Method and apparatus for measuring the ratio between web tension

Details Method and apparatus for measuring the ratio between web tension Method and apparatus for measuring the ratio between web tension

1979-03-09

1980-11-25

Ruehl, Charles A.

Measuring and testing

Volumetric content measuring

73581, G01L 510, G01H 1300

Patent

active

042351022

ABSTRACT:
A method and apparatus is provided for measuring the ratio between web tension and web substance by causing the web to vibrate at its resonance frequency, measuring the pressure variations or the signal causing the web vibration to produce a first signal, measuring a signal in phase and representative of the vibration of the web and to produce a second signal, comparing the phase difference of the first and second signals so that a deviation from a predetermined phase difference produces an output signal, and controlling the frequency of the signal or pressure variations causing the web to vibrate in response to the output signal so that the predetermined phase difference is maintained.

REFERENCES:
patent: 2729972 (1956-01-01), Schwidetzky
patent: 3470734 (1969-10-01), Agdur et al.
patent: 3850031 (1974-11-01), Schwenzfeier et al.
patent: 3854329 (1974-12-01), Jones
patent: 3871217 (1975-03-01), Miley
patent: 4109520 (1978-08-01), Eriksson

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