PURPOSE: To obtain a method for reaction injection molding which enables suppression of voids occurring in collision and mixing of a reaction stock solution in a mixing chamber.
CONSTITUTION: A method for reaction injection molding wherein an auxiliary injection solution is injected in a mixing chamber before a reaction stock solution is mixed in the mixing chamber, and then the reaction injection molding is executed. The auxiliary injection solution is preferably a liquid not producing an adverse effect on the reaction injection molding and a liquid being mixed easily with the reaction stock solution. Mold equipment 2 has the mixing chamber 12 for mixing at least two reaction stock solutions, mold tools 4 and 6 wherein a cavity 8 into which the mixture prepared by mixing in the mixing chamber 12 is injected is formed, and an auxiliary injection pipe 42 for injecting the auxiliary injection solution into the mixing chamber 12 before the reaction stock solution is sent into this mixing chamber 12.
NAKANO MUNETOSHI
YAMATO MOTOTOSHI
WADA YASUMASA
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