Suction press roll
Electromagnetic extended nip press
Dual cycle gas turbine engines Patent #: 4803837
ApplicationNo. 353289 filed on 05/17/1989
US Classes:162/358.3, Extended nip press100/153, Co-acting presser roll100/917, MAGNETIC162/305Molds with subsequent separate pressing means
ExaminersPrimary: Hastings, Karen M.
Attorney, Agent or Firm
Foreign Patent References
International ClassD21F 003/02
AbstractAn 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.