METAL-EVAPORATED AIR-PERMEABLE FILM MANUFACTURED FROM MOLTEN EMBOSSED POLYOLEFIN/FILLER PRECURSOR FILM AND MANUFACTURE THEREOF

摘要

PURPOSE: To form a metallized film having a large gas permeability by extrusion molding a precursor film from a polyolefin/filler mixture, and forming a mold of different film thicknesses by melt embossing the precursor film. CONSTITUTION: A precursor film is extrusion embossed from a mixture of a polyolefin and a filler, and then the film is melt embossed to emboss different films. Then, the melt embossed precursor films are stretched to give larger permeability to a thinner area as compared with a thicker area to manufacture a permeable film. Further, the stretched film is suitably heat set at a temperature higher then the stretching temperature and lower than a softening temperature.