METHOD FOR PREVENTING LONG STRIP FILM FROM BEING BROKEN

PURPOSE:To prevent a film from being broken by inhibiting the adherence of edges of the film to each other, by applying an anti-sticking agent to both edges of a long strip, hygroscopic plastic film and then metallizing the surface of the film under vacuum while winding up it. CONSTITUTION:In metallizing a long strip film having a thickness of 4mum or below and composed of a hygroscopic plastic comprising unwinding the film wound into a roll and metallizing the surface of the film under vacuum while winding up it, an anti-sticking agent is previously applied to both edges of the long strip film. Since a thin film of 4mum or below in thickness is prepared from a hygroscopic film such as a polyester or a polycarbonate film, the edges of the film wound into a roll adhere to each other in some places so that when the roll is unwound from an unwinding roll, the edges are marred. Examples of the anti- sticking agents are silicone resin, fluororesin, stearate salt, wax, rosin ester, etc.