MANUFACTURING METHOD OF BIAXIAL ORIENTATION PET FILM AND USAGE THEREOF FOR SMD-TECHNOLOGY FILM CAPACITOR

摘要

PURPOSE: A manufacturing method of a biaxial orientation PET film is provided to be particularly proper to manufacture a SMD-technology capacitor by being excellent in the contraction characteristic of a film. CONSTITUTION: The biaxial orientation PET film is manufactured by the steps of: extruding a polymer melting substance on a cooling roll; drawing the melting substance to the vertical and the horizontal direction; and releasing the substance by exceeding 0.1% to the vertical direction and 3% to the horizontal direction. And the raw material of polyester is used with a composition which includes more than 80% of selected polymer from a group consisting of polyethylene terephthalate(PET), polyethylene naphthalate(PEN), poly-1, 4-dicyclohexane dimethylene terephthalate(PCT), polyethylene naphthalate Bibenzoate(PENBB) and mixture of these polymers.