In the PTFE bubble film forming process, the double stretching or stretching processing method is mostly used abroad.
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.
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The key to the technology is the optimized combination of speed ratio, pressure ratio, operating temperature and other parameters. According to the ratio and pore-forming medium, the air permeability, thickness and void ratio can be adjusted online to meet your different requirements. .
PTFE bubble point membrane has 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.
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, it also has good filterability for special gases with high temperature, high humidity, high corrosion and organic liquids.
So PTFE bubble film is widely used in medical, electronics, precision machinery and other industries.
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