When materials are sent out of the clean area, they should first be transported to the relevant material intermediate station and then moved out of the clean area in the opposite order of the materials entering. When the materials enter, the raw and auxiliary materials are unpacked or cleaned by the personnel organized by the process leader of the preparation team, and then sent to the temporary storage room of raw and auxiliary materials in the workshop through the transfer window; the inner packaging materials are unpacked in the outer temporary storage room and sent to the inner packaging room through the transfer window. The workshop general staff and the person in charge of the preparation and inner packaging process handle the material handover.
1. Forms of pass box
(1) Mechanical. The mechanical transfer window has two inner and outer window sashes, which are mechanically interlocked. When one window sash is opened, the other window sash is locked and cannot be opened. At this time, the object to be transferred is placed in the middle of the window body, and the open window sash is closed. At this time, the self-locking switch of the window sash on the other side is released, and it can be opened and the object can be taken out.
(2) Airlock. Compared with the mechanical type, the airlock transfer window has clean air flowing between the windows. This type of transfer window is equipped with a fan and a high-efficiency air filter. Before opening the window, the fan must be started to circulate the clean air flow to avoid indoor air contamination.
(3) Sterilization type. For biological clean rooms, the objects being transferred may carry a lot of microorganisms and pathogens, so an ultraviolet lamp is installed in the transfer window. The ultraviolet lamp is turned on automatically. When transferring materials, open the transfer window and put the materials into the window. After closing the transfer window, the ultraviolet lamp automatically turns on for sterilization after a delay. After irradiation for several minutes, the ultraviolet lamp automatically turns off. After a certain period of time, the other side of the transfer window can be opened.
(4) Liquid passing type. It is just an isolated transfer window. It consists of a box with openable and closable ends. There is a partition from top to bottom in the box, and there is a certain distance between the partition and the bottom. The box is filled with a liquid medicine with sterilization and disinfection. When transferring items, put the items into a closed box, open the cover on one side of the transfer window, put the item box into the liquid medicine, and then close the cover. Then open the cover from the other side to take out the item box. This kind of transfer window is also called a closed removable transfer window.
(5) Rotating transfer window. The rotating transfer window adopts a circular sleeve type, with a window sash that can be opened and closed on each of the two cylinders. When the window sash on one sleeve of the transfer window is in a closed state, the window sash on the other sleeve can be opened, that is, only one of the window sashes on the two sleeves can be opened at all times, thereby preventing outdoor air containing dust and germs from entering the clean room.
2. Matters to be noted in the installation of pass box
Whether it is a clean room with a civil structure or a wall panel structure, the gap between the transfer window and the clean room enclosure structure must be handled well and there must be no air leakage. The light leakage method can be used for inspection during installation, and the tightness of the joint must be ensured.
Installation method of the transfer window:
Choose a convenient location on the wall, and then make a hole. The hole is generally about 10MM larger than the outer diameter of the transfer window. Put the transfer window into the wall, generally install it in the middle of the wall, keep it balanced and fixed, use rounded corners or other decorative strips to decorate the gap between the transfer window and the wall, and seal it with glue.
Workflow matters of the transfer window:
1. When materials enter and exit the clean area, they must be strictly separated from the flow of people and enter and exit through the special channel for materials in the production workshop.
2. When the materials enter, the raw and auxiliary materials are unpacked or cleaned by the person in charge of the preparation class process, and then sent to the temporary storage room for raw and auxiliary materials in the workshop through the transfer window; the inner packaging materials are removed from the outer packaging in the outer temporary storage room and sent to the inner packaging room through the transfer window. The workshop general staff and the person in charge of the preparation and inner packaging process handle the material handover.
3. When passing through the transfer window, the "one open and one closed" regulations of the inner and outer doors of the transfer window must be strictly implemented, and the two doors cannot be opened at the same time. Open the outer door to put the material in and close the door first, then open the inner door to take the material out, close the door, and so on.
4. When materials in the clean area are sent out, they should be transported to the relevant material intermediate station first, and then moved out of the clean area in the opposite procedure of the materials entering.
5. All semi-finished products shipped out of the clean area must be sent from the transfer window to the external temporary storage room, and then transferred to the outer packaging room through the logistics channel.
6. Materials and waste that are extremely easy to cause pollution should be transported to the non-clean area from their dedicated pass box .
7. After the materials are in and out, the site and pass box of each clean room or intermediate station should be cleaned in time, the internal and external passage doors of the transfer window should be closed, and cleaning and disinfection should be done.
