Method for the on-line control of the opacity of a paper sheet

Details Method for the on-line control of the opacity of a paper sheet Method for the on-line control of the opacity of a paper sheet

1974-09-25

1978-07-04

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

With measuring, inspecting and/or testing

162253, 162254, 162263, 162DIG6, 162DIG11, 356199, D21D 300, D21F 700

Patent

active

040986411

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.

REFERENCES:
patent: 3035967 (1962-05-01), Sacksen et al.
patent: 3572361 (1971-03-01), Terhar et al.
patent: 3687802 (1972-08-01), Rummel et al.
patent: 3737371 (1973-06-01), Bazler et al.
"Some Plain Talk on Digital Computers"; Roberts Pulp and Paper; 8-12-68; pp. 32-37.
Klem, K.H; "Operation and Instrumentation of a Stock Preparation Installation"; Das Papier, 14, no. 109:581-9; 10-1960.
"Automation in the Paper Industry, Part Three" Betts The Paper Maker; Jan. 1969, pp. 50-55.

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