Chip sizing process
AssigneeWeyerhaeuser Company
InventorRobert A. Brown
Life of this patent
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Abstract
A chip screening system has a primary screening station for dividing an incoming flow of chips into a first acceptable fraction and a second fraction having acceptable chips and also both oversized and overthick chips. The second fraction is directed to a second screening station where the incoming flow will again be fractionated into an acceptable flow being screened primarily according to thickness and a second fraction being composed of oversized and overthick chips. The second fraction is then directed to a size reducing station.
Claims9
A process for fractionating and sizing a flow of incoming wood chips from a known source into an output flow of chips falling in a predetermined size range with substantially all of the chips in the output flow having a thickness falling within a predetermined thickness range, comprising the steps of:
- directing the incoming flow to a primary screening station where at least two fractions are generated with a first fraction containing chips falling substantially within the predetermined acceptable size and thickness range and a second fraction comprising at least 30% by weight of the incoming flow having a substantial majority of the oversize and overthick chips together with a substantial amount of chips falling within the acceptable size and thickness range, and
- directing the second fraction to a second screening station where at least two fractions are generated with a fourth fraction containing chips falling substantially within the predetermined acceptable size and thickness range and a fifth fraction containing chips substantially all of which are overthick.
Dependencies are inferred from the claim text.