Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1980-11-24
1982-10-05
Hall, James R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 51, 264 54, 264119, 264120, 264126, 264122, B29D 900
Patent
active
043527663
ABSTRACT:
A scrap-free, substantially solid phase, relatively low temperature economical process for rapidly making plastic articles from resinous powders wherein the resultant articles can comprise various polymers including oriented polymers; polymers with a high practical heat distortion temperature; expanded polymers; ultra high molecular weight polymers; blended structures of two or more materials; or multilayered structures. The resinous powders are initially compressed into briquettes, which briquettes are heated to a temperature in the range from about the alpha transition temperature to less than the melting point or melt temperature of the polymer therein to both somewhat soften and sinter the briquettes. The sintered briquettes are forged under conditions which permit substantial plug flow deformation into preforms whereby fusion of the sintered resin powder particles occurs. The resulting preforms can then be cooled for later thermoforming or can be directly transferred to thermoforming molds for forming into desired shaped articles. It is also possible to form at least shallow cans, lids or other items directly in the forging step.
REFERENCES:
patent: 2782180 (1957-02-01), Weidman
patent: 3662052 (1972-05-01), Nowak et al.
patent: 3709965 (1973-01-01), Campbell
patent: 3739052 (1973-06-01), Ayres et al.
Bradley Norbert L.
Cleereman Kenneth J.
Wessling Ritchie A.
Hall James R.
Hessenaur, Jr. Lloyd E.
The Dow Chemical Co.
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