Slotted screen for digester
AssigneesJack T. Baker, Myles M. Miller
InventorJack T Baker
Life of this patent
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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 width in the range of from 3 mm to 10 mm. One form of 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 5° to 20°, for approximately one quarter of the thickness of the plate. Another form of slot tapers out from one side of the plate to the other side. All of the slots have their concave sides facing in the upstream direction of chip flow in the digester.
Claims22
A screen panel for a wood-chip digester, comprising a screen plate having a plurality of slots therein, wherein said slots are curved and have a width in the range of from approximately 3 mm to approximately 10 mm and a chord length in the range of from approximately 0.75 inches to approximately 3 inches.
A screen panel for a wood-chip digester, comprising a screen plate having a plurality of slots therein, wherein said slots are curved in the form of an arc and have a width in the range of from approximately 3 mm to approximately 10 mm and a radius of curvature in the range of from approximately 0.75 inches to approximately 3 inches.
A screen panel for a wood-chip digester, comprising:
- a screen plate having a plurality of slots therein;
- wherein said slots are curved in the form of an arc;
- wherein each said slot is defined between two sides having equal radii of curvature in the range of from approximately 0.75 inches to approximately 3 inches;
- wherein said slots have a chord length in the range of from approximately 0.75 inches to approximately 3 inches;
- wherein said slots have 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 approximately 3 mm to approximately 10 mm;
- wherein the slots and have a portion that tapers out at an angle on at least one side of the middle portion, at a half-angle in the range of from approximately 10° to approximately 20°, for approximately one quarter to one half of the thickness of the plate;
- wherein all of the slots have their concave sides facing in the same direction;
- and
- wherein said panel is arranged to be installed in a digester with that direction being the upstream direction of chip flow.
A screen panel for a wood-chip digester, comprising:
- a screen plate having a plurality of slots therein;
- wherein said slots are curved in the form of an arc;
- wherein each said slot is defined between two sides having equal radii of curvature in the range of from approximately 0.75 inches to approximately 3 inches;
- wherein said slots have a chord length in the range of from approximately 0.75 inches to approximately 3 inches;
- wherein said slots have a width in the range of from approximately 3 mm to approximately 10 mm at one side of said screen plate;
- wherein said slots taper out at an angle from said one side of the screen plate at a half-angle in the range of from approximately 5° to approximately 20° to the other side of the plate;
- wherein all of the slots have their concave sides facing in the same direction;
- and
- wherein said panel is arranged to be installed in a digester with that direction being the upstream direction of chip flow.
A wood-chip digester having a screen panel comprising a screen plate having a plurality of slots therein, wherein said slots are curved and have a width in the range of from approximately 3 mm to approximately 10 mm and a chord length in the range of from approximately 0.75 inches to approximately 3 inches.
A wood-chip digester having a screen panel comprising a screen plate having a plurality of slots therein, wherein said slots are curved in the form of an arc and have a width in the range of from approximately 3 mm to approximately 10 mm and a radius of curvature in the range of from approximately 0.75 inches to approximately 3 inches.
Dependencies are inferred from the claim text.