METHOD AND APPARATUS FOR DETERMINING THE FIBER ORIENTATION OF PAPER
Disclosed are a method and apparatus for rapidly and accurately determining fiber orientation of stationary or moving paper in a paper machine useful for grade study and quality control of the paper. A projector projects an unpolarized light beam perpendicularly to a surface of the paper to be teste...
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Format: | Patent |
Sprache: | eng ; fre |
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Zusammenfassung: | Disclosed are a method and apparatus for rapidly and accurately determining fiber orientation of stationary or moving paper in a paper machine useful for grade study and quality control of the paper. A projector projects an unpolarized light beam perpendicularly to a surface of the paper to be tested, then a light beam reflected by the paper surface is caught by eight or more light receivers distributed on a circumference of a circle defined, on the incident side of the unpolarized light beam, in a plane extending in parallel to the paper surface around a point at which the above-mentioned parallel plane intersects an axis of the incident light beam, and a light information signals output from these light receiving means are subjected to a predetermined arithmetic processing to obtain the fiber orientation characteristics such as fiber orientation index value and fiber orientation angle. |
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