Blow molding method, composite preform, composite container, inner label member, and plastic member

A blow molding method for molding a composite container, the composite container comprising:

• a container body made of a plastic material and having a shoulder part, a trunk part, and a bottom part, the bottom part including a central concave part and a grounding part surrounding the concave part;
• and
• a plastic member disposed on an outer surface of the container body, the blow molding method comprising:
• preparing a preform which is made of plastic material;
• arranging a plastic member comprising a heat contracting tube outside the preform and setting the plastic member in close contact with an outer surface of the preform by heating the plastic member at 50 C to 100 C to cause heat shrinkage;
• heating the preform and the plastic member, and inserting the preform and the plastic member in a blow molding die;
• integrally inflating the preform and the plastic member by performing blow molding on the preform and the plastic member in the blow molding die;
• and
• attaching the plastic member to the preform without using an adhesive such that the plastic member contacts the preform and does not move or rotate with respect to the preform, the plastic member covering the shoulder part of the container body, the trunk part of the container body, and at least the grounding part of the bottom part of the container body.