Dry/Wet Method Bi-axially Oriented Battery Separator Film Production Line
GLESI provides two methods of producing polyolefin separator film: dry method and wet method. Dry method has two subdivided techniques: single axial orientation and bi-axial orientation. Dry method single axial orientation technology first produces low crystalized, high oriented PP/PE film. After annealing, high crystallized and oriented film is achieved. Wet method is also called thermally induced phase separation. First mix high boiling point hydrocarbon liquid or low molecular mass material with polyolefin resins, heat the mixture and pour the melt on sheets, then lower the temperature to induce phase separation, then make orientation on the sheet in longitude direction or bi-axial direction, lastly use volatile solvent to extract the liquid.
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