Press shoe with wedge shaped hydrostatic pocket

Details Press shoe with wedge shaped hydrostatic pocket Press shoe with wedge shaped hydrostatic pocket

1992-12-15

1993-11-16

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

162205, 162361, D21F 302

Patent

active

052620115

ABSTRACT:
A press shoe for a shoe press with extended nip, said press shoe is of combined hydrostatic and hydrodynamic type and has a plurality of hydrostatic pressure pockets, each of which is preceded by a leading land surface and followed by a trailing land surface and into which lubricant is supplied under pressure. Each pressure pocket has a first pocket zone in which a hydrodynamic pressure shall be created and which comprises a bottom surface located at gradually decreasing depth from the concave surface portion of the press shoe seen in the direction of rotation of the belt member, said depth being zero at the trailing end of the pressure pocket. The bottom surface forms an angle .alpha. of from 0.degree. to about 2.degree. with a tangent to the concave surface portion of the press shoe at the trailing end of the pressure pocket. Further the first pocket zone is preceded by a second pocket zone comprising a plane bottom surface forming an angle .beta. of from 0.degree. to about .+-.10.degree. with a plane that coincides with the bottom surface of the first pocket zone.

REFERENCES:
patent: 4661206 (1987-04-01), Heitmann et al.
patent: 4917767 (1990-04-01), Ilmarinen et al.
patent: 5084137 (1992-01-01), Ilmarinen et al.
patent: 5110417 (1992-05-01), Lehtonen et al.

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