MULTILAYERED BLOW MOLDING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a multilayered blow molding apparatus capable of conserving a raw material at the time of the replacement of a resin or a color and controlling the thickness of a multilayered parison. SOLUTION: A multilayered blow molding apparatus is equipped with a mandrel 19, a die upper part 1a having an inside sleeve 13 arranged so as to provide an inside annular passage 4 at the outside of the mandrel 19, and an outside sleeve 13 arranged so as to provide an outside annular passage 7 at the outside of the inside sleeve 13 and a die lower part 1b having a die 17 at its lower end part. The lower end of the inside sleeve 13 is positioned above the lower end of the outside sleeve 14 and the die lower part 1b is arranged in a slidable manner in the state being in contact with the outside surface of the outside sleeve 14 so as to regulate a gap 10 between the tip of the die 17 and a core pin 21.