Injection molding method and injection molding apparatus

An injection molding apparatus comprising:

• an elongated cavity formed in a metal mold for an injection molding;
• a plurality of resin supplying ports arranged in a longitudinal direction of said cavity and provided for injecting a resin to the cavity;
• an injection portion provided so as to freely move along a direction of arrangement of said resin supplying ports;
• and
• an injection portion driving apparatus sequentially moving the injection portion to a position in correspondence to said resin supplying port.

An injection molding apparatus comprising:

• an elongated cavity formed in a metal mold for an injection molding;
• a plurality of resin supplying ports arranged in a longitudinal direction of said cavity and provided for injecting a resin to the cavity;
• an injection portion provided so as to freely move along a direction of arrangement of said resin supplying ports;
• and
• an injection portion driving apparatus sequentially moving the injection portion to a position in correspondence to said resin supplying port,
• wherein the molten resin is injected from each of the resin supplying ports while feeding a gas into the cavity so as to pressurize the cavity at a time of injecting the resin from each of the resin supplying ports, the gas pressurization is finished just before the resin is injected from the final resin supplying port, the resin is injected from the final resin supplying port, and the charging is finished.