Paper making and fiber liberation – Apparatus – Measuring – testing – inspecting – indicating or illuminating
Patent
1985-03-05
1988-07-19
Alvo, Steve
Paper making and fiber liberation
Apparatus
Measuring, testing, inspecting, indicating or illuminating
162 4, 162 49, 356441, 356442, D21F 706, G01N 2100, G01N 2185
Patent
active
047583088
ABSTRACT:
In a contaminant detector for processing paper pulp including sticky contaminants, a pulp sample is diluted to less than 0.5% consistency and passed through a concentrator from a plurality of classified samples having heavy and light particles. The inclined classified samples are again diluted to less than 0.5% consistency and passed as thin sample flow through an open channel having a light transmitting base. The flow is back lighted and a photodetector includes a linear array of sensitive elements aligned to receive the transmitted light. The sensitive elements aligned with particle creates a signal proportional to the width. By rapid sequential activation of the elements, a digital data stream is created which is processed by a microprocessor to determine the particle size and produce a plurality of contaminant relative signals related to different classified size ranges, such as heavy, medium and small contaminant particles. A particle removal includes sequential stages for successively removing the heavy, medium and small sized contaminants, with a control for each stage. The pulp sample is taken at a highest concentration location and the contaminant related signals are connected to actuate the corresponding controls for the several stages.
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