Main roller system with adsorption adjusting function and vacuum winding evaporation coating equipment

Abstract

The main roller system with the adsorption adjusting function comprises a main roller, an auxiliary roller, a power supply part, a first driving part, a second driving part, a temperature sensor and a controller, a gear disc is installed on a bearing seat of a roller shaft of the main roller, and a sliding groove is formed in the gear disc; a bearing seat of a roller shaft of the auxiliary roller is mounted on the gear disc; the power supply part is used for applying direct-current bias voltages with opposite electrical properties to the main roller and the auxiliary roller; the driving end of the first driving part is connected with the gear disc and used for enabling the auxiliary roller shaft to rotate around the axis direction of the main roller so as to adjust the cooling wrap angle of the base film on the main roller. The second driving part is used for enabling the auxiliary roller to move in the direction of the connecting line of the spindle axis and the auxiliary roller axis so as to adjust the distance between the main roller and the auxiliary roller. The temperature sensor is used for detecting the temperature of a base film on the main roller; and the controller is in signal transmission with the temperature sensor, the first driving part and the second driving part. The invention further discloses vacuum winding evaporation coating equipment with the main roller system with the adsorption adjusting function.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum winding coating, and in particular relates to a main roller system with adsorption adjustment function and vacuum winding evaporation coating equipment. Background Art

[0002] In the vacuum winding coating process, the cooling effect of the main roller on the base film directly affects the quality of the coated product. In order to improve the cooling effect of the base film on the main roller, the industry mainly adopts a DC bias voltage with opposite electrical properties between the main roller and the base film, and uses the electrostatic adsorption principle to adsorb the base film on the main roller for cooling. The DC bias value on the main roller and the base film is adjusted to adjust the degree of adhesion of the base film on the main roller, thereby achieving the cooling effect of adjusting the base film on the main roller.

[0003] However, the inventors have found that when the ambient temperature of vacuum coating fluctuates due to fluctuations in certain process conditions, adjusting the bias value on the main roller or the auxiliary roller to adjust the cooling effect of the main roller on the base film will affect the microstructure of the film layer in the length section of the base film when the adjustment occurs to varying degrees, causing the film layer performance of this length section to differ from that of the previous length section to varying degrees. At the same time, when the cooling effect of the base film is insufficient, increasing the bias value to increase the strength of the base film attached to the main roller also has the risk of a breakdown accident due to excessive bias. Summary of the invention

[0004] The object of the present invention is to provide a main roller system and a vacuum winding evaporation coating equipment with adsorption adjustment function, wherein the cooling wrap angle of the base film on the main roller is adjusted by a first driving unit, and the axial spacing between the main roller and the auxiliary roller is adjusted by a second driving unit to adjust the cooling effect of the main roller on the base film, thereby improving the stability of the surface temperature of the base film, and further improving the quality and performance of the wound coating products.

[0005] In some embodiments, a main roller system with an adsorption adjustment function includes: a main roller, a gear plate is installed on the bearing seat of the roller shaft of the main roller; a slide groove is provided on the gear plate; an auxiliary roller, the bearing seat of the roller shaft of the auxiliary roller is installed on the gear plate; a power supply unit, the power supply unit is used to apply a DC bias voltage with opposite electrical properties to the main roller and the auxiliary roller; a first driving unit, the driving end of the first driving unit is connected to the gear plate, and is used to drive the gear plate to drive the roller shaft of the auxiliary roller to rotate around a first direction to adjust the cooling wrap angle of the base film on the main roller; wherein the first direction is the axial direction of the main roller; a second driving unit, the second driving unit drives the bearing seat of the roller shaft of the auxiliary roller to slide in the slide groove of the gear plate, and drives the auxiliary roller to move along the second direction to adjust the axial spacing between the main roller and the auxiliary roller. The second direction is the direction of the line connecting the axis of the main shaft and the axis of the auxiliary roller; the slide groove is arranged along the second direction; the temperature sensor, the detection end of the temperature sensor faces the side of the main roller, and is used to detect the temperature of the base film on the main roller; the controller, the controller transmits signals with the temperature sensor, the first drive unit and the second drive unit respectively; the temperature sensor can convert the detected base film temperature into a temperature signal, the controller obtains the temperature signal, and controls the first drive unit and the second drive unit to work based on the temperature signal, adjusts the cooling wrap angle of the base film on the main roller, and adjusts the adsorption force of the base film on the main roller, wherein the adsorption force of the base film on the main roller is adjusted by adjusting the axial distance between the main roller and the auxiliary roller, thereby adjusting the cooling effect of the main roller on the base film. When the base film passes through the auxiliary roller and the main roller, the contact with the roller surface is two different surfaces.

[0006] Optionally, the main roller is made of stainless steel. The main roller has a flow channel for circulating cooling medium inside. The surface of the main roller has a thermally conductive and insulating ceramic layer to prevent the base film from directly contacting the main roller and igniting during the evaporation process.

[0007] Optionally, the auxiliary roller is made of one of conductive rubber, stainless steel, carbon fiber, etc. The surface of the auxiliary roller has no insulating coating.

[0008] Optionally, the base film is made of one selected from polyethylene terephthalate (PET), polypropylene (PP), and polyimide (PI).

[0009] Optionally, the width of the base film is determined according to the length of the main roller.

[0010] Optionally, the composition of the metal film layer deposited on the base film is one selected from copper, aluminum, silver, nickel, molybdenum, titanium, niobium, iron, zinc, and stainless steel.

[0011] Optionally, the power supply unit includes a power supply, a first conductive member, and a second conductive member. The main roller is electrically connected to the power supply via the first conductive member, and the auxiliary roller is electrically connected to the power supply via the second conductive member. The auxiliary roller and the main roller have opposite charges.

[0012] Optionally, the first conductive brush and the second conductive brush are made of copper bolts and PVC insulating rubber blocks.

[0013] Optionally, the first conductive brush and the second conductive brush may be replaced by a first conductive slip ring and a second conductive slip ring, respectively.

[0014] Optionally, the base film after the metal film layer is deposited is first connected to the auxiliary roller for electrical conduction, so that the base film after the metal film layer is deposited and the main roller have opposite electrical properties. Due to the principle of opposites attracting each other, the base film after the metal film layer is deposited and the main roller are closely attached through the generated electrostatic adsorption force, thereby increasing the cooling effect.

[0015] Optionally, the DC bias voltages with opposite electrical properties applied to the main roller and the auxiliary roller have a value in the range of 0-600V.

[0016] Optionally, the cooling wrap angle of the base film on the main roller is continuously adjustable within the range of 120-320°, the adjustment range of the cooling wrap angle is 0-150°, and the adjustment accuracy is 0.01°.

[0017] Optionally, the adjustment range of the axial distance between the main roller and the auxiliary roller is 0-20 cm, and the adjustment accuracy is 0.05 mm.

[0018] Optionally, there are two gear plates, which are respectively installed on the bearing seats at both ends of the main roller shaft. The first driving part includes a gear shaft and a first motor. The small gears at both ends of the gear shaft are respectively engaged with the two gear plates. The driving end of the first motor is connected to one end of the gear shaft for driving the gear shaft to rotate.

[0019] Optionally, the gear shaft is made of stainless steel.

[0020] Optionally, the second driving unit includes: a gear, installed on the bearing seat of the auxiliary roller shaft; a rack, fixedly arranged on the gear plate, forming a rack and pinion transmission mechanism with the gear; a second motor, the second motor drives the gear to rotate, and drives the bearing seat of the auxiliary roller shaft to slide in the slide groove of the gear plate along the second direction through the rack and pinion transmission mechanism.

[0021] Optionally, the maximum stroke between the bearing seat of the auxiliary roller shaft and the slide groove is not less than 250 mm; the material of the inner wall of the slide groove is one of polytetrafluoroethylene and graphite.

[0022] The controller controls the first driving unit to drive the gear plate to rotate around the roller shaft of the main roller at a certain angle, and the gear plate drives the roller shaft of the auxiliary roller to rotate around the roller shaft of the main roller at a corresponding angle, thereby adjusting and controlling the cooling wrap angle of the base film around the main roller. The controller controls the second driving unit to drive the bearing seat of the roller shaft of the auxiliary roller to slide a certain distance in the slide groove of the gear plate along the second direction, thereby adjusting and controlling the axial distance between the auxiliary roller and the main roller.

[0023] Optionally, when the detected base film temperature is too high, the controller controls the first drive unit to increase the cooling wrap angle of the base film on the main roller. At the same time, the controller controls the second drive unit to reduce the axial distance between the auxiliary roller and the main roller, thereby increasing the adsorption force of the base film on the main roller and improving the cooling effect of the main roller on the base film.

[0024] Optionally, when the detected base film temperature is low, the controller controls the first drive unit to reduce the cooling wrap angle of the base film on the main roller. At the same time, the controller controls the second drive unit to increase the axial distance between the auxiliary roller and the main roller, thereby reducing the adsorption force of the base film on the main roller and reducing the cooling effect of the main roller on the base film.

[0025] Optionally, the temperature sensor is a laser temperature sensor, which is used to detect the temperature of the base film on the main roller and feed back a temperature signal of the detected base film temperature to the controller.

[0026] The controller performs feedback control on the temperature of the base film on the main roller by adjusting the cooling wrap angle and adsorption force of the base film on the main roller, so that the base film temperature approaches the target temperature value pre-set in the controller and keeps the base film temperature on the main roller stable during the entire vacuum winding coating process.

[0027] In the above embodiments, the surface temperature of the base film affects the migration kinetic energy and mobility of the metal film particles deposited on the base film, thereby affecting the film quality. For example, when the base film temperature is too low, the mobility of the metal film particles is low, resulting in a low density, porous and rough surface of the formed film. As the base film temperature increases, the deposited metal film particles can obtain sufficient energy to migrate along the surface and the body, combine with other particles to form crystals, the crystal growth rate is accelerated, the grains become larger, the film cleanliness is improved, and the film quality is good. The film quality described here is mainly reflected in the microstructure and film forming rate presented by the deposited film layer. Therefore, for a film layer of a certain composition, the presence of a more suitable base film temperature is beneficial to the film quality of the film layer. The present invention adjusts the cooling wrap angle of the base film on the main roller and the adsorption force of the base film on the main roller by setting a first drive unit and a second drive unit to achieve the cooling effect of adjusting the base film on the main roller; wherein, the adsorption force of the base film on the main roller is adjusted by adjusting the axial spacing between the main roller and the auxiliary roller, rather than by adjusting the bias value on the main roller or the auxiliary roller. By adjusting the cooling effect of the base film on the main roller, the base film temperature on the main roller is made to approach a more suitable target temperature in real time, and the base film temperature is kept stable during the entire vacuum winding coating process.

[0028] In the prior art, the adhesion between the base film and the main roller is generally enhanced by adopting an electrostatic bias adsorption method. In this type of technology, the electrostatic adsorption force between the base film and the main roller is generally adjusted by changing the bias value on the main roller or the auxiliary roller to achieve the cooling effect of adjusting the base film on the main roller. The inventor found that although this approach can cope with the influence of the temperature fluctuation of the vacuum coating environment on the base film temperature, when the system works for a long time, changing the bias value on the main roller or the auxiliary roller will affect the performance and film layer microstructure of the produced coating products in certain length sections, resulting in different degrees of differences in the performance and film layer microstructure of the coating products in this length section and other length sections, thereby affecting the stability and consistency of the performance of the entire roll of coating products. The inventor found through research that when the base film is attached to the main roller by the electrostatic adsorption force, a bias electric field with a certain intensity and distribution characteristics will be distributed on the surface of the base film, and the intensity and distribution characteristics of this bias electric field are directly related to the bias value on the main roller and the bias value applied to the base film by the auxiliary roller. When a metal film is deposited on the base film, the metal film particles deposited on the surface of the base film will have different degrees of movement trends before film formation due to the influence of the bias electric field, changing the film-forming behavior of the metal film particles, and this factor will have different degrees of influence on the microstructure of the film. In the vacuum winding coating production process, when the process conditions are relatively stable, the bias values ​​on the main roller and the auxiliary roller remain stable to maintain the stable cooling effect of the base film. At this time, since the film deposition conditions and the bias electric field distributed on the surface of the base film are relatively stable, the microstructure and performance of the deposited film can also be relatively stable. However, when the ambient temperature of the vacuum coating fluctuates due to the fluctuation of certain process conditions, once the bias value on the main roller or the auxiliary roller is adjusted to adjust the cooling effect of the main roller on the base film, the bias electric field distributed on the surface of the base film will change, causing the movement trend and film-forming behavior of the metal film particles to change, thereby affecting the microstructure of the film layer of this length segment to varying degrees, so that the film layer performance of this length segment is different from that of the previous length segment to varying degrees. In addition, when the cooling effect of the base film is insufficient, increasing the bias voltage value to increase the strength of the base film attached to the main roller also carries the risk of a breakdown accident due to excessive bias voltage.

[0029] The present invention adjusts the adsorption force of the base film on the main roller by adjusting the axial spacing between the main roller and the auxiliary roller, rather than by adjusting the bias value on the main roller or the auxiliary roller. By adjusting the axial spacing between the main roller and the auxiliary roller, the bias values ​​on the main roller and the auxiliary roller are maintained unchanged while adjusting the adsorption force of the base film on the main roller, thereby maintaining the stability of the bias electric field distributed on the base film. In combination with the adjustment method of the present invention, the temperature of the base film attached to the main roller is kept stable during the entire vacuum winding coating process. In summary, the film quality of the metal film layer particles deposited on the base film can be guaranteed, and the film layer microstructure and product performance of the coated product can be kept stable and consistent at the front and back stages of the coating production cycle.

[0030] In some embodiments, the vacuum winding evaporation coating equipment includes the above-mentioned main roller system with adsorption adjustment function, a cavity and an evaporator. Among them, the number of main roller systems with adsorption adjustment function is more than one; the evaporator is arranged below the main roller, and the number of evaporators is more than one. The bearing seat of the main roller shaft is fixedly installed on the wall panel arranged in the cavity.

[0031] Optionally, the vacuum winding evaporation coating equipment also includes a unwinding roller, a first guide roller, a flattening roller, a second guide roller and a winding roller.

[0032] Optionally, the unwinding roller and the winding roller are made of stainless steel. The unwinding roller is an air expansion roller, which can be inflated and deflated to replace the winding core, and the rolled base film is unwound according to the film drawing direction. The winding roller is an air expansion roller, which can be inflated and deflated to replace the winding core, and the base film after the metal film layer is deposited is rolled into a cylindrical roll film.

[0033] Optionally, the flattening roller is made of a rubber roller, and is used to flatten the base film to reduce wrinkles on the base film.

[0034] In this embodiment, the base film is guided by the unwinding roller into the first guide roller, and then guided by the first guide roller into the flattening roller, and then the flattening roller flattens the base film and guides it into the main roller. The evaporator is used to deposit a metal film layer on the base film on the main roller to obtain the base film after the metal film layer is deposited. The base film after the metallized film layer is deposited is guided by the main roller to pass through the auxiliary roller. Among them, the surfaces of the base film that contact the roller surface when the base film passes through the main roller and the auxiliary roller are two different surfaces of the base film, and when passing through the auxiliary roller, the metal film layer and the surface of the auxiliary roller are tightly attached by tension so that the base film after the metallized film layer is deposited has the same electrical properties as the auxiliary roller. Since the DC bias of the main roller and the auxiliary roller is opposite in electrical properties, the base film after the metallized film layer is deposited has a DC bias opposite to that of the main roller, and the base film after the metallized film layer is deposited in the main roller section is tightly attached to the main roller by electrostatic adsorption. At the same time, the temperature of the base film on the main roller is detected in real time by the temperature sensor, and the roller shaft of the auxiliary roller is adjusted to rotate around the first direction by the first driving unit to adjust the cooling wrap angle of the base film on the main roller, and the auxiliary roller is driven to move along the second direction by the second driving unit to adjust the axial spacing between the main roller and the auxiliary roller, thereby adjusting the adsorption force of the base film on the main roller; in this equipment, by adjusting the cooling wrap angle of the base film on the main roller and adjusting the adsorption force of the base film on the main roller, the cooling effect of the base film on the main roller is adjusted, so that the temperature of the base film attached to the main roller remains stable and consistent throughout the vacuum winding coating process. The base film after the metal film layer is deposited is then guided to the second guide roller by the auxiliary roller, and then guided to the winding roller by the second guide roller, and rolled into a cylindrical roll by the winding roller, completing the entire coating process of the vacuum winding evaporation coating equipment.

[0035] The main roller system with adsorption adjustment function and vacuum winding evaporation coating equipment provided by the present invention have the following beneficial effects:

[0036] (1) The present invention adjusts the adsorption force of the base film on the main roller by adjusting the axial distance between the main roller and the auxiliary roller, rather than adjusting the bias value on the main roller or the auxiliary roller. In this way, while adjusting the adsorption force of the base film on the main roller, the bias value on the main roller and the auxiliary roller is maintained unchanged, thereby maintaining the stability of the bias electric field distributed on the base film. Furthermore, combined with the adjustment and control method of the present invention, the temperature of the base film attached to the main roller is kept stable during the entire vacuum winding coating process. In summary, the film quality of the metal film layer particles deposited on the base film can be guaranteed, that is, the film layer microstructure of the coated product and the performance of the product are guaranteed to be stable and consistent in the front and back stages of the coating production cycle. At the same time, the risk of a breakdown accident caused by excessive bias voltage due to increasing the bias value in order to increase the strength of the base film attached to the main roller is avoided.

[0037] (2) The present invention adjusts the temperature of the base film attached to the main roller to achieve precise adjustment of the microstructure of the deposited metal film layer, thereby improving the quality and performance of the coated product. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of a main roller system with adsorption adjustment function provided by the present invention.

[0039] Figure 2 It is a three-dimensional structural schematic diagram of a main roller system with adsorption adjustment function provided by the present invention.

[0040] Figure 3 It is a structural schematic diagram of a first driving part and a second driving part in a main roller system with adsorption adjustment function provided by the present invention.

[0041] Figure 4 It is a structural schematic diagram of a vacuum winding evaporation coating device provided by the present invention. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0043] Combination Figure 1 , Figure 2 and Figure 3As shown, the main roller system with adsorption adjustment function includes: a main roller 10, an auxiliary roller 20, a power supply unit 40, a first drive unit 50, a second drive unit 60, a temperature sensor 130 and a controller. A gear plate 30 is installed on the bearing seat 102 of the main roller shaft 101. The bearing seat 202 of the auxiliary roller shaft 201 is installed on the gear plate 30. The power supply unit 40 is used to apply a DC bias with opposite electrical properties to the main roller 10 and the auxiliary roller 20. The driving end of the first drive unit 50 is connected to the gear plate 30, which is used to drive the gear plate 30 to drive the auxiliary roller shaft 201 to rotate around the first direction to adjust the cooling wrap angle of the base film 70 on the main roller 10; wherein the first direction is the axial direction of the main roller 10. The second driving unit 60 drives the bearing seat 202 of the auxiliary roller shaft 201 to slide in the slide groove 602 of the gear plate 30, driving the auxiliary roller 20 to move along the second direction to adjust the axial distance between the main roller 10 and the auxiliary roller 20, wherein the second direction is the direction of the line connecting the axis of the main shaft 10 and the axis of the auxiliary roller 20. The detection end of the temperature sensor 130 faces the side of the main roller 10, and is used to detect the temperature of the base film 70 on the main roller 10. The controller transmits signals with the temperature sensor, the first driving unit and the second driving unit respectively. The temperature sensor 130 can convert the detected base film temperature into a temperature signal, and the controller obtains the temperature signal and controls the first driving unit 50 and the second driving unit 60 to work based on the temperature signal, adjusts the cooling wrap angle of the base film 70 on the main roller 10, and adjusts the adsorption force of the base film 70 on the main roller 10, wherein the adsorption force of the base film 70 on the main roller 10 is adjusted by adjusting the axial distance between the main roller 10 and the auxiliary roller 20, thereby adjusting the cooling effect of the main roller 10 on the base film 70.

[0044] Optionally, the main roller is made of stainless steel. The main roller has a flow channel for circulating cooling medium inside. The surface of the main roller has a thermally conductive and insulating ceramic layer to prevent the base film from directly contacting the main roller and igniting during the evaporation process. The first driving unit drives the shaft of the auxiliary roller to rotate around the first direction, so that the base film and the main roller form a certain cooling wrap angle, thereby ensuring the cooling area of ​​the base film.

[0045] Optionally, the auxiliary roller is made of conductive rubber, stainless steel, carbon fiber, and the like.

[0046] Optionally, the base film is made of one selected from polyethylene terephthalate (PET), polypropylene (PP), and polyimide (PI).

[0047] Optionally, the width of the base film is determined according to the length of the main roller.

[0048] Optionally, the composition of the metal film layer deposited on the base film is one selected from copper, aluminum, silver, nickel, molybdenum, titanium, niobium, iron, zinc, and stainless steel.

[0049] Optionally, the power supply unit includes a power supply, a first conductive member and a second conductive member, the main roller is electrically connected to the power supply via the first conductive member, and the auxiliary roller is electrically connected to the power supply via the second conductive member, wherein the auxiliary roller and the main roller have opposite charges.

[0050] Optionally, the first conductive brush and the second conductive brush are made of copper bolts and PVC insulating rubber blocks.

[0051] Optionally, the first conductive brush and the second conductive brush may be replaced by a first conductive slip ring and a second conductive slip ring, respectively.

[0052] Optionally, the base film after the metal film layer is deposited is first connected to the auxiliary roller for electrical conduction, so that the base film after the metal film layer is deposited and the main roller have opposite electrical properties. Due to the principle of opposites attracting each other, the base film after the metal film layer is deposited and the main roller are closely attached through the generated electrostatic adsorption force, thereby increasing the cooling effect.

[0053] Optionally, the DC bias voltages with opposite electrical properties applied to the main roller and the auxiliary roller have a value in the range of 0-600V.

[0054] Optionally, the cooling wrap angle of the base film on the main roller is continuously adjustable within the range of 120-320°, the adjustment range of the cooling wrap angle is 0-150°, and the adjustment accuracy is 0.01°.

[0055] Optionally, the adjustment range of the axial distance between the main roller and the auxiliary roller is 0-20 cm, and the adjustment accuracy is 0.05 mm.

[0056] Optionally, combined Figure 2 and Figure 3 As shown, there are two gear plates 30, which are respectively installed on the bearing seats at both ends of the main roller shaft 101. The first driving part 50 includes a gear shaft 501 and a first motor 502. The small gears at both ends of the gear shaft 501 are respectively meshed with the two gear plates 30. The driving end of the first motor 502 is connected to one end of the gear shaft 501 for driving the gear shaft 501 to rotate.

[0057] Optionally, the gear shaft is made of stainless steel.

[0058] Optionally, combined Figure 2 and Figure 3 As shown, the second driving unit 60 includes: a gear 601, a rack 603 and a second motor. The gear 601 is mounted on the bearing seat 202 of the auxiliary roller shaft, and the rack 603 is fixedly arranged on the gear plate 30, forming a gear rack transmission mechanism with the gear 601. The second motor drives the gear 601 to rotate, and drives the bearing seat 202 of the auxiliary roller shaft to slide in the slide groove 602 of the gear plate along the second direction through the gear rack transmission mechanism.

[0059] Optionally, the maximum stroke between the bearing seat of the auxiliary roller shaft and the slide groove is not less than 250 mm; the material of the inner wall of the slide groove is one of polytetrafluoroethylene and graphite.

[0060] Optionally, when the detected base film temperature is too high, the controller controls the first drive unit to increase the cooling wrap angle of the base film on the main roller. At the same time, the controller controls the second drive unit to reduce the axial distance between the auxiliary roller and the main roller, thereby increasing the adsorption force of the base film on the main roller and improving the cooling effect of the main roller on the base film.

[0061] Optionally, when the detected base film temperature is low, the controller controls the first drive unit to reduce the cooling wrap angle of the base film on the main roller. At the same time, the controller controls the second drive unit to increase the axial distance between the auxiliary roller and the main roller, thereby reducing the adsorption force of the base film on the main roller and reducing the cooling effect of the main roller on the base film.

[0062] Optionally, the temperature sensor is a laser temperature sensor, which is used to detect the temperature of the base film on the main roller and feed back a temperature signal of the detected base film temperature to the controller.

[0063] The present invention adjusts the adsorption force by adjusting the axial distance between the auxiliary roller and the main roller, which is a unique technical means, rather than by changing the bias value on the main roller or the auxiliary roller. The inventor has found that the magnitude of the adsorption force on the base film on the main roller is related to two factors: on the one hand, as generally known by technicians in the industry, it is caused by the electrostatic attraction between the roller surface of the main roller with positive bias and the surface of the base film with negative bias; on the other hand, it is caused by the inter-roller electric field component force along the radial direction of the roller surface, which is caused by the electric field force on the negatively charged base film on the roller surface of the main roller in the inter-roller electric field formed between the roller surface of the main roller with positive bias and the roller surface of the auxiliary roller with negative bias. Although this inter-roller electric field component force is not enough to change the bias electric field distributed on the flexible film mentioned above, it is an important component for the adsorption force on the base film on the main roller. According to research and analysis, the inter-roller electric field component force to which a certain micro-segment in the negatively charged base film on the surface of the main roller is subjected is proportional to the inter-roller electric field strength at the position of the micro-segment and sin(β), where β is the angle between the tangential direction of the micro-segment on the roller surface and the direction of the inter-roller electric field strength at the position of the micro-segment. When the axial spacing between the auxiliary roller and the main roller is reduced, the inter-roller electric field strength increases. At the same time, the inter-roller electric field is compressed and deformed, causing the angle β between the inter-roller electric field strength direction at the position of the micro-segment and the tangential direction of the micro-segment to increase, thereby increasing the inter-roller electric field component force to which the micro-segment is subjected. Therefore, the combined effects of each micro-segment increase the adsorption force on the base film on the main roller. When the axial distance between the auxiliary roller and the main roller increases, the electric field strength between the rollers decreases. At the same time, the electric field between the rollers is stretched and deformed, resulting in a decrease in the angle β between the electric field strength direction between the rollers at the micro-segment position and the tangential direction of the micro-segment, thereby reducing the electric field component between the rollers on which the micro-segment is subjected. Therefore, the combined effects of the micro-segments reduce the adsorption force on the base film on the main roller.

[0064] In the above embodiment, the adjustment of the adsorption force of the base film on the main roller is achieved by adjusting the spacing between the main roller and the auxiliary roller, rather than adjusting the bias value on the main roller or the auxiliary roller. By adjusting the spacing between the main roller and the auxiliary roller, the bias value on the main roller and the auxiliary roller is maintained unchanged while adjusting the adsorption force of the base film on the main roller, thereby maintaining the stability of the bias electric field distributed on the base film, avoiding the change of the bias electric field distributed on the surface of the base film due to the adjustment of the bias value on the main roller or the auxiliary roller, thereby causing the movement trend and film forming behavior of the metal film layer particles to change, and then causing the film layer microstructure of the length segment to be affected to varying degrees, so that the film layer performance and film material quality of the length segment and the previous length segment have different degrees of difference. On this basis, combined with the adjustment method of the present invention, the temperature of the base film attached to the main roller is kept stable during the entire vacuum winding coating process. In summary, the film forming quality of the metal film layer deposited on the base film can be guaranteed, and the film layer microstructure and product performance of the coating product can be guaranteed to be stable and consistent in the front and back sections of the coating production cycle.

[0065] In some embodiments, in combination Figure 4 As shown, the vacuum winding evaporation coating equipment includes the above-mentioned main roller system with adsorption adjustment function, a chamber 1 and an evaporator 2. Among them, the number of the main roller system with adsorption adjustment function is more than one; the evaporator is arranged below the main roller, and the number of the evaporator is more than one. Figure 2 As shown, the bearing seat of the main roller shaft is fixedly mounted on the wall panels 11 and 12 arranged in the cavity.

[0066] Optionally, the vacuum winding evaporation coating equipment further includes: a unwinding roller 80 , a first guide roller 90 , a flattening roller 100 , a second guide roller 110 and a winding roller 120 .

[0067] Optionally, the unwinding roller and the winding roller are made of stainless steel. The unwinding roller is an air expansion roller, which can be inflated and deflated to replace the winding core, and the rolled base film is unwound according to the film drawing direction. The winding roller is an air expansion roller, which can be inflated and deflated to replace the winding core, and the base film after the metal film layer is deposited is rolled into a cylindrical roll film.

[0068] Optionally, the flattening roller is made of a rubber roller, and is used to flatten the base film to reduce wrinkles on the base film.

[0069] In this embodiment, the base film 70 is guided by the unwinding roller into the first guide roller 90, and then guided by the first guide roller 90 into the flattening roller 100, and then the flattening roller 100 flattens the base film and guides it into the main roller 10. The evaporator 2 is used to deposit a metal film layer on the base film on the main roller to obtain the base film after the metal film layer is deposited. The base film after the metallized film layer is deposited passes through the auxiliary roller 20. Among them, the surfaces of the base film that contact the roller surface when it passes through the main roller and the auxiliary roller are two different surfaces of the base film. The power supply unit 40 applies a DC bias with opposite electrical properties to the main roller 10 and the auxiliary roller 20. When passing through the auxiliary roller 20, the metal film layer and the surface of the auxiliary roller 20 are tightly attached by tension, so that the base film after the metallized film layer is deposited has the same electrical properties as the auxiliary roller. Since the DC biases of the main roller 10 and the auxiliary roller 20 are of opposite electrical properties, the base film after the metallized film layer is deposited has a DC bias opposite to that of the main roller 10, and the base film on the main roller is tightly attached to the main roller by electrostatic adsorption. At the same time, the temperature sensor 130 is used to detect the temperature of the base film after the metal film layer is deposited on the main roller in real time, and based on the base film temperature, the gear plate 30 is driven by the first driving unit 50 to drive the roller shaft of the auxiliary roller 20 to rotate around the first direction to adjust the cooling wrap angle of the base film on the main roller 10, and the auxiliary roller 20 is driven to move along the second direction by the second driving unit 60 to adjust the axial spacing between the main roller 10 and the auxiliary roller 20, thereby adjusting the adsorption force of the base film on the main roller. In this device, by adjusting the cooling wrap angle of the base film on the main roller and adjusting the adsorption force of the base film on the main roller, the cooling effect of the base film on the main roller is adjusted, so that the temperature of the base film attached to the main roller remains stable and consistent throughout the vacuum winding coating process. The base film after the metal film layer is deposited is then guided to the second guide roller by the auxiliary roller, and then guided to the winding roller by the second guide roller, and rolled into a cylindrical film by the winding roller, completing the entire coating process of the vacuum winding evaporation coating equipment.

Claims

1. A main roller system with adsorption adjustment function, characterized in that: include: Main roller: a gear plate is installed on the bearing seat of the main roller shaft, and a slide groove is provided on the gear plate; Auxiliary roller, the bearing seat of the auxiliary roller shaft is installed on the gear plate; A power supply unit, which is used to apply a DC bias voltage with opposite electrical properties to the main roller and the auxiliary roller; A first driving unit, wherein a driving end of the first driving unit is connected to the gear plate, and is used to drive the gear plate to drive the roller shaft of the auxiliary roller to rotate around a first direction to adjust the cooling wrap angle of the base film on the main roller, wherein the first direction is the axial direction of the main roller; A second driving unit drives the bearing seat of the auxiliary roller shaft to slide in the slide groove of the gear plate, driving the auxiliary roller to move along a second direction to adjust the axial distance between the main roller and the auxiliary roller, wherein the second direction is the direction of the line connecting the axis center of the main roller and the axis center of the auxiliary roller; A temperature sensor for detecting the temperature of the base film on the main roller; A controller, the controller transmits signals to the temperature sensor, the first driving part and the second driving part respectively; The temperature sensor converts the detected base film temperature into a temperature signal. The controller obtains the temperature signal and controls the operation of the first drive unit and the second drive unit based on the temperature signal to adjust the cooling wrap angle of the base film on the main roller and the adsorption force of the base film on the main roller. The adsorption force of the base film on the main roller is adjusted by adjusting the axial distance between the main roller and the auxiliary roller, thereby adjusting the cooling effect of the main roller on the base film.

2. The main roller system with adsorption adjustment function according to claim 1, characterized in that: The DC bias voltage with opposite electrical properties applied by the main roller and the auxiliary roller ranges from 0 to 600V; the cooling wrap angle of the base film on the main roller is continuously adjustable in the range of 120-320°, the adjustment range of the cooling wrap angle is 0-150°, and the adjustment accuracy is 0.01°; the adjustment range of the axial spacing between the main roller and the auxiliary roller is 0-20cm, and the adjustment accuracy is 0.05mm.

3. The main roller system with adsorption adjustment function according to claim 1, characterized in that: There are two gear plates, which are respectively mounted on the bearing seats at both ends of the main roller shaft; the first driving part includes: A gear shaft, wherein the pinions at both ends of the gear shaft are respectively meshed with the two gear plates; A first motor, wherein a driving end of the first motor is connected to one end of the gear shaft, and is used for driving the gear shaft to rotate.

4. The main roller system with adsorption adjustment function according to claim 1 is characterized in that: The second driving unit comprises: The gear is mounted on the bearing seat of the auxiliary roller shaft; The rack is fixed on the gear plate and forms a rack-and-pinion transmission mechanism with the gear; The second motor drives the gear to rotate, and drives the bearing seat of the auxiliary roller shaft to slide in the sliding groove of the gear plate along the second direction through the gear rack transmission mechanism.

5. The main roller system with adsorption adjustment function according to claim 4, characterized in that: The maximum stroke between the bearing seat of the auxiliary roller shaft and the slideway is not less than 250 mm; the material of the inner wall of the slideway is one of polytetrafluoroethylene and graphite.

6. The main roller system with adsorption adjustment function according to claim 1, characterized in that: When the detected base film temperature is too high, the controller controls the first drive unit to increase the cooling wrap angle of the base film on the main roller. At the same time, the controller controls the second drive unit to reduce the axial distance between the auxiliary roller and the main roller, thereby increasing the adsorption force of the base film on the main roller and improving the cooling effect of the main roller on the base film.

7. The main roller system with adsorption adjustment function according to claim 1, characterized in that: When the detected base film temperature is too low, the controller controls the first drive unit to reduce the cooling wrap angle of the base film on the main roller. At the same time, the controller controls the second drive unit to increase the axial distance between the auxiliary roller and the main roller, thereby reducing the adsorption force of the base film on the main roller and reducing the cooling effect of the main roller on the base film.

8. The main roller system with adsorption adjustment function according to claim 1, characterized in that: The power supply department includes: power supply; A first conductive member, through which the main roller is electrically connected to a power source; The auxiliary roller is electrically connected to the power source through the second conductive member.

9. A vacuum winding evaporation coating device, characterized in that: include: The main roller system with adsorption adjustment function according to any one of claims 1 to 8; wherein the number of the main roller systems with adsorption adjustment function is more than one; A cavity, a main roller system with an adsorption adjustment function is arranged in the cavity; and, There are more than one evaporator, and the evaporator is arranged below the main roller.

10. The vacuum winding evaporation coating equipment according to claim 9, characterized in that: It also includes an unwinding roller, a first guide roller, a flattening roller, a second guide roller and a winding roller.

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