Drying equipment for glitter powder membrane material

Abstract

The utility model relates to drying equipment for glitter powder membrane materials, which comprises an exhaust pipeline, at least three drying ovens, at least three hot air supply devices and at least three exhaust devices, and the drying ovens are sequentially arranged from front to back; an air outlet of the hot air supply device is communicated with an air inlet of the corresponding drying oven, and an air inlet of the exhaust device is communicated with a first exhaust outlet of the corresponding drying oven; an air outlet of each air exhaust device is communicated with the air exhaust pipeline; the drying equipment further comprises at least one waste gas returning device. And except for the drying oven on the foremost side, in the two front-back adjacent drying ovens, the second air outlet of the rear drying oven is communicated with the hot air supply device corresponding to the front drying oven through the corresponding waste gas return device. According to the drying equipment, waste gas can be recycled, the emission amount of the waste gas can be reduced, heat contained in the waste gas can be effectively utilized, energy consumption is reduced, and therefore the purposes of saving energy and reducing emission are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of film material drying equipment, in particular to a drying equipment for glitter powder film material. Background Art

[0002] Glitter powder, also known as glitter powder, and larger particles are called glitter flakes (or glitter flakes). Glitter film is typically made from a highly glossy, metal-coated film (also known as glitter film) that is precision-cut. Glitter film uses a transparent PET film as its base material. Aluminum is vapor-coated on the surface of the PET film to create an aluminum layer. A colored coating is then transferred to one or both sides using a gravure printing machine. After high-temperature drying, the colored layer is formed, resulting in a variety of colors.

[0003] Currently, gravure printing machines use drying equipment to heat and dry the colored coating on glitter film. Existing drying equipment for glitter film generally includes multiple drying ovens arranged in sequence from front to back, each equipped with a hot air supply device and an exhaust device. The drying ovens are equipped with air inlets and exhaust vents. The exhaust device's air inlet is connected to the drying oven's exhaust vent. The hot air supply device includes a heating chamber, an electric heater, and an air blower. The electric heater is installed in the heating chamber's inner cavity. The heating chamber is provided with a first opening and a second opening on either side. The second opening of the heating chamber is connected to the air inlet of the air blower, and the air outlet of the air blower is connected to the air inlet of the drying oven. During operation, the glitter film material is transported from front to back, passing through the inner cavity of each drying oven in turn; a hot air supply device supplies hot air to the drying oven, which blows the hot air towards the glitter film material to dry it; the hot air in the inner cavity of each drying oven contains organic solvents after contacting the glitter film material, and the resulting waste gas is sent into the exhaust duct by the corresponding exhaust device, and finally discharged from the exhaust duct for centralized treatment. However, the waste gas generated by each drying oven in this drying equipment is directly discharged into the exhaust duct, which cannot achieve waste gas recycling. Moreover, as the glitter film material moves through the drying ovens for drying, the solvent volatilized by the glitter film in the drying oven body becomes less and less. The organic solvent concentration of the waste gas generated by the drying ovens closer to the back is lower. Since the waste gas with a low organic solvent concentration is also directly discharged, the large amount of heat it contains cannot be fully utilized. Therefore, this drying equipment has the disadvantages of high energy consumption and large waste gas emissions. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a drying device for glitter powder film materials, which can realize the reuse of waste gas, not only reducing the emission of waste gas, but also effectively utilizing the heat contained in the waste gas, reducing energy consumption, thereby achieving the purpose of energy saving and emission reduction. The technical solution adopted is as follows:

[0005] A drying device for glitter powder film materials, comprising an exhaust duct, at least three drying ovens, at least three hot air supply devices and at least three exhaust devices, the drying ovens being arranged in sequence from front to back along the conveying direction of the glitter powder film materials, and the front and rear sides of the drying ovens being respectively provided with a feed port and a discharge port; the number of hot air supply devices and exhaust devices is the same as that of the drying ovens and they correspond one to one, the air outlet of the hot air supply device is connected to the air inlet of the corresponding drying oven, and the air inlet of the exhaust device is connected to the first air outlet of the corresponding drying oven; the air outlet of each exhaust device is connected to the exhaust duct; it is characterized in that: the drying equipment also includes at least one exhaust gas return device; except for the drying oven at the front side, of the two adjacent drying ovens, the second air outlet of the rear drying oven is connected to the hot air supply device corresponding to the front drying oven through the corresponding exhaust gas return device.

[0006] During operation, each hot air supply device and exhaust device are activated. Each hot air supply device continuously draws in external air for heating and delivers the resulting hot air into the corresponding drying oven cavity, raising the temperature in each drying oven to the preset value. Each exhaust device generates negative pressure at the first exhaust port of the corresponding drying oven, extracting the exhaust gas generated in the drying oven and forming a heat flow within the drying oven. The glitter film is transported from front to back through the cavity of each drying oven. When the glitter film passes through the cavity of a drying oven, the hot air generated by the corresponding hot air supply device is blown onto the surface of the glitter film, drying it. The exhaust gas (i.e., the exhaust gas containing organic solvents) generated by the hot air contacting the glitter film is discharged from the first exhaust port of the drying oven under the action of the exhaust device and delivered to the exhaust duct. Except for the drying ovens at the front and rear, each exhaust gas return device can respectively send part of the exhaust gas in the adjacent subsequent drying oven into the corresponding hot air supply device, which then mixes and heats it with the newly incoming outside air (the returned exhaust gas can be mixed with the outside air first, and then the mixed gas is heated; or the outside air can be heated first, and then the heated outside air is mixed with the returned exhaust gas), and then sent to the adjacent previous drying oven. This can realize the reuse of exhaust gas, which can not only reduce the emission of exhaust gas, but also realize the effective utilization of the heat contained in the exhaust gas, thereby achieving the purpose of energy saving and emission reduction.

[0007] In the aforementioned drying equipment, there are two fewer exhaust gas recirculation devices than hot air supply devices. With the exception of the front-most and rear-most hot air supply devices (the first and last hot air supply devices along the conveying direction of the glitter film material), which are not connected to exhaust gas recirculation devices, all other hot air supply devices are connected to exhaust gas recirculation devices. These utilize exhaust gas returned from the adjacent subsequent drying oven as part of the hot air supplied to the corresponding drying oven. The front-most drying oven does not utilize exhaust gas returned from the second drying oven, but only utilizes heated outside air to generate hot air. This ensures that the hot air can remove more organic solvents.

[0008] As a preferred embodiment of the present invention, the exhaust device includes an exhaust fan and an outlet pipe. The exhaust fan's air inlet is connected to the first outlet of the corresponding drying oven, and the exhaust fan's air outlet is connected to the exhaust duct via the outlet pipe. During operation, the exhaust fan generates negative pressure at the first outlet of the drying oven, extracting exhaust gas generated in the drying oven and delivering it to the exhaust duct through the outlet pipe.

[0009] As a preferred embodiment of the present invention, the hot air supply devices at the front and rear sides include a heating chamber, an electric heater and an air inlet fan, the electric heater is installed in the inner cavity of the heating chamber, and a first opening and a second opening are respectively provided on both sides of the heating chamber, the second opening of the heating chamber is connected to the air inlet of the air inlet fan, and the air outlet of the air inlet fan is connected to the air inlet of the corresponding drying oven; the remaining hot air supply devices include a heating chamber, an electric heater, an air mixing chamber and an air inlet fan, the electric heater is installed in the inner cavity of the heating chamber, and a first opening and a second opening are respectively provided on both sides of the heating chamber, the second opening of the heating chamber is connected to the air inlet of the air inlet fan through the inner cavity of the air mixing chamber, and the air outlet of the air inlet fan is connected to the air inlet of the corresponding drying oven; the exhaust gas return device includes an exhaust gas return pipe, the first end of the exhaust gas return pipe is connected to the second exhaust outlet of the corresponding drying oven, and the second end of the exhaust gas return pipe is connected to the inner cavity of the corresponding air mixing chamber. During operation, under the action of the air inlet fan, the outside air enters the inner cavity of the heating chamber from the first opening of the heating chamber, and is heated by the electric heater. The resulting hot air is mixed evenly with the exhaust gas sent from the exhaust gas return device in the inner cavity of the air mixing chamber, and then is sent into the corresponding drying oven cavity by the air inlet fan.

[0010] As a further preferred embodiment of the present invention, the drying device further comprises a controller and a plurality of temperature sensors, each of which is mounted at the air inlet of the corresponding drying oven, each of which is electrically connected to the corresponding input terminal of the controller, and each of which is electrically connected to the corresponding output terminal of the controller. During operation, each of the temperature sensors is used to detect the temperature of the hot air arriving at the air inlet of the corresponding drying oven and send the detected temperature to the controller for processing: when a temperature sensor detects that the temperature of the hot air arriving at the air inlet of the corresponding drying oven is lower than a preset value, the controller controls the corresponding electric heater to increase the amount of heating applied to the outside air entering the heating chamber to increase the temperature of the hot air entering the drying oven; when a temperature sensor detects that the temperature of the hot air arriving at the air inlet of the corresponding drying oven is higher than a preset value, the controller controls the corresponding electric heater to reduce the amount of heating applied to the outside air entering the heating chamber to reduce the temperature of the hot air entering the drying oven, thereby ensuring that the temperature in the corresponding drying oven is within a preset appropriate range.

[0011] As a further preferred embodiment of the present invention, the exhaust gas return device further comprises an exhaust fan mounted at the second exhaust port of the corresponding drying oven, with the exhaust fan's air inlet communicating with the second exhaust port of the drying oven, and the exhaust fan's air outlet communicating with the inner cavity of the corresponding air mixing chamber via an exhaust gas return pipe. During operation, the exhaust fan can create a negative pressure at the second exhaust port of the drying oven, extracting a portion of the exhaust gas from the corresponding drying oven and delivering it to the inner cavity of the corresponding air mixing chamber via the exhaust gas return pipe.

[0012] As another preferred embodiment of the present invention, each of the hot air supply devices includes a heating chamber, an electric heater, and an air inlet fan, wherein the electric heater is installed in the inner cavity of the heating chamber, and a first opening and a second opening are respectively provided on either side of the heating chamber, wherein the second opening of the heating chamber is connected to the air inlet of the air inlet fan, and the air outlet of the air inlet fan is connected to the air inlet of the corresponding drying oven; and wherein the exhaust gas return device includes an exhaust gas return pipe, wherein a first end of the exhaust gas return pipe is connected to the second exhaust outlet of the corresponding drying oven, and a second end of the exhaust gas return pipe is connected to the inner cavity of the corresponding heating chamber. During operation, under the action of the air inlet fan, outside air enters the inner cavity of the heating chamber from the first opening of the heating chamber, and at the same time, the exhaust gas return pipe sends part of the exhaust gas from the adjacent subsequent drying oven into the inner cavity of the heating chamber, where the exhaust gas is mixed with the outside air, heated by the electric heater, and then sent into the inner cavity of the corresponding drying oven by the air inlet fan.

[0013] As a further preferred embodiment of the present invention, the drying device further comprises a controller and a plurality of temperature sensors, each of which is mounted at the air inlet of the corresponding drying oven, each of which is electrically connected to the corresponding input terminal of the controller, and each of which is electrically connected to the corresponding output terminal of the controller. During operation, each of the temperature sensors is used to detect the temperature of the hot air arriving at the air inlet of the corresponding drying oven and send the detected temperature to the controller for processing: when a temperature sensor detects that the temperature of the hot air arriving at the air inlet of the corresponding drying oven is lower than a preset value, the controller controls the corresponding electric heater to increase the amount of heating applied to the outside air entering the heating chamber to increase the temperature of the hot air entering the drying oven; when a temperature sensor detects that the temperature of the hot air arriving at the air inlet of the corresponding drying oven is higher than a preset value, the controller controls the corresponding electric heater to reduce the amount of heating applied to the outside air entering the heating chamber to reduce the temperature of the hot air entering the drying oven, thereby ensuring that the temperature in the corresponding drying oven is within a preset appropriate range.

[0014] As a further preferred embodiment of the present invention, the exhaust gas return device further comprises an exhaust fan mounted at the second exhaust port of the corresponding drying oven, with the exhaust fan's air inlet communicating with the second exhaust port of the drying oven, and the exhaust fan's air outlet communicating with the first end of the exhaust gas return pipe. During operation, the exhaust fan can create a negative pressure at the second exhaust port of the drying oven, thereby extracting a portion of the exhaust gas from the corresponding drying oven and delivering it into the inner cavity of the corresponding heating chamber through the exhaust gas return pipe.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] This drying equipment for glitter powder film materials can achieve the reuse of waste gas through the coordination between the exhaust duct, various drying ovens, various exhaust devices, various hot air supply devices and various waste gas return devices. It can not only reduce the emission of waste gas, but also achieve effective utilization of the heat of the waste gas, reduce energy consumption, and thus achieve the purpose of energy saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of Example 1 of the preferred embodiment of the present invention.

[0018] Figure 2 It is a structural diagram of Example 2 of the preferred implementation method of the present utility model. DETAILED DESCRIPTION

[0019] Example 1, as Figure 1As shown, this drying equipment for glitter powder film materials includes an exhaust duct 1, four drying ovens 2, four hot air supply devices 3, four exhaust devices 4 and two exhaust gas return devices 5. The drying ovens 2 are arranged in sequence from front to back along the conveying direction of the glitter powder film material 100, and the front and rear sides of the drying ovens 2 are respectively provided with a feed port 201 and a discharge port 202; the number of hot air supply devices 3 and exhaust devices 4 is the same as that of the drying ovens 2 and they correspond one to one, the outlet of the hot air supply device 3 is connected to the air inlet 203 of the corresponding drying oven 2, and the air inlet of the exhaust device 4 is connected to the first exhaust port 204 of the corresponding drying oven 2; the outlet of each exhaust device 4 is connected to the exhaust duct 1; except for the frontmost drying oven 2, in the two adjacent drying ovens 2, the second exhaust port 205 of the rear drying oven 2 is connected to the hot air supply device 3 corresponding to the front drying oven 2 through the corresponding exhaust gas return device 5.

[0020] In this embodiment, the exhaust device 4 includes an exhaust fan 41 and an air outlet pipe 42 . The air inlet of the exhaust fan 41 is connected to the first air outlet 204 of the corresponding drying oven 2 , and the air outlet of the exhaust fan 41 is connected to the exhaust duct 1 through the air outlet pipe 42 .

[0021] In this embodiment, the hot air supply device 3 on the front and rear sides includes a heating chamber 31, an electric heater 32 and an air inlet fan 33. The electric heater 32 is installed in the inner cavity of the heating chamber 31. The electric heater 32 includes a plurality of electric heating tubes arranged side by side. A first opening 3101 and a second opening 3102 are respectively provided on both sides of the heating chamber 31. The second opening 3102 of the heating chamber 31 is connected to the air inlet of the air inlet fan 33, and the air outlet of the air inlet fan 33 is connected to the air inlet 203 of the corresponding drying oven 2. The remaining hot air supply devices 3 include a heating chamber 31, an electric heater 32, an air inlet fan 33 and an air mixing chamber 34. The electric heater 32 is installed in the inner cavity of the heating chamber 31. A first opening 3101 and a second opening 3102 are respectively provided on both sides of the heating chamber 31. The second opening 3102 of the heating chamber 31 is connected to the air inlet of the air inlet fan 33 through the inner cavity of the air mixing chamber 34, and the air outlet of the air inlet fan 33 is connected to the air inlet 203 of the corresponding drying oven 2; the exhaust gas return device 5 includes an exhaust gas return pipe 51 and an exhaust fan 52. The exhaust fan 52 is installed at the second exhaust port 205 of the corresponding drying oven 2. The air inlet of the exhaust fan 52 is connected to the second exhaust port 205 of the drying oven 2. The first end of the exhaust gas return pipe 51 is connected to the air outlet of the exhaust fan 52, and the second end of the exhaust gas return pipe 51 is connected to the inner cavity of the corresponding air mixing chamber 34.

[0022] In this embodiment, the drying apparatus further includes a controller (not shown) and a plurality of temperature sensors 6. Each temperature sensor 35 is mounted at the air inlet 203 of the corresponding drying oven 2. Each temperature sensor 35 is electrically connected to a corresponding input terminal of the controller, and each electric heater 32 is electrically connected to a corresponding output terminal of the controller. During operation, each temperature sensor 35 is used to detect the temperature of the hot air arriving at the air inlet 203 of the drying oven 2 and transmit the detected temperature to the controller for processing. When a temperature sensor 35 detects that the temperature at the air inlet of the corresponding drying oven 2 is lower than a preset value, the controller controls the corresponding electric heater 32 to increase the amount of heat applied to the outside air entering the heating chamber 31, thereby increasing the temperature of the hot air entering the drying oven 2. When a temperature sensor 35 detects that the temperature of the hot air arriving at the air inlet of the corresponding drying oven 2 is higher than a preset value, the controller controls the corresponding electric heater 32 to reduce the amount of heat applied to the outside air entering the heating chamber 31, thereby lowering the temperature of the hot air entering the drying oven 2. This ensures that the temperature in the corresponding drying oven 2 is within a preset appropriate range.

[0023] The following is a brief description of the working principle of this drying equipment:

[0024] During operation, each hot air supply device 3 and each exhaust device 4 are started. Under the action of the air inlet fan 33 of each hot air supply device 3, the outside air enters the inner cavity of the heating chamber 31 from the first opening 3101 of the heating chamber 31, and is heated by the electric heater 32. The hot air formed is mixed with the exhaust gas sent by the exhaust gas return device 5 in the inner cavity of the air mixing chamber 34, and then is sent into the inner cavity of the corresponding drying oven 2 by the air inlet fan 33 to form a heat flow in the drying oven 2; the glitter powder film 100 is transported from front to back through each drying oven in turn. The inner cavity of the drying oven 2; when the glitter powder film material 100 passes through the inner cavity of a drying oven 2, the hot air generated by the corresponding hot air supply device 3 is blown toward the surface of the glitter powder film material 100 to dry the surface of the glitter powder film material 100. The exhaust gas (i.e., the exhaust gas containing organic solvents) generated after the hot air contacts the glitter powder film material 100 is generated. The exhaust fans 41 of each exhaust device 4 respectively generate negative pressure at the first exhaust port 204 of the corresponding drying oven 2, extract the exhaust gas generated in the drying oven 2 and send it into the exhaust duct 1 through the outlet pipe 42. Except for the frontmost and rearmost drying ovens 2 (the first and last hot air supply devices 3 along the conveying direction of the glitter powder film material 100), which are not connected to the exhaust gas return device 5, the remaining hot air supply devices 3 are all connected to the exhaust gas return device 5. Each exhaust gas return device 5 can respectively send part of the exhaust gas in the adjacent subsequent drying oven 2 into the corresponding hot air supply device 3, and then the hot air supply device 3 mixes and heats it with the newly entered external air (the returned exhaust gas can be mixed with the external air first, and then the mixed gas is heated; or the external air can be heated first, and then the heated external air is mixed with the returned exhaust gas), and then sent to the adjacent previous drying oven 2. The frontmost drying oven 2 does not use the exhaust gas returned by the second drying oven 2, but only uses the external air to form hot air after heating, in order to ensure that the hot air therein can carry away more organic solvents.

[0025] Example 2, reference Figure 2 , while other parts are the same as those in Example 1, the difference is that: in this embodiment, all hot air supply devices 3 include a heating chamber 31, an electric heater 32 and an air inlet fan 33, the electric heater 32 is installed in the inner cavity of the heating chamber 31, and a first opening 3101 and a second opening 3102 are respectively provided on both sides of the heating chamber 31, the second opening 3102 of the heating chamber 31 is connected to the air inlet of the air inlet fan 33, and the air outlet of the air inlet fan 33 is connected to the air inlet 203 of the corresponding drying oven 2.

[0026] In this embodiment, the second end of the exhaust gas return pipe 51 is in communication with the inner cavity of the corresponding heating chamber 31. During operation, the exhaust fan 52 of the exhaust gas return device 5 can create a negative pressure at the second exhaust port 205 of the drying oven 2, extracting a portion of the exhaust gas from the corresponding drying oven 2 and delivering it into the inner cavity of the corresponding heating chamber 31 through the exhaust gas return pipe 51. Simultaneously, under the action of the air inlet fan 33, outside air enters the inner cavity of the heating chamber 31 through the first opening 3101 of the heating chamber 31. After being evenly mixed with the exhaust gas delivered from the exhaust gas return pipe 51, it is heated by the electric heater 32 and then delivered into the inner cavity of the corresponding drying oven 2 by the air inlet fan 33.

[0027] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different. Any equivalent or simple changes based on the structure, features, and principles of the present utility model patent are included in the scope of protection of the present utility model patent. Those skilled in the art of the present utility model can make various modifications, supplements, or replace the described specific embodiments with similar methods. As long as they do not deviate from the structure of the present utility model or exceed the scope defined by the claims, they shall fall within the scope of protection of the present utility model.

Claims

1. A drying device for glitter powder film material, comprising an exhaust duct, at least three drying ovens, at least three hot air supply devices, and at least three exhaust devices, wherein the drying ovens are arranged in sequence from front to back along the conveying direction of the glitter powder film material, and the front and rear sides of the drying ovens are respectively provided with a feed port and a discharge port; the number of hot air supply devices and exhaust devices is the same as that of the drying ovens and the number of hot air supply devices and exhaust devices is one-to-one corresponding, the air outlet of the hot air supply device is connected to the air inlet of the corresponding drying oven, and the air inlet of the exhaust device is connected to the first exhaust port of the corresponding drying oven; the air outlet of each exhaust device is connected to the exhaust duct; characterized in that: The drying equipment also includes at least one exhaust gas return device; except for the drying oven at the front, among the two adjacent drying ovens, the second exhaust port of the rear drying oven is connected to the hot air supply device corresponding to the front drying oven through the corresponding exhaust gas return device.

2. The drying equipment for glitter powder film according to claim 1, characterized in that: The hot air supply devices at the front and rear sides include a heating chamber, an electric heater and an air inlet fan. The electric heater is installed in the inner cavity of the heating chamber. A first opening and a second opening are respectively provided on both sides of the heating chamber. The second opening of the heating chamber is connected to the air inlet of the air inlet fan, and the air outlet of the air inlet fan is connected to the air inlet of the corresponding drying oven; the remaining hot air supply devices include a heating chamber, an electric heater, an air mixing chamber and an air inlet fan. The electric heater is installed in the inner cavity of the heating chamber. A first opening and a second opening are respectively provided on both sides of the heating chamber. The second opening of the heating chamber is connected to the air inlet of the air inlet fan through the inner cavity of the air mixing chamber, and the air outlet of the air inlet fan is connected to the air inlet of the corresponding drying oven; the exhaust gas return device includes an exhaust gas return pipe. The first end of the exhaust gas return pipe is connected to the second exhaust outlet of the corresponding drying oven, and the second end of the exhaust gas return pipe is connected to the inner cavity of the corresponding air mixing chamber.

3. The drying equipment for glitter powder film according to claim 2, characterized in that: The drying equipment also includes a controller and multiple temperature sensors, each temperature sensor is installed at the air inlet of the corresponding drying oven, each temperature sensor is electrically connected to the corresponding input end of the controller, and each electric heater of the hot air supply device is electrically connected to the corresponding output end of the controller.

4. The drying equipment for glitter powder film according to claim 2, characterized in that: The exhaust gas return device also includes an exhaust fan, which is installed at the second exhaust port of the corresponding drying oven. The air inlet of the exhaust fan is connected to the second exhaust port of the drying oven, and the air outlet of the exhaust fan is connected to the inner cavity of the corresponding air mixing chamber through the exhaust gas return pipe.

5. The drying equipment for glitter powder film according to claim 1, characterized in that: Each of the hot air supply devices includes a heating chamber, an electric heater and an air inlet fan. The electric heater is installed in the inner cavity of the heating chamber. A first opening and a second opening are respectively provided on both sides of the heating chamber. The second opening of the heating chamber is connected to the air inlet of the air inlet fan, and the air outlet of the air inlet fan is connected to the air inlet of the corresponding drying oven; the exhaust gas return device includes an exhaust gas return pipe, the first end of the exhaust gas return pipe is connected to the second exhaust outlet of the corresponding drying oven, and the second end of the exhaust gas return pipe is connected to the inner cavity of the corresponding heating chamber.

6. The drying equipment for glitter powder film according to claim 5, characterized in that: The drying equipment also includes a controller and multiple temperature sensors, each temperature sensor is installed at the air inlet of the corresponding drying oven, each temperature sensor is electrically connected to the corresponding input end of the controller, and each electric heater of the hot air supply device is electrically connected to the corresponding output end of the controller.

7. The drying equipment for glitter powder film according to claim 5, characterized in that: The exhaust gas return device also includes an exhaust fan, which is installed at the second exhaust port of the corresponding drying oven. The air inlet of the exhaust fan is connected to the second exhaust port of the drying oven, and the air outlet of the exhaust fan is connected to the first end of the exhaust gas return pipe.

8. The drying equipment for glitter powder film according to any one of claims 1 to 7, characterized in that: The exhaust device includes an exhaust fan and an air outlet pipe. The air inlet of the exhaust fan is connected to the first air outlet of the corresponding drying oven, and the air outlet of the exhaust fan is connected to the exhaust duct through the air outlet pipe.

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