A high-speed continuous coating device suitable for low-temperature drying of ultra-thin films

Abstract

The invention discloses a high-speed continuous coating device suitable for low-temperature drying of ultra-thin films, comprising a temperature control device, an unwinding device, an oven and a winding device which are arranged in sequence, the temperature control device pre-freezes the film, the unwinding device and the winding device are both linearly provided with a plurality of transmission rollers and tension adjustment rollers, the head of the unwinding device is provided with an unwinding roller, the unwinding device adopts a passive unwinding mode, the tail of the winding device is provided with a winding roller, the unwinding roller and the winding roller are both provided with a tension controller, the driving motor of the winding roller is electrically connected to the tension controller, the unwinding device is provided with a coating device, a passive roller is provided in the oven, and each roller is in rolling contact with the ultra-thin film. The invention can realize the efficient and uniform coating preparation of the ultra-thin film, can accurately control the uniformity of the coating, can obtain a precise coating product, and solves the problem of easy film breakage due to excessive tension and curling of the ultra-thin film caused by high-temperature coating.

Description

Technical Field

[0001] The invention relates to the technical field of coating equipment, and in particular to a high-speed continuous coating equipment suitable for low-temperature drying of ultra-thin films. Background Art

[0002] Coating technology can not only improve the physical and chemical properties of materials through processing methods, but also develop new products characterized by coatings, and it occupies an important position in the secondary processing of plastic films. Different coating structures and different product performances will inevitably have different requirements for coating technology. Although the coating process conditions can be adjusted by adjusting parameters such as vehicle speed, oven temperature and air volume, more coating processes that require special coating processing conditions are completed by special coating machines. Since the equipment structure can be specially designed according to product requirements, the adjustable range of its process parameters can be specialized and expanded to meet the special requirements of different products for coatings.

[0003] At present, the thickness of plastic films coated by coating machines is generally more than 10 microns, and they can withstand relatively large tension. However, with the development of demand, coating is required on thinner films (for example, less than 5 microns). Since the tension that ultra-thin films can withstand is very small, they are prone to wrinkling and film breakage, and curling is prone to occur in the high temperature of the oven after coating. Therefore, new technologies and new devices are urgently needed. Summary of the invention

[0004] The purpose of the present invention is to provide a high-speed continuous coating equipment suitable for low-temperature drying of ultra-thin films, so as to solve the problems existing in the above-mentioned prior art, so that the ultra-thin film can be evenly coated and dried at low temperature, and film breakage and curling can be avoided.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a high-speed continuous coating device suitable for low-temperature drying of an ultra-thin film, comprising a temperature control device, an unwinding device, an oven and a winding device which are arranged in sequence, wherein the temperature control device is used to pre-freeze the ultra-thin film, the unwinding device and the winding device are both linearly provided with a plurality of transmission rollers and tension adjustment rollers, the head of the unwinding device is provided with an unwinding roller, the tail of the winding device is provided with a winding roller, the unwinding roller and the winding roller are both provided with a tension controller, the driving motor of the winding roller is electrically connected to the tension controller, the unwinding device is provided with a coating device, a plurality of passive rollers are arranged in the oven, and the transmission roller, the tension adjustment roller, the unwinding roller, the winding roller and the passive roller all produce rolling contact with the ultra-thin film.

[0007] Preferably, the tension controller includes a PLC frequency converter and a magnetic powder controller, the drive motor is electrically connected to the PLC frequency converter, the PLC frequency converter is electrically connected to the magnetic powder controller, and the tension control accuracy of the tension controller is ±2N.

[0008] Preferably, the oven is provided with a plurality of groups of air supply systems and exhaust systems which are arranged at equal intervals and in correspondence with each other.

[0009] Preferably, the spacing between the driven rollers is 10-30 cm.

[0010] Preferably, the unwinding device and the rewinding device are both provided with a deviation-correcting roller, the deviation-correcting roller is in rolling contact with the ultra-thin film, and the deviation-correcting roller is electrically connected to the tension controller.

[0011] Preferably, the coating device is arranged between two tension adjustment rollers of the unwinding device.

[0012] Preferably, the winding device is provided with two tension swing rollers, and the tension swing rollers are electrically connected to the tension controller.

[0013] Preferably, the unwinding device and the rewinding device are both provided with displacement sensors, and the displacement sensors are electrically connected to the tension controller.

[0014] Preferably, the temperature control device includes a temperature control box, a box door, a bracket and a pulley. The temperature control box is cylindrical and has a rectangular opening on the side wall. Arc-shaped box doors are provided at both ends of the temperature control box through slide rails. The box doors match the rectangular openings. The bracket is respectively arranged at both ends of the temperature control box through bearings, and the pulley is arranged at the bottom of the bracket.

[0015] Preferably, the temperature-controlled box is a cylindrical freezer box using a two-stage refrigeration method, the diameter of the cylindrical freezer box is greater than 1.2m, the length is greater than 0.7m, and the lowest refrigeration temperature is lower than -50°C.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The coating machine structure developed in the present invention can realize efficient and uniform coating preparation of ultra-thin films, can accurately control the uniformity of coating, can obtain precise coating products, and solves the problems of film breakage due to excessive tension and curling of ultra-thin films caused by high-temperature coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the unwinding device in the present invention;

[0020] Figure 2 It is a structural schematic diagram of the winding device in the present invention;

[0021] Figure 3 It is a structural schematic diagram of the oven in the present invention;

[0022] Figure 4 The structure of the temperature control device in the present invention is shown in FIG. Figure 1 ;

[0023] Figure 5 The structure of the temperature control device in the present invention is shown in FIG. Figure 2 ;

[0024] Among them: 1-unwinding roller, 2-coating device, 3-tension controller, 4-tension adjusting roller, 5-driving roller, 6-correcting roller, 7-winding roller, 8-tension swing roller, 9-drying oven, 10-passive roller, 11-air supply system, 12-exhaust system, 13-ultra-thin film, 14-temperature control box, 15-box door, 16-bracket, 17-bearing, 18-pulley. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide a high-speed continuous coating device suitable for low-temperature drying of ultra-thin films, so as to solve the problems existing in the prior art, enable the ultra-thin film to be uniformly coated and dried at low temperature, and avoid film breakage and curling.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 5As shown: This embodiment provides a high-speed continuous coating device suitable for low-temperature drying of ultra-thin films, including a temperature control device, an unwinding device, an oven 9 and a winding device arranged in sequence, the temperature control device is used to pre-freeze the ultra-thin film 13 before entering the unwinding device, the unwinding device and the winding device are linearly provided with a plurality of transmission rollers 5 and tension adjustment rollers 4, the head of the unwinding device is provided with an unwinding roller 1, the unwinding device adopts a passive unwinding mode, the tail of the winding device is provided with a winding roller 7, the unwinding roller 1 and the winding roller 7 are both provided with a tension controller 3, the driving motor of the winding roller 7 is electrically connected to the tension controller 3, one end of the winding roller 7 is connected to the rotating shaft of the driving motor through a buckle, the unwinding device is provided with a coating device 2, and a plurality of passive rollers 10 are arranged in the oven 9, and the transmission roller 5, the tension adjustment roller 4, the unwinding roller 1, the winding roller 7 and the passive roller 10 are all in rolling contact with the ultra-thin film 13. Among them, the coating device 2 is a conventional coating device in the art.

[0029] The tension controller 3 includes a PLC frequency converter and a magnetic powder controller. The drive motor is electrically connected to the PLC frequency converter, which is electrically connected to the magnetic powder controller. The two work together to adjust the tension on the unwinding roller 1 and the winding roller 7. The tension control accuracy of the tension controller 3 is ±2N. The tension controller 3 can stabilize the tension of the ultra-thin film 13 during the operation of the equipment by adjusting the rotation speed. The PLC frequency converter is a high-precision frequency converter, which can prevent the ultra-thin film 13 from breaking due to uneven tension during the coating process.

[0030] The oven 9 is provided with a plurality of groups of air supply systems 11 and exhaust systems 12 at equal intervals (1m), and the air supply systems 11 and exhaust systems 12 of the present embodiment are air supply fans and exhaust fans. The spacing of the passive rollers 10 is 10-30cm, preferably 15cm. The oven 9 is equipped with high-density passive rollers 10, high-power air supply fans and exhaust fans, and the number of passive rollers 10, air supply fans and exhaust fans is increased, and the power of the fan is increased, which can ensure that the film is smoothly transmitted in the process of high-intensity warm air drying under the condition of atmospheric air flow speed, and the coating can be quickly dried at low temperature by increasing the air flow speed, avoiding the wrinkling and curling of the ultra-thin film 13.

[0031] The unwinding device and the winding device are both provided with a correction roller 6, which is arranged before the transmission roller 5, which is conducive to the transmission of the ultra-thin film 13 that is neat and wrinkle-free by the transmission roller 5. The correction roller 6 and the ultra-thin film 13 are in rolling contact, and the correction roller 6 is electrically connected to the tension controller 3. The winding device adopts a closed-loop magnetic powder torque control mode. The coating device 2 is arranged between the two tension adjustment rollers 4 of the unwinding device. The winding device is provided with two tension swing rollers 8, which are electrically connected to the tension controller 3, and adopts a double closed-loop speed control. The high-precision tension controller 3 uses the position of the tension swing roller 8 collected by the potentiometers arranged at both ends of the tension swing roller 8 to control the rotation speed of the tension swing roller 8, which can realize taper tension control.

[0032] like Figure 4-Figure 5 The temperature control device shown in the figure includes a temperature control box 14, a box door 15, a bracket 16 and a pulley 18. The temperature control box 14 is cylindrical and has a rectangular opening on the side wall. The two ends of the temperature control box 14 are provided with arc-shaped box doors 15 through slide rails. The box door 15 matches the rectangular opening. The bracket 16 is respectively provided at the two ends of the temperature control box 14 through bearings 17, and a pulley 18 is provided at the bottom of the bracket 16. The temperature control box 14 is a cylindrical freezer with a two-stage refrigeration method. The diameter of the cylindrical freezer is greater than 1.2m, the length is greater than 0.7m, and the minimum refrigeration temperature is lower than -50°C, which can effectively improve the elastic modulus and hardness of the material. The ultra-thin film 13 is pre-cooled to the required temperature (such as -30°C), and then the ultra-thin film 13 is placed in the unwinding device, and the temperature control system is adjusted as shown in the figure. Figure 5 As shown in the placement, the temperature control device can pre-freeze the ultra-thin film 13 to increase the hardness of the film and reduce the wrinkling and curling of the ultra-thin film 13 during the transmission and drying process.

[0033] like Figure 1 As shown, the tension adjustment rollers 4 in the unwinding device are rollers No. 1, 8, 9, 10, and 11, the transmission rollers 5 are rollers No. 2, 4, 5, 6, 7, and 12, and roller No. 3 is the deviation correction roller 6.

[0034] like Figure 2 As shown, the tension adjustment rollers 4 in the winding device are rollers No. 13, No. 16, and No. 21, the driving rollers 5 are rollers No. 15, No. 17, No. 18, No. 19, and No. 20, and roller No. 14 is the deviation correction roller 6.

[0035] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A high-speed continuous coating device suitable for low-temperature drying of ultra-thin films, characterized in that: It comprises a temperature control device, an unwinding device, an oven and a winding device which are arranged in sequence, wherein the temperature control device is used to pre-freeze the ultra-thin film, the unwinding device and the winding device are both linearly provided with a plurality of transmission rollers and tension adjustment rollers, the head of the unwinding device is provided with an unwinding roller, the tail of the winding device is provided with a winding roller, the unwinding roller and the winding roller are both provided with a tension controller, the driving motor of the winding roller is electrically connected to the tension controller, the unwinding device is provided with a coating device, a plurality of passive rollers are provided in the oven, and the transmission roller, the tension adjustment roller, the unwinding roller, the winding roller and the passive roller are all in rolling contact with the ultra-thin film; The tension controller includes a PLC frequency converter and a magnetic powder controller, the drive motor is electrically connected to the PLC frequency converter, the PLC frequency converter is electrically connected to the magnetic powder controller, and the tension control accuracy of the tension controller is ±2N; the oven is provided with a plurality of groups of air supply systems and exhaust systems at equal intervals; the spacing of the passive rollers is 10-30cm; The temperature control device includes a temperature control box, a box door, a bracket and a pulley. The temperature control box is cylindrical and has a rectangular opening on the side wall. Arc-shaped box doors are provided at both ends of the temperature control box through slide rails. The box doors match the rectangular openings. The brackets are respectively provided at both ends of the temperature control box through bearings, and the pulley is provided at the bottom of the bracket. The temperature control box is a cylindrical freezer using a two-stage refrigeration method. The diameter of the cylindrical freezer is greater than 1.2m, the length is greater than 0.7m, and the lowest refrigeration temperature is lower than -50°C.

2. The high-speed continuous coating equipment suitable for low-temperature drying of ultra-thin films according to claim 1, characterized in that: The unwinding device and the winding device are both provided with a deviation correction roller, the deviation correction roller is in rolling contact with the ultra-thin film, and the deviation correction roller is electrically connected to the tension controller.

3. The high-speed continuous coating equipment suitable for low-temperature drying of ultra-thin films according to claim 1, characterized in that: The coating device is arranged between two tension adjustment rollers of the unwinding device.

4. The high-speed continuous coating equipment suitable for low-temperature drying of ultra-thin films according to claim 1, characterized in that: The winding device is provided with two tension swing rollers, and the tension swing rollers are electrically connected to the tension controller.

5. The high-speed continuous coating equipment suitable for low-temperature drying of ultra-thin films according to claim 1, characterized in that: The unwinding device and the rewinding device are both provided with displacement sensors, and the displacement sensors are electrically connected to the tension controller.

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