Method and apparatus for detecting web discontinuities

Details Method and apparatus for detecting web discontinuities Method and apparatus for detecting web discontinuities

1991-07-17

1993-09-07

McGraw, Vincent P.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

356429, 356431, G01N 2186, G01N 2189

Patent

active

052434087

ABSTRACT:
The detection of abrupt changes in opacity of a moving sheet resulting from, for example, an overlap type splice is provided. The web material is fed between two identical light emitter/detector pairs such that its opacity is measured. An abrupt change in web thickness passing through one light emitter/detector pair is sensed as a change in web opacity. The difference and resulting imbalance with the opacity signal from the other light emitter/detector pair, not yet interrupted with the abrupt change, is utilized to indicate the presence of the defect which, in this application, could be an overlap splice. The disclosed invention, although adaptable to thicker textile webs, specifically relates to a device for the detection of overlap splices in a moving sheet representative of all the paper types required by the cigarette, printing, and labeling industries.

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