[BULK] Wet PE single/double coating battery separator

The wet method is also called phase separation method or thermal phase separation method. It mixes high-boiling hydrocarbon liquid or low-molecular-weight substance with polyolefin resin, heats and melts the mixture and spreads the melt on a thin sheet, then cools down to separate the phases, and then orients the thin sheet longitudinally or biaxially, and finally extracts the liquid with a volatile solvent. Interpenetrating microporous membrane materials can be prepared, and the applicable materials are wide.
The diaphragm produced by the wet biaxial stretching method has higher longitudinal and transverse strength due to biaxial stretching. It is currently mainly used for single-layer PE diaphragms.