Method and apparatus for determining the fiber orientation of pa

Details Method and apparatus for determining the fiber orientation of pa Method and apparatus for determining the fiber orientation of pa

1994-02-25

1995-12-12

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

356429, 250225, G01N 2186

Patent

active

054752337

ABSTRACT:
A method and apparatus for rapidly and accurately determining fiber orientation of paper which is at a standstill or moving in a paper machine employs a projector which projects a light beam perpendicularly to an incident surface of the paper to be tested. The light beam reflected by the incident paper surface is caught by eight or more light receivers distributed on a circumference of a circle on the incident surface side of the paper. The circle is defined in a plane extending in parallel to the paper surface and having an axis at the point where the above-mentioned parallel plane intersects an axis of the incident light beam. A light information signal output from the light receivers are subjected to a processing to obtain the fiber orientation characteristics, such as fiber orientation index value and fiber orientation angle.

REFERENCES:
patent: 4092068 (1978-05-01), Lucas et al.
patent: 4180830 (1979-12-01), Roach
patent: 5252836 (1993-10-01), Matthews et al.

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