What is the working principle of the clean pass box?

The clean pass box is a device used for transferring items between clean rooms and non-clean rooms or between clean rooms of different grades. It can effectively prevent cross-contamination and ensure the cleanliness of the clean room. Its common application scenarios are as follows:
Pharmaceutical production
Sterile drug production workshop: When producing sterile drugs such as injections and powder injections, raw materials, packaging materials, etc. need to enter the sterile production area through clean pass boxes to prevent external contaminants from entering and ensure the quality and safety of drugs.
Laboratory: When conducting experiments such as drug research and development and quality inspection, the clean pass box can transfer experimental equipment, reagents, and other items to prevent the experimental process from being disturbed and contaminated by the external environment.
Food processing
High-cleanliness food production workshops: Such as workshops that produce ready-to-eat foods like pastries, candies, and dairy products. The clean pass box can be used to transfer raw materials, packaging materials, production tools, etc., to ensure that the food is not contaminated by the outside world during the processing.
Food packaging workshop: Transfer packaged food to prevent contamination by dust, microorganisms, etc. during the transfer process, ensuring the hygiene and safety of the food.
Electronic manufacturing
Integrated circuit production workshop: Chip manufacturing and other industries have extremely high environmental requirements. Clean pass boxes are used to transfer raw materials such as silicon wafers and photoresists, as well as components of production equipment, to prevent tiny particle contaminants from affecting the performance and quality of chips.
Liquid crystal display panel production workshop: During the production of liquid crystal panels, clean transfer Windows can be used to transfer materials such as glass substrates and polarizers, ensuring the cleanliness of the production environment and preventing impurities from causing defects in the panels.
Precision instrument manufacturing
Optical instrument manufacturing workshop: When manufacturing optical instruments such as microscopes and telescopes, the clean pass box can be used to transfer components such as optical lenses and tubes, preventing contaminants like dust and hair from adhering to the optical elements and affecting the imaging quality and accuracy of the instruments.
Aerospace precision parts processing workshop: When processing precision parts such as aero engine blades and aircraft landing gears, the clean pass box is used to transfer raw materials and processing tools to ensure that the parts are not contaminated during the processing and meet the strict requirements of the aerospace field for the accuracy and quality of parts.
Medical and healthcare
Operating room: The clean pass box can be used to transfer surgical instruments, dressings, and other items, ensuring a clean environment in the operating room and reducing the risk of surgical infection.
Ward: For some special wards, such as isolation and burn wards, clean transfer Windows can be used to transfer medicines, food, daily necessities, etc., preventing external bacteria and viruses from entering the ward and protecting patients from infection.