Apparatus for measuring diagonal and simplex paper curl

Details Apparatus for measuring diagonal and simplex paper curl Apparatus for measuring diagonal and simplex paper curl

1986-10-23

1988-05-31

Alvo, Steve

Paper making and fiber liberation

Apparatus

Measuring, testing, inspecting, indicating or illuminating

356371, 356376, 356387, G01B 1124

Patent

active

047479116

ABSTRACT:
A method and apparatus for measuring the curl in a vertically suspended sheet of paper is disclosed. A pair of spaced horizontal laser beams is directed through a pair of collimating lenses to produce laser beams having a given width. The collimated beams are directed against the upper and lower side edges of the sheet in a direction parallel with the planar face of the sheet. The shadow images cast from the interruption of the pair of beams by the upper and lower edges of the sheet are detected and compared, with the difference between the images corresponding with the diagonal curl of the paper sheet.

REFERENCES:
patent: 3481194 (1969-12-01), Sivilotti et al.
patent: 3604940 (1971-09-01), Mathews
patent: 3688571 (1972-09-01), Atkins et al.
patent: 4322971 (1982-04-01), Strobel
patent: 4332477 (1982-06-01), Sato
patent: 4650334 (1987-03-01), Alster et al.
Paper Curl and Shrinkage Tester (Gurley-Witham No. 4140) Nov. 15, 1941.

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