Water-based UV plastic coating material preheating device

Abstract

The invention relates to the technical field of water-based UV plastic coating materials, in particular to a water-based UV plastic coating material preheating device which comprises a machine base, a conveying belt used for conveying base materials is installed at the upper end of the machine base, a drying channel is fixedly connected to the upper end of the machine base, the conveying belt penetrates through the interior of the drying channel, and a partition plate is installed in the drying channel; the drying tunnel is used for dividing the drying tunnel into an infrared radiation chamber and a hot air heating chamber, a base material sequentially penetrates through the infrared radiation chamber and the hot air heating chamber, an infrared lamp panel is installed in the infrared radiation chamber, a circulating drying assembly is installed at the upper end of the drying tunnel, and an air inlet and an air outlet of the circulating drying assembly are connected with the two ends of the top of the hot air heating chamber respectively. A coating film is preheated by combining two heating modes of infrared radiation and hot air circulation, and the combined heating mode ensures the process safety of a temperature-sensitive plastic base material to the greatest extent while improving the overall preheating efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water-based UV plastic coating materials, in particular to a water-based UV plastic coating material preheating device. BACKGROUND

[0002] The water-based UV plastic coating material is an environmentally friendly high-performance coating applied to the surface of plastic (plastic) substrates, which combines the environmental advantages of "water-based" and the high efficiency and high performance characteristics of "UV curing".

[0003] After the water-based UV plastic coating material is coated on the surface of the substrate, it is cured by UV light to form a high-performance coating film. However, direct use of ultraviolet light to penetrate the layer for curing will cause the water in the coating material to strongly absorb and scatter ultraviolet light, resulting in the UV light being unable to effectively reach the bottom of the coating layer, incomplete UV curing, and affecting the quality of the coating film. Therefore, the coating film can be preheated to remove moisture before curing.

[0004] Traditional preheating methods mainly use single heating methods, such as pure hot air circulation or pure infrared radiation heating. Although the pure hot air heating method has uniform temperature, the heat transfer efficiency is low and the energy consumption is large. Although the pure infrared radiation heating has a fast heating speed, it is easy to cause local overheating on the surface of the substrate, resulting in deformation of the plastic or skin formation on the surface of the coating, which affects the final curing quality.

[0005] Therefore, a water-based UV plastic coating material preheating device is proposed. SUMMARY

[0006] The present application aims to provide a water-based UV plastic coating material preheating device to solve the problems raised in the background art.

[0007] The object of the present application can be achieved by the following technical solutions:

[0008] A water-based UV plastic coating material preheating device, comprising a machine base, a conveying belt for conveying the substrate is installed on the upper end of the machine base, and an oven channel is fixedly connected to the upper end of the machine base, the conveying belt penetrates through the inside of the oven channel, a partition plate is installed in the oven channel to divide the oven channel into an infrared radiation chamber and a hot air heating chamber, the substrate passes through the infrared radiation chamber and the hot air heating chamber in sequence, an infrared lamp panel is installed in the inside of the infrared radiation chamber, a circulating drying assembly is installed on the upper end of the oven channel, and the air inlet and air outlet of the circulating drying assembly are respectively connected to the two ends of the top of the hot air heating chamber.

[0009] Preferably, the circulating drying assembly comprises a fan one, a dehumidifying unit and a heating unit, the fan one, the dehumidifying unit and the heating unit are all fixedly connected to the upper end of the oven channel, the air inlet end of the fan one is connected with a return air inlet through a pipeline, and the return air inlet is in communication with the top of the rear end of the hot air heating chamber;

[0010] The air outlet end of the first fan is connected with the air inlet end of the dehumidifying unit through a pipeline, the air outlet end of the dehumidifying unit is connected with the air inlet end of the heating unit through a pipeline, the air outlet end of the heating unit is connected with an air inlet through a pipeline, and the air inlet is communicated with the top of the front end of the hot air heating chamber.

[0011] Preferably, a side wall of the rear end of the hot air heating chamber is provided with an air exhaust port, the upper end of the base is fixedly connected with a third fan, and the air inlet end of the third fan is connected with the air exhaust port through a pipeline.

[0012] Preferably, the top of the drying channel is fixedly connected with a second fan, the air outlet end of the second fan is connected with the air inlet end of the heating unit through a pipeline, and the air inlet end of the second fan is connected with the air inlet filter.

[0013] Preferably, an air deflector is obliquely inserted into the drying channel, the upper end of the air deflector abuts against the partition plate, and an acute angle is formed between the air deflector and the partition plate.

[0014] Preferably, the upper end of the infrared lamp panel is vertically fixedly connected with a connecting rod, the connecting rod is slidingly installed at the upper end of the drying channel, the upper end of the connecting rod is fixedly connected with a top plate, the two sides of the drying channel are fixedly connected with jacking cylinders, the output ends of the two groups of jacking cylinders are upward, and the output ends of the two groups of jacking cylinders are fixedly connected with the two ends of the top plate respectively.

[0015] Preferably, the inner side wall of the drying channel is coated with a biomimetic super-hydrophobic nano material coating, and the biomimetic super-hydrophobic nano material coating is located in the hot air heating chamber.

[0016] Preferably, the upper end of the base is provided with a groove, the groove is located below the biomimetic super-hydrophobic nano material coating, the bottom wall of the groove is provided with a water guide slope, one end of the groove extends to the outside of the drying channel and is provided with a water suction pipe.

[0017] The present application has the following advantages:

[0018] 1、The present application removes the water in the coating before UV curing through the preheating process, solves the problem of water absorption and scattering of ultraviolet rays, ensures that the UV light can fully and uniformly penetrate to the bottom of the coating for curing, and effectively prevents defects such as sticky coating, insufficient hardness, poor adhesion and the like caused by incomplete curing.

[0019] 2. This invention combines infrared radiation and hot air circulation heating methods. The infrared radiation chamber provides penetrating heating to the wet coating, utilizing its high thermal efficiency to rapidly activate and migrate moisture within the coating, thus solving the problems of slow initial temperature rise and high energy consumption associated with pure hot air heating. The hot air heating chamber provides uniform and gentle secondary drying and leveling of the substrate, utilizing its uniform temperature and sufficient convection to avoid localized overheating and ensure that moisture is gently removed. This prevents thermal deformation of the plastic substrate or skin formation on the coating surface that may occur with pure infrared heating. This combined heating method improves overall preheating efficiency while maximizing process safety for temperature-sensitive plastic substrates. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a front view of the device of the present invention;

[0022] Figure 2 This is a schematic diagram of the back of the device of the present invention;

[0023] Figure 3 This is a cross-sectional structural schematic diagram of the device of the present invention;

[0024] Figure 4 This is a schematic diagram of the upper structure of the base of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the circulating drying component of the present invention;

[0026] Figure 6 This is a schematic diagram of the groove structure of the present invention;

[0027] The attached figures are labeled as follows:

[0028] 1. Base; 2. Conveyor belt; 3. Drying tunnel; 5. Partition; 6. Infrared lamp panel; 7. Connecting rod; 8. Top plate; 9. Lifting cylinder; 10. Return air inlet; 11. Fan 1; 12. Dehumidifier unit; 13. Heating unit; 14. Fan 2; 15. Air inlet; 16. Exhaust port; 17. Fan 3; 18. Bionic superhydrophobic nanomaterial coating; 19. Groove; 20. Water guide slope; 21. Water extraction pipe; 22. Air guide plate. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] A preheating device for water-based UV plastic coating materials, such as Figures 1-6 As shown, the system includes a base 1, with a conveyor belt 2 for transporting substrates mounted on the upper end of the base 1. The conveyor belt 2 system uses a high-temperature resistant silicone belt, and a drying tunnel 3 is fixedly connected to the upper end of the base 1. The conveyor belt 2 passes through the interior of the drying tunnel 3. The outer shell of the drying tunnel 3 is made of 1.2mm thick 304 stainless steel plate, the inner layer is made of 0.8mm thick aluminized zinc plate, and the middle is filled with 100mm thick ceramic fiber insulation cotton. The substrate is placed on the conveyor belt 2, and the movement of the conveyor belt 2 will cause the substrate to pass through the drying tunnel 3. A partition 5 is installed inside the drying tunnel 3 to divide it into an infrared radiation chamber and a hot air heating chamber. The substrate passes through the drying tunnel in sequence... The drying chamber consists of an infrared radiation chamber and a hot air heating chamber. The infrared radiation chamber is equipped with an infrared lamp panel 6, which uses German Herus short-wave infrared quartz lamps. The lamp panel uses a high-purity aluminum reflector to improve thermal radiation efficiency. Both the infrared radiation chamber and the hot air heating chamber are equipped with a temperature control system. The temperature control system uses an Omron E5CC type PID temperature controller, which, together with a K-type thermocouple, monitors the temperature inside the drying tunnel 3 in real time. A circulating drying assembly is installed at the upper end of the drying tunnel 3. The air inlet 15 and the air outlet 10 of the circulating drying assembly are connected to the two ends of the top of the hot air heating chamber, respectively.

[0031] The circulating drying component processes the humid air in the drying tunnel 3, dehumidifies it, and then heats it into dry hot air for use. Compared with the traditional open-loop exhaust method, it greatly reduces energy loss and achieves the production goal of energy saving and environmental protection.

[0032] This device incorporates a preheating process to remove moisture from the coating before UV curing. This solves the problem of moisture absorbing and scattering ultraviolet rays, ensuring that UV light can penetrate fully and evenly to the bottom of the coating for curing. This effectively prevents defects such as stickiness, insufficient hardness, and poor adhesion caused by incomplete curing.

[0033] By combining the infrared radiation and hot air circulation two heating methods, the infrared radiation chamber performs penetrating heating on the wet coating layer, uses the high thermal efficiency characteristics to promote the rapid activation of the coating internal moisture and migration outward, solves the slow initial heating and high energy consumption problems of pure hot air heating, the hot air heating chamber performs uniform and gentle secondary drying and leveling on the substrate, uses the temperature uniformity and sufficient convection characteristics to avoid local overheating, ensures that the moisture is carried away, prevents the possible thermal deformation of the plastic substrate or the coating surface skinning caused by pure infrared heating. This combined heating method improves the overall preheating efficiency while maximizing the process safety of temperature-sensitive plastic substrates.

[0034] The circulating drying assembly includes a fan 11 (model TB-450), a dehumidifier unit 12 (Munters rotary dehumidifier, model Munters CDP600), and a heating unit 13 (using a stainless steel fin type electric heater). The fan 11, the dehumidifier unit 12, and the heating unit 13 are all fixedly connected to the upper end of the drying channel 3. The air inlet end of the fan 11 is connected with an air return port 10 through a pipeline. The air return port 10 is in communication with the top of the rear end of the hot air heating chamber. The air outlet end of the fan 11 is connected with the air inlet end of the dehumidifier unit 12 through a pipeline. The air outlet end of the dehumidifier unit 12 is connected with the air inlet end of the heating unit 13 through a pipeline. The air outlet end of the heating unit 13 is connected with an air inlet port 15 through a pipeline. The air inlet port 15 is in communication with the top of the front end of the hot air heating chamber.

[0035] After the hot air heating chamber preheats the coating film on the substrate, the air in the hot air heating chamber becomes hot and humid. The fan 11 extracts the hot and humid air from the tail of the hot air heating chamber through the air return port 10 and sends it to the dehumidifier unit 12 and the heating unit 13, so that the hot and humid air is heated again after removing the moisture. Through the air inlet port 15, it is sent to the front end of the hot air heating chamber, so that the heat is utilized and the water vapor is removed. Compared with the traditional open-loop exhaust method, the energy loss is greatly reduced, and the energy-saving and environmentally friendly production goal is achieved.

[0036] An air outlet 16 is formed in the side wall of the rear end of the hot air heating chamber. A fan 17 is fixedly connected to the upper end of the base 1. The air inlet end of the fan 17 is connected with the air outlet 16 through a pipeline. A fan 14 is fixedly connected to the top of the drying channel 3. The air outlet end of the fan 14 is connected with the air inlet end of the heating unit 13 through a pipeline. The air inlet end of the fan 14 is connected with the air inlet filter.

[0037] In order to control the slight positive pressure inside the drying tunnel 3, an air outlet 16 is arranged on the side wall at the rear end of the hot air heating chamber, a pneumatic regulating valve is arranged in the air outlet 16, an auxiliary exhaust fan is installed on the base 1 as the fan three 17, a German Schloetter axial flow fan is selected, the model is RLS-250, the air outlet 16 is connected with the fan three 17 through a stainless steel bellows, and a fresh air supplement system is additionally arranged at the top of the drying tunnel 3, which comprises a fan two 14 (the model is TB-150) and a three-stage filtering device, and the fresh air is preheated by the heating unit 13 and then supplemented into the circulating system.

[0038] The air guide plate 22 is obliquely inserted into the drying tunnel 3, the upper end of the air guide plate 22 abuts against the partition plate 5, an acute angle is formed between the air guide plate 22 and the partition plate 5, the air guide plate 22 is located in the hot air heating chamber, the air guide plate 22 guides the hot air to enter the middle part of the hot air heating chamber and is not easy to enter the infrared radiation chamber.

[0039] The upper end of the infrared lamp panel 6 is vertically and fixedly connected with the connecting rod 7, the connecting rod 7 is slidingly installed at the upper end of the drying tunnel 3, the upper end of the connecting rod 7 is fixedly connected with the top plate 8, the top lifting cylinders 9 (the model is SC63x300) are fixedly connected at the two sides of the drying tunnel 3, the output ends of the two groups of top lifting cylinders 9 are upward, the output ends of the two groups of top lifting cylinders 9 are respectively fixedly connected with the two ends of the top plate 8, the output ends of the two groups of top lifting cylinders 9 can be extended or contracted to push or pull the top plate 8, the infrared lamp panel 6 is lifted or lowered through the connecting rod 7, the height of the infrared lamp panel 6 is controlled, and the radiation distance between the infrared lamp panel 6 and the base material is appropriate.

[0040] The drying tunnel 3 is not easy to form condensation under normal circumstances, when extreme conditions (such as instantaneous overload and shutdown and restart) cause the local wall temperature of the drying tunnel 3 to be temporarily lower than the dew point, the condensation is easy to form, in order to prevent the problem from happening, the inside wall of the drying tunnel 3 is coated with a biomimetic super-hydrophobic nanomaterial coating 18, the biomimetic super-hydrophobic nanomaterial coating 18 is located in the hot air heating chamber, the surface of the coating is formed with a micron-level groove structure through laser etching, the directional rolling ability of the condensed water droplets is enhanced, the base 1 is provided with a drainage groove 19 with a trapezoidal cross section in the corresponding area, the bottom wall of the groove 19 is designed with a 3° water guide slope 20, the condensation flows into the groove 19 and flows along the water guide slope 20 to the end of the groove 19, the end of the groove 19 is connected with a water suction pipe 21, the water suction pipe 21 is connected with a workshop drainage system and is provided with a U-shaped water seal to prevent air flow from flowing back.

[0041] The whole control system adopts a Siemens S7-1200 series PLC as a main controller, is provided with a touch screen, can monitor and record various temperature zones, circulating air humidity, fan states and other parameters in real time, has the functions of process formula storage, fault alarm, energy consumption statistics and the like, the preheating process parameters can be automatically executed through a preset program, and the whole process from feeding to discharging is automatically controlled.

[0042] The device can be used in actual application, the substrate is sent into at a speed of 2 m / min, the surface temperature of the infrared heating chamber is set to 55 DEG C, the air temperature of the hot air heating chamber is set to 60 DEG C, the circulating air humidity is controlled below 30% RH, the preheating time is 3-5 minutes, the coating moisture content can be reduced to below 0.5%, the requirement of subsequent UV curing is met, the safety is fully considered in the design of the equipment, multiple over-temperature protection is arranged in each heating area, the electrical system meets the IP54 protection level, and long-term stable operation is ensured.

[0043] The working principle of the water-based UV plastic coating material preheating device provided by the application is as follows:

[0044] The substrate is placed on the conveying belt 2, the conveying belt 2 drives the substrate to enter the infrared radiation chamber and the hot air heating chamber in sequence, the infrared rays directly penetrate the coating in the form of light radiation, the internal water molecules and the resin are synchronously heated and activated, the water is quickly migrated to the surface, the substrate enters the hot air heating chamber, the uniform and gentle convection hot air wraps the workpiece, the surface water is gently taken away and the coating is leveled, the local overheating and stress problems caused by the infrared heating alone are avoided, the wet hot air that absorbs the water is extracted from the rear end of the drying channel 3, after being dehumidified and heated, the dry hot air is sent into the hot air heating chamber from the front end, the controllable exhaust air and new air are combined, the micro-positive pressure in the hot air heating chamber is maintained, a stable and low-humidity dry environment is created and maintained in the hot air heating chamber, the water-based UV plastic coating material preheating device combines the infrared radiation and the hot air circulation two heating modes, the overall preheating efficiency is improved, and the process safety of the temperature-sensitive plastic substrate is maximized.

[0045] The basic principle, main features and advantages of the application are shown and described above. It should be understood by those skilled in the art that the application is not limited by the above examples, the above examples and descriptions in the specification are only to illustrate the principles of the application, various changes and improvements can be made without departing from the spirit and scope of the application, and these changes and improvements all fall within the scope of the claimed application.

Claims

1. A preheating device for water-based UV plastic coating materials, characterized in that, The equipment includes a base (1), on which a conveyor belt (2) for conveying substrates is installed at the upper end. A drying tunnel (3) is fixedly connected to the upper end of the base (1). The conveyor belt (2) passes through the interior of the drying tunnel (3). A partition (5) is installed inside the drying tunnel (3) to divide the drying tunnel (3) into an infrared radiation chamber and a hot air heating chamber. The substrate passes through the infrared radiation chamber and the hot air heating chamber in sequence. An infrared lamp plate (6) is installed inside the infrared radiation chamber. A circulating drying assembly is installed at the upper end of the drying tunnel (3). The air inlet (15) and air outlet of the circulating drying assembly are respectively connected to the two ends of the top of the hot air heating chamber.

2. The water-based UV plastic coating material preheating device according to claim 1, characterized in that, The circulating drying assembly includes a fan (11), a dehumidifier (12), and a heating unit (13). The fan (11), the dehumidifier (12), and the heating unit (13) are all fixed to the upper end of the drying tunnel (3). The air inlet of the fan (11) is connected to a return air port (10) through a pipe. The return air port (10) is connected to the top of the rear end of the hot air heating chamber. The air outlet of the fan (11) is connected to the air inlet of the dehumidifier unit (12) through a pipe. The air outlet of the dehumidifier unit (12) is connected to the air inlet of the heating unit (13) through a pipe. The air outlet of the heating unit (13) is connected to an air inlet (15) through a pipe. The air inlet (15) is connected to the top of the front end of the hot air heating chamber.

3. The water-based UV plastic coating material preheating device according to claim 1, characterized in that, The hot air heating chamber has an exhaust port (16) on the side wall at the rear end. A fan (17) is fixedly connected to the upper end of the base (1). The air inlet of the fan (17) is connected to the exhaust port (16) through a pipe.

4. The water-based UV plastic coating material preheating device according to claim 3, characterized in that, The top of the drying tunnel (3) is fixedly connected to a second fan (14). The air outlet of the second fan (14) is connected to the air inlet of the heating unit (13) through a pipe. The air inlet of the second fan (14) is connected to the air inlet filter.

5. The water-based UV plastic coating material preheating device according to claim 1, characterized in that, An air guide plate (22) is inserted obliquely inside the drying tunnel (3). The upper end of the air guide plate (22) abuts against the partition plate (5), and an acute angle is formed between the air guide plate (22) and the partition plate (5).

6. The water-based UV plastic coating material preheating device according to claim 1, characterized in that, The upper end of the infrared lamp plate (6) is vertically fixed with a connecting rod (7), which is slidably installed with the upper end of the drying tunnel (3). The upper end of the connecting rod (7) is fixed with a top plate (8). Both sides of the drying tunnel (3) are fixed with lifting cylinders (9). The output ends of the two sets of lifting cylinders (9) are upward, and the output ends of the two sets of lifting cylinders (9) are fixed with the two ends of the top plate (8) respectively.

7. The water-based UV plastic coating material preheating device according to claim 1, characterized in that, The inner wall of the drying tunnel (3) is coated with a biomimetic superhydrophobic nanomaterial coating (18), which is located in the hot air heating chamber.

8. The water-based UV plastic coating material preheating device according to claim 7, characterized in that, The upper end of the base (1) is provided with a groove (19), which is located below the biomimetic superhydrophobic nanomaterial coating (18). The bottom wall of the groove (19) is provided with a water guiding slope (20), and one end of the groove (19) extends to the outside of the drying tunnel (3) and is equipped with a water pumping pipe (21).

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