Method to automatically determine the size distribution of shive

Details Method to automatically determine the size distribution of shive Method to automatically determine the size distribution of shive

1986-02-11

1987-09-22

Levy, Stewart J.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

G01N 1506

Patent

active

046946837

ABSTRACT:
An apparatus to automatically determine on-line, the shive content and shive size distribution of a wood pulp: The apparatus includes a line having an inlet and outlet, and a plug for closing the line. A motor and gear displaces the line with respect to the plug for defining a gap. A transducer measures the size of the gap. A sensor monitors impedances in the line caused by the accumulation of oversized shives at the gap. Responsive to the sensor, is a device for releasing the impedance by rapidly enlarging the gap, each release during a time period being registered by a counter. A controller correlates each of the counts with the corresponding size of gap to establish the content and size distribution of the shives. The method comprises passing through a measured variable gap a measured flow of wood pulp, measuring the pressure increase caused by the shives exceeding the size of the gap, enlarging the gap to allow the passage of all shives when the pressure has reached a predetermined level, repeating the same while automatically varying the size of the gap and registering over time the number of occurrences the gap is enlarged for each gap size and correlating the number of occurrences and the sizes of gap to automatically determine on-line the shive content and shive size distribution.

REFERENCES:
patent: 3893334 (1975-07-01), Williams
patent: 4399691 (1983-08-01), Janssen
patent: 4554051 (1985-11-01), Danforth

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