| 摘要 |
PURPOSE:The titled film having a high metalizing strength and excellent laminatability with other substrates and being suitable as a food-packaging material, prepared by subjecting the surface of a polypropylene film having a specified density to a corona discharge treatment and then metalizing the treated film. CONSTITUTION:In forming a film by melting polypropylene or a propylene copolymer and extruding the melt through an extruder die, a polypropylene film, film density 0.895-0.902, or a propylene copolymer film, film density 0.891- 0.899, is prepared by, for example, a process including keeping the surface of the chill roll at 50-80 deg.C or a process including cooling by the use of cooling water of a temperature of 60-90 deg.C. Then the purpose metalized propylene film is prepared by subjecting the above-prepared film to a corona discharge treatment and then metalizing the treated film with a metal such as aluminum or chromium by, for example, vacuum deposition or sputtering. |
