Apparatus for the on-line measurement of the opacity of a paper

Details Apparatus for the on-line measurement of the opacity of a paper Apparatus for the on-line measurement of the opacity of a paper

1978-04-06

1980-09-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250571, 356432, H01J 314

Patent

active

042245133

ABSTRACT:
A method of on-line control of opacity of moving sheet material being produced by a paper making machine includes an opacity control loop where an opacity additive is controlled and a basis weight control loop where the stock input to a headbox is controlled. These two control loops are decoupled by means of an opacity to stock feed forward and a basis weight to titanium dioxide feed forward. In addition, the effect of moisture change is decoupled from opacity. The opacity of the moving sheet material is measured by a system which employs a visible source and detector on opposite sides of the sheet. A diffusing window is placed both between the sheet and the source as well as between the sheet and the detector.

REFERENCES:
patent: 2474828 (1949-07-01), Connelly et al.
patent: 2633784 (1953-04-01), Cofield
patent: 3793524 (1974-02-01), Howarth

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