Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1991-11-15
1993-04-13
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Including application of internal fluid pressure to hollow...
264534, 425525, B29C 4900
Patent
active
052020789
ABSTRACT:
An apparatus for producing blow-molded containers having thickened flanges. The apparatus utilizes major mold halves and a plurality of minor mold elements disposed within the mold halves to form containers having thickened flanges. The minor mold elements move radially relative to the mold halves and the joined pair of containers. While the blow-molded material is still moldable, the minor mold elements move radially inward to fold and bond the material onto itself, forming a pair of thickened radial flanges on each container. The flanges are each substantially twice as thick as a single layer of blow-molded material. Longitudinally-oriented reinforcing ribs are formed at the interstices of the minor mold elements which link the two thickened flanges and further strength the containers. By allowing the mold halves to remain substantially still during the blow-molding process, the tab of material formed at the junction of the mold halves opposite to the feed end of the blow-molding chamber is preserved, thereby facilitating post-processing handling of the containers. The minor mold elements may be oriented at different angles relative to the mold chamber to produce two flanges of differing configurations on each container.
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Lerio Corporation
Silbaugh Jan H.
Timm Catherine
LandOfFree
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