The working principle of the ultraviolet sterilization furnace is based on the physical destruction of microbial genetic material by UVC ultraviolet rays (wavelength 200-280nm, core wavelength 253.7nm). When microorganisms (such as bacteria, viruses, spores, etc.) are exposed to this wavelength of ultraviolet light, the bases in their DNA or RNA molecules (such as thymine) absorb photon energy, causing adjacent pyrimidine bases to form dimers (such as thymine dimers). This structural distortion can block DNA replication and transcription processes, preventing microorganisms from synthesizing key proteins or completing genetic information transmission, ultimately leading to loss of reproductive ability or direct death.
The mechanism of microbial inactivation involves multiple levels of action:
Direct destruction of genetic material: 253.7nm ultraviolet photon energy (4.9eV/cell) can penetrate microbial cell membranes and directly act on base pairs in DNA strands, causing covalent bond breakage and interchain cross-linking, leading to genetic informational damage.
Interference with metabolic function: Free radicals induced by ultraviolet radiation can attack cell membrane lipids and enzyme proteins, disrupt the redox balance of microorganisms, and inhibit their energy metabolism and substance synthesis.
Collaborative ozone sterilization: In the air environment, ultraviolet radiation can ionize oxygen molecules to generate ozone (O3), which further enhances the inactivation effect by oxidizing the phospholipid layer of the cell membrane, forming a dual sterilization mechanism.
This technology has significant advantages:
Efficient and broad-spectrum: 30-60 minutes of irradiation can kill over 99.9% of common pathogenic microorganisms, including drug-resistant bacteria and bacteriophages.
No residual risk: No need to add chemical disinfectants, avoid secondary contamination, and meet the requirements of food safety and medical sterility.
Strong controllability: By adjusting the irradiation intensity (μ W/cm ²) and irradiation time, the degree of inactivation can be accurately controlled, suitable for multiple scenarios such as medical devices, food packaging, water treatment, etc.
In practical applications, the ultraviolet sterilization furnace adopts a track type transmission design, allowing the items to be disinfected to pass through the ultraviolet irradiation area at a uniform speed, ensuring even sterilization. Its sterilization efficiency has been certified by global public health institutions and has become a key equipment in modern epidemic prevention systems.