Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Patent
1996-10-07
1998-05-12
Timm, Catherine
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
264516, 264534, 425503, 425525, B29C 4904, B29C 4920
Patent
active
057500673
ABSTRACT:
A method and apparatus for blow molding articles having a circumferential sidewall terminating in a closed top in which at least one preformed solid hoop is partially fused to the circumferential wall of the article and projecting axially above at least a portion of said top end. The entire outer peripheral edge portion of each reinforcing hoop is concentrically placed underneath the extrusion head with a suitable fitting. Thereafter, a tube of soft thermoplastic material is extruded through the totally open central portion of the hoops until the end of the tube overlies the pneumatic nozzles. Each mold half consists of a center sections and intermediate sections that are relatively movable in a direction lengthwise of the mold to enable both engaging the hoops and loosening the blow molded article of the mold. End mold sections slide on an incline to fully close the mold. The semi-cylindrical mold central halves close to radially position the hoops and form a cylindrical mold. The intermediate mold sections move in a tandem slide toward the central mold halves to engage the hoops. The mold end sections fully close the mold and thereafter the thermoplastic tube is blown against the walls of the mold and the reinforcing hoops and fitting therefor to form the container with reinforcing hoops bonded to top and bottom of the container. Reverse mold opening sequence allows article demolding. The so made resulting article has chimes extended axially beyond the end of the article and deeply recessed top and bottom.
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