B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/680
B29C 45/43 (2006.01) B29C 45/26 (2006.01)
Patent
CA 1164175
? APPARATUS AND METHOD FOR INJECTION MOLDING OF ELONGATED HOLLOW PLASTIC CONTAINER WALLS ABSTRACT OF THE DISCLOSURE Straight walled hollow containers may be molded without taper, according to the present invention. Two mold halves, when brought together define a cavity configured to the outer wall of a hollow plastic container to be-injection molded, and also an opening at one end of the cavity to enclose the stem of a core defining the inner wall of the hollow plastic container. When the core is disposed in the cavity, it is centered within the latter. Thereby a space is provided between the inner walls of the mold halves and the outer wall of the core to receive plastic material in- jected under high pressure through a sprue, also defined by the-inner walls of the mold halves. After injection, the plastic is cooled to just below the softening point of the plastic. At this point separation of the mold halves sur- rounding the outer portion of the core, is commenced and a force is applied to initiate withdrawal of the core from between the mold halves. Simultaneously therewith, air under pressure is injected into the space between the innermost end of the core within the cavity and the adjacent end of the cavity. Thereby, the air under pressure is forced be- tween the core and the surrounding soft molded plastic to act as a bearing or lubricant to enable the core to be com- pletely withdrawn from the cavity without damaging the molded container.
355039
Fetherstonhaugh & Co.
Potoczky Joseph B.
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