Presses – With drain means for expressed liquid – Drainage through or along pressure surface
Reexamination Certificate
2008-03-25
2008-03-25
Nguyen, Jimmy T. (Department: 3725)
Presses
With drain means for expressed liquid
Drainage through or along pressure surface
C100S127000, C100S148000
Reexamination Certificate
active
07347140
ABSTRACT:
Screw press for separation of liquid from solid liquid mixtures, especially pulp suspensions, with a casing with perforations for liquid and a screw shaft provided in it between which a circular gap is formed through which the solid liquid mixture is pressed. Furthermore, a counter pressure device in the area of the discharge end of the circular gap is provided. To reduce the space requirement in the discharge area at the discharge end of the circular gap, which makes it possible to reduce the size of the discharge casing and cut costs due to a less complicated design, the counter pressure device has a counter pressure surface, the radius of which is decreasing in the conveying direction of the solid liquid mixture. In this way the solid liquid mixture with the liquid largely extracted will be redirected radially inwards and outside of the counter pressure device no additional space is needed to discharge the solid liquid mixture with the liquid largely extracted, so that the discharge casing may be reduced in size correspondingly.
REFERENCES:
patent: 1835789 (1931-12-01), Lang
patent: 2930314 (1960-03-01), Carlson
patent: 4915830 (1990-04-01), Mackay et al.
patent: 5515776 (1996-05-01), Scheucher et al.
patent: 6550376 (2003-04-01), Johnston
Brunnsteiner Rupert
Hausjell Dietmar
Scheucher Peter
Stadlauer Rudolf
Alix Yale & Ristas, LLP
Andritz AG
Nguyen Jimmy T.
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