CN110608595A - Microwave drying synthetic leather waterborne polyurethane coating device - Google Patents
Microwave drying synthetic leather waterborne polyurethane coating device Download PDFInfo
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- CN110608595A CN110608595A CN201910878590.0A CN201910878590A CN110608595A CN 110608595 A CN110608595 A CN 110608595A CN 201910878590 A CN201910878590 A CN 201910878590A CN 110608595 A CN110608595 A CN 110608595A
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- microwave drying
- microwave
- synthetic leather
- drying cavity
- polyurethane coating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/001—Drying and oxidising yarns, ribbons or the like
- F26B13/002—Drying coated, e.g. enamelled, varnished, wires
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
- F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
- F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- Molecular Biology (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
The invention provides a microwave drying synthetic leather waterborne polyurethane coating device, which comprises a microwave drying cavity, a magnetron, a microwave drying cavity and a microwave drying device, wherein the magnetron generates microwave radiation to the synthetic leather with the waterborne polyurethane coating to be dried in the microwave drying cavity; the microwave drying cavity comprises a microwave drying cavity, a dehumidifying device and a condensate water recovery device, wherein the microwave drying cavity is internally provided with a microwave drying cavity, the microwave drying cavity is internally provided with a drying chamber, the drying chamber is internally. The invention utilizes the condensed water generated by the condensing device to realize the cooling of the magnetron, and fully utilizes and recovers the condensed water.
Description
Technical Field
The invention relates to the same field of microwave, in particular to a device for drying a synthetic leather waterborne polyurethane coating by microwave.
Background
The paint industry belongs to the high and new technology industry, and the development level of the paint industry is a standard for measuring the developed level of the national chemical industry. The traditional coating adopts a volatile solvent material as the coating, although the coating can play a role of drying quickly, the volatile toxic solvent emitted from the interior of the coating seriously pollutes the natural environment and harms the human health. In order to realize pollution-free and safe drying of the coating, the research on the coating process gradually realizes the transformation from a solvent type to a water-based coating. The water-based paint takes water as a dispersion medium, has the characteristics of no toxicity, environmental protection, safety, reliability and the like, and also has some important performance characteristics of a solvent-based paint. Polyurethane coating materials using water as a solvent have been widely used in recent years in synthetic leather coating processes at home and abroad.
The synthetic leather coating consists of a surface layer, a foaming layer, an adhesive layer and base cloth, and a layer of coating is often required to be coated on the surface layer of the synthetic leather in order to enable the surface of the synthetic leather to have uniform and clean color, glossy appearance and smooth hand feeling and cover part of defects and defects. The coating can form a protective film on the synthetic leather surface after being dried, and the protective film has certain adhesive force, mechanical strength and flexibility, can improve the look and feel of the synthetic leather, and is favorable for the waterproof and wear-resistant synthetic leather and better maintained.
Traditional synthetic leather drying process adopts steam, hot air, infrared, oven etc. as the heat source to come dry coating, and these drying methods are external heating, lead to inside moisture can't in time discharge, finally form the bubble in the coating inside, influence the impression and the performance of the protection film that the coating formed. In recent years, a new drying technology combining several drying modes has appeared, a patent with application number 201310431121.7 proposes drying the water-based polyurethane synthetic leather by adopting a drying technology combining microwave and air grid hot air, and a patent with application number 201811495120.8 proposes drying the water-based paint by combining microwave, infrared and external hot air as heat sources, and the combined drying modes have good effects on dried objects, but the requirements on energy sources are further increased.
The microwave heating mode has the characteristics of high drying speed, no secondary pollution and the like. The diffusion drying of the moisture inside the coating to the outside can be realized, but for the long-time work of the microwave equipment, the heat dissipation problem of the magnetron is the problem to be solved. The patent with application number 201710672499.4 considers that the heat pump device is utilized to realize the circulation of the wet air in the closed cavity, so as to reduce the air humidity in the cavity and improve the drying efficiency of the product. The patent does not consider that the condensed water produced by cooling can be used to lower the temperature of the magnetron, while the uniformity and effectiveness of the wind is not considered at the hot air circulation. Application number 201820494278.2's patent considers the design tunnel type microwave sterilization desiccator, has realized the discharge of the inside humid hot gas of heating cavity, has promoted microwave drying speed and dehumidification effect is obvious, but this design fails to consider the cyclic utilization to the inside humid air energy of taking out of cavity.
The existing microwave drying device mainly has the following problems: the microwave energy is favorable for acting on places with many water molecules, and the microwave drying equipment can be used for quickly drying the water-containing material, but in the drying process of actual industrial production, the material is conveyed into the microwave drying cavity to be dried, so that water vapor is generated, the air humidity in the cavity is increased, and the coating drying speed is slow due to the large air humidity. The steam generated in the drying process is generally discharged to the outside of the drying cavity by adopting an exhaust pipeline, the energy of the damp-heat gas is not effectively reused, the heat waste is caused, and meanwhile, the problem of heating of the microwave magnetron is not solved by utilizing condensed water generated after condensation.
Disclosure of Invention
The invention provides a tunnel type microwave drying synthetic leather waterborne polyurethane coating device aiming at the defects of the prior art, which fully utilizes moist-heat gas generated by microwave heating, realizes magnetron cooling through condensed water generated by a condensing device, and solves the problems of the existing microwave drying device by utilizing a vapor compression refrigeration principle.
The technical scheme adopted by the invention for realizing the technical purpose is as follows: a microwave drying synthetic leather waterborne polyurethane coating device comprises a microwave drying cavity, a magnetron, a microwave drying cavity and a microwave drying device, wherein the magnetron generates microwave radiation to the synthetic leather with the waterborne polyurethane coating to be dried in the microwave drying cavity; the microwave drying cavity comprises a microwave drying cavity, a dehumidifying device and a condensate water recovery device, wherein the microwave drying cavity is internally provided with a microwave drying cavity, the microwave drying cavity is internally provided with a drying chamber, the drying chamber is internally.
The invention utilizes the condensed water generated by the condensing device to realize the cooling of the magnetron, and fully utilizes and recovers the condensed water.
Further, in the above microwave drying synthetic leather waterborne polyurethane coating device: the hot air diffusion device is also included; the hot air diffusion device sends the drying gas condensed and dehydrated in the condensing device into the microwave drying body.
Further, in the above microwave drying synthetic leather waterborne polyurethane coating device: the hot air diffusion device is also included; the hot air diffusion device sends the dry air generated by the condensation device into the microwave drying cavity.
The above two ways make full use of the heat in the hot humid air.
Further, in the above microwave drying synthetic leather waterborne polyurethane coating device: the hot air diffusion device is internally provided with a plurality of mutually independent air supply devices for supplying air into the microwave drying cavity, and the air supply devices are distributed on the side wall of the microwave drying cavity.
Further, in the above microwave drying synthetic leather waterborne polyurethane coating device: a conveying belt for conveying the synthetic leather with the waterborne polyurethane coating to be dried into the microwave drying cavity is arranged at the lower side of the microwave drying cavity, and stoppers for preventing microwave leakage are respectively arranged on the front and the back of the microwave drying cavity on the conveying belt; and a metal filter screen for preventing microwave leakage is arranged at the inlet of the dehumidifying device.
Further, in the above microwave drying synthetic leather waterborne polyurethane coating device: the microwave leakage prevention cut-off device is composed of 1/4 wavelength waveguide groove suppressors at two ends of the microwave drying cavity, and the height between the plane where the top of the 1/4 wavelength waveguide groove suppressor is located and the plane where the bottom of the microwave drying cavity (1) is located is 7 cm.
Further, in the above microwave drying synthetic leather waterborne polyurethane coating device: an infrared thermal imager and a humidity sensor are arranged in the microwave drying cavity, and a temperature sensor for detecting the air temperature is arranged at the outlet of an air supply outlet of the air supply device; the inlet of the air supply outlet of the air supply device is provided with a control valve and a control valve sensor, and the air supply device also comprises a control module; the output ends of the infrared thermal imager and the humidity sensor, the temperature sensor and the control valve sensor are respectively connected with the control module; the control module controls the fan rotating speed of the dehumidifying device, the condensing speed of the condensing device, the fan rotating speed of the hot air diffusion device and the conveying speed of the conveying belt according to the output data of the infrared thermal imager, the humidity sensor, the temperature sensor and the control valve sensor.
The present invention will be further described with reference to the accompanying drawings and detailed description.
Drawings
FIG. 1 is a schematic structural diagram of a tunnel-type microwave drying synthetic leather waterborne polyurethane coating device of the invention;
in the figure 1, a microwave drying cavity; 2. a polytetrafluoroethylene conveyor belt; 3. a hot air diffusion device; 4. a dehumidifying device; 5. a magnetron; 5.1, a temperature sensor; 5.2, a temperature sensor; 6.1, a humidity sensor 1; 6.2, a humidity sensor 2; 7. an infrared thermal imager; 8. a cut-off device; 9. a condensing unit; 10. a condensed water pipeline; 11. a condensate recovery device; 12. an air heating device; 13. a hot air fan; 14. a mode stirrer;
FIG. 2 is a schematic view of the internal operation of the hot air diffusing device 3; FIG. 15, temperature sensor; 16. hot air, 17, control valve sensor; 18. a hot air inlet; 19. an air supply device;
FIG. 3 is a partial workflow of the system control module.
Detailed Description
Fig. 1 is a schematic diagram of a tunnel type microwave drying synthetic leather waterborne polyurethane coating device in embodiment 1 of the invention, as shown in the figure: the device comprises a microwave drying cavity 1, wherein a plurality of power-adjustable magnetrons 5 are installed at the top end of the cavity 1, 2 temperature sensors are installed inside the magnetrons, the industrial production is considered to be a continuous production process, and the temperature of the magnetrons inevitably rises very fast under the continuous working condition. When the temperature sensors 5.1, 5.2 detect that the working temperature of the magnetron is too high, the system connects the low-temperature condensed water in the condensed water recovery device 11 to the magnetron 5 through the pipeline 10 for reducing the working temperature of the magnetron. When the condensed water is not enough, the magnetron starts the water-cooled magnetron equipment of the magnetron. An infrared thermal imager 7 and humidity sensors 6.2 and 6.1 are arranged on the upper part of the drying cavity 1, a mode stirrer 14 for increasing the uniformity of an internal field is arranged on the upper end of the drying cavity 1, a polytetrafluoroethylene conveyor belt 2 for conveying a waterborne polyurethane coating is arranged on the lower end of the drying cavity, and stoppers 8 with the height controlled within 7cm are arranged on the left side and the right side of the cavity.
When the microwave equipment starts to work, the conveyor belt 2 is started to work, the required dry synthetic leather waterborne polyurethane coating is conveyed into the cavity 1, the humidity sensor 6.1 at the tail end of the conveyor belt detects the air humidity in the drying cavity 1 in the drying process, as shown in figure 2, the detection result is fed back to the control chip, when the air humidity content in the cavity is detected to be larger than the upper limit value which is not beneficial to drying the coating, the control module starts the dehumidifying device 4 to pump out the humid air in the cavity, and the dehumidifying work is stopped until the detected humidity content in the cavity 1 is lower than the upper limit value of drying the coating. The damp and hot gas to be taken out is processed through the condensing device 9, the low-temperature condensate water generated after the damp air is condensed and liquefied is recovered through the condensate water recovery device 11, and the recovered condensate water is connected to the magnetron equipment, so that the working temperature of the magnetron is reduced, the magnetron equipment is protected, the full utilization of the condensate water is realized, and meanwhile, the full work of the water cooling device is guaranteed. The dry air discharged through the condensing unit 9 is heated by the air heating unit 12 to generate hot air.
As shown in fig. 2, a hot air fan 13 sends blown hot air to a hot air diffusion device 3, in order to solve the defects that the hot air is uneven in wind speed and the synthetic leather surface is easy to wrinkle, a plurality of independent air supply devices 19 are installed inside the hot air diffusion device 3, control valves and control valve sensors 17 are installed at air supply ports, and a temperature sensor 15 is installed at an air outlet, so that when the water-based polyurethane coating is dried by microwave energy, an infrared thermal imager 7 at the upper end of a drying cavity monitors the temperature distribution of the surface of the coating inside the whole cavity in real time, and the high temperature region, the proper temperature region and the low temperature region of the surface of the coating inside the cavity are determined. When the temperature of some areas on the surface of the coating is monitored to be low and not beneficial to surface drying, the position of the area is accurately fed back to the upper computer through a multipoint data acquisition and positioning function, on the other hand, the humidity sensor in the cavity simultaneously acquires the humidity data in the cavity and feeds the area humidity data back to the upper computer, the upper computer controls the valve sensor 17 through the control module to close the air supply devices in the temperature-suitable area and the high-temperature area, and simultaneously opens the air supply devices 19 in the low-temperature area and the high-humidity area, so that the working flow of hot air in the high-humidity area and the low-temperature area on the surface of the coating is increased, the temperature rise of the target area is accelerated, the surface drying of the coating is accelerated, and the.
The quality of the synthetic leather coating is influenced by the overhigh temperature of hot air, a temperature sensor 15 is arranged at the air supply opening of each device, and when the overhigh temperature of the collected air supply is detected, the air supply amount is adjusted by adjusting the size of the opening of the valve, so that the reduction of the energy input of the hot air is realized.
The infrared thermal imager 7 positioned in the drying cavity collects temperature data of the surface of the synthetic leather waterborne polyurethane coating and feeds the temperature data back to the control module, meanwhile, the humidity sensor 6.2 detects the humidity of the middle coating, when the collected temperature data is lower than the temperature required by the drying of the waterborne polyurethane coating or the humidity in the cavity is larger, the control chip reduces the speed of the conveying belt 2 through the speed sensor in a self-adaptive manner, the dead time of the conveying belt in the cavity is increased, the microwave and hot air drying time is prolonged, when the collected temperature data is higher than the temperature required by the drying of the waterborne polyurethane coating or the humidity of the tail end coating is smaller, the speed of the conveying belt 2 is increased in a self-adaptive manner by the control chip, the drying efficiency and the production efficiency are greatly improved, and an operator does not need to observe the drying.
For the water-based polyurethane material for drying coatings with different thicknesses, the equipment can set different gear powers to dry the coatings with different thicknesses.
The above description is of the preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Under the premise of the technical principle of the invention, a plurality of substitutions and improvements can be made and are included in the protection scope of the invention.
Claims (7)
1. A microwave drying synthetic leather waterborne polyurethane coating device comprises a microwave drying cavity (1), a magnetron (5) which generates microwave radiation to the synthetic leather with a waterborne polyurethane coating to be dried in the microwave drying cavity (1); the method is characterized in that: the microwave drying cavity comprises a microwave drying cavity (1), a dehumidifying device (4) for extracting damp-heat gas generated by drying the synthetic leather of the aqueous polyurethane coating to be dried, the damp-heat gas extracted by the dehumidifying device (4) is input into a condensing device (9), the microwave drying cavity further comprises a condensed water recycling device (11) for recycling condensed water generated by the condensing device (9), and the condensed water recycled in the condensed water recycling device (11) is output to enter a cooling water input end of the magnetron (5).
2. The microwave drying synthetic leather waterborne polyurethane coating device of claim 1, wherein: also comprises a hot air diffusion device (3); the hot air diffusion device (3) sends the dry gas condensed and dehydrated in the condensing device (11) into the microwave drying body (1).
3. The microwave drying synthetic leather waterborne polyurethane coating device of claim 1, wherein: also comprises a hot air diffusion device (3); the hot air diffusion device (3) feeds the drying air generated by the condensing device (11) into the microwave drying body (1).
4. The microwave-dried synthetic leather waterborne polyurethane coating apparatus of claim 2 or 3, wherein: the hot air diffusion device (3) is internally provided with a plurality of mutually independent air supply devices (19) for supplying air into the microwave drying cavity (1), and the air supply devices (19) are distributed on the side wall of the microwave drying cavity (1).
5. The microwave-dried synthetic leather waterborne polyurethane coating apparatus of claim 2 or 3, wherein: a conveying belt (2) for conveying the synthetic leather with the waterborne polyurethane coating to be dried into the microwave drying cavity (1) is arranged on the lower side of the microwave drying cavity (1), and stoppers (8) for preventing microwave leakage are respectively arranged on the front and the back of the microwave drying cavity (1) on the conveying belt (2); and a metal filter screen for preventing microwave leakage is arranged at the inlet of the dehumidifying device (4).
6. The microwave-dried synthetic leather waterborne polyurethane coating device of claim 5, wherein: the microwave leakage prevention cut-off device (8) is composed of 1/4 wavelength waveguide grooves at two ends of the microwave drying cavity (1), and the height between the plane where the top of the 1/4 wavelength waveguide groove suppressor is located and the plane where the bottom of the microwave drying cavity (1) is located is 7 cm.
7. The microwave-dried synthetic leather waterborne polyurethane coating device of claim 4, wherein: an infrared thermal imager (7) and a humidity sensor (6) are arranged in the microwave drying cavity (1), and a temperature sensor (15) for detecting the air temperature is arranged at the outlet of an air supply outlet of the air supply device (19); the inlet of the air supply outlet of the air supply device (19) is provided with a control valve and a control valve sensor (17), and the air supply device also comprises a control module; the output ends of the infrared thermal imager (7), the humidity sensor (6), the temperature sensor (15) and the control valve sensor (17) are respectively connected with the control module; and the control module controls the fan rotating speed of the dehumidifying device (3), the condensing speed of the condensing device (9), the fan rotating speed of the hot air diffusion device (3) and the conveying speed of the conveying belt according to the output data of the infrared thermal imager (7), the humidity sensor (6), the temperature sensor (15) and the control valve sensor (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910878590.0A CN110608595A (en) | 2019-09-18 | 2019-09-18 | Microwave drying synthetic leather waterborne polyurethane coating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910878590.0A CN110608595A (en) | 2019-09-18 | 2019-09-18 | Microwave drying synthetic leather waterborne polyurethane coating device |
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| CN110608595A true CN110608595A (en) | 2019-12-24 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112981970A (en) * | 2021-03-09 | 2021-06-18 | 四川大学 | Microwave-hot air coupled water-based synthetic leather drying process |
| CN114850008A (en) * | 2022-06-08 | 2022-08-05 | 浙江嘉柯新材料科技有限公司 | Microwave drying device and process for synthetic leather waterborne polyurethane coating |
| CN115569824A (en) * | 2021-06-21 | 2023-01-06 | 四川大学 | Microwave drying device for leather coating |
| EP4106041A4 (en) * | 2020-12-03 | 2023-10-18 | LG Energy Solution, Ltd. | Electrode drying system and electrode drying method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4106041A4 (en) * | 2020-12-03 | 2023-10-18 | LG Energy Solution, Ltd. | Electrode drying system and electrode drying method |
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| CN115569824A (en) * | 2021-06-21 | 2023-01-06 | 四川大学 | Microwave drying device for leather coating |
| CN114850008A (en) * | 2022-06-08 | 2022-08-05 | 浙江嘉柯新材料科技有限公司 | Microwave drying device and process for synthetic leather waterborne polyurethane coating |
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Application publication date: 20191224 |