Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Patent
1981-06-19
1983-08-16
Alvo, Steve
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
162199, 162252, 162262, 162263, 162274, D21F 148, D21F 1102
Patent
active
043989969
ABSTRACT:
A vacuum control system and method for dewatering fabrics on a papermaking machine including a suction pipe and a vacuum pump connected to the suction pipe to supply a desired vacuum level. The fabric is passed over a slot in the suction pipe so that suction applied therethrough will dewater the fabric. Controls are connected to the suction pipe and to the vacuum pump responsive to an increase in the vacuum level in the suction pipe as fabric permeability decreases to correspondingly lower the speed of the vacuum pump and retain the desired vacuum level in the suction pipe.
REFERENCES:
patent: 3005490 (1961-10-01), Justus
patent: 3077924 (1963-02-01), Eastwood
patent: 3490689 (1970-01-01), Hart et al.
patent: 3935061 (1976-01-01), Biornstad
patent: 4329201 (1982-05-01), Bolton
Lavigne, "Instrumentation Applications", The Foxboro Co., 1979, pp. 208-209, Miller Freeman Publications.
Mokrytzki, "Adjustable Speed Operation of AC Motors Using Slip Energy Control", TAPPI, vol. 64, No. 2, pp. 61-65, Feb. 1981.
Bolton Joseph A.
Duncan Jeffrey B.
Albany International Corp.
Alvo Steve
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