Paper making and fiber liberation – Apparatus – Digester
Reexamination Certificate
2006-10-24
2006-10-24
Hug, Eric (Department: 1731)
Paper making and fiber liberation
Apparatus
Digester
C162S233000, C162S055000, C210S498000
Reexamination Certificate
active
07125472
ABSTRACT:
A screen panel for a wood-chip digester, comprises a screen plate having a plurality of slots therein that are curved in the form of an arc. Each slot has a generally parallel-sided middle portion in the middle of the thickness of the screen plate, which middle portion has a width in the range of from 3 mm to 10 mm, and a portion that tapers out at an angle on each side of the middle portion, at a half-angle in the range of from 10° to 20°, for approximately one quarter of the thickness of the plate. All of the slots have their concave sides facing in the upstream direction of chip flow in the digester.
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Baker Jack T.
Drinker Biddle & Reath LLP
Hug Eric
Miller Myles M.
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