IR Lamp Technologies & News

IR Heating Applications

Infrared Heaters For Automotive Industry Film Laminating Machines

Infrared Heaters For Automotive Industry Film Laminating Machines

First of all, we need to know that infrared heating technology uses infrared radiation lamp as the heat source. Its wavelength range is 1-1000 microns. It can penetrate transparent materials and directly heat target objects. It is gentle, uniform and efficient. Compared with traditional heating methods, infrared heating technology can improve heating efficiency, reduce energy loss, and has good environmental adaptability. In the field of laminating machines, infrared heating technology is widely used in the heating and forming processes of various film materials to improve production efficiency and product quality.     At the same heating temperature, the heating time of the laminating machine using infrared heaters is shortened by an average of 30% compared with traditiona heating methods such as conduction. This data shows that infrared radiation can transfer energy into the material more quickly and heat more efficiently. This is mainly due to the fact that infrared radiation can be effectively absorbed by the thin film material and can produce effective heat transfer within the material, thereby achieving a rapid and uniform heating process.     In addition, laminating machines using infrared heating technology improve film thickness uniformity surface flatness of film by 20% compared with traditional heating methods. This due to infrared radiation can effectively stimulate the vibration and rotation of molecules inside the film material, promote heat conduction and interaction between molecules, and make the interior of the material heated more uniformly. This further improves product stability and quality.   Besides infrared heating technology also significantly improves the flatness of the film surface. Physically, this may be related to the fact that infrared radiation can effectively penetrate transparent materials and produce thermal effects on the surface of the materials. Iinfrared radiation can directly act on the surface of the material and stimulate molecular vibration, making the surface of the film more uniformly heated, thus achieving a significant improvement in the flatness of the film surface.  

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Some Suggestions For Distributing Infrared Lamps in Drying Oven

Some Suggestions For Distributing Infrared Lamps in Drying Oven

Some Suggestions For Distributing Infrared Lamps in Drying Oven           1.Because the radiant heat of infrared rays propagates in a straight line, the spacing and arrangement of the infrared radiation heaters in the furnace must be considered so that the heated objects can be fully irradiated.   2.Considering the principle of infrared heating, for some applications it is no need to keep warming for drying room. However, maintaining the temperature in the furnace plays a large role in the heating and drying effect of infrared rays. According to the principle of hot air rising, more infrared heaters should be configured in the lower part of the drying chamber and less in the upper part.   3.The shorter the distance between the infrared radiator and the heated objects, the higher the efficiency. There are tests show that using a high effient quartz infrared heaters to irradiate a 100×150 mm coated-rolled iron sheet. It took 5 minutes to dry at a distance of 100 mm, 16 minutes to dry at a distance of 200 mm, and 32 minutes to dry at a distance of 300 mm. However, if the irradiation distance is too close, it will bring the disadvantage of uneven heat distribution, so the general distance is 150~400 mm. For infrared heating by conveyor speed, there is no need to worry about uneven heat. The general distance is 50 mm, which has a better effect of speeding up the transmission speed. The distance between each infrared radiation heater is generally 120~150 mm. All parameters are only for reference.     4. The infrared drying room does not require forced circulation of hot air, so the purpose of exhaust is only to discharge the organic gas volatilized by the coating film to prevent an explosion accident caused by excessive organic gas concentration.   Along with infrared heating has been rapidly applied in coating film drying, such as carbon medium wave-infrared heaters that have strong radiation in a specific wavelength range and are suitable for coating film absorption.  

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2024

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Infrared Heating In Coating Film Drying Application

Infrared Heating In Coating Film Drying Application

Infrared Heating In Coating Film Drying Application 1. Absorption of infrared rays by coating film   Infrared ray is a kind of ray invisible to the naked eye. It propagates in a straight line like visible light, and has phenomena such as wave reflection, refraction, absorption and transmission. Its main energy wavelength is in the range of 1.0 to 16 microns. Resins, solvents, and even inorganic substances such as pigments in paints have wider and stronger absorption bands in this wavelength range. Usually, 50% of infrared rays are absorbed by the coating film, and the rest passes through the coating film and is absorbed by the coating. The coating film absorbs infrared rays, which intensifies the vibration of internal molecules and increases energy, accelerating the polymerization of organic resin and the use of solvents, achieving the purpose of rapid drying. The infrared rays that pass through the coating film and are absorbed by the coating material cause the temperature of the coating material to rise. Accordingly, the temperature of the inner layer of the coating film is slightly higher than that of the outer layer, forming a process in which the inner layer of the coating film gradually dries toward the outer layer, and the solvent flows through without hindrance. It evaporates from the inside out, shortening the drying process and making the coating film hard and bright.     2. Comparison between infrared heating and hot air heating Hot air drying uses conductive convection to heat the coating, which is much slower than infrared radiation heating. In particular, hot air drying uses convection hot air to transfer heat to the coating film. The outermost layer of the coating film is first exposed to the hot air, so the outer layer of the coating film is the first to solidify. This hinders the evaporation of the solvent in the inner layer of the coating film and the entry of oxygen in the air (for oxygen polymerized resin), and reduces the drying speed. When the solvent in the inner layer finally breaks through the outer coating and evaporates, it leaves micropores in the outer coating and makes the coating loose.     There is obvious absorption efficiency difference caused by different colors of the coating film. The darker the color, the greater the absorption rate, and the lighter the color, the smaller the absorption rate. This causes uneven curing of the coating film due to different colors. Our quartz infrared radiators are made by high temperature tungsten alloy or nickel and chromium high temperaure alloy, which heating elements are vacuum sealed or unsealed in quartz glass. The infrared wavelengths they radiated are from 1.0～16.0 microns, which can match coating films in different colors.     Infrared heating and drying technology shortens the drying time of the coating film from dozens of minutes to a few minutes, and reduces the length of the effective drying tunnel from a dozen meters to a few meters. The power saving is generally 35~40%, and some are as high as 70%. Due to infrared heating is efficient and quick-drying, takes up less space in the drying tunnel, has good drying quality, and saves energy, so it is quickly adopted in coating film drying.    

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2024

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Medium Wave Infrared Lamp Drying For Leather Coating

Medium Wave Infrared Lamp Drying For Leather Coating

Infrared heating is a drying method that uses radiation to transfer heat. Emitting radiant energy is an inherent characteristic of various materials. When electrons inside the atoms of a material are excited and probed, alternating electric and magnetic fields will be generated, emitting electromagnetic waves. And propagates into space, which is radiation. Different excitation methods have different wavelengths of electromagnetic waves. The electromagnetic waves generated due to their own temperature or thermal movement are thermal radiation.     The electromagnetic radiation with a wavelength of 0.75 ~1000μm generated by the infrared or far-infrared emitter propagates straight to the dried leather at the speed of light. When the frequency of the emitted infrared  is related to the molecular motion in the leather, and matched the natural frequency of the leather, and the wavelength of the infrared radiation is equal to the wavelength absorbed by the leather, the molecules in the leather will intensify their movement, the absorbed infrared radiation energy is converted into heat energy, the temperature of the leather rises, and the water in it vaporizes, thereby drying the leather.   Every object has at least one absorption band in the electromagnetic spectrum. The fewer the absorption bands of an object, the weaker the absorption, and the smaller the ability of the material to absorb infrared radiation. For example, air has very little ability to absorb infrared radiation. Liquid water is one of the most active absorbers of infrared radiation. Dry substances generally easily transmit short-wave infrared radiation, but the presence of water in these substances significantly enhances their ability to absorb infrared radiation. Therefore, materials such as cellulose, sheepskin, felt and leather semi-finished products are particularly suitable for drying by radiation. Since leather absorbs infrared radiation, infrared radiation with a wavelength of 2.0μm ~ 6.0μm has a particularly significant drying effect on leather.   Leather is a thin, porous polymer material. During infrared drying, part of the energy will penetrate the leather, so that both the surface and the interior of the leather can obtain heat energy. As the water on the surface of wet leather continues to evaporate and absorb heat, the surface temperature of the leather will decrease, which will cause the internal temperature of the leather to be higher than the surface temperature, forming a temperature gradient, making the heat diffusion direction of the leather from the inside to the outside. At the same time, due to the temperature inside the leather Moisture movement caused by gradient always diffuses from the interior with more moisture content to the exterior with less moisture content. The wet diffusion of moisture inside the leather is in the same direction as the thermal diffusion, which will also accelerate the diffusion process of moisture, thereby improving Drying efficiency.                                                           Since the depth of radiation penetrating an object (the penetration depth) is roughly equal to the wavelength, medium or far infrared radiation with a longer wavelength has a better drying effect than near-infrared radiation. In particular, the emission frequency of medium-infrared radiation matches the natural frequency of molecules of polymer plastics, water, etc., which will cause the molecules of these materials to resonate violently, and these materials have strong absorption peaks for medium-infrared radiation. After medium or far-infrared radiation penetrates into the interior of these substances, it is also easily absorbed by these substances. Therefore, using medium or far-infrared radiation to dry leather is more effective than using infrared or near-infrared radiation.  

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2024

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Leather Curing Advantages With Quartz Infrared Radiation Heater

Leather Curing Advantages With Quartz Infrared Radiation Heater

Leather curing or drying with quartz infrared radiation has the following characteristics: (1) The use of high efficient-infrared heaters to dry leather is relatively fast, much faster than the general use of steam hot air convection and heat conduction dryers to dry leather. Because the transmission of infrared radiation energy is direct, it can directly reach the surface of the leather without passing through any intermediate medium, and part of the radiation can penetrate into the interior of the leather pores, with a penetration depth of up to 0.1 mm~2.0mm. The radiation from the capillary pores is almost completely absorbed after a series of reflections by the pore walls, so the heat transfer efficiency is very high. For the same leather, drying with far-infrared radiation can greatly shorten the drying time. (2) The drying quality is good. Since the surface layer of the leather and the inner layer below the surface absorb far-infrared radiation at the same time, the drying is relatively uniform. After drying, the physical properties of the leather are better and the color is improved. (3) Compared with other radiation drying and other electric drying methods, quartz infrared radiation drying consumes less energy, more than 50% of the energy be saved. Furthermore, the infrared radiating element of the infrared dryer has a simple structure, small equipment size, and is easy and safe to operate. Although high efficient-infrared drying has the above advantages, there are still two points that need to be paid attention to when drying: (1) When infrared radiation is used to dry leather, the leather area shrinks greatly, 20% to 30% for grid leather and 4% to 6% for base leather. Therefore, it is best to dry in a constrained state (fixed state). (2) Due to the infrared drying, the heat supplied to the leather and the water is much greater than when using the steam method, even dozens of times higher. The external heat source provides strong heat, and the temperature difference between the leather surface and the interior of the leather is large. Therefore, infrared radiation heater is most suitable for drying thin leather and drying the leather surface after painting.

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2024

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Infrared radiation heaters in paper and dyeing equipment

Infrared radiation heaters in paper and dyeing equipment

There are three basic ways to heat objects: conduction, convection, and radiation. Infrared heating is a type of radiation heating. Infrared radiation energy is a kind of electromagnetic energy. It is an electromagnetic wave emitted by an excitation source. The electromagnetic wave propagates in space at the speed of light. Once it encounters an object, it will cause the basic particles that make up the object to produce resonant motion. The energy contained in it will be directly absorbed by the object and converted into The internal energy of an object - heat energy, causes the object to heat up rapidly, achieving the effects of dehydration, drying and high-temperature shaping.         The basic theory of infrared heating technology is the "spectral matching absorption principle", that is, any substance has its fixed excitation and absorption infrared spectrum bands. Only when the radiation wavelength of the heating element is consistent with the main absorption band wavelength of the heated element, its radiant energy will be It is absorbed and converted into heat energy, otherwise the energy cannot be effectively absorbed by the material, but will cause great waste. With the continuous efforts of our country's scientific researchers, infrared heating technology has exerted the following effects on printing and dyeing equipment:     (1) The comprehensive energy saving rate reaches more than 40%. (2) The traditional craftsmanship of the shaping machine has undergone a leap forward. Mainly reflected in the setting time, the traditional process requires the setting time to be no less than 20s, but after applying the infrared directional radiator, it only takes 10~12s, which almost shortens the time by half. It also meets the quality requirements and reflects the fast infrared heating speed, Features of strong penetrating power. (3) The equipment structure and maintenance volume are reduced. After applying infrared directional radiation heating technology, facilities such as boilers, pipes, circulating fans, and air ducts can be eliminated, greatly simplifying equipment structure and maintenance work. (4) The temperature accuracy is higher. The temperature system adopts intelligent continuous output control, making the radiation temperature control extremely accurate and simple.   Energy saving and consumption reduction are one of the important ways for enterprises to reduce costs, and reducing pollution is the fundamental requirement of future society for environmental protection. This provides broad prospects for the application of electric power infrared heating in the printing and dyeing industry.    

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2024

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Share Knowledges Infrared Radiation Heating in Coating Curing

Share Knowledges Infrared Radiation Heating in Coating Curing

Design and application of infrared radiation heating technology in coating curing   Coating curing technology generally uses hot air circulation heating. The air circulation heating have uniform temperature in the furnace and the work adaptability is strong. But the disadvantages are high energy consumption, slow heating for  thick curing workpieces, and the equipment occupies a large area. In order to overcome the shortcomings, infrared radiation heating technology heats the workpieces from the inside to the outside, solving problems such as high energy consumption and slow heating rate.     Although the infrared radiation heating has the advantages of high heat exchange efficiency, fast response and short drying time and good coating curing quality, it also has shortcomings such as uneven temperature field in the curing box and shadows on workpieces with complex shapes, which ultimately affects the coating and dry quality. In order to overcome the above-mentioned shortcomings caused by simply using infrared drying, a cold air circulation system and a hot exhaust air system are set up in the high-temperature area together with ​​infrared drying. The air volume and wind speed of both are adjustable. When designing, attention should be paid to the exhaust system. The air volume should be slightly larger than the air volume of cold air sent into the system. After production and operation of the equipment, it has been proved that the effect is very good. This is because the cold air sent to the oven drives the hot air circulation in the curing box, which can not only transfer heat evenly to all parts of the complex-shaped workpiece, but also overcomes the inevitable shortcomings of shadows caused by radiation heat transfer. It can also blow away the air film layer adsorbed on the surface of the workpiece, thereby accelerating the external diffusion rate of the workpiece, causing the solvent and water vapor to quickly discharge from the drying chamber, and reducing the relative humidity and solvent concentration in the box.     The effect of infrared radiation heating technology in paint film curing     In order to test the design and use effect, after the project installation and debugging was completed, the temperature rise of the entire curing box was tested using a six-point furnace temperature tracker and temperature measurement software. During the heating stage, the heating speed of each part of the workpiece is inconsistent. The closer to the upper part, the faster the heating speed, and the overall heating time is longer.   After installing an infrared radiation heater at the inlet, the workpiece heats up faster and the heating time is greatly shortened; the temperature curves of each part of the workpiece have a high degree of overlap, the curve rises steadily during the heating stage, and the curve fluctuates very little during the heat preservation stage. It is not difficult to see that after being heated by the infrared radiation heating system, the temperature curves of various parts of the workpiece almost overlap, indicating that the synchronization of temperature rise on the surface of the workpiece has been greatly improved, the workpiece is heated more evenly, the paint film solidification effect is better, the heating time is greatly shortened, and after heating After this stage, the temperature in the entire curing box remains more stable with very small fluctuations.   Conclusion   1) In the paint film curing box, the infrared heating system is suitable to be arranged in the entrance heating section. Infrared radiation drying technology is used in the heating stage, and forced convection drying technology is still used in the second half. The combination of the two technologies makes the design more optimized and reasonable.   2) The infrared heating components should be reasonably partitioned and grouped according to the design conditions, and the temperature control elements should be scientifically arranged. This is conducive to the temperature control and debugging of radiation drying, making the temperature rise more stable.   3) The optimized design of the infrared heating system structure enables three-dimensional adjustment of the relative position to the workpiece in a limited space.   4) The infrared heating area is equipped with a forced hot air circulation system, which is beneficial to the uniform heating of the workpiece and improves the curing effect of the paint film.  

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Infrared heating technology in tea drying process

Infrared heating technology in tea drying process

Infrared heating technology in tea withering After a series of studies, it was found that the application of infrared heating technology in tea withering can improve the quality of tea.     After a series of experimental studies, the best relevant parameters for tea processing are as follows: the power of the microwave oven is determined at 10kw, the amount of leaves is 0.5kg per minute, and the infrared setting is 6kw. When curing tea leaves, first use a microwave oven to irradiate them for 1.5 minutes, and then use the same practice of infrared radiation. In the use of this processing technology, the quality of the tea produced is higher than that of ordinary tea, and the cost of the process is relatively low, which is more in line with people's actual needs. And the application of this technology in tea withering mainly uses advanced microwave-infrared mechanical equipment and infrared electric heating continuous withering equipment, which can make ideal tea even on rainy days.   For example, when withering oolong tea, the withering temperature is mainly adjusted to about 40 degrees Celsius, and infrared radiation with an intensity of 1kW is used to heat and wither the tea leaves. Other processing steps are carried out according to normal procedures. The oolong tea made in this way can bring people a better olfactory experience, with a very rich and mellow aroma, and has a higher quality than oolong tea processed in conventional ways. Mainly because, the heat generated by infrared heating is used to process the mesophyll tissue in the tea leaves in the form of infrared radiation rays, causing it to generate a certain amount of heat energy and improve the uniformity of the tea leaves' heating.   The use of infrared heating technology in the tea baking process is high efficient, short drying time, which helps to save various costs. Compared with the traditional hot air drying method, infrared heating can effectively retain the aroma of tea leaves. Compared with microwave heating and drying technology, infrared heating not only enables the tea leaves to be heated evenly during processing, but also avoids the loss of water in the tea leaves, effectively retains the natural aroma of the tea leaves, and improves the production of tea leaves. Infrared heating technology is more in line with people's needs in heating and baking tea, which can save people more costs in the processing and manufacturing of tea.  

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