Injection blow molding method

Abstract

Abstract An injection blow molding method utilizing a rotary indexing plate on which core rod assemblies are mounted for indexing, in a rotary path, through at least three stations. The first station is an injection station at which a plastic parisian or preform is injected around the core rod and within a neck mold. The second station is a blow station at which air passes through the core rod into the parisian thereby inflating it and forcing it against the surface of the selected blow mold cavity. The third station is an ejection station at which the finished plastic container is removed from the core rod and neck mold. In some applications there are four stations. The fourth stations could be used to preheat or precool the core rods preparing them for the start of the ejection cycle. The fourth station in a suggested embodiment could be deployed for preparing for orientation the plastic parisian by temperature control; and, thereafter, orientation takes place prior to blowing. obviously the tree and four station machine can be modulated to present a six and eight station machine respectively. In one embodiment, the core rods and supporting indexing plate are vertically reciprocal into and out of the injection mold, blow mold and removal mechanism. In another embodiment, the core rod assemblies do not reciprocate but the associated injection and blow molds and finished product removal mechanism are mounted for vertical reciprocation on a clamp plate. The blown finished containers are indexed to the ejection station at which the containers are removed from the machine. In the event the neck mold is one-piece construction and the container neck includes threads, an unscrewing device acts to remove the bottle from the mold. If a neck mold of multiple section construction is utilized, the neck mold is opened by suitable mechanical means.

Inventors

• 👤 P Marcus

Bibliographic Details