Apparatus for sensing the thickness of a pulp suspension on the

Details Apparatus for sensing the thickness of a pulp suspension on the Apparatus for sensing the thickness of a pulp suspension on the

1987-07-31

1988-12-06

Alvo, Steve

Paper making and fiber liberation

Apparatus

Measuring, testing, inspecting, indicating or illuminating

73629, 73632, 162252, D21F 706, G01N 2900

Patent

active

047894318

ABSTRACT:
Apparatus for sensing the thickness of a pulp suspension, having zones or slices, on the forming wire of a paper making machine includes an array of ultrasonic transducers located in the apertures of a structural member mounted in a cross-direction under the forming wire near the headbox of the machine. Each ultrasonic transducer is mounted on a flexible sheet which is mounted to an aperture and the transducer moved into close proximity to the bottom of the forming wire by means of air pressure in the structural member. A second array of transducers downstream of the first can be utilized for diagnostics.

REFERENCES:
patent: 2743429 (1956-04-01), Endman et al.
patent: 3442756 (1969-05-01), Lehtinen
patent: 3485088 (1969-12-01), O'Connor
patent: 3574624 (1986-03-01), Lehtinen et al.
patent: 4402604 (1983-09-01), Nash
patent: 4470307 (1984-09-01), Genter

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