Rawmaterial Bwa

8/24/2008

Resources:

Wood flow for integrated forest products manufacture

Pulp Wood Measurement: • Economic basic Æ the weight of dry wood • Not possible to measure dry weight directly: • Devised estimation methods Æ wood volume or wet weight Æ conversion factor: densityy or dryy weight g • Problem with density and dry weight? • Measurement : cord, cunit, unit: •

Cord Æ wood in pile of : 4 ft logs x 8 ft wide x 4 ft height = 128 ft3 (cords is unreliable measurement)

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Cunit Æ solid volume measurement ~ 100 ft3 of solid wood) • Predetermined table Æ after measuring log number and bole size • Volume Æ water displacement or by green weight • Unit Æ bulk volume of chips ~ 200 ft3 ~ app.. 1 ton OD wood

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Volumetric wood measurement: • 1 cord = 0.83 cunit = 1.04 unit • 1 cunit = 1.25 unit = 1.2 cord • 1 unit = 0.96 cord = 0.8 cunit

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8/24/2008

Wood Handling in Modern Pulp Mills

Slasher Deck

saw

• log cutting for ground wood systems • log cutting for long, small dia wood = less wood losses

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8/24/2008

BARKING: Woodroom chips free of bark and dirt

BARKING

MECHANICAL

HYDRAULIC

Drum Barker Ring Barker Rosser Head

Drum Barker

Rosser Head Barker

Ring Barker

Hydraulic Barker

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8/24/2008

GentleFeed Drum Infeed

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Less wood losses - better chip quality High availability Low maintenance Less noise

Function of debarking drum:

• Debark logs. Logs are rubbing against each others • Remove bark from log flow • Remove sand and small stones from log flow

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