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US 4,374,795 AGranted
Production of mold charge of elastomeric material containing magnetic oxide filler
AssigneeBell Telephone Laboratories, Incorporated
InventorsJohn P. Keilp, Warren F. Moore, Victor Sirbu
Life of this patent
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Abstract
A method for preforming magnetic drum material involves the use of a hydraulic press and sleeve which in turn compresses the material and then cuts the material into a specific shape. This process is repeated until the material builds up in the sleeve to the required charge thickness. This method has improved the molding process by eliminating air and gas voids in the molded magnetic drum.
Claims4
A method of producing a mold charge from an elastomeric molding material comprising the steps of:
- (1) applying a compression force to a piece of said material to flatten said material and drive out entrapped air and gas therefrom,
- (2) applying a shearing force to said material to shape said material into the desired cross-sectional outline,
- (3) drawing another piece of said material under said prior piece and repeating steps (1) and (2), and
- (4) building up said material by repeating steps (1) through (3) until the desired air- and gas-free mold charge thickness is obtained.
1 more element
Dependencies are inferred from the claim text.