Package Machinery Co. Inc.

Hercules Corporation

Bernie A Olmsted

Donald F Armour

An injection-blow molding machine is provided with non-splitting injection and blow molds mounted in stationary relationship on a first platen with the axes of the molds parallel with each other and with a spindle situated equidistant from the molds. Parison pins which cooperate with the two molds are mounted on a second movable platen connected to the end of the spindle and are inserted and withdrawn from the molds as the spindle and the second platen are reciprocated toward and away from the molds. The second platen is also rotatable about the spindle axis to permit the parison pins to be indexed between the injection and blow molds so that parisons can be formed in the injection mold and transferred to the blow mold where a final article such as a container is formed. Neckring segments are mounted on the second platen in cooperative relationship with the parison pins to form the neck portion of a container, and the neckring segments include projecting portions which mate with annular grooves around the mouth of the blow mold to define a shoulder of the blown container between the mouth of the non-splitting mold and the neck of the container.

Injection-blow molding machine having non-splitting injection and blow

The charge forming barrel has a screw slidably and rotatably received therein, and the screw is specially suited for successively forming a mottle charge, a valve stud being mounted on the forward end of the screw, and this stud cooperating with a ring shaped non-return valve to close off rearward flow of the plasticized ingredients comprising the charge. The valve closes in a sliding or shearing action which avoids the propensity for such pellets to prevent the full closure of the non-return valve during the period of the cycle where a charge is injected into the mold cavities, and prior to forming of the next succeeding charge.

Non-return valve for mottle charge in plastic injection molding machine

A rotating feed screw in the barrel of an injection molding machine is fitted with a collar with peripheral grooves through which the plasticized material is fed into a charge forming chamber. The collar is held onto the end of the feed screw by an elongated torpedo body, which body has a first portion for receiving the annular collar, a second portion which defines a plurality of helically oriented crisscrossing grooves in its cylindrical surface, and a third axial portion which defines a raceway for a plurality of spherical roller elements. A nonreturn valve in the form of an annular shuttle is slidably received on the second axial portion, and also slidably received in the bore which rotatably receives the screw, so that the plasticized material is required to pass through the above mentioned grooves and around the ball elements. Thus, the ingredients are mixed in several stages prior to being injected through a nozzle provided in the head of the barrel, into the mold cavity.

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East Longmeadow, MA, United States of America

Bernie A Olmsted