Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Patent
1990-10-12
1992-03-10
Alvo, Steve
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
162256, 162262, 162263, 73 377, 73159, 226100, 242 57, D21F 706
Patent
active
050947184
ABSTRACT:
An apparatus and method for suppressing flutter of a moving web manufacturing operation to include a sensor for sensing the pressure of air in a region proximate the web, which sensor generates a pressure signal representative of the air pressure, a signal processor, connected to receive the pressure signal and to derive therefrom a negative feedback suppression signal phase-shifted to attenuate the air pressure, and an air modulator, positioned to modulate the air in the region proximate the web, which modulator receives the suppression signal and modulates air in response thereto so that flutter is attenuated. The modulator can be a speaker placed in an air supply duct, and in another embodiment it is placed directly in a web pocket.
REFERENCES:
patent: 4031741 (1977-06-01), Schaming
patent: 4496428 (1985-01-01), Wells
Alvo Steve
Union Camp Corporation
Wissing William K.
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