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US 4,948,467 AGranted
Extended nip press with induced repulsion
AssigneeThe Black Clawson Company
InventorRichard W. Creagan
Life of this patent
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AssigneeThe Black Clawson Company
InventorRichard W. Creagan
Estimating the term…
An extended nip press for papermaking machine extracts water from a web of paper on a forming felt passing over a backing roll employing electromagnetic repulsion forces. In one embodiment, a belt is formed with permanent magnets which have thickness oriented poles and a like pole is provided external to the belt surface in non-contacting relation to provide a repulsion force to the belt which is transmitted by the belt to the felt and the paper. In another embodiment, the belt is formed of current-carrying nonferrous material and a repulsion force is formed by inducing current to flow in the belt by causing current to flow in an adjacent coil in non-contacting relation to the belt. In either embodiment, air pressure housing may be positioned over the electromagnet or conductor, to cool the electromagnet and to apply an air pressure force against the belt in the same direction as that of the induced or repulsion force.
An extended nip press for a papermaking machine through which a web of paper passes between a forming felt and a backing roll for the extraction of water therefrom, the improvement comprising:
Dependencies are inferred from the claim text.