Release film coating machine

Abstract

The invention discloses a release film coating machine which is characterized in that a deviation rectifying structure is arranged to firstly tidy, smooth, effectively limit and guide a release film after the release film is put on a machine, so that the coating accuracy and uniformity are ensured; the flattening mechanism arranged at the front end of the guide cavity is used for pushing aside, flattening and tensioning the release film and gently guiding the release film to the guide cavity at the rear end, so that the problem of non-uniform conveying stress caused by non-uniform local thickness and non-smooth surface of the release film is prevented; an auxiliary guide mechanism is arranged at the rear end, a conveying path before the release film enters the deviation rectifying mechanism is pre-guided and positioned, the release film is tensioned in the advancing direction of the release film, and the coating accuracy of the release film is further guaranteed; the bent side wall of the guide plate is in sliding contact with the release film, and the auxiliary guide mechanism is provided with a flexible anti-slip ring sleeve, so that the release film is prevented from being damaged in the moving and positioning processes; the device is simple in structure and high in deviation rectifying efficiency, the deviation rectifying mechanism can be adjusted to adapt to coating of release films of different specifications and models, and the applicability is high.

Description

Technical Field

[0001] The present invention relates to a coating machine, in particular to a release film coating machine with a deviation correction function. Background Art

[0002] Release film is a functional film coated with a special release agent (such as silicone oil) to prevent sticking or facilitate peeling. It is widely used in industries such as electronics, pharmaceuticals, food packaging, and advertising materials. Whether the release film is evenly applied to prevent sticking or facilitate peeling is crucial for both coating uniformity and stable film delivery. Traditional release film coating processes typically utilize a dynamic rewinding mechanism, pressure rollers, or fixed tracks to adjust the film's delivery angle and stability. However, during the actual production process, the winding mechanism adjusts the stability of the release film conveyance, ensuring a certain degree of flatness. However, there is a certain lag in the printing accuracy conditions, resulting in low printing accuracy at the edges of the release film. The pressure roller applies a certain external force to prevent the release film from deflecting, which can cause certain damage to the release film surface and cannot guarantee the flatness of the release film. The fixed track is used to ensure the stability of the release film conveyance, but friction between the side of the release film and the track damages the release film. Once the deviation angle is large and the film cannot be automatically adjusted, it will need to be shut down for maintenance. Existing coating devices also have correction devices for the winding mechanism, conveying mechanism, or coating mechanism. These devices are complex in structure and have poor control accuracy. They cannot simultaneously correct the flatness of the release film and have a significant lag. In particular, correction for the winding mechanism has limited improvement in coating accuracy and cannot completely avoid the problem of uneven coating. Blank areas will still appear, resulting in material waste, increased production costs, and may require additional manual intervention to correct the problem, further reducing production efficiency. Summary of the Invention

[0003] Purpose of the invention: The purpose of the present invention is to improve the uniformity and accuracy of release film coating and to provide a release film coating machine with a simple structure and high correction efficiency.

[0004] Technical solution: The release film coating machine described in the present invention includes a frame, a conveyor belt is provided on the frame, a coating head is provided above the conveyor belt, and a correction mechanism is also provided above the conveyor belt and at the front end of the coating head; the correction mechanism includes two symmetrically arranged guide plates, the outer edges of the two guide plates are curled upward and symmetrically to form side walls supporting the release film, the two guide plates gradually approach each other starting from the end away from the coating head to form a guide cavity for limiting and guiding the release film, and the symmetry axis of the guide cavity is aligned with the coating center axis of the coating head.

[0005] Furthermore, the outer edge of the guide plate gradually curls upward, forming a rectangular cavity of a certain width at the end of the guide cavity. This rectangular cavity enhances the stability of the guide cavity's positioning and guiding of the release film, preventing interference from external factors and further improving coating accuracy. The release film slides against the curved sidewalls of the guide cavity, positioning and guiding the release film while preventing hard contact, thereby preventing damage to the release film and improving coating quality.

[0006] Furthermore, it also includes a correction adjustment device for adjusting the distance between the two guide plates and thus the width of the guide cavity. The correction adjustment device includes a first electric cylinder for adjusting the distance between the two guide plates, and the screw of the first electric cylinder is fixedly connected to the guide plates. When the size of the release film being produced changes, the first electric cylinder can be used to adjust the distance between the two guide plates to match the size of the release film, ensuring that the guide cavity can effectively organize and smooth the release film, as well as effectively limit and guide it, thereby ensuring coating uniformity and coating accuracy. The correction adjustment device also includes multiple first telescopic rods for improving the stability of the guide plates; the ends of the first telescopic rods are distributed and fixed to the frame and the guide plates.

[0007] Furthermore, an auxiliary guide mechanism is provided on the frame, at the rear end of the coating head. This auxiliary guide mechanism comprises an electric slide fixedly connected to the frame for adjusting the forward angle of the release film. The slide is slidably connected to a bracket; guide rollers are positioned between the brackets. The guide rollers provide initial guidance for the release film, ensuring it enters the subsequent deflection correction mechanism in a relatively regular state and tensioning it in its forward direction, reducing the burden on the deflection correction mechanism and improving the deflection correction and conveying efficiency of the entire device.

[0008] Furthermore, the guide rollers comprise a driving roller and a driven roller, each of which is covered with a flexible anti-slip sleeve made of silicone and having anti-slip grooves. This increases the sleeve's surface roughness, and when in contact with the release film, the anti-slip grooves increase the contact area with the film, significantly increasing the friction between the guide roller and the release film. This ensures that the release film can better follow the rotation of the guide roller, preventing slipping during transport, ensuring stable and accurate transport of the release film, and further reducing the risk of the release film shifting during transport.

[0009] Furthermore, a smoothing mechanism is symmetrically arranged at the front end of the combing chamber, and the smoothing mechanism includes a second electric cylinder fixed above the guide plate, a motor is fixed to the movable end of the second electric cylinder, and the output shaft of the motor is connected to a smoothing plate for improving the flatness of the release film. The smoothing plate rotates perpendicular to the forward direction of the release film, and the release film is pushed aside, smoothed, and tensioned in the forward direction perpendicular to the release film, and the release film is gently guided to the guide cavity at the rear end, so as to prevent the problem of uneven transmission force caused by uneven local thickness and uneven surface of the release film, and prevent the release film from wrinkling or deviating from the moving trajectory during movement, thereby ensuring the stability of the release film during transmission.

[0010] Furthermore, the smoothing plate is a spring steel sheet, and a free end thereof is provided with an arc-shaped guide surface.

[0011] Furthermore, the surface of the smoothing plate is covered with an anti-stick coating to prevent adhesion when smoothing the release film, and the smoothing effect cannot be guaranteed.

[0012] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: 1. A correction structure is set to first organize and smooth the release film after it is put on the machine, as well as to effectively limit and guide it, so as to ensure the accuracy and uniformity of coating; 2. The smoothing mechanism arranged at the front end of the guide cavity pushes away, smoothes and tensions the release film, and gently guides the release film to the guide cavity at the rear end, so as to prevent the problem of uneven transmission force caused by uneven local thickness and uneven surface of the release film; 3. An auxiliary guiding mechanism is set at the rear end to pre-guide and position the transmission path of the release film before it enters the correction mechanism, and tension the release film in its forward direction, so as to further ensure the accuracy of release film coating; 4. The curved side wall of the guide plate is in sliding contact with the release film and the flexible anti-slip ring sleeve arranged by the auxiliary guiding mechanism prevents the release film from being damaged during the movement and positioning process; 5. The device has a simple structure and high correction efficiency. The correction mechanism can be adjusted to apply to the coating of release films of different specifications and models, and has strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the structure of the first embodiment of the present invention;

[0014] Figure 2 It is a structural schematic diagram of the smoothing mechanism of the present invention;

[0015] Figure 3 Schematic diagram of the structure of the second embodiment of the present invention. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0017] Example 1

[0018] like Figure 1 The release film coating machine shown includes a frame 1, a conveyor belt 2 is provided on the frame 1, a coating head 603 is provided above the conveyor belt 2, the coating head 603 is connected to the release agent storage tank 601 through a discharge pipe 602, and a pressure pump 604 and a metering valve 605 are provided on the discharge pipe 602 to ensure uniformity of coating. A correction mechanism is also provided above the conveyor belt 2 and at the front end of the coating head 603 that is in contact with the conveyor belt 2. The correction mechanism includes a guide plate 301 symmetrically arranged above the conveyor belt 2. The outer edges of the guide plates 301 are symmetrically curled upward to form side walls that support the release film. The two guide plates 301 gradually move closer together from the end away from the coating head 603 to form a guide cavity 302. The degree of upward curling of the outer edges gradually increases to form a rectangular cavity with a width of approximately 1 to 2 cm at the end of the guide cavity 302. The symmetry axis of the guide cavity 302 is aligned with the coating center axis of the coating head 603, which is used to control the release film to pass through the coating area accurately to ensure coating accuracy. The deflection correction mechanism also includes a deflection correction adjustment device for adjusting the distance between the two guide plates 301 and, consequently, the width of the guide cavity 302. This device comprises a first electric cylinder 501 for adjusting the distance between the two guide plates 301. The screw of the first electric cylinder 501 is fixedly connected to the guide plates 301. The device also includes multiple first telescopic rods 502, each of which is fixed to the frame 1 and the guide plates 301 at both ends. These rods enhance the stability of the guide plates 301 during adjustment. Adjusting the distance between the two guide plates 301, and thus the width of the guide cavity 302, is done according to the specifications and size of the release film, thereby adjusting the coating range of the coating head 603 to accommodate different release film coating requirements.

[0019] A smoothing mechanism is provided on the side of the guide plate 301 away from the coating head 603. Figure 2 As shown, the smoothing mechanism includes a second electric cylinder 321 fixed above the guide plate 301. The screw of the second electric cylinder 321 is connected to a motor 322. The output shaft of the motor 322 is connected to a smoothing plate 323 for smoothing the release film. The smoothing plate 323 rotates perpendicular to the direction of the release film's movement to spread and smooth the folded release film. The smoothing plate 323 is a spring steel sheet with a curved guide surface at its free end and a non-stick coating.

[0020] When the equipment is running, the conveyor belt 2 drives the release film forward together. After the release film moves to the correction mechanism, it positions and guides the release film at the front end of the guide cavity 302. The smoothing mechanism operates at the same time, and the second electric cylinder 321 drives the smoothing plate 323 to reciprocate along the forward direction perpendicular to the release film. Driven by the motor 322, the smoothing plate 323 rotates perpendicular to the forward direction of the release film, and the release film is pushed aside, smoothed and tensioned in the forward direction perpendicular to the release film, and the release film is gently guided to the guide cavity 302 at the rear end, so as to prevent the uneven transmission force caused by the uneven thickness and uneven surface of the release film, and prevent the release film from wrinkling or deviating from the moving trajectory during movement, thereby ensuring the stability of the release film during transmission. The release film smoothly enters the rectangular cavity at the rear end of the guide cavity 302. The two side walls of the guide cavity 302 slide in contact with the release film, precisely limiting its position and preventing it from shifting laterally during transport due to external factors (such as vibration of the conveyor belt 2, airflow interference, etc.). This ensures that the release film can pass smoothly through the coating area of the coating head 603 along a precise path, thereby ensuring coating accuracy and quality. The coating device begins operation. Under the action of the pressure pump 604, the release agent in the storage tank 601 is transported to the coating head 603 through the discharge pipe 602. The metering valve 605 precisely controls the flow of the release agent, and the coating head 603 evenly applies the release agent to the surface of the release film, ensuring coating uniformity.

[0021] When the size of the release film produced changes, the first electric cylinder 501 can be used to adjust the distance between the two guide plates 301 to match the size of the release film, ensuring that the guide cavity 302 can effectively organize and smooth the release film. The side walls of the guide cavity 302 slide and fit with the two sides of the release film to effectively limit and guide, thereby ensuring the uniformity and accuracy of the coating.

[0022] Example 2

[0023] like Figure 3 As shown, unlike Example 1, an auxiliary guiding mechanism is further provided on the frame 1 and at the rear end of the coating head 603 to pre-guide and position the conveying path of the release film before it enters the correction mechanism. The auxiliary guiding mechanism includes an electric slide 401 fixedly connected to the frame 1 for adjusting the forward angle of the release film. The electric slide 401 is slidably connected to the bracket 402. Guide rollers are provided between the brackets 402. The guide rollers include an active roller 403 and a driven roller 404. The active roller 403 and the driven roller 404 are provided with flexible anti-slip rings. The flexible anti-slip rings are made of silicone and have anti-slip grooves on their surface. During guidance, the flexible material prevents damage to the release film, and the anti-slip grooves prevent the release film from slipping, ensuring the effectiveness of the guidance.

[0024] After the release film enters the equipment and before coating begins, it is driven by conveyor belt 2 to the auxiliary guide mechanism and then transported backward, tensioning the release film in its forward direction. The electric slide 401 controls the movement of bracket 402, which in turn drives the guide rollers to a specified position based on the release film's specifications and conveying position deviation. This initial guide roller guides the release film, allowing it to enter the subsequent deflection correction mechanism in a relatively regular state, reducing its burden and improving the deflection correction and conveying efficiency of the entire device. The guide roller assembly comprises a driving roller 403 and a driven roller 404, both of which are rotatably connected to the movable portion of the electric slide 401 via bracket 402. The active roller 403 rotates under the drive of a driving device (not shown in the figure, usually a motor), and the driven roller 404 rotates synchronously therewith. After the release film enters, it will contact the active roller 403 and the driven roller 404. Under the action of friction, the release film is driven forward and transported. The release film is evenly stressed during the conveying process and can maintain a relatively stable conveying speed and direction, avoiding problems such as position offset or wrinkles due to poor conveying or uneven force, and providing a good conveying foundation for subsequent correction and coating processes. The surfaces of the active roller 403 and the driven roller 404 are covered with flexible anti-skid ring sleeves made of silicone material, which have good elasticity and flexibility. When in contact with the release film, they can undergo a certain degree of elastic deformation and fit closely to the surface of the release film, thereby increasing the contact area between the roller group and the release film. They can also play a buffering role, reducing the damage to the release film that may be caused by the rotation of the guide roller, such as scratches and indentations, thereby protecting the surface quality of the release film. The outer peripheral surface of the flexible anti-skid ring sleeve is provided with a wavy anti-skid pattern, which increases the roughness of the ring sleeve surface. When in contact with the release film, the anti-skid pattern increases the contact area with the surface of the release film, significantly increasing the friction between the guide roller and the release film, ensuring that the release film can better follow the rotation of the guide roller and move, avoiding slipping during the transmission process, ensuring the stability and accuracy of the release film transmission, and further reducing the risk of the release film offset during the transmission process.

Claims

1. A release film coating machine, comprising a frame (1), a conveyor belt (2) provided on the frame (1), and a coating head (603) provided above the conveyor belt (2), characterized in that: A correction mechanism is also provided above the conveyor belt (2) and at the front end of the coating head (603); the correction mechanism comprises two symmetrically arranged guide plates (301), the outer edges of the two guide plates (301) are symmetrically curled upward to form side walls supporting the release film, and the two guide plates (301) gradually move closer to each other starting from the end away from the coating head (603) to form a guide cavity (302) for limiting and guiding the release film, and the symmetry axis of the guide cavity (302) is aligned with the coating center axis of the coating head (603).

2. The release film coating machine according to claim 1, characterized in that: The outer side of the guide plate (301) is curled upwards to a gradually increasing degree, forming a rectangular cavity at the end of the guide cavity (302).

3. The release film coating machine according to claim 1, characterized in that: The invention also includes a deviation correction adjustment device for adjusting the distance between the two guide plates (301) and thus adjusting the width of the guide cavity (302). The deviation correction adjustment device includes a first electric cylinder (501) for adjusting the distance between the two guide plates (301). The lead screw of the first electric cylinder (501) is fixedly connected to the guide plate (301).

4. The release film coating machine according to claim 3, characterized in that: The deviation correction and adjustment device further comprises a plurality of first telescopic rods (502) for improving the stability of the guide plate (301); both ends of the first telescopic rods (502) are distributed and fixed on the frame (1) and the guide plate (301).

5. The release film coating machine according to claim 1, characterized in that: An auxiliary guide mechanism is provided on the frame (1) and at the rear end of the coating head (603), and the auxiliary guide mechanism includes an electric slide (401) fixedly connected to the frame (1) for adjusting the forward angle of the release film, and the electric slide (401) is slidably connected to the bracket (402); guide rollers are provided between the brackets (402).

6. The release film coating machine according to claim 5, characterized in that: The guide roller comprises an active roller (403) and a driven roller (404), and a flexible anti-slip ring sleeve is provided on the surface of the guide roller.

7. The release film coating machine according to claim 6, characterized in that: The flexible anti-skid ring sleeve is made of silica gel and has anti-skid patterns on its surface.

8. The release film coating machine according to claim 1, characterized in that: A smoothing mechanism is symmetrically arranged at the front end of the guide plate (301), and the smoothing mechanism includes a second electric cylinder (321) fixed on the guide plate (301), a motor (322) is fixed to the movable end of the second electric cylinder (321), and an output shaft of the motor (322) is connected to a smoothing plate (323) for improving the flatness of the release film, and the smoothing plate (323) rotates perpendicular to the forward direction of the release film.

9. The release film coating machine according to claim 8, characterized in that: The smoothing plate (323) is a spring steel sheet, and a free end thereof is provided with an arc-shaped guide surface.

10. The release film coating machine according to claim 9, characterized in that: The surface of the smoothing plate (323) is covered with an anti-stick coating.

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