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The core principles of the VHP pass box
The core principles of the VHP pass box(1) The magic transformation of hydrogen peroxideThe core of sterilizing the VHP pass box lies in using hydrogen peroxide. Hydrogen peroxide, the chemical formula H₂O₂ substance, at room temperature is a colorless transparent liquid, with strong oxidation. In the VHP pass box, hydrogen peroxide does not work as an ordinary liquid but undergoes a magical transformation. The hydrogen peroxide liquid is quickly converted to gas by high-temperature flash technology. Imagine that the liquid is heated in an instant, and quickly converted into steam, this transformation is not only a change of state but also brings a powerful sterilization ability. In the gas state, hydrogen peroxide can be more evenly diffused to every corner of the transfer window, in full contact with the surface of the sterilized item. This is because the gas molecules have stronger mobility and diffusivity, and can penetrate the fine gaps and convex surfaces of the goods, to achieve comprehensive sterilization coverage. Compared with the liquid state, gaseous hydrogen peroxide has a stronger spore-killing ability. When hydrogen peroxide gas comes into contact with microbial spores, free hydroxyl groups (· OH) are formed. These hydroxyl groups are like tiny but powerful "disruptors", which are extremely active and can quickly attack cellular components, including lipids, proteins, and DNA tissue. They destroy the structure of the cell membrane, leaving the cell without a protective barrier; It will also attack proteins and DNA, and interfere with the normal metabolism of cells and the transmission of genetic information, to achieve the purpose of killing microbial spores. (2) Full analysis of sterilization process Rapid introduction, concentration spike: When the item to be sterilized is placed in the VHP transfer window, the vaporization unit begins to work rapidly. It acts as a powerful "gas ejector" that delivers hydrogen peroxide gas at a faster rate into the inner cavity of the pass box. The purpose of this process is to rapidly increase the concentration of hydrogen peroxide gas in the cavity of the transfer window in a short period. It is like the rapid release of a large amount of disinfectant in a closed room so that the concentration of disinfectant in the entire space quickly rises to a higher level. At this stage, the high concentration of hydrogen peroxide gas can quickly attack the microorganisms on the surface of the item, laying the foundation for subsequent thorough sterilization. Low-speed maintenance, continuous sterilization: When the concentration of hydrogen peroxide gas reaches a certain level, the vaporization unit will switch to the low-speed import mode. At this time, its role is to maintain the concentration of hydrogen peroxide gas required for the disinfection and sterilization of the cavity of the pass box. Because hydrogen peroxide is constantly consumed during the sterilization process by reacting with microorganisms, it is necessary to continuously replenish the gas to maintain an effective sterilization concentration. It's like adding fuel to a burning stove to keep the fire steady. At this stage, low-speed hydrogen peroxide gas continues to carry out biological decontamination treatment on the external surface of the material, ensuring that microorganisms in every corner can be completely killed. In this process, hydrogen peroxide gas continues to exert its strong oxidation, constantly destroying the structure and function of microorganisms, so that they cannot survive and reproduce. Ventilation and residual, safe finishing: After the disinfection and sterilization treatment is completed, the hydrogen peroxide gas in the pass box needs to be treated to ensure the safety of subsequent use. At this point, the ventilation system begins to work, which exhausts the hydrogen peroxide gas inside the pass box until the hydrogen peroxide gas concentration is less than 1ppm. This is because although hydrogen peroxide has a strong sterilization ability if the residual concentration is too high, it may cause potential harm to people and items in subsequent contact with the pass box. Reducing the hydrogen peroxide gas concentration to less than 1ppm will ensure the safety of the environment in the pass box and will not adversely affect human health and the quality of goods. The discharged hydrogen peroxide gas will gradually decompose into water and oxygen in the environment, which will not cause environmental pollution, which is also the embodiment of the environmental protection of the VHP pass box. |
