Three-layer and five-layer composite materials are a new type of filter material that is compounded with a layer of polytetrafluoroethylene film on the surface of ordinary filter materials.
This layer of film is equivalent to a “primary dust layer”. Material exchange is carried out on the surface of the membrane, and effective filtration can be carried out at the beginning of use.
The unique three-dimensional network structure of the film makes it impossible for dust to pass through, without the worry of pore clogging. This filtration method is called “surface filtration”.
The filter material made of composite materials can not only achieve zero emissions, but also because the film is non-sticky and has a small friction coefficient, the powder cake will automatically fall off, ensuring long-term stability of the equipment resistance, thus giving full play to the advantages of the bag dust collector. .
Compared with other polymers, PTFE three-layer and five-layer composite materials have their unique advantages, but they also have some defects, such as poor mechanical processing performance, large linear expansion coefficient, and creep resistance. Its application has been limited due to its poor properties, easy cold flow, poor wear resistance, and difficulty in molding and secondary processing.
At present, research on PTFE at home and abroad focuses on finding appropriate methods to modify it, improve its performance to a certain extent, and expand its application scope.
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