Compared with ordinary workshops, dust-free clean rooms are characterized by dust-free, high cleanliness and non-existence of any pollutants. It is understood that dust-free clean room can be achieved by physical and static methods, which specific purification methods will be involved?
There are two main physical purification methods for clean rooms. One is adsorption filtration, which uses porous carbon materials such as activated carbon to effectively absorb impurities in the environment, so as to achieve dust-free proximity. Activated carbon is a highly developed pore structure, which can fully contact with gas, making it very easy to absorb and collect impurities.
Another is mechanical filtration, which is also a cleaning method for clean rooms. It needs to be equipped with high efficiency air filters and filters that meet the HEPA standard.The filter consists of a stack of subglassy fibre membranes that fold back and forth continuously, allowing air to pass through, but small particles cannot pass through.
In addition, electrostatic purification is also one of the dust removal methods of clean room, but its effect is less than mechanical filtration. Because it adopts the principle of high-voltage electrostatic adsorption dust removal, the cathode line in the electrostatic field under the action of high-voltage electrostatic makes a large number of negative ions in the corona layer, and the negative ions continuously move towards the anode under the action of the electrostatic field.
When dust passes through the electric field in the air, it is charged by the collision zone of negative ions. The charged dust also moves to the anode by the action of the electrostatic field, and releases the charge when it reaches the anode. In this case, it is easy to make ozone in clean room.
Of course, we can also use the negative ion method as a clean room purification method. When the Hydroxyl Anion contacts with harmful gas floating in the air, it can reduce the active oxygen from the atmosphere, thereby reducing the harm caused by excessive reactive oxygen species. At the same time, the dust in the dust-free clean room is neutralized and charged, and then settles without charge.