| 摘要 |
PURPOSE:To improve the mechanical strength and crack resistance of a resin molded item, by injecting a material that is inferior in fluidity that has been obtained by adding an inorganic particulate filler and glass short fiber to a thermosetting casting material into a mold by a pressure cylinder followed by hardening. CONSTITUTION:A piston 3 is moved back behind an injection port 7, and a glass reinforced casting material is injected. Previously the mold 1 has been made vacuous with a valve 9 open, and has been heated. A valve 6 provided in an injection pipe 5 is opened, and the piston 3 is moved so that the glass reinforced casting material 4 may be injected into the vacuous and heated mold 1. In this case, the piston 3 is moved forward forcibly by pressure, the hardening is carried out with the valves 6, 9 closed before the mold 1 is filled with the casting material 4, and the cast item is removed after the hardening, so that the item becomes voidless, and as a result the item is excellent in electrical resistance and mechanical property and reliability. |
