Injection molding mold, injection stretch blow molding machine, and method for producing hollow molded body

An injection stretch blow molding machine comprising:

• an injection molding section with an injection molding mold for injection molding a preform, and
• a blow molding section for stretching and blow molding the injection molded preform to mold a hollow molded body, wherein
• the injection molding mold of the injection molding section includes an injection core mold and an injection cavity mold, and is configured to mold a preform with a preform bottom portion with a wall thickness thinner than a preform body portion,
• the injection core mold has an outer surface of a tip portion thereof corresponding to a preform bottom portion and a lower end portion of a preform body portion where the preform bottom portion continues to the preform body portion,
• the outer surface corresponding to the preform bottom portion and the lower end portion of the preform body portion is a mirror-finished surface, and
• the outer surface of the injection core mold for forming the preform other than the mirror-finished surface is a roughened surface.

A method for producing a hollow molded body, comprising:

• an injection molding step of injection molding a preform;
• and
• a blow molding step of stretching a preform obtained in the injection molding process while blowing a gas into the preform for blow molding to mold a hollow molded body, wherein
• the injection molding step is to injection mold a preform with an injection molding mold including an injection core mold and an injection cavity mold, the preform having a preform bottom portion with a wall thickness thinner than a preform body portion,
• the injection core mold has an outer surface of a tip portion thereof corresponding to a preform bottom portion and a lower end portion of a preform body portion where the preform bottom portion continues to the preform body portion,
• the outer surface corresponding to the preform bottom portion and the lower end portion of the preform body portion is a mirror-finished surface, and
• the outer surface of the injection core mold for forming the preform other than the mirror-finished surface is a roughened surface.