Method of making a plurality of substantially identical flexible

Details Method of making a plurality of substantially identical flexible Method of making a plurality of substantially identical flexible

1975-09-05

1977-06-07

Kucia, Richard R.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Forming plural articles

264286, 264320, 264322, B29D 900

Patent

active

040284611

ABSTRACT:
A method of making a plurality of substantially identical flexible diaphragms for control devices comprising the steps of providing a plurality of sheets of polyester film each being approximately 0.0005 to 0.0010 of an inch thick and each being a circular disc approximately 41/2 inches in diameter and forming the diaphragms from the sheets so that each diaphragm has an annular corrugation formed therein concentric with the center thereof and inboard of the outer periphery thereof, the step of forming the diaphragms comprising the steps of disposing the sheets in stacked aligned relation in a mold and compressing and heating the sheets in the mold in the stacked aligned relation thereof to substantially simultaneously heat form the corrugations in the sheets to thereby make the diaphragms substantially identical to each other.

REFERENCES:
patent: 3131565 (1964-05-01), Amlie
patent: 3293349 (1966-12-01), Diebold
patent: 3546221 (1970-12-01), Johnson
patent: 3661060 (1972-05-01), Bowen
patent: 3751328 (1973-08-01), Roberts
T941,018, Dec. 1975, Clarke, 264/320 X.

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