Laminating blow molding method using shifting members

A laminating blow molding method for making a hollow article, comprising:

• extruding a parison from a path between a die head and a core;
• placing a resin sheet adjacent an outer surface of the extruded parison;
• sandwiching the parison with the resin sheet between a pair of mold pieces constituting a mold while heating the mold to a temperature exceeding softening temperatures of the resin sheet and the parison, the mold having a mold parting line when closed, one of the mold pieces having shifting members along the mold parting line;
• closing the mold so that the parison with the resin sheet is held inside the mold;
• moving the shifting members to the other of the mold pieces so that side portions of the parison and resin sheet are pinched and moved toward the other of the mold pieces to form and shift pinched portions;
• blowing the parison to blow mold the hollow article, the resin sheet being laminated to the hollow article;
• cooling the mold to a temperature to take out the hollow article;
• and
• taking out the hollow article.