UV LED Curing & UVC Air Disinfection Faqs

UV Curing Faqs

  • 16 uv led 365nm application industry
    1. Hard disk head assembly (read and write head packaging, gold wire fixing, bearings, coils, chip bonding, etc.) 2. Motor and component assembly (wire, coil fixation, coil end fixation, PTC/NTC component bonding, transformer core protection) 3. DVD/Digital Camera (Lens, Lens Paste, Circuit Board Reinforcement) 4. Sensor production (gas sensor, photoelectric sensor, optical fiber sensor, photoelectric encoder, etc.) 5. Assembly of mobile phone components (camera lens, earpiece, microphone, shell, LCD module, touch screen coating, etc.) 6. TFT-LCD liquid crystal panel filling port package 7. TFT-LCD liquid crystal panel FPC paste package 8. Capacitive screen bonding and curing 9. LED VU light curing application in PCB industry 10. Optical industry-ST-LED UV curing application 11. Laser UV encapsulation curing applications 12. Optical component assembly (lens group, prism, DLP optical engine assembly, CCD, COMS) 13. Optical communication industry components (PLC splitter, wavelength division multiplexer WDM, arrayed grating waveguide AWG and other glass packaging structures bonding or potting, fixing of small components, etc.) 14. Research and institutes-ST-LED UV curing application 15. Device LED UV light source curing application 16. Optical communication industry components (PLC splitter, wavelength division multiplexer WDM, arrayed grating waveguide AWG and other glass packaging structures bonding or potting, fixing of small components, etc.)
  • Which products are the 365nm UV curing systems suitable for?
    In uvled, the ultraviolet light in the 365nm band belongs to the pure ultraviolet light output, and the monochromatic light does not contain infrared rays, which avoids the cured part from being affected by the radiation in the light band beyond 350nm~400nm. The UVLED light curing machine with a wavelength of 365nm can effectively reduce the temperature rise of the illuminated workpiece because it does not contain infrared rays and radiant heat. It is more suitable for processing applications that require low temperature, high precision and minimum thermal deformation of bonding, such as optical lens assembly , and usually the wavelength band of curing uv glue is also 365nm.
  • Which wavelength of UV curing is suitable for curing furniture, floor and wood
    UV paint, UV coating, UV resin, etc. normally choose to use a UVLED curing machine in the 390-405nm band to meet the curing requirements.
  • Which wavelength of UV light is suitable for bonding and sealing curing?
    UV glue, UV varnish, etc. normally need to use a UVLED curing machine in the 360-370nm band, and some UV glues with special formulas can also use the 390-405nm band
  • Which wavelength is suitable for UV printing
    The UV ink normally chooses to use the 380-390nm band, and the UV ink normally chooses to use the 395-405nm band UVLED curing machine to meet the curing requirements.
  • Advantages of light curing
    1. One-component system without mixing, easy to use; 2. The curing speed is fast, the curing can be completed in a few seconds to tens of seconds, and the fixing performance is good; 3. Shorten the production time and improve production efficiency; 4. No pollution, no solvent, 100% curing, basically no air pollution and waste water pollution.
  • Light curing mechanism
    The UV light curing system is divided into a free radical system and a cationic system. The components of the curing mechanism of the two are different. The free radical system is excited by the photoinitiator by UV irradiation to generate free radicals, which initiates the polymerization and crosslinking of monomers and prepolymers; In the cationic system, a strong protonic acid is generated by irradiation of a cationic photoinitiator, which catalyzes addition polymerization and cures the resin.
  • UV Air Purifier

  • The difference between air cooling and water cooling
    1. The mode of heat dissipation is different. Air cooling uses a fan to introduce cold air and takes away the heat through the heat sink to complete the heat dissipation process. Water cooling uses liquid to force the circulation of the radiator under the drive of the pump to take away the heat of the radiator; 2. The medium is different. Air cooling uses wind to dissipate heat, the medium is air, and water cooling uses coolant; 3. Heat dissipation module design, air cooling can be simply divided into heat pipes, heat sinks and fans. Some heat dissipation devices do not have fans and rely on air duct design to achieve passive heat dissipation, while water cooling is divided into cold heads, water pumps, cold drains and connected water pipes. , through the water pump to complete the circulation of the coolant between the cold head and the cold row to achieve the effect of heat dissipation.
    Ultraviolet rays are electromagnetic waves which form part of light. Electromagnetic waves are divided into three main wavelength bands, expressed in nanometres (nm): UV-A (315-400 nm) with tanning properties; UV-B (280-315 nm) with therapeutic and vitamin “D” synthesising properties; UV-C (100-280 nm) with germicidal properties.
    UV-C rays (100-280 nm) have a strong germicidal effect and reach their maximum efficacy at the 275 nm wavelength. The germicidal effect of UV-C radiation covers bacteria, viruses, spores, fungi, moulds and mites; this is mainly due to the destructive effect of the UV-C rays on their DNA, which damage their reproductive system and prevent them from replicating.
    These lamps have an emission of around 90% over the 253.7 nm/275nm wavelength. This frequency is invisible to the human eye and has a strong germicidal power. The remaining 10% of the lamp’s emission is visible (typically appearing as a blueish light).
    Yes, UV-C rays are found in nature as they are generated by the sun, but the ozone layer in the atmosphere acts as a shield which stops them from reaching the earth’s surface.
    Bacteria, viruses, spores, fungi, moulds and mites are all sensitive to UV-C rays and can be eliminated by them. Microbes cannot acquire resistance to UV-C rays, which only occurs using chemical disinfectants and antibiotics. UV rays are eco-friendly. When using normal disinfectants, environmental pollution is inevitable. They also carry severe risks from the direct inhalation of vapours or the ingestion of foods contaminated after coming into direct contact with chemical disinfectants. Where the use of chemical disinfectants is unavoidable (food/pharmaceutical/healthcare industries, etc.), using ultraviolet rays in the disinfection process can reduce the amount needed, which allows for significant cost savings and is better for the environment, while maintaining – and, most of the time, improving – disinfection quality. UV-C ray devices can be installed in most environments and machinery and can be programmed to maintain the same level of disinfection day and night, ensuring ideal conditions of hygiene without any fluctuation in quality. In contrast, chemical disinfectants are most effective at the time of use.
    UV-C rays are used every day, primarily in: Food and pharmaceutical industries, for disinfecting air and surfaces in production spaces, disinfecting product containers (packaging), isolating “protected” areas for product manufacturing and packaging (such as clean rooms), and areas at risk of contamination. These procedures significantly increase the safety and conservation of the products we purchase and provide multiple health benefits since they leave no residue and help reduce or even eliminate the need for chemical disinfectants, which can leave harmful residues on products. Hospitals, for preventing the transmission, and therefore contagion, of dangerous bacteria or viruses that may be found in the air or carried following contact with infected persons or visitors, such as TBC and Legionella. Air conditioning systems, for preventing the problematic and harmful build-up of mould and bacteria in air treatment systems or ducts, which can cause Building Related Illnesses (BRI), extrinsic allergic alveolitis, viral, fungal and Rickettsial infections, bronchial asthma, humidifier fever, Pontiac fever and Legionnaire’s disease, asthma and Sick Building Syndrome. Many armies use UV-C systems to prevent biological attacks such as the dispersal of anthrax in pipelines. Systems for treating water intended for human and animal consumption and for sanitary use, to eliminate any microorganisms that may be found in water deriving from wells, cisterns and aqueducts. The system must be installed after an active carbon filter, such as in water distributors, which are becoming increasingly common in cities. There are no limits to the possible applications of UV-C rays. Even in domestic environments, they are used to prevent build-up of mould on walls, eliminate mites from bedrooms, keep room air healthy and treat water. UV-C rays are even able to eliminate odours and fatty deposits in industrial kitchens and in the restaurant industry in general, in conjunction with the emission of ozone.
    Bacteria, viruses, spores, fungi, moulds and mites are all sensitive to and eliminated by UV-C radiation.
    Each bacterium, virus, yeast, mould or mite requires a different UV-C dose to be deactivated or eliminated. There are widely recognised documents which report these levels. To give an approximate idea regarding the application times of UV-C rays, these can range from fractions of a second to several seconds.
    Viruses, bacteria and mould, animal waste, mites and pollens are among the main causes of dangerous infections and allergies. Each of these contaminants is dispersed in a different way: mites, spores, bacteria and mould, for example, are continuously transported by air, while other bacteria and viruses are “grouped” into solid particles, such as spores or drops of moisture, and then inhaled by humans. In air conditioning systems, when contaminants get inside the air treatment unit (ATU) and air distribution ducts, the system, which is dark and moist, becomes a breeding ground for them to grow and multiply, making the air we breathe unsafe. The air also contains concentrations of chemical pollutants which are dangerous if inhaled in large quantities or on a continuous basis. Irradiating air in a central system or installing an air purifier complete with UV-C lamps and a TiOx titanium dioxide filter greatly reduces the likelihood that these pollutants (whether microbiological or physicochemical) will result in health problems that often can only be diagnosed after many years.
    When a UV-C light is turned on, the number of microbes in the air and on all surfaces reached by the UV rays is reduced significantly. For example, in just a few minutes the bacteria Bacillus, Coli, Clostridium, Legionella, Vibrio, Salmonella, Listeria, Pseudomonas, Staphylococcus, Streptococcus, etc. can be reduced by 99% at a distance of 3 m from the device. This enables the system to reach areas that would otherwise be unreachable with solid objects such as cleaning products and disinfectants, like hidden areas in flooring and furniture. Where chemical disinfectants must be used, irradiating the surfaces prevents black-out areas, does not generate resistant species and can be used both day and night (without human presence), avoiding rapid re-contamination of surfaces and keeping them constantly in optimal microbiological conditions.
    UV-C rays cannot penetrate solid bodies, unlike ionising radiation such as x-rays and gamma rays, both of which are highly dangerous to humans, even at low doses. To eliminate microorganisms using UV-C rays, they must be present on the surface of an object or transported by the air.
    There are very few materials that will not block the passage of the germicidal wavelength (253.7 nm/275nm, invisible), including quartz and certain plastics such as PE or tetrafluoro-derivatives, but only if these are just a few microbes thick. Regular window glass, polycarbonate and other transparent materials through which it is possible to see the bluish light of UV-C lights completely nullify their germicidal effect, acting as a screen.
    Continuous irradiation of the eyes and skin could cause erythema and conjunctivitis, which normally clear up in a few hours. In any case, it is sensible to avoid direct, close-up exposure to sources of UV-C rays even for short periods of time. To avoid direct exposure simply cover the area to be protected using any material that is not transparent to visible light (cotton or woollen clothing or overalls) or using glass or transparent plastics (masks, helmets, glasses, etc.).
    UV-C rays are similar to solar rays, but do not transmit heat. However, like solar rays, they tend have a yellowing effect on plastics that are exposed for long periods of time (especially white plastics).