The conventional production process is to mix polytetrafluoroethylene dispersion resin with liquid additives, make the mixture into thin sheets through calendering, and then use a machine to bidirectionally stretch the thin sheets to produce a microporous membrane.
The process flow is: PTFE resin, extrusion aid (material selection) – mixing – calendering – biaxial stretching – coiling.
?The film forming process of polytetrafluoroethylene microporous membrane manufacturers adopts a double stretching or stretching processing method.
PTFE can be stretched at room temperature to 327°C, that is, the stretching below the melting point is performed in a high elastic state.
Stretching at low temperatures will cause the film to break, making stretching impossible.
When it is higher than 327°C, the crystalline state between PTFE molecules changes to amorphous, and the network structure cannot be obtained well, so the general stretching temperature is between 40°C and 327°C.
In industries such as pharmaceuticals and electronic semiconductor production, there are higher cleanliness requirements for air. Semiconductor production requirements are that there should be no more than 1 particle per cubic foot of air, while in a normal environment, there are 500,000 particles per cubic foot of air. above particles.
Therefore, the workspace needs to be continuously circulated and cleaned with clean air filtered by HEPA filters.
The films produced by polytetrafluoroethylene microporous membrane manufacturers have excellent breathability, corrosion resistance, aging resistance, high temperature resistance and other properties.
According to the usage requirements, the pore diameter can be between 0.1-10um, the thickness can be between 2-100um, the porosity can reach 50%–80%, and there are up to hundreds of millions of micropores per square centimeter.
The product has high filtration efficiency and can meet the filtration efficiency level requirements of sub-high efficiency, high efficiency and ultra high efficiency air filters.
? is an environmentally friendly material polytetrafluoroethylene microporous membrane manufacturer that specializes in R&D, production and sales.
Our company is engaged in technology development, transfer, consulting, and services in the field of new materials; R&D, production, sales, and customization; and a provider of high-efficiency separation and filtration material design solutions.
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