On-line fiber orientation distribution measurement

Details On-line fiber orientation distribution measurement On-line fiber orientation distribution measurement

1989-01-05

1990-09-11

McGraw, Vincent P.

Optics: measuring and testing

By monitoring of webs or thread

162263, 250559, 250571, G01N 2186

Patent

active

049557203

ABSTRACT:
The present invention discloses a method and apparatus for the on-line measurement of fiber orientation in a translucent sheet. To measure the fiber orientation, coherent light is directed onto one surface of the sheet in a pattern of sufficient intensity to produce a second pattern on the other surface of the sheet. The shape of the second pattern is determined, at least in part, by the orientation of the fibers in the sheet. A sensing apparatus including a video camera and frame grabber, views the second pattern and produces a freeze frame image signal. Even though the second pattern may be moving, the sensing apparatus freezes this motion and produces the freeze frame image signal to represent a stationary image of the second pattern. The freeze frame image signal is analyzed to determine the shape of the second pattern and from this shape the orientation of the fibers in the sheet is determined. Also disclosed is an apparatus for using the method and an improved system for making paper using the method.

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patent: 4648712 (1987-03-01), Brenholdt
Dialog Files 351 and 305; conducted Oct. 1, 13, 1987.
Lars Rudstrom and Ulf Sjolin, "A Method for Determining Fiber Orientation in Paper by Using Laser Light", Svensk Papperstidning, vol. 73, No. 5, p. 117, Mar. 15, 1970.
"An On-Line Inspection Device, Web Defect Detection with Lasers", reprinted from TAPPI, vol. 62, No. 6, p. 69, Jun. 1979.
Alois Kohl and Wolfgang Hartig, "Optical Determination of Fiber Orientation", no citation available.
Joseph A. Bolton, "Development Behind a Full Width Real Time Formation Sensor--`FORMSPEC`", no citation available.
Paul Lippke GmbH & Co., "Optical Fiber Orientation Measurement for On-Line Use".
Paul Lippke GmbH & Co., "Moisture, Basis Weight, Ash, Caliper, Opacity, Smoothness".
Intec, "Vigilant 100".
Unknown, "With a Revolutionary Defect Processing Architecture . . . ".
Robotest, "PaperLab-1".
Albany International, "WEBSPEC/Defect Detection".

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