| 摘要 |
PROBLEM TO BE SOLVED: To obtain a biaxially oriented polypropylene film which has stable surface tension and excellent flatness and is applicable to water base ink printing and a metallizing product such as vacuum plating which is required for high sticking strength and adhesive force to aluminum foil. SOLUTION: The printing surface or surface to be a plating surface of the coextruded biaxially oriented polypropylene film comprising three layers in which an antistatic agent and an antisticking agent are mixed in a polypropylene homopolymer is subjected to flame treatment by the combustion flame of liquefied natural gas containing at least 85% of methane under conditions of a polarization voltage of 0.1-0.8 kV, the optimum voltage of 0.2 kV, the temperature of a cooling roll of 20-50 deg.C, the optimum temperature of 25 deg.C, the temperature of flame of 700-900 deg.C, and the optimum temperature 760 deg.C.
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