초록 ▼

This relates to an apparatus for injection molding preforms for beverage bottles wherein a minimum cycle time is involved. Cores over which thermoplastic material is injection molded to form preforms for use in the blow molding of bottles are provided in sets and carried by a rotary turret so that a

This relates to an apparatus for injection molding preforms for beverage bottles wherein a minimum cycle time is involved. Cores over which thermoplastic material is injection molded to form preforms for use in the blow molding of bottles are provided in sets and carried by a rotary turret so that as soon as the injection molded thermoplastic material has sufficiently set to permit its transfer with its associated core out of an injection mold cavity, the apparatus may be actuated to remove first injection molded preforms and thereafter immediately present a new set of cores to the injection mold cavities. This provides ample time for the cooling of the preforms so that when removed from the cores they will not be unduly deformed. In accordance with the feasible use of the apparatus, plural preforms, on the order of twenty-four and greater, may be formed with a cycle time on the order of 10-12 seconds.

대표청구항 ▼

A preform injection molding and treating apparatus comprising an injection mold having plural preform cavities arranged in rows and columns, an extruder coupled to said preform mold for simultaneously injecting plastic material into all of said preform cavities, a turret having a plurality of suppor

A preform injection molding and treating apparatus comprising an injection mold having plural preform cavities arranged in rows and columns, an extruder coupled to said preform mold for simultaneously injecting plastic material into all of said preform cavities, a turret having a plurality of support faces spaced equally about an axis, means mounting said turret for indexing about said axis, each of said support faces having projecting therefrom a plurality of cores equal in number to said preform cavities and arranged in rows and columns with the same spacing as said preform cavities, each of said cores being cooperable with a respective preform cavity to define a preform having a sprue tail, a conditioning mold angularly displaced from said injection mold about said turret, said conditioning mold having a plurality of conditioning cavities equal in number to said preform cavities and arranged in rows and columns with the same spacing as said preform cavities, each of said conditioning cavities being of a greater size than said preform cavities to provide a space around a preform positioned therein for the circulation of a conditioning fluid, sprue tail removal means associated with each conditioning cavity, each conditioning cavity having an exhaust port for the removal of conditioning fluid and a removed sprue tail; means for effecting relative movement between said injection mold, said turret and said conditioning mold to effect the selective opening and closing of said preform cavities and said conditioning cavities; and means for rotating said turret to sequentially present said cores to said preform cavities and then to said conditioning cavities.