Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Perforation by differential fluid pressure; or smoothing,...
Patent
1980-04-18
1982-03-02
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Perforation by differential fluid pressure; or smoothing,...
264154, 264DIG70, B29C 1714
Patent
active
043177921
ABSTRACT:
A process for the manufacture of thermoplastic sheet having elliptical perforations including a rotatable molding element having a series of hexagonal-shaped depressions having centered therein elliptical holes, the elliptical holes having a major axis and a minor axis, the major axis being oriented parallel to the direction in which the molding element is rotated, a means for applying a fluid pressure differential to a surface of the thermoplastic sheet to force the sheet against the molding element to effect rupturing of the sheet and the formation of elliptical holes in the sheet.
REFERENCES:
patent: 3038198 (1962-06-01), Schaar
patent: 3394211 (1968-07-01), MacDuff
patent: 3682760 (1972-08-01), Fairbanks
patent: 4151240 (1979-04-01), Lucas et al.
Adams James M.
Raley Garland E.
Ethyl Corporation
Johnson Donald L.
Lowe James B.
Sieberth John F.
Spielman, Jr. Edgar E.
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