in an embodiment of a device for uniformly coating a functional coating on a packaging film for improving gas barrier performance; Figure 7 Schematic structural diagram of a conduction component and a partial swing material guiding mechanism in an embodiment of a packaging film functional coating uniform coating device for improving gas barrier performance; Figure 8 Exploded structural diagram of a conduction component and a coating head in an embodiment of a packaging film functional coating uniform coating device for improving gas barrier performance; Figure 9 Schematic structural diagram of a swing material guiding mechanism and a lateral traction component in an embodiment of a packaging film functional coating uniform coating device for improving gas barrier performance; Figure 10 Exploded structural diagram of a swing material guiding mechanism in an embodiment of a packaging film functional coating uniform coating device for improving gas barrier performance.

[0019] In the figure: 1, processing table; 2, conveying roller; 3, fixing plate; 4, support plate; 5, storage tank; 6, conveying pipe; 7, buffer pipe; 8, coating head; 801, discharge chute; 802, receiving plate; 9, support rod; 901, limiting ring; 10, buffer disc; 11, first spring; 12, cylinder; 13, connecting rod; 14, blocking plate; 15, baffle; 16, adjusting screw; 17, scraper; 18, rotating rod; 19, lateral support roller; 20, eccentric wheel; 21, support column; 2101, variable pitch spiral groove; 22, material guiding plate; 23, movable sleeve; 2301, limiting block; 24, movable plate; 25, limiting column; 26, guiding column; 27, second spring. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] In addition, an element in the present invention is referred to as being "fixed to" or "disposed on" another element, and it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0022] Please refer to Figures 1 to 10, in the embodiments of the present invention, a device for uniformly coating a functional coating of a packaging film with improved gas barrier performance includes: a processing table 1, and a fixing plate 3 fixed on the processing table 1. A storage tank 5 and a buffer pipe 7 are fixed on the fixing plate 3. A conveying pipe 6 communicating with the buffer pipe 7 is connected to the storage tank 5, and a coating head 8 is connected to the buffer pipe 7; it further includes: a buffer and pressure stabilizing component arranged in the buffer pipe 7 for adjusting the pressure in the buffer pipe 7; a conducting component arranged on the coating head 8 for adjusting the conducting state of the coating head 8, and a scraping and coating component for scraping the coating is also arranged on the coating head 8; a yawing and guiding mechanism is arranged on the coating head 8. The yawing and guiding mechanism includes two symmetrically arranged guiding plates 22. A lateral traction component for laterally supporting the film is arranged on the fixing plate 3, and the lateral traction component can control the guiding plates 22 to perform a reciprocating yawing action through the yawing and guiding mechanism.

[0023] Specifically, a conveying roller 2 is installed on the processing table 1 for guiding the film to move along the required coating direction. Baffles 15 are fixed on both sides of the coating head 8, and the outer arc wall of the rotation center of the baffle 15 abuts against the guiding plate 22. Under the action of the baffle 15 and the guiding plate 22, the coating conveyed by the coating head 8 is restricted within the coating area. When the film needs to be coated, the coating in the storage tank 5 can be pumped through the conveying pipe 6 to the buffer pipe 7 and the coating head 8. The coating in the buffer pipe 7 will act on the buffer and pressure stabilizing component. When the buffer and pressure stabilizing component reaches the required pressure, it means that the coating is evenly distributed in the buffer pipe 7 and the coating head 8. At this time, the conducting component works to make the coating head 8 conduct, and the coating is conveyed onto the film surface. At this time, the conveying roller 2 works and controls the film to move smoothly, and the film will drive the coating to move synchronously. When the coating passes through the scraping and coating component, under the action of the scraping and coating component, the coating is scraped and coated to make the coating evenly coated on the film surface.

[0024] If the edge of the film is affected by the surface tension gradient, resulting in stress concentration in the edge area, or due to the inertia of the coating fluid, etc., causing the coating to accumulate on both sides of the coating head 8, under the action of the lateral traction assembly, a lateral pulling force is provided to both sides of the film to eliminate the tension influence generated when the conveying roller 2 controls the movement of the film. At the same time, the lateral traction assembly will also drive the yaw guiding mechanism to move, so as to control the two guiding plates 22 to reciprocate and yaw in the direction of approaching or moving away from each other, and maintain a relatively small speed at the initial stage of yaw to smoothly guide the accumulated coating, and gradually increase the yaw speed in the later stage of yaw to convey the accumulated coating towards the middle direction of the coating head 8 through the thrust. In the subsequent coating process, the coating conveyed to the middle position will be automatically spread again under the action of its own flow and the scraping coating assembly, so as to achieve the problem of uneven thickness on both sides of the film caused by the tension change generated during the movement of the film by providing the lateral pulling force of the film, and at the same time, control the backflow of the accumulated coating to eliminate the problems of increased coating pressure and increased coating thickness on both sides of the film caused by the coating accumulation, and prevent the problem of coating hardening caused by the coating accumulation not being coated for a long time, ensuring the smooth progress of coating and the improvement of coating quality.

[0025] Please refer to Figures 1 - 3 、 Figure 6 As shown in FIGS.

[0026] Please refer to Figure 4 、 Figures 6 - 8 As shown in FIGS.

[0027] It should be noted that before coating the thin film, the coating material can be added into the storage tank 5. In the initial state, the first spring 11 is in a slightly compressed state, so that the buffer plate 10 abuts against the limit ring 901. At this time, the bearing space in the buffer tube 7 is the smallest. Under the action of the air cylinder 12, the two sealing plates 14 are controlled to be in a state of abutting against each other through the connecting rod 13 to block the discharge slot 801. When coating is required, the coating material in the storage tank 5 can be pumped through the conveying pipe 6 into the buffer tube 7. The coating material in the buffer tube 7 will flow into the coating head 8. As the coating material gradually increases, under the action of the pressure, the two buffer plates 10 are pushed to move away from each other and compress the first spring 11. When the pressure in the buffer tube 7 reaches the required value, the air cylinder 12 works, and drives the two sealing plates 14 to move along the length direction of the chute and move away from each other through the connecting rod 13, so that the discharge slot 801 is opened. At this time, the coating material in the coating head 8 will be discharged through the discharge slot 801 and fall on the surface of the thin film. Under the pulling force provided by the conveying roller 2, the thin film is controlled to move from the position of the coating head 8 towards the coating and leveling assembly, and under the action of the coating and leveling assembly, the coating material is evenly coated on the surface of the thin film.

[0028] Preferably, a pressure sensor is installed on the buffer plate 10 to detect the pressure generated by the coating material on the buffer plate 10 in real time. When the pressure reaches the preset value, the discharge slot 801 will be opened. Under the action of the pressure, the coating material will be evenly discharged through the discharge slot 801, ensuring that when the coating material is released onto the thin film, it can be evenly distributed in the area to be coated on the thin film to ensure uniform pressure during the coating process. Specifically, the directions of the two coating materials entering the buffer tube 7 are perpendicular to the direction in which the coating material finally discharges from the coating head 8. This design effectively avoids the problem of discharge pressure fluctuation that may be caused when the coating material enters the buffer tube 7, thus ensuring the stability of the coating process and the uniformity of the coating material distribution.

[0029] Please refer to Figure 3 , the coating and leveling assembly includes adjusting screws 16 that are symmetrically arranged and threadedly connected to the receiving plate 802. The end of the adjusting screw 16 is connected to a scraper 17, and a support plate 4 for carrying the thin film is fixed on the fixing plate 3.

[0030] Specifically, the size of the squeegee 17 is equal to the distance between the two baffles 15, so that the coating size affected by the squeegee 17 is equivalent to the required coating size. The squeegee 17 is arranged at the rear end of the coating head 8. When the coating head 8 transports the coating to the surface of the film, under the action of the conveying roller 2, the film moves smoothly. When the coating passes through the squeegee 17, the squeegee 17 can block the excess coating from passing through and evenly coat the required coating on the surface of the film. At the same time, under the action of the support plate 4, an effective supporting force for the film can be provided to prevent the film from deforming due to pressure during the coating process, resulting in uneven coating of the film. If it is necessary to adjust the coating thickness, the adjusting screw 16 can be controlled to rotate to adjust the distance between the squeegee 17 and the surface of the film, thereby changing the coating thickness.

[0031] Please refer to Figures 1 - 4 、 Figure 9 The lateral traction assembly includes rotating rods 18 that are rotatably mounted on the fixing plate 3 and are symmetrically arranged. A lateral support roller 19 for laterally flattening the film is fixed on the rotating rod 18, and an eccentric wheel 20 is also fixed on the rotating rod 18.

[0032] Furthermore, the lateral support rollers 19 are arranged on both sides of the film, are in contact with the surface of the film, and have a certain inclination angle with the advancing direction of the film. When the conveying roller 2 pulls the film to move, the film is easily affected by the surface tension gradient, resulting in stress concentration in the edge area, and further resulting in shrinkage or thickening of the edge area of the film. Therefore, the rotating rod 18 can be controlled to rotate, thereby driving the lateral support roller 19 to rotate. Under the action of the lateral support roller 19, a pulling force is provided for the edge of the film to move away from both sides of the film, thereby preventing the problem of uneven coating thickness at the edge of the film due to tension changes. Among them, the lateral pulling force provided by the lateral support roller 19 does not exceed the elastic deformation force of the film itself, so as to ensure that the edge of the film will not be deformed due to the pulling force. The rotation of the rotating rod 18 can be controlled by a motor, which is an application of the prior art and will not be elaborated in this application.

[0033] Please refer to Figures 1 - 7 、 Figure 9 、 Figure 10, the yaw feeding mechanism includes a receiving plate 802 fixed on the coating head 8. A support column 21 is rotatably installed on the receiving plate 802. A feeding plate 22 is fixed to the lower end of the support column 21. The support column 21 is used to adjust the yaw angle of the feeding plate 22. It further includes a follower assembly and a guiding assembly that cooperate with the eccentric wheel 20 and control the reciprocating variable-speed rotation of the support column 21. The follower assembly includes a movable sleeve 23 that axially slides along the support column 21. A movable plate 24 is fixed on the movable sleeve 23. A limit column 25 that abuts and cooperates with the eccentric wheel 20 is fixed to the end of the movable plate 24. It further includes a variable pitch spiral groove 2101 formed on the circumferential outer wall of the support column 21. A limit block 2301 that is slidably fitted with the variable pitch spiral groove 2101 is fixed to the inner wall of the movable sleeve 23. The guiding assembly includes a guiding column 26 fixed on the movable plate 24 and passing through the receiving plate 802. A second spring 27 is sleeved on the guiding column 26. The two ends of the second spring 27 respectively abut against the movable plate 24 and the receiving plate 802.

[0034] Furthermore, the eccentric wheel 20 is eccentrically arranged, and the variable pitch spiral groove 2101 is spirally arranged, with one end facing the material guiding plate 22 as the starting point, and its pitch gradually decreases. In the initial state, the second spring 27 is in a compressed state, causing the movable plate 24 to tend to move away from the receiving plate 802. Under the action of the movable plate 24, the limit post 25 is in contact with the short axis of the eccentric wheel 20. At this time, the distance between the movable sleeve 23 and the receiving plate 802 is the largest, causing the limit block 2301 to be located at the end of the stroke on the side of the variable pitch spiral groove 2101 facing the material guiding plate 22, and the yaw angles of the two material guiding plates 22 are the smallest. Since when the film moves, a tension gradient will be generated at the edge position, causing stress concentration in the edge area, which affects the flow of the coating material, resulting in the coating material gradually accumulating on both sides of the coating head 8. The accumulation of the coating material will further affect the coating uniformity, thereby generating tension fluctuations on the film surface. Therefore, when the rotating rod 18 rotates, it can provide a lateral pulling force to the film through the lateral support roller 19 to eliminate the influence of the tension on the film. At the same time, the rotating rod 18 will also drive the eccentric wheel 20 to rotate. Under the action of the eccentric wheel 20, the limit post 25 gradually moves towards the receiving plate 802, thereby driving the movable plate 24 to move. The movable plate 24 will compress the second spring 27, and under the action of the guiding post 26, it is ensured that the movable plate 24 will not shift during movement to ensure that the limit post 25 is always in contact with the eccentric wheel 20. The movable plate 24 will also drive the movable sleeve 23 to move, causing the limit block 2301 to slide along the track of the variable pitch spiral groove 2101. Under the action of the limit block 2301 and the variable pitch spiral groove 2101, the support post 21 is controlled to rotate, thereby controlling the two material guiding plates 22 to yaw towards each other to push the accumulated coating material towards the central area of the coating. When the long axis of the eccentric wheel 20 is in contact with the limit post 25, it means that the movable plate 24 has moved to the end of the stroke towards the receiving plate 802, and the limit block 2301 has moved to the other end of the variable pitch spiral groove 2101, causing the yaw angle of the material guiding plate 22 to reach the maximum, and the compression amount of the second spring 27 also reaches the maximum. At this time, when the eccentric wheel 20 continues to rotate, the second spring 27 elastically releases, causing the movable plate 24 to move towards the initial position. At the same time, under the action of the limit block 2301 and the variable pitch spiral groove 2101, the material guiding plate 22 is controlled to yaw towards the initial position until the material guiding plate 22 returns to the initial position. By repeating the above steps, the treatment and utilization of the accumulated coating material are realized.

[0035] Preferably, in the coating process, the coating material used usually has thixotropy and is a fluid with relatively high viscosity and low fluidity. When the coating material spreads and flows through contact with the baffle 15 in the coating area, its flow rate will decrease due to the obstruction of the baffle 15 and gradually accumulate at the position of the baffle 15 under the action of its own viscosity.

[0036] In order to effectively reduce the accumulation of the coating material, the present application assists in the leveling of the accumulated material by controlling the yaw mode of the material guiding plate 22. Specifically, when the limit block 2301 slides along the trajectory of the variable pitch spiral groove 2101, due to the pitch of the variable pitch spiral groove 2101 being designed in a gradually decreasing form, under the combined action of the limit block 2301 and the variable pitch spiral groove 2101, the initial rotation speed of the support column 21 is in a relatively slow state, and thus the yaw speed of the material guiding plate 22 is relatively small. At this time, the material guiding plate 22 can provide a stable thrust to the accumulated coating material, thereby effectively breaking the cohesion between the coating particles and the adhesion between the coating and the baffle, and guiding the coating to move smoothly towards the coating central area.

[0037] As the support column 21 continues to rotate, the yaw speed of the material guiding plate 22 gradually increases. Correspondingly, the thrust provided to the accumulated coating material also increases. Under the combined action of the flow characteristics and inertial force of the coating material itself, the accumulated coating material can smoothly return to the required coating position. By precisely controlling the variable-speed yaw motion of the material guiding plate 22, it is possible to effectively break the agglomeration phenomenon of the accumulated coating material, achieve the stable guiding and movement of the coating material, and avoid having an adverse impact on the coating effect of the film; and it can also ensure that the coating material returns to the coating area for full utilization, preventing the problem of hardening caused by the long-term accumulation of the coating material without being coated in a timely manner, thereby improving the efficiency and quality of the coating process.

[0038] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0039] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A packaging film functional coating uniformly coating device for improving gas barrier properties, comprising: A processing table, and a fixed plate fixed on the processing table, a storage tank and a buffer tube are fixed on the fixed plate, a delivery tube connected to the storage tank is connected to the buffer tube, and a coating head is connected to the buffer tube; it is characterized in that it also includes: a buffer voltage stabilizing component, which is arranged in the buffer tube and is used to adjust the pressure in the buffer tube; a conduction component, which is arranged on the coating head and is used to adjust the conduction state of the coating head, and the coating head is also provided with a scraping coating component for scraping the paint; a swing material guide mechanism, which is arranged on the coating head, the swing material guide mechanism includes two symmetrically arranged material guide plates, and the fixed plate is provided with a lateral traction component for lateral support of the film, and the lateral traction component can control the guide plate to perform reciprocating swinging motion through the swing material guide mechanism.

2. The device for uniformly coating a packaging film functional coating with improved gas barrier properties according to claim 1, characterized in that: The lateral traction assembly comprises a rotating rod rotatably mounted on the fixed plate and symmetrically arranged, a lateral support roller for traction film lateral flattening is fixed on the rotating rod, and an eccentric wheel is also fixed on the rotating rod.

3. The device for uniformly coating a packaging film functional coating with improved gas barrier properties according to claim 2, characterized in that: The deflection material guide mechanism includes a receiving plate fixed on the coating head, on which a support column for adjusting the deflection angle of the material guide plate is rotatably mounted; it also includes a follower component and a guide component that cooperate with the eccentric wheel and control the support column to perform reciprocating variable speed rotation.

4. The device for uniformly coating a packaging film functional coating with improved gas barrier properties according to claim 3, characterized in that: The follower assembly includes a movable sleeve that slides axially along the support column, a movable plate is fixed on the movable sleeve, and a limit column that cooperates with the eccentric wheel is fixed at the end of the movable plate; it also includes a variable pitch spiral groove opened on the circumferential outer wall of the support column, and a limit block that slides and engages with the variable pitch spiral groove is fixed on the inner wall of the movable sleeve.

5. The device for uniformly coating a packaging film functional coating with improved gas barrier properties according to claim 4, characterized in that: The guide assembly includes a guide column fixed on the movable plate and penetrating the receiving plate, a second spring is sleeved on the guide column, and two ends of the second spring are respectively in contact with the movable plate and the receiving plate.

6. The device for uniformly coating a packaging film functional coating with improved gas barrier properties according to claim 1, characterized in that: The buffer and pressure-stabilizing assembly includes a support rod fixed in the buffer tube, and a symmetrically arranged limiting ring is fixed on the support rod; it also includes a buffer disk that slides axially along the support rod, and the buffer disk is in abutment with the limiting ring. A first spring is sleeved on the support rod, and two ends of the first spring are respectively in abutment with the buffer disk and the buffer tube.

7. The device for uniformly coating a packaging film functional coating with improved gas barrier properties according to claim 1, characterized in that: The conduction component includes a discharge trough formed at one end of the coating head away from the buffer tube, and symmetrically arranged slide grooves are provided on both sides of the coating head.

8. The device for uniformly coating a packaging film functional coating with improved gas barrier properties according to claim 7, characterized in that: The conduction component also includes a blocking plate that slides along the slide track and cooperates with the discharge chute. A cylinder is fixed on the buffer tube, and the telescopic end of the cylinder is hinged with a connecting rod that is symmetrically arranged and hinged to the blocking plate.

9. The device for uniformly coating a packaging film functional coating with improved gas barrier properties according to claim 3, characterized in that: The coating and scraping assembly comprises an adjusting screw which is threadedly connected to the receiving plate and is symmetrically arranged, and a scraper is connected to the end of the adjusting screw.

10. The device for uniformly coating a packaging film functional coating with improved gas barrier properties according to claim 1, characterized in that: A supporting plate for carrying a film is fixed on the fixing plate.

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