| 摘要 |
<p>PURPOSE:To reduce mandays and a transportation cost by inserting a cylindrical soft metal body in internal contact with a parison, then compressing the parison by metal molds to form a hollow panel, further injecting hard urethane powder of the specified grain size into the panel, and evacuating the inside of the panel. CONSTITUTION:PPO resin stored in an accumulator 5 is extruded from a die 6 by an extrusion molding machine to form a cylindrical parison 7. At this time, a cylindrical aluminum film 8 to be attached to the inside of the parison 7 is set in the die 6, so that the film 8 comes in internal contact with the parison 7 simultaneously with the extruding action. The parison 7 is then clamped from the right-angled direction by metal molds 9, 10 so as to form a hollow panel 2. Pearlite powder of the specified grain size is further filled into the hollow panel 2 through a pipe 11 in order to secure strength as structural material, and then the inside of the hollow panel 2 is made into the vacuum state by a vacuum pump.</p> |
