There are two main production processes for polytetrafluoroethylene bubble-dot film: blow molding and casting.
The main production process flow is: the dehumidified and dried raw materials and calcium carbonate additives enter the extruder for plasticization – blowing (flowing) out the film – preheating – stretching – shaping – cooling – finished products.
Every aspect of this process is indispensable.
The main feature is to add inorganic fillers to the raw materials, and use the principle of forming micropores at the junction of the inorganic filler particles (1~10 microns) and the plastic film matrix being shaped during the stretching process. The size of these micropores is sub- At the nanoscale, hundreds of millions of micropores can be distributed in an area of 1cm2. These micropores constitute channels that allow gas to pass through, thereby achieving the breathable but impermeable properties of the film.
Polytetrafluoroethylene bubble point membrane has two categories: hydrophobic and hydrophilic: Hydrophobic: used for gas filtration to achieve sterility, large flux, high temperature resistance, strong acid and alkali resistance, and wide chemical applicability , suitable for fermentation tanks, carbon dioxide, nitrogen, compressed air.
When used for gas filtration, it can intercept 100% of various phages, bacteria and particles above 0.02um.
Hydrophilicity: used for liquid filtration to achieve sterility, wide chemical applicability, resistance to strong acids and alkali, and high ozone intensity.
</p
