Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-11-20
1976-05-04
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
242 65, 340259, G01R 3112, B65H 1708
Patent
active
039551369
ABSTRACT:
A machine and method for detecting and identifying the approximate location of air leak-causing defects in flat, thin rubber stock used to manufacture inflatable, expandable bags. The detection of air leak-causing defects is accomplished by continuously moving at a relatively constant rate the flat rubber stock to be tested between two cylindrical rollers. These two rollers are maintained at a voltage which will fluctuate in response to any air leak-causing defect passing between them. The machine disclosed is composed of a frame to which is mounted a feed spool and a take-up spool, numerous supports and guides, a set of two test rollers, a dielectric analyzer, and a marker which punches the edge of the rubber stock adjacent to the in-line location of a detected defect. The disclosed machine and method enable detection of small pin-hole sized defects often undetectable to the naked eye.
REFERENCES:
patent: 2087783 (1937-07-01), Savage
patent: 2194078 (1940-03-01), Simonds
patent: 2890409 (1959-06-01), Van Krevelen
patent: 2896196 (1959-07-01), Hartford et al.
patent: 3321703 (1967-05-01), Tyszewicz
patent: 3695540 (1972-10-01), Grantham
patent: 3792458 (1974-02-01), Smith et al.
Ranallo Henry U.
Wiltshire Arthur J.
Strecker Gerard R.
Structural Fibers, Inc.
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