| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for inspecting the pinhole of a blow-molded article which is suitable for an automatic blow molding process and can detect the pinhole exactly in a very short time by using hydrogen in a very small amount. SOLUTION: In the method, the article blow-molded with the use of a pressurized fluid containing hydrogen is sealed, and it is judged whether the article has the pinhole or not by detecting the hydrogen leaked outside when the sealed article is pressed from its outer surface. A cylindrical parison is extruded from an extruder by melting/kneading a synthetic resin. After the parison is blow-molded in a mold by using the hydrogen-containing pressurized fluid, the blow-molded article is taken out from the mold, and a pressurized fluid introduction hole in the blow molding is blockaded. The hydrogen leaked outside when the article with the hole blockaded is pressed from its outer surface is detected to judge whether the aricle has the pinhole or not. COPYRIGHT: (C)2007,JPO&INPIT |
