Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With product ejector
Patent
1981-04-24
1986-12-30
Pavelko, Thomas P.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With product ejector
425437, 425577, B29F 114
Patent
active
046326570
ABSTRACT:
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 injected 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 surrounding 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 between the core and the surrounding soft molded plastic to act as a bearing or lubricant to enable the core to be completely withdrawn from the cavity without damaging the molded container.
REFERENCES:
patent: 3183292 (1965-05-01), Dvoracek
patent: 4128381 (1978-12-01), Bonis
LandOfFree
Apparatus and method for injection molding of elongated hollow p does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for injection molding of elongated hollow p, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for injection molding of elongated hollow p will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1544985