| 摘要 |
PROBLEM TO BE SOLVED: To provide a perforated thermoplastic resin foam exhibiting high sound-absorbing performances, and its manufacturing method. SOLUTION: The perforated thermoplastic resin foam has a number of small holes that connect at least a part of the surface with the inside of the thermoplastic resin foam main body, where the small holes have at least a small hole upper part and a small hole lower part having a different inclination angle and the small hole upper part has an inclined shape with an enlarging diameter towards the surface. The manufacturing method of the perforated thermoplastic resin foam comprises obtaining the perforated thermoplastic resin foam by pressing at least a part of the surface of the thermoplastic resin foam main body with a V-shaped or gimlet-shaped pressing edge having a tip angle of 30-150°thereby to form a number of small holes having at least the small hole upper part and the small hole lower part having a different inclination angle, the small hole upper part having the inclined shape with an enlarging diameter towards the surface. COPYRIGHT: (C)2007,JPO&INPIT |
