Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Starting material is nonhollow planar finite length preform...
Patent
1987-09-28
1989-03-07
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Starting material is nonhollow planar finite length preform...
264322, 264553, B29C 4922, B29C 4920, B29C 5114, B29C 5112
Patent
active
048104574
ABSTRACT:
A process is disclosed for thermoforming a sheet or billet comprised of at least one outer layer of polypropylene and at least one adjacent layer of a random copolymer of propylene and ethylene and, optionally, a barrier layer. The sheet or billet is thermoformed into rigid articles which do not significantly distort under retort conditions by forming the sheet or billet at a temperature below the sticky point of the polypropylene layer and above the sheet distortion temperature.
REFERENCES:
patent: 3719735 (1973-03-01), Valyi
patent: 4234536 (1980-11-01), Thiel et al.
patent: 4424182 (1984-01-01), Cerny
Anderson Philip
Haas Donald F.
Rampart Packaging Inc.
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