Radiant heating and baking process of coated films and oven equipment

Abstract

The application relates to a radiation heating baking process and an oven device for a coated film. The radiation heating baking process comprises the following steps: a radiation heating assembly in a heating cavity of a main oven is used to heat the coated film, so that the coated film is heated to a first temperature; meanwhile, a fan in a sub-oven continuously works to ventilate the heating cavity, the temperature of the gas ventilated in the heating cavity is a second temperature, and the second temperature is lower than the first temperature; the gas discharged from the heating cavity enters a gas-gas heat exchanger in the sub-oven, and is heat-exchanged with the gas to be introduced into the heating cavity in the gas-gas heat exchanger. The oven device comprises a main oven for baking the coated film and a sub-oven for feeding and discharging the main oven. The coated film is heated by radiation, ventilation is carried out at a temperature lower than the temperature of the film material, and waste gas is heat-recovered, so that the baking efficiency is improved, the temperature of the whole machine is reduced, the energy consumption is reduced, and energy saving is realized.

Description

Technical Field

[0001] This application relates to the field of coating film baking technology, and in particular to a radiation heating baking process and oven equipment for coating films. Background Technology

[0002] In the battery manufacturing process, the processing of film materials such as positive electrode film, negative electrode film, and separator requires coating. The coating process involves uniformly applying liquid or molten coating materials to the surface of the substrate. After coating, a baking process is often required to allow the coating to adhere quickly to the substrate, thus achieving the industrial production requirements.

[0003] Currently, the baking of coated films primarily uses hot air baking. This method uses the atmosphere as a heat transfer medium, heating the film through heat conduction and convection, causing the solvent to evaporate into the atmosphere, which is then carried away by the exhaust. This method requires heating the atmosphere to a temperature higher than the temperature at which the solvent evaporated from the coating film, ensuring continuous heat transfer. Furthermore, some heat is lost during the process of preheating the atmosphere before it reaches the oven, which must be compensated for by heating the atmosphere. This results in high operating temperatures for the entire machine, with all the heat emitted with the exhaust gas. For an industrial production facility, this leads to significant energy consumption. Additionally, the high-temperature exhaust creates a poor working environment and poses safety hazards. Moreover, this method heats the coating film from the surface inwards, causing uneven drying and resulting in surface cracking, affecting product quality. The long drying time also necessitates a longer oven, increasing space costs. Summary of the Invention

[0004] Based on this, this application provides a radiation heating baking process and oven equipment for coated films to solve the above problems.

[0005] The technical solution adopted in this application is as follows:

[0006] A radiation heating baking process for a coated film includes the following steps: a radiation heating component in the heating chamber of a baking main chamber heats the coated film to a first temperature, while a fan in a baking auxiliary chamber continuously operates to ventilate the heating chamber, the temperature of the gas ventilated into the heating chamber being a second temperature, which is lower than the first temperature; the gas discharged from the heating chamber enters a gas-to-gas heat exchanger in the baking auxiliary chamber, where it exchanges heat with the gas that is about to enter the heating chamber.

[0007] Furthermore, the second temperature is 10 to 40 degrees Celsius lower than the first temperature.

[0008] Furthermore, the first temperature is 110 to 150 degrees Celsius, and the second temperature is 70 to 110 degrees Celsius.

[0009] Furthermore, the process includes the step of: the roller assembly inside the baking chamber pulling the coated film through the heating chamber.

[0010] Furthermore, the method also includes the step of maintaining a slight negative pressure within the heating chamber, wherein the slight negative pressure is -10 to -50 Pa.

[0011] An oven apparatus is provided for operating a radiative heating baking process for a coated film as described above. The oven apparatus includes a main baking chamber for baking the coated film and a secondary baking chamber for intake and exhaust of the main baking chamber. The main baking chamber includes a wind box, a heating chamber, a radiative heating component, and a roller assembly. The air inlet and outlet of the wind box are isolated. The air inlet of the wind box is connected to the heating chamber via a nozzle assembly, and the heating chamber is also connected to the air outlet of the wind box. The radiative heating component and the roller assembly are disposed within the heating chamber. The roller assembly is used to pull the coated film through the heating chamber, and the radiative heating component is used to heat the coated film. The secondary baking chamber is provided with a fan and a gas-to-gas heat exchanger. The gas-to-gas heat exchanger is used to exchange heat between fresh air and exhaust gas. The fresh air is the gas that will enter the wind box from the air inlet, and the exhaust gas is the gas that will exit the heating chamber from the air outlet. The fan is used to blow the fresh air after passing through the gas-to-gas heat exchanger into the wind box.

[0012] Furthermore, the radiant heating assembly includes a plurality of infrared radiant heating plates, which are evenly spaced along the length of the heating cavity.

[0013] Furthermore, the radiant heating assembly also includes a plurality of exhaust pipes, each of which is correspondingly arranged with a plurality of infrared radiant heating plates. The exhaust pipes are disposed on the air box, with one end of the exhaust pipe connected to the heating cavity and close to the end of the infrared radiant heating plate facing away from the coating film, and the other end connected to the air outlet of the air box.

[0014] Furthermore, the baking auxiliary chamber has an air distribution chamber, a fan chamber, and a filter chamber. The air distribution chamber is equipped with the gas-to-gas heat exchanger, the fan chamber is equipped with the fan, and the filter chamber is equipped with a filter. The exhaust gas inlet of the gas-to-gas heat exchanger is connected to the air distribution chamber, the fresh air outlet of the gas-to-gas heat exchanger is connected to the fan chamber, the air inlet of the fan is connected to the fan chamber, the air outlet of the fan is connected to the filter chamber, the air distribution chamber is connected to the air outlet of the air box, and the filter chamber is connected to the air inlet of the air box.

[0015] Furthermore, several air intake guide plates are provided inside the air box directly opposite the air inlet, and several exhaust guide plates are provided inside the air box directly opposite the air outlet.

[0016] The technical effect of the technical solution in this application is as follows:

[0017] The radiation heating baking process and oven equipment for coated film of this application involve passing the coated film through a heating chamber, where the coated film is radiantly heated by a radiation heating component. The baking auxiliary box ventilates the heating chamber, and after the coated film is heated, the solvent evaporates into the gas and is discharged from the heating chamber with the gas, thereby achieving the drying of the coated film.

[0018] The coating film is heated by thermal radiation, which allows energy to penetrate the surface to a certain depth, so that the inside and outside are heated at the same time. Compared with the traditional baking method of heat transfer from the outer layer to the inner layer, it can avoid the product quality problem of outer layer cracking due to the outer layer drying first. Moreover, thermal radiation heating heats up faster, so the length of the oven can be reduced, thus avoiding the oven being too long and occupying a lot of space.

[0019] The temperature of the coating film after radiation heating is the first temperature, and the temperature of the gas introduced into the heating chamber is the second temperature. The second temperature is lower than the first temperature. Compared with the traditional hot air baking method, since the gas does not need to transfer heat to the coating film, the required temperature of the gas is reduced, the overall temperature of the machine is reduced, and the energy consumption is greatly reduced, thus achieving energy saving. Moreover, when the solvent on the coating film evaporates, since the gas temperature is lower than the liquid temperature, the solvent evaporation is promoted, which improves the baking efficiency.

[0020] The gas-to-gas heat exchanger exchanges heat between the gas discharged from the heating chamber and the gas about to enter the heating chamber, realizing heat recovery and further enhancing the energy-saving effect. The temperature of the gas in the heating chamber is already lower than the temperature of the gas baked by traditional hot air. After heat exchange, the gas temperature is further reduced. After the gas is discharged and mixed with the atmosphere, it will cool down. Therefore, the exhaust gas is basically not dangerous to the human body. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a frontal view of the internal structure of the baking oven, as shown in the embodiment of this application.

[0023] Figure 2 for Figure 1Enlarged view of point A in the middle;

[0024] Figure 3 This is a top view of the internal structure of the baking auxiliary box, as shown in the embodiment of this application.

[0025] Figure 4 This is a structural schematic diagram illustrating the position and shape of the air intake guide plate of the wind box in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 11a. Upper air box; 11b. Lower air box; 111. Inlet chamber; 112. Exhaust chamber; 1131. Nozzle; 114. Air box inlet valve; 115. Air box exhaust valve; 116. Inlet guide plate; 117. Exhaust guide plate; 118. Drain pipe; 12. Heating chamber; 131. Radiant heating plate; 132. Exhaust pipe; 141. Roller; 21. Air distribution chamber; 211. Gas-to-gas heat exchanger; 212. External exhaust valve; 213. Inlet valve; 22. Fan chamber; 221. Fan; 23. Filter chamber; 231. Filter; 30. Coated membrane. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. This application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] In the battery manufacturing process, the coating material needs to be baked after coating. Baking can accelerate the evaporation of solvents in the coating to achieve the goal of rapid industrial production. At present, the drying of coating materials is mainly carried out by hot air baking. This requires the temperature of the hot air to be higher than the temperature of the coated film in order to transfer heat to the coated film. This makes the overall operating temperature of the drying oven equipment higher than the temperature at which the solvent evaporates (generally around 110-130℃). Such long-term operation of the drying oven equipment results in huge energy consumption, and the high temperature of the hot air discharged from the oven can pose a danger to human health.

[0034] Based on the above considerations, this application provides a radiation heating baking process and oven equipment for coated films, which can reduce the overall operating temperature of the oven equipment, improve baking efficiency, and recover heat to achieve energy-saving, efficient, and safe production.

[0035] refer to Figures 1 to 4 This application provides a radiation heating baking process for a coated film, including the following steps:

[0036] S10. The radiant heating component in the heating chamber 12 heats the coating film 30, raising the temperature of the coating film 30 to a first temperature. At the same time, the fan 221 in the baking auxiliary box continues to work to ventilate the heating chamber 12. The temperature of the gas ventilated into the heating chamber 12 is a second temperature, which is lower than the first temperature.

[0037] It should be noted that since the temperature of a substance is not completely uniform in different places, the temperatures mentioned above and below refer to the average temperature of the substance.

[0038] Preferably, the second temperature is 10-40°C lower than the first temperature. For most coated films 30 in the current battery manufacturing industry, the baking temperature is generally in the range of 110-150°C. In current experiments, it has been found that when the gas temperature is controlled to be 10-40°C lower than the temperature of the coated film 30 during ventilation, the product is less likely to crack. If the temperature difference is further reduced, the coating is likely to experience thermal expansion and contraction or condensation, leading to product cracking.

[0039] Preferably, with the second temperature being 10-40°C lower than the first temperature, the coating film 30 is heated to 110-150°C, and the gas temperature inside the heating chamber 12 is 70-110°C. First, the first temperature of the coating film 30 is determined, then the second temperature of the gas inside the heating chamber 12 is selected. For example, if the coating film 30 needs to be heated to 130°C, the gas temperature inside the heating chamber 12 can be set to 90-120°C; or, if the coating film 30 needs to be heated to 150°C, the gas temperature inside the heating chamber 12 can be set to 110°C.

[0040] Furthermore, the second temperature is 10-20°C lower than the first temperature to minimize product cracking while still achieving good energy savings. In actual baking production, the temperature difference between the coating film 30 and the gas should be precisely selected based on the specific coating composition, taking into account the coating's thermal expansion and contraction and condensation properties, to ensure the product does not crack.

[0041] Preferably, with the second temperature being 10-20°C lower than the first temperature, the coating film 30 is heated to 110-150°C, and the gas temperature inside the heating chamber 12 is 90-130°C. First, the first temperature of the coating film 30 is determined, then the second temperature of the gas inside the heating chamber 12 is selected. For example, if the coating film 30 needs to be heated to 115°C, the gas temperature inside the heating chamber 12 can be set to 95-105°C; or, if the coating film 30 needs to be heated to 150°C, the gas temperature inside the heating chamber 12 can be set to 130°C.

[0042] When the coating film 30 is at 110 to 150 degrees Celsius, the solvent is easily volatile. In addition, the temperature of the gas is lower than that of the solvent, which also promotes solvent evaporation, resulting in high baking efficiency. The gas temperature is 10 to 40 degrees Celsius lower than the temperature of the coating film 30, which reduces the overall operating temperature of the equipment and makes the product less prone to cracking. The gas temperature in the heating chamber 12 is 10 to 40 degrees Celsius lower than the temperature of the coating film 30, whereas previously the gas temperature had to be 3 to 5 degrees Celsius higher than the coating film to ensure continuous heating of the film material. Therefore, the overall operating temperature of the equipment can be reduced by ten to forty degrees Celsius, resulting in significant energy savings during long-term operation of the equipment.

[0043] Specifically, the coating film 30 is heated by several infrared radiation heating plates 131 evenly distributed along the length of the heating cavity 12 of the radiation heating assembly. The coating film 30 is located below the infrared radiation heating plates 131, and the distance between the infrared radiation heating plates 131 and the coating film 30 is adjusted by adjusting the height of the infrared radiation heating plates 131 to suit the baking of various types of coating films 30. Infrared light is used as the radiation source, and the energy can penetrate the surface to a certain depth, so that the inside and outside are heated at the same time. Compared with the traditional baking method of heat transfer from the outer layer to the inner layer, it can avoid the product quality problem of outer layer cracking due to the outer layer drying first. Moreover, the heat radiation heating is faster, so the length of the oven can be reduced, thereby avoiding the oven length being too long and occupying a lot of space. Radiation heating reduces heat conversion links and improves energy utilization.

[0044] S20: The gas discharged from the heating chamber 12 enters the gas-to-gas heat exchanger 211 in the baking auxiliary chamber, where it exchanges heat with the gas that is about to enter the heating chamber 12. Step S20 is performed while "ventilating the heating chamber 12" in step S10.

[0045] Specifically, the gas discharged from the heating chamber 12 (i.e., exhaust gas) enters the uniform air chamber 21 in the baking auxiliary chamber. The gas-to-gas heat exchanger 211 is installed in the uniform air chamber 21. The gas-to-gas heat exchanger 211 draws the exhaust gas in the uniform air chamber 21 and exchanges heat with the outside atmosphere. After the heat exchange, the exhaust gas is directly discharged, while the atmosphere (i.e., fresh air) enters the fan chamber 22. Then, the fan 221 in the fan chamber 22 sends the air into the air box of the baking main chamber. The air is evenly distributed in the heating chamber 12 through the air nozzle assembly of the air box, and finally discharged into the uniform air chamber 21 in the baking auxiliary chamber through the air box. In this way, the gas circulation of the oven equipment is completed, that is, the ventilation of the heating chamber 12 is completed.

[0046] In actual production, the temperature of the gas inside the heating chamber 12 is generally between 70 and 130 degrees Celsius. With the selection of a suitable and efficient gas-to-gas heat exchanger 211 and the fresh air temperature being room temperature, the temperature of the exhaust gas can be kept between 40 and 50 degrees Celsius. The exhaust gas will also cool down after mixing with the atmosphere, so the exhaust gas is basically not dangerous to the human body.

[0047] The coating film 30 is heated by a radiant heating plate 131, and the temperature of the gas inside the heating chamber 12 is lower than that of the coating film. This firstly reduces the energy consumption required for heating the gas, and the main energy supply is changed from the original oil and gas supply to an electric supply. In long-term production, the energy saving effect is significant and more environmentally friendly. After the main energy supply is changed to an electric supply, the material cost of pipeline laying is greatly reduced, and the size of the equipment is also reduced. Then, the exhaust gas of this equipment is already lower in temperature than the exhaust gas emitted by traditional hot air baking. After heat exchange by the gas-to-gas heat exchanger 211, the temperature of the exhaust gas is further reduced, and the exhaust gas is no longer dangerous after being discharged. In addition, the gas-to-gas heat exchanger 211 exchanges heat between the exhaust gas and the fresh air that will enter the heating chamber 12, realizing heat recovery and further enhancing the energy saving effect.

[0048] More specifically, the fresh air passes through the air inlet valve 114 at the air inlet of the air box, then through several air inlet guide plates 116 into the intake chamber 111, which is wider at the front and narrower at the back. From the intake chamber 111, it passes through several nozzles 1131 evenly spaced along the length of the heating chamber 12 into the heating chamber 12. From the rear of the heating chamber 12, it enters the exhaust chamber 112, which is wider at the front and narrower at the back. Finally, it passes through several exhaust guide plates 117 into the air box exhaust valve 115 at the air outlet, and then through the exhaust valve 115 into the uniform air chamber 21 within the baking auxiliary chamber. In the air box, the intake chamber 111 and the exhaust chamber 112 are separated by an inclined partition, primarily to create a space wider at the front and narrower at the back in the intake chamber 111, thus ensuring consistent airflow from each nozzle 1131 in the nozzle assembly.

[0049] Furthermore, in addition to entering the exhaust chamber 112 from the rear of the heating chamber 12, the gas in the heating chamber 12 can also enter the exhaust chamber 112 from several exhaust pipes 132 of the radiant heating assembly. In the heating chamber 12, several exhaust pipes 132 are arranged in a one-to-one correspondence with several infrared radiant heating plates 131. The exhaust pipes 132 are mounted on the ventilation box. One end of the exhaust pipe 132 is connected to the heating chamber 12 and is close to the end of the infrared radiant heating plate 131 facing away from the coating film 30; the other end is connected to the exhaust chamber 112 of the ventilation box. This prevents airflow backflow when exhausting gas from the heating chamber 12. Furthermore, the gas temperature is lower than the temperature of the infrared radiant heating plate 131, allowing the gas to cool the radiant heating plate 131 as it passes through. The airflow also cleans the radiant heating plate 131, thereby extending its service life.

[0050] Furthermore, after heat exchange in the gas-to-gas heat exchanger 211, the exhaust gas is discharged from the exhaust port valve 212 on the uniform air chamber 21. The opening of the exhaust port valve 212 is adjusted according to the solvent concentration and temperature of the oven to control the exhaust gas discharge rate. External air enters the gas-to-gas heat exchanger 211 through the air inlet valve 213 on the uniform air chamber 21. The opening of the air inlet valve 213 is adjusted according to the solvent concentration and temperature of the oven to control the fresh air intake rate. After heat exchange, the fresh air enters the fan chamber 22 in the baking auxiliary box and is drawn into the air box by the fan 221.

[0051] Furthermore, the fan 221 simultaneously draws in the fresh air and the exhaust gas entering the fan chamber 22 from the air distribution chamber 21 and sends them into the heating chamber 12. The air distribution chamber 21 is connected to the fan chamber 22. The fresh air and part of the exhaust gas mix in the fan chamber 22. Although the exhaust gas contains solvent, the solvent concentration is very low after the exhaust gas is mixed with the fresh air, and the higher temperature of the exhaust gas can increase the temperature of the mixed gas.

[0052] Furthermore, the fan 221 draws the gas into the filter chamber 23 inside the baking sub-box, and the gas enters the air box after being filtered by the filter chamber 23.

[0053] S30: The roller 141 assembly in the baking chamber pulls the coated film 30 through the heating chamber 12. Step S30 is performed simultaneously with steps S10 and S20.

[0054] Specifically, the coated film 30 passes under the nozzle assembly and the radiant heating assembly; a plurality of nozzles 1131 of the nozzle assembly and a plurality of radiant heating plates 131 of the radiant heating assembly are arranged alternately in the length direction of the heating cavity 12; a plurality of rollers 141 of the roller assembly are distributed at intervals along the length direction of the heating cavity 12, with one roller 141 provided every 2 or 3 nozzles 1131, and the rollers 141 are directly below the nozzles 1131; the roller assembly is driven by an external force to pull the coated film 30 in a straight line under the nozzle assembly and the radiant heating assembly.

[0055] Furthermore, the coating film 30 passes in a straight line through the vertical gap between the nozzle assembly of the upper air box 11a and the nozzle assembly of the lower air box 11b; the upper air box 11a and the lower air box 11b are connected and the connection point encloses the heating cavity 12. The upper air box 11a and the lower air box 11b have the same structure and are symmetrically installed with the heating cavity 12 as the center line. The arrangement of the nozzle assembly of the upper air box 11a and the radiant heating assembly is as described above, except that the nozzles 1131 of the upper air box 11a and the nozzles 1131 of the lower air box 11b are also arranged alternately in the length direction of the heating cavity 12. The nozzles 1131 of the lower air box 11b are directly below the radiant heating plate 131. The roller assembly pulls the coating film 30 in a straight line through the vertical gap between the nozzle assemblies of the upper air box 11a and the lower air box 11b.

[0056] S40. Maintain a slight negative pressure within the heating chamber 12, the slight negative pressure being -10 to -50 Pa. Step S40 is performed simultaneously with steps S10, S20, and S30. This ensures negative pressure isolation within the heating chamber 12, preventing solvent leakage.

[0057] Furthermore, the airflow with a slight negative pressure formed in the heating chamber 12 is led to the fan chamber 22 through the guide pipe 118.

[0058] This application also provides an oven apparatus for operating the radiation heating baking process of the coated film 30 as described above.

[0059] Please refer to Figures 1 to 3 The oven equipment includes a main baking chamber for baking the coated film 30 and a secondary baking chamber for air intake and exhaust of the main baking chamber. The main baking chamber includes a wind box, a heating chamber 12, a radiant heating assembly, and a roller assembly. The air inlet and outlet of the wind box are isolated. The air inlet of the wind box is connected to the heating chamber 12 through a nozzle assembly, and the heating chamber 12 is also connected to the air outlet of the wind box. The radiant heating assembly and the roller assembly are disposed within the heating chamber 12. The roller assembly is used to pull the coated film 30 through the heating chamber 12, and the radiation heating assembly is used to heat the coated film 30. The baking auxiliary box is equipped with a fan 221 and a gas-to-gas heat exchanger 211. The gas-to-gas heat exchanger 211 is used to exchange heat between fresh air and exhaust gas. The fresh air is the gas that will enter the air box from the air inlet, and the exhaust gas is the gas that will exit the heating chamber 12 from the air outlet. The fan 221 is used to blow the fresh air after passing through the gas-to-gas heat exchanger 211 into the air box.

[0060] For details, please refer to Figure 1Inside the baking chamber, a blower is positioned above the heating chamber 12. The blower is divided into an air inlet chamber 111 and an exhaust chamber 112 by an inclined partition. The air inlet chamber 111 and the exhaust chamber 112 are shaped with a larger head and a smaller tail. The head of the air inlet chamber 111 has an air inlet connected to the fan 221. The air inlet chamber 111 is connected to the heating chamber 12 via a nozzle assembly. The nozzle assembly includes several nozzles 1131 that extend out of the heating chamber 12 and are evenly spaced along the length of the heating chamber 12. The head of the exhaust chamber 112 is connected to the tail of the heating chamber 12. The head of the exhaust chamber 112 has an exhaust port connected to the air exchanger. Heater 211; The radiant heating assembly includes a plurality of radiant heating plates 131 evenly spaced along the length of the heating cavity 12, a plurality of air nozzles 1131 of the air nozzle assembly and a plurality of radiant heating plates 131 of the radiant heating assembly are arranged alternately along the length of the heating cavity 12, and a roller assembly is located below the air nozzle assembly and the radiant heating assembly. The roller assembly includes a plurality of rollers 141 also spaced along the length of the heating cavity 12, with one roller 141 provided every 2 or 3 air nozzles 1131, and the rollers 141 are located directly below the air nozzles 1131. The roller assembly is driven by an external force to pull the coated film 30 in a straight line past the air nozzle assembly and the radiant heating assembly.

[0061] In this embodiment, reference Figure 1 The system has two air boxes: an upper air box 11a and a lower air box 11b. The upper air box 11a and the lower air box 11b are connected and their connection forms the heating cavity 12. The upper air box 11a and the lower air box 11b have the same structure and are symmetrically installed with the heating cavity 12 as the center line. The arrangement of the nozzle assembly of the upper air box 11a and the radiant heating assembly is as described above, except that the nozzles 1131 of the upper air box 11a and the lower air box 11b are also arranged alternately along the length of the heating cavity 12. The nozzles 1131 of the lower air box 11b are directly below the radiant heating plate 131. The roller assembly pulls the coating film 30 in a straight line through the vertical gap between the nozzle assemblies of the upper air box 11a and the lower air box 11b, thus ensuring that the coating film 30 passes smoothly on the roller assembly.

[0062] Furthermore, the height of the radiant heating plate 131 is adjustable, and the distance between the radiant heating plate 131 and the coating film 30 can be adjusted by adjusting the height of the radiant heating plate 131, so as to be suitable for baking various types of coating films 30.

[0063] In this embodiment, the radiant heating plate 131 is an infrared radiant heating plate 131.

[0064] In this embodiment, reference Figure 1 and Figure 2The radiant heating assembly also includes several exhaust pipes 132, each corresponding to one of the infrared radiant heating plates 131. The exhaust pipes 132 are mounted on the upper air box 11a. One end of each exhaust pipe 132 connects to the heating chamber 12 and is located near the end of the infrared radiant heating plate 131 facing away from the coating film 30. The other end connects to the exhaust chamber 112 of the upper air box 11a. Exhaust gas is discharged through the exhaust pipes 132 without causing airflow backflow. Furthermore, the gas temperature is lower than that of the infrared radiant heating plates 131, allowing the gas to cool the plates as it passes through them. The airflow also cleans the plates, thus extending their service life.

[0065] Furthermore, refer to Figure 3 The baking chamber includes an air distribution chamber 21, a fan chamber 22, and a filter chamber 23. The air distribution chamber 21 houses the gas-to-gas heat exchanger 211, the fan chamber 22 houses the fan 221, and the filter chamber 23 houses the filter 231. A drain pipe 118 is installed on the heating chamber 12 and connects to the fan chamber 22, maintaining a slight negative pressure in the heating chamber 12 through the drain pipe 118. The exhaust gas inlet of the gas-to-gas heat exchanger 211 is connected to... The air distribution cavity 21 is connected to the fresh air outlet of the air-to-air heat exchanger 211, the air inlet of the fan 221 is connected to the fan cavity 22, the air outlet of the fan 221 is connected to the filter cavity 23, the air distribution cavity 21 is connected to the air outlets of the upper air box 11a and the lower air box 11b, the filter cavity 23 is connected to the air inlets of the upper air box 11a and the lower air box 11b, and the air distribution cavity 21 is also connected to the fan cavity 22.

[0066] The circulating ventilation process of the oven equipment in this application is as follows: part of the gas in the heating chamber 12 enters the exhaust chamber 112 of the upper air box 11a through the exhaust pipe 132, and another part enters the exhaust chambers 112 of the upper air box 11a and the lower air box 11b from the tail of the heating chamber 12. Then, it enters the uniform air chamber 21 from the air outlet on the exhaust chambers 112 of the upper air box 11a and the lower air box 11b. The gas-gas heat exchanger 211 simultaneously draws out the waste gas in the uniform air chamber 21 and draws out the outside atmosphere, thus exchanging heat between the two gases. After the exhaust gas is cooled, it is directly discharged into the air distribution chamber 21. After the atmosphere is heated, it is discharged into the fan chamber 22. Since the air distribution chamber 21 is also connected to the fan chamber 22, some of the exhaust gas in the air distribution chamber 21 enters the fan chamber 22. Thus, the fan chamber 22 contains a mixture of atmosphere and some exhaust gas. Then the fan 221 sends the mixture into the filter chamber 23. After being filtered by the filter 231, the gas enters its respective air intake chamber 111 from the air inlets of the upper air box 11a and the lower air box 11b, and then enters the heating chamber 12 through its respective nozzle assembly.

[0067] Further, refer to Figure 1Air inlet valves 114 are provided at the air inlets of the upper air box 11a and the lower air box 11b, and several air inlet guide plates 116 are provided in the air inlet chamber 111 directly opposite the air inlet valves 114; air outlet valves 115 are provided at the air outlets of the upper air box 11a and the lower air box 11b, and several exhaust guide plates 117 are provided in the air inlet chamber 111 directly opposite the exhaust valves 115; please refer to Figure 4 , Figure 4 The position and shape of the air inlet guide plate 116 at the air inlet of the air box are shown, and the exhaust guide plate 117 at the air outlet of the air box is also provided. The air inlet guide plate 116 and the exhaust guide plate 117 are L-shaped plates with arc bends at the corners. In this way, the air speed of the nozzles 1131 of the upper air box 11a and the lower air box 11b can be controlled by adjusting the air box inlet valve 114 and the air box exhaust valve 115, so that the coating film 30 is stably attached to the roller 141. The air inlet guide plate 116 and the exhaust guide plate 117 can ensure smooth and uniform gas flow.

[0068] Further details can be found by referring to... Figure 3 The uniform air chamber 21 is equipped with an exhaust valve 212 and an inlet valve 213. The exhaust valve 212 is connected to the exhaust gas outlet of the gas-to-gas heat exchanger 211, and the inlet valve 213 is connected to the fresh air inlet of the gas-to-gas heat exchanger 211. The opening degree of the exhaust valve 212 is adjusted according to the solvent concentration and temperature of the oven to control the exhaust gas discharge rate, and the opening degree of the inlet valve 213 is adjusted according to the solvent concentration and temperature of the oven to control the fresh air intake rate.

[0069] The aforementioned drying oven is a single-unit structure. Depending on the product and process requirements, multiple units can be connected in a straight line. The connection points are sealed. At both ends of the overall structure, a narrow slit is left at the position where the coating film enters and exits 30mm for material feeding and discharging. The slit is set with negative pressure to isolate the internal environment of the oven from the outside environment and prevent solvent leakage.

[0070] The radiation heating baking process and oven equipment for the coated film 30 of this application allow the coated film 30 to pass through the heating chamber 12, where it is radiated and heated by a radiation heating component. The baking auxiliary oven ventilates the heating chamber 12, and after the coated film 30 is heated, the solvent evaporates into the gas and is discharged from the heating chamber 12 with the gas, thereby achieving the drying of the coated film 30.

[0071] The coating film 30 is heated by thermal radiation, which allows energy to penetrate the surface to a certain depth, so that the inside and outside are heated at the same time. Compared with the traditional baking method of heat transfer from the outer layer to the inner layer, it can avoid the product quality problem of outer layer cracking due to the outer layer drying first. Moreover, thermal radiation heating heats up faster, so the length of the oven can be reduced, thereby avoiding the oven being too long and occupying a lot of space.

[0072] The temperature of the coated film 30 after radiation heating is the first temperature, and the temperature of the gas introduced into the heating chamber 12 is the second temperature. The second temperature is lower than the first temperature. Compared with the traditional hot air baking method, since the gas does not need to transfer heat to the coated film 30, the required temperature of the gas is reduced, the overall temperature of the machine is reduced, and the energy consumption is greatly reduced, thus achieving energy saving. Moreover, when the solvent on the coated film 30 evaporates, since the gas temperature is lower than the liquid temperature, it can promote solvent evaporation and improve baking efficiency.

[0073] The gas-to-gas heat exchanger 211 exchanges heat between the gas discharged from the heating chamber 12 and the gas that is about to enter the heating chamber 12, thereby realizing heat recovery and further enhancing the energy-saving effect. The temperature of the gas in the heating chamber 12 is already lower than the temperature of the gas baked by traditional hot air. After heat exchange, the gas temperature is further reduced, and the gas discharge is no longer dangerous.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above merely illustrate several implementation methods of this application and should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An oven apparatus, characterized by, The oven device comprises an oven main box for baking the coated film and an oven auxiliary box for air intake and exhaust of the oven main box; The oven main box comprises a wind box, a heating cavity, a radiation heating assembly and a roller assembly, the air inlet and the air outlet of the wind box are isolated, the air inlet of the wind box is communicated with the heating cavity through a tuyere assembly, the heating cavity is also communicated with the air outlet of the wind box, the radiation heating assembly and the roller assembly are arranged in the heating cavity, the roller assembly is used to pull the coated film through the heating cavity, and the radiation heating assembly is used to heat the coated film; The oven auxiliary box is provided with a fan and an air-air heat exchanger, the air-air heat exchanger is used to exchange heat between fresh air and exhaust air, the fresh air is the gas to be introduced into the wind box from the air inlet, and the exhaust air is the gas discharged from the heating cavity through the air outlet, and the fan is used to blow the fresh air after the air-air heat exchanger into the wind box; The radiation heating assembly comprises a plurality of infrared radiation heating plates; The radiation heating assembly further comprises a plurality of exhaust pipes, the plurality of exhaust pipes are arranged one by one corresponding to the plurality of infrared radiation heating plates, the exhaust pipes are arranged on the wind box, one end of the exhaust pipe is communicated with the heating cavity and close to one end of the infrared radiation heating plate away from the coated film, and the other end is communicated with the air outlet of the wind box.

2. Oven apparatus according to claim 1, characterized in that The plurality of infrared radiation heating plates are uniformly distributed along the length direction of the heating cavity.

3. The oven apparatus of claim 1, wherein, The oven auxiliary box has a uniform air chamber, a fan chamber and a filter chamber, the air-air heat exchanger is arranged in the uniform air chamber, the fan is arranged in the fan chamber, and the filter is arranged in the filter chamber; The exhaust air inlet end of the air-air heat exchanger is communicated with the uniform air chamber, the fresh air outlet end of the air-air heat exchanger is communicated with the fan chamber, the air inlet end of the fan is communicated with the fan chamber, the air outlet end of the fan is communicated with the filter chamber, the uniform air chamber is communicated with the air outlet of the wind box, and the filter chamber is communicated with the air inlet of the wind box.

4. The oven apparatus of claim 1, wherein, A plurality of air inlet guide plates are arranged opposite to the air inlet in the wind box, and a plurality of air outlet guide plates are arranged opposite to the air outlet in the wind box.

5. A radiation heating baking process of a coated film, suitable for use in a baking oven apparatus according to any one of claims 1 to 4, characterized in that, The method comprises the following steps: The radiation heating assembly in the heating cavity of the oven main box heats the coated film, so that the coated film is heated to a first temperature, and the fan in the oven auxiliary box continuously works to ventilate the heating cavity, the temperature of the gas in the heating cavity is a second temperature, and the second temperature is lower than the first temperature; The gas discharged from the heating cavity enters the air-air heat exchanger in the oven auxiliary box, and exchanges heat with the gas to be introduced into the heating cavity in the air-air heat exchanger; The second temperature is 10-40 degrees Celsius lower than the first temperature; A micro negative pressure of-10 to-50 Pa is maintained in the heating cavity.

6. The radiant heat oven process for coating films according to claim 5, wherein The first temperature is 110-150 degrees Celsius, and the second temperature is 70-110 degrees Celsius.

7. The radiant heat oven process for coating films according to claim 5, wherein The method further comprises the step that the roller assembly in the oven main box pulls the coated film through the heating cavity.

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