Method and device for manufacturing container made of biodegradable resin

A manufacturing method for manufacturing a biodegradable resin container, the manufacturing method comprising at least:

• an injection molding process of injection molding a preform made of a biodegradable resin in an injection molding mold;
• a temperature adjustment process of adjusting a temperature of the preform in a temperature adjustment mold;
• and
• a blow molding process of manufacturing the biodegradable resin container by blow molding the preform after temperature adjustment in a blow mold,
• wherein a temperature of the injection molding mold is set to 40° C. or lower,
• wherein, in the injection molding process, inner and outer skin layers of the preform are solidified until the inner and outer skin layers are opaque,
• wherein, in the temperature adjustment process, the inner and outer skin layers of the preform are heated until the inner and outer skin layers have transparency,
• wherein the biodegradable resin is a biodegradable plastic including, as a component, a material selected from the group consisting of polybutylene succinate, polyhdroxyalkanoate, polyhydroxybutyrate, polylacticacid, and polylactide,
• wherein, in the temperature adjustment process, a temperature of inner and outer skin layers of the preform is heated to a heating temperature which is a melting point of the biodegradable resin or within 15° C. below the melting point, wherein the temperature adjustment process includes:
• an inner heating process of heating at least a body portion of the preform from an inner side;
• and
• an outer heating process of heating at least the body portion of the preform from an outer side, and wherein a processing time of the outer heating process is longer than a processing time of the inner heating process.