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Semiconductor manufacture

Electromagnetic-extended-nip-press

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Electromagnetic extended nip press

Details

Inventors: Wedel, Gregory L.;
Assignee: Beloit Corp. (Beloit, WI)
Primary Examiner: Bashore; S. Leon
Assistant Examiner: Hastings; K. M.
Attorney, Agent or Firm: Veneman; Dirk J., Campbell; Raymond W., Archer; David J.

Extended nip presses for papermaking machines and the like are provided with electromagnets immediately adjacent the press nip to create or augment the nip pressures or loads. The electromagnets have massive, wide large areas, establishing a concentrated magnetic field between conforming opposite sides of the entire nip area eliminating gaps heretofore encountered in magnetic presses. Non-magnetic belts convey wet webs through the nips of dewatering presses and dry web calendering presses can have the webs directly engage a calender roll conveying the web through the nip.

DETAILED DESCRIPTION I claim as my invention: 1.
An extending nip press for a papermaking machine through which a formed web passes comprising a non-magnetic impermeable belt, a felt, and an extended nip defined by a first nip member and a second nip member which conforms to the first nip member, mounting means for one of said nip members permitting movement toward and away from the other nip member, said press further comprising in combination electromagnetic means disposed within the first nip member for generating flux for electromagnetically cooperating with the second nip member, said electromagnetic means being coextensive with the extended nip in a direction transverse to the direction of movement of the web through the nip, a non-magnetic shoe supported by and covering said electromagnetic means disposed between said electromagnetic means and the belt to be urged against the belt upon excitation of said electromagnetic means for generating sufficient force between the second nip member and the felt to remove water from the web by pressure, and said shoe having a thickness selected for minimizing the distance between the electromagnetic means and the second nip member such that substantially all of said flux passes through said shoe to said second nip member with substantially no air gap therebetween for increasing the pressure exerted on the web during excitation of said electromagnetic means.
2.
The press of claim 1 wherein the second nip member is a ferromagnetic roll and the shoe has an arcuate configuration conforming with the roll periphery.
3.
The press of claim 1 wherein the first and second nip members each have electromagnetic means disposed therein and a non-magnetic shoe is supported by each electromagnetic means.
4.
The press of claim 1 wherein the electromagnetic means has a ferromagnetic core block traversing the full width of the formed web with an open top slot along the length thereof covered by the shoe, and an exciting coil of the electromagnetic means has a leg filling said slot

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