Efforts have been made to make a thin composite resin-made container body to protect the environment and reduce costs. As an example, disclosed in Japanese Unexamined Patent Application No. 2000-313443 is a composite container that supplements rigidity of the container body reduced by being thinner, using a cylindrical paper label, in other words, a paper cylinder that covers the trunk of the container body.
Conventionally, this kind of composite container is made by forming the container body, then covering the container body with a separately made paper cylinder; it can take hours to combine the two so a limit has come to cost reductions.
However, as disclosed in Japanese Unexamined Patent Application Publication No. 2011-116082, it is common for this kind of container body to be made by moving a preform P in a lateral direction (horizontal direction) to a two-piece, split-mold blow molding die BM that opens and closes by rocking, and blow molding after closing the mold.