Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Patent
1974-06-05
1976-01-06
Bashore, S. Leon
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
162253, 162256, 162258, 162263, 2351511, D21F 106, D21F 500, D21F 902, D21F 1102
Patent
active
039309347
ABSTRACT:
Specifically disclosed is the combination of a paper making machine and a control system including an automatic arrangement which, on demand of the machine operator, performs a coordinated machine speed increase, maintaining the paper sheet characteristics substantially constant until the dryer steam pressure or the steam valve opening reaches a limit. During the speed increase, a number of other machine variables are compared with set limit values and the speed increase is discontinued when a limit is exceeded for a predetermined time period. When the steam pressure has been at a limit, or the steam valve has been wide open, for a predetermined time period the control system, upon sensing the limit being reached, switches to a dryer limited mode of operation wherein the steam pressure is maintained at the limit or the steam valve is locked open. The sheet moisture content is then controlled by a combination of automatic stock valve and machine speed adjustments, while basis weight is controlled by coordinated machine speed adjustments. The control system is adapted for universal use with many machine arrangements which may have separated and/or split dryer sections for rewet or coating operations and the like and/or curl control. To this end, the controller includes a system of logic which determines the optimum control procedure in each case.
REFERENCES:
patent: 3564224 (1971-02-01), Chope
patent: 3564724 (1971-02-01), Keyes et al.
patent: 3649444 (1972-03-01), Futch, Jr.
patent: 3666621 (1972-05-01), Adams
patent: 3687802 (1972-08-01), Rummel et al.
"Some Plain Talk on Digital Computers"; Roberts Pulp & Paper; Aug. 12, 1968; p. 32-37.
"Goal: Computer Control from 1 year of Order"; Pulp & Paper; Apr. 1970.
Alvo Steve
Bashore S. Leon
Fryer III William T.
Industrial Nucleonics Corporation
Lowe Allan M.
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