Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1976-02-11
1977-11-29
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
229 25R, 264 464, 264 51, 264250, 264266, 264288, 264321, 264339, 264DIG73, 425403, B29D 2700
Patent
active
040605779
ABSTRACT:
Methods and apparatus are provided for producing seamless or apparently seamless plastic foam cups formed from both seamless and seamed sidewall blanks formed by stretching initially cylindrical blank into frusto-conical shapes and then molding such blanks with either expandable foamed plastic beads or foam plastic discs to form an integral cup bottom with the sidewall in an apparently seamless structure. If cylindrical containers are desired, or if frusto-conical sidewall blanks are utilized no stretching is required. Presizing of sidewall thickness prior to treatment in the mold is also provided.
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Anderson Philip
Maryland Cup Corporation
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