PURPOSE: To reliably and inexpensively mold foamed product with no defects in its external appearance and internal structure by a method wherein plural kinds of liquids raw waterials are poured into a mold cavity and then gas is introduced under pressure to expand and curefy, in an injection molding method causing a liquid reaction.
CONSTITUTION: A mixing head 8 provided with a gas supply port 16 and a gas exhaust port 17 is employed. With a piston 15 located on the right side, liquid raw materials A, B flow into the head through right pipes, pass through passages formed in the piston 15 and then discharged therefrom through left pipes, thus circulated separately. When working oil 12 is sucked to move the piston 15 leftward, the liquid raw materials A, B are mixed with each other. Subsequest movement of the piston 15 in the rightward direction causes a predetermined amount of the mixed liquid raw material to be fed into a mold cavity. Thereafter, a valve for the gas supply port 16 is opened to introduce gas 18 into the cavity, so that the mixed liquid raw materials are formed and solidified while filling up the cavity. Then, a valve for the gas exhaust port 17 is opened to discharge the excess of the gas 18, so that solidification is completed and foamed products are obtained.
ISOGAI TOKIO
KANEDA AIZOU
YOKONO ATARU
GOTOU MASAO
AOKI MASAYOSHI
TSUZUKI SUSUMU
KOUYA KENICHI
IIDA MAKOTO
NAKAMURA SHIYOUZOU
