System for determining the pressure in the nip between two rolle

Details System for determining the pressure in the nip between two rolle System for determining the pressure in the nip between two rolle

1986-09-11

1988-05-17

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to force

310338, 310800, G01L 500, H01L 2720

Patent

active

047442530

ABSTRACT:
A system is provided for determining the pressure exerted on an object passed between two rollers. The system comprises a sensor of pressure-sensitive material and a transmission/receiving device for generating an ultrasonic wave in the sensor and then detecting the reflected pulse received by the sensor. The time difference between the transmission pulse and the pulse received by the sensor is related to the pressure exerted on the object in the nip. Preferably, the sensor consists of a laminated film comprising in sequence: a first layer of electrically conducting material; a layer of polyvinylidene fluoride; a second layer of electrically conducting material having detector regions; a layer of dielectric material; and a third layer of electrically conducting material.

REFERENCES:
patent: 4016756 (1977-04-01), Kunkle
patent: 4183010 (1980-01-01), Miller
patent: 4356423 (1982-10-01), Gudzin
patent: 4555953 (1985-12-01), Dario et al.
patent: 4633122 (1986-12-01), Radice

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