The production method of polytetrafluoroethylene microporous membrane is to fully mix dry PTFE fine powder with additives, then enter the extruder, and the powder is pushed to squeeze out strips of PTFE, as shown in Figure 1, and then It is rolled into a film sheet under a rolling machine. After heating to evaporate the additives, it can be stretched longitudinally and transversely, and then through heat treatment, shaping, cutting and rolling to obtain a biaxially stretched microfiltration membrane. This film is laminated on various materials using a special process. On fabrics and substrates, it can become a new type of filter material. The membrane has small pore size, uniform distribution, and large porosity. While maintaining air circulation, it can filter all dust particles including bacteria to achieve the purpose of purification and ventilation.
</p
