Basic knowledge in clean room applications

Basic knowledge in clean room applications

Clean room knowledge

Content Guide: Repair Room: Placement of auxiliary and support equipment (in addition to loading and unloading equipment ) . Maintenance of this area is very important for production cleanliness levels.
â— Clean room performance:
Traditional clean room:
class100Kâ€”The air exchange rate is less than 20/ hour.
class10Kâ€”The air exchange rate is less than 20 to 60/ hour.
class1Kâ€”The air exchange rate is less than 60 to 150/ hour.
Laminar flow chamber:
Class100 , 10,1---The air exchange rate is between 200 and 600/ hour. 80% to 100% of the roof is covered by the filter.
Micro-environment: can reach class1 .
â— Clean room operation:
1) Adhesive floor material: Usually in the clean room entrance to the dressing area and clean room, the viscous material is used to remove dust particles from the sole.
2) Dressing area: The buffer zone of the clean room and the external environment. The management of this area directly affects the cleanliness of the clean room.
3) Air pressure: Maintaining and monitoring positive air pressure relative to the external environment or related areas will directly affect the operation of the clean room.
4) Wind bath: In theory, the changed clothes should be further " scrubbed " before entering the clean room.
5) Maintenance room: placement of auxiliary and support equipment (in addition to loading and unloading equipment ) , maintenance of this area is very important for the level of cleanliness of production.
6) Double door passage: airtight inlet and outlet that allows raw materials or products to enter and exit the clean room.
7) Changing procedures: In the case of clean room clothing, storage, dressing and changing play a key role in the operation of the clean room. Clean room maintenance ( including laundry ) is often overlooked during clean room operations.
â— Pollution caused by staff:
1) Skin: Humans usually complete a complete skin exchange every 4 days. Humans shed about 1000 skins per minute ( average size is 30Ã—60Ã—3um) .
2) Hair: Human hair ( about 50 to 100 um in diameter ) has been falling off.
3) saliva: including sodium, enzymes, salt, potassium, chloride and food particles.
4) Daily clothing: particles, fiber, silica, cellulose, various chemicals and bacteria.
5) Humans will produce 10,000 particles larger than 0.3um per minute when they are still and sitting.
6) Humans will produce 1,000,000 particles larger than 0.3um per minute when the head and torso are moving.
7) at a speed of human 0.92mph (0.9m / s) will result in walking 0.3um greater than 5,000,000 particles per minute.
â— Clean outdoor clothing use strategy:
Zui miniaturization: hair nets, masks, gloves, and tooling are often seen as a process of establishing a clean environment.
In case of greater than class100 : increase the hood and shoe cover.
In the case of class 100 and 10 : clean clothing.
In class1 or cleaner: completely cleansing.
At present, although the countries in the world have their own specifications, they generally adopt the US federal standard 209 .

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