| 摘要 |
PURPOSE:To enable the continuous piercing of uniform micro through-holes and high moisture permeability and adequate water permeability to be provided in film by enlongating film added with a filler to generate rupture holes and applying a discharge process to film. CONSTITUTION:Synthetic resin added with 20-200wt% of inorganic and/or organic fillers is extruded into film 3 through a molding die 2 provided at the tip of an extruding machine 1. Then it is properly preheated by a preheating roller 4, 5 according to necessity, and elongated more than 1.05 times in a vertical direction by a pinch roller 6, 7 to generate micro rupture holes in film 3. Later, the film 3 is conducted into between a pair of electrodes 8, 9 applied with high voltage transmitted from a high tension generator 10 for discharge processing. As a result, through holes of uniform size are pierced. Thus film having high moisture permeability and adequate water permeability is obtained by the involved effects of rupture holes due to the elongation and through-holes to discharge processing. |
