METHOD FOR BLOW-MOLDING HOLLOW CONTAINER AND BLOW AIR CYLINDER

摘要

The blow air cylinder is constituted by a blow nozzle having a mechanism for positioning blowing inlets in at least part of a portion freely sliding forward and backward inside the body. The blow air cylinder has a tip portion with an outer diameter smaller than at about the center portion thereof and being of a shape of a closed injection needle, and having the blowing inlets located slightly at the back of the tip portion where the outer diameter is larger than that at the tip portion and smaller than that at the central portion and capable of introducing blow air downward in an amount of 30% or more of the total blow air amount; and a body provided outside and, at least partly, in contact with the blow nozzle.