| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection molding method capable of efficiently molding molded articles stable in weight, dimension and shape using a mold having a plurality of cavities different in shape or size. SOLUTION: Resin gate valves and resin pressure sensors for detecting the pressure of the resin charged in cavities are provided in the resin passages to the respective cavities of a mold to be used. At first, the resin gate valve 13A of the first cavity 11A is opened to fill the cavity 11A with the resin and the resin pressure signal detected by the resin pressure sensor 16A is subjected to feedback control so as to follow an in-mold pressure set pattern to adjust the oil pressure of the hydraulic cylinder 1c of an injection unit and, after the dwelling of the resin pressure in the cavity 11A is completed, the resin gate valve 13A is closed. Hereinbelow, the same process is repeated with respect to other cavity to perform injection molding in all of the cavities.
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