The principle and advantages of deep UV LED sterilization？

UVC sterilizer

The COVID-19 has made "disinfection" a high-frequency vocabulary, and 75% strength alcohol, 84 disinfectant, and no-handwash liquid have been mentioned again and again.

In the "New Coronavirus Infected Pneumonia Diagnosis and Treatment Program (Trial Version 5)" issued by the National Health and Health Commission, "the virus is sensitive to ultraviolet rays and heat", and ultraviolet sterilization has become a hot spot. In the past, ultraviolet sterilization and disinfection were often used as sterilization and disinfection methods in special scenes such as hospitals, and consumers are relatively new to ultraviolet sterilization and disinfection.

So, how does ultraviolet light kill bacteria and viruses? What are the characteristics of ultraviolet sterilization?

First, the principle of ultraviolet sterilization

There have been many articles on ultraviolet sterilization in recent years, and here are three points to reiterate:

1. Ultraviolet rays can be divided into UVA long-wave ultraviolet (wavelength range 315-400 nm), UVB medium-wave ultraviolet (wavelength range 280-315 nm), UVC short-wave ultraviolet (wavelength range 200-280 nm) and VUV vacuum ultraviolet (Wavelength range 10-200 nm). Among them, UVA long-wave ultraviolet is often called near ultraviolet, and UVC short-wave ultraviolet is often called deep ultraviolet.

2. Ultraviolet light is a mutagen. Under a specific wavelength range (mainly UVC) and a sufficiently high dose, ultraviolet light can cause abnormal chemical bonds between adjacent pyrimidine molecules of DNA or RNA in microbial cells such as bacteria and viruses , Hindering the replication of DNA or RNA, thereby causing microbial cell death. The deep ultraviolet LED achieves the effect of sterilization and disinfection by emitting deep ultraviolet rays of UVC wavelength.

3. Researchers at the Chinese Center for Disease Control and Prevention during the SARS period found that using deep ultraviolet light with an intensity greater than 90uW / cm2 to irradiate coronavirus for 60 minutes can kill the SARS virus. The new coronavirus is similar to the SARS virus and belongs to the single-stranded positive-strand RNA virus. Therefore, in theory, the scientific and rational use of ultraviolet light can effectively kill the new coronavirus.

Second, the advantages of ultraviolet LED

Currently, there are two kinds of ultraviolet light sources used for sterilization: traditional mercury lamps and deep ultraviolet LEDs. Compared with many shortcomings of traditional mercury lamps, deep ultraviolet LED has obvious policy advantages and technical advantages.

Disadvantages of traditional mercury lamps:

(1) Bulk appearance, large size, and equipped with high voltage electricity.

(2) It takes a long time to start up and cannot be used immediately after opening.

(3) Fragile, short service life, up to 90% of the service life is consumed in the frequent switching stage.

(4) Very toxic. After rupture, it will cause mercury leakage, pollute the environment and seriously endanger human health.

The policy advantages of deep ultraviolet LED: The United Nations Minamata Convention signed by 128 countries around the world has officially entered into force in China in August 2017. The treaty clearly states that countries will ban the production and import and export of various mercury-containing products from 2020. Traditional mercury The lamp will be prohibited from production and sale. The Chinese government has promulgated a series of policy documents such as "China's Strictly Restricted Toxic Chemicals List" and "Priority Control of Chemicals List (First Batch)", which set clear requirements for mercury control. As a traditional mercury manufacturing and mercury pollution country, the Chinese government actively implements the requirements of the Minamata Convention. In the long run, just as the replacement of traditional light sources by LEDs in the field of general lighting is an inevitable trend, deep green LEDs, which are green and environmentally friendly new ultraviolet solid-state light sources, will be an alternative to the traditional ultraviolet light source-mercury lamps. With the entry into force of the "Minamata Convention" and the continuous advancement of DUV LED's own technology, DUV LED will usher in the rapid growth of its industrial scale.

      The principle and advantages of deep UV LED sterilization

Technical advantages of deep ultraviolet LED: Among various sterilization and disinfection methods, only deep ultraviolet LED has energy saving, ready to use, space saving, maintenance-free, non-toxic and harmless, long life, no irritating odor, etc. Compared with other sterilization and disinfection methods, DUV LED has obvious technical advantages.

Beijing TORCH has developed an elevator deep ultraviolet sterilization and disinfection system, a deep ultraviolet sterilization and disinfection system for taxis, a deep ultraviolet central air conditioning and anti-virus module, a mask / mobile phone deep ultraviolet sterilization and disinfection treasure, and a deep ultraviolet sterilization and disinfection system. A series of products such as toilet lids, deep ultraviolet sterilization and disinfection medical garbage cans, subway deep ultraviolet sterilization and disinfection robots, vehicle-mounted anti-virus fans and other products have achieved staged success. In the recent launch experiments, they have obvious effects and can fully satisfy public transportation. , Public places, home protection and other scenarios. I believe that in the near future, such physical sterilization and disinfection instruments will replace chemical disinfectants with higher efficiency and better user experience to protect our health and safety! Everyone is welcome to discuss cooperation. Phone 0086-15901426460, email: s3@tonzh.com.cn