In order to better and more intuitively understand the filtration principle of PTFE air filter membrane-coated filter bags, we first understand the filtration principles of ordinary non-coated filter bags.
The filtration principle of ordinary non-coated filter bags is the depth filtration principle, which means that a layer of powder cake with gaps is first formed on the cross section of the filter material, so that this layer of powder cake can be relied on to achieve the purpose of filtering dust.
To put it simply, the filtration principle of non-coated filter bags is to use powder cake filtration instead of filter material.
The filtration principle of ptfe air filter membrane-coated filter bags is completely different from the depth filtration of ordinary non-coated filter bags. Its filtration principle belongs to surface filtration.
The filter medium is a PTFE microporous membrane with high efficiency interception capability. This PTFE microporous membrane is pressed on a special base material, and the selection of the base material should be consistent with the mechanical, temperature, and chemical requirements of the system. consistent.
The film is a chemically inert material.
The working temperature is 260 degrees Celsius, and the highest instantaneous temperature is 285 degrees Celsius.
The surface of this film is extremely smooth, difficult to adhere, and highly hydrophobic.
During operation, dust will not penetrate into the interior of the filter material, but will be collected on the surface of the membrane material, which is surface filtration.
This ensures that dust can be easily removed, even when humidity is high and the dew point is reached.
Therefore, throughout the service life, the filtration resistance of the PTFE air filter membrane-coated filter bag can always be maintained at a very low level, which provides conditions for high filtration wind speed.
Coupled with sophisticated filter bag design, special base materials and rich experience in bag manufacturing and dust collection system optimization, coated filter bags have a longer service life than ordinary filter bags.