Process for determining dimension errors

Details Process for determining dimension errors Process for determining dimension errors

1988-04-06

1989-11-07

Chin, Peter

Paper making and fiber liberation

Processes and products

With measuring, inspecting and/or testing

162110, 162140, 250571, 250572, 356429, 356430, 356431, D21F 1100

Patent

active

048790001

ABSTRACT:
A method of testing security papers with respect to the positions of a safety thread and water marks to detect errors in the paper is performed by a linewise scanning of a finished paper web. The web has at least two point like measuring marks inserted into it in addition to the water marks, whereby impulses which are originated from these measuring marks are evaluated and the sheet width and the sheet distortion are calculated by comparing the x-y positions of the individual measuring marks with each other. The measuring marks are sharpe edged and rich in contrast. The given edge impulse is evaluated.

REFERENCES:
patent: 3843890 (1974-10-01), Anthony
patent: 3919560 (1975-11-01), Nopper
patent: 4265545 (1981-05-01), Slaker
patent: 4557786 (1985-12-01), Stock et al.
patent: 4570074 (1986-02-01), Jette

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