Paper making and fiber liberation – Apparatus – Digester
Reexamination Certificate
2006-08-29
2006-08-29
Halpern, Mark (Department: 1731)
Paper making and fiber liberation
Apparatus
Digester
C162S055000, C162S056000, C162S057000, C162S065000, C162S251000, C209S017000, C209S270000, C209S306000, C210S414000, C210S415000, C366S103000
Reexamination Certificate
active
07097740
ABSTRACT:
The invention relates to a method and a screen for screening two or more pulp mixtures with different roughness. The screen comprises a first screen cylinder and a second screen cylinder. A coarse first pulp mixture is fed into the inlet end of the first screen cylinder, and a second, less coarse pulp mixture is supplied to the second screen cylinder. The pulp mixtures are screened by means of a screen surface of the screen cylinders into accept that passes apertures provided in the screen surface and reject that does not pass the apertures. The accept from the second cylinder is conveyed by means of a guide tube provided between the cylinders towards the inlet end of the first cylinder and it is finally mixed with the first pulp mixture. The accept from the first and the second pulp mixture passes the screen surface of the first screen cylinder.
REFERENCES:
patent: 1183298 (1916-05-01), Haug
patent: 1 374 358 (1974-11-01), None
patent: WO 00/58549 (2000-10-01), None
Alston & Bird LLP
Halpern Mark
Metso Paper Inc.
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