Blow pin construction in a plastic bottle blow molding machine

摘要

A plastic bottle is formed by extruding a hot plastic parison around a blow pin within a two-part mold. The mold is closed and sealed and the parison is expanded by air pressure against the cooled internal wall of the mold. Each mold half at its top neck carries a sealing assembly which seals against the blow pin. The blow pin is cooled by the air pressure and has an elongated lower tubular portion with air holes which are slanted upwardly to form a selected blow air pattern to aid in forming the handle portion of the bottle.