Method of paper machine control and apparatus for the method

Details Method of paper machine control and apparatus for the method Method of paper machine control and apparatus for the method

2005-06-07

2005-06-07

Picard, Leo (Department: 2125)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Product assembly or manufacturing

C034S446000, C162S253000

Reexamination Certificate

active

06904331

ABSTRACT:
The present invention is characterized in that in a simulation for predicting a steam pressure setpoint after grade change, an initial moisture percentage is evaluated from differences between bone-dry basis weights and between machine speeds before and after grade change; the bone-dry coated weight of a size is evaluated from the flow rate and concentration thereof; and then the dryer inlet moisture percentage of a web after a size press is calculated from the coated weight. Thus, the invention intends to improve the quality of products through precise dryer control, as well as reduce the time required for grade change, by precisely predicting the web's initial moisture percentage at the dryer inlet after grade change and precisely and quickly controlling dryer steam pressure during grade change.

REFERENCES:
patent: 3801426 (1974-04-01), Putman et al.
patent: 3886036 (1975-05-01), Dahlin
patent: 6365004 (2002-04-01), Hamstrom et al.
patent: 6473670 (2002-10-01), Huhtelin

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