Douglas fir

– average moisture content 125

– chemical composition of wood 23

– lignin weight fractions 213

– spiral thickenings 44

Downflow reactors

– atmospheric 624–625

– low consistency discharge 625

Downflow single-vessel hydraulic digester, Lo-

Solids™ process 390

DP 25, 1020, 1036, 1058

– alkali cellulose 1057

– carbohydrate degradation in kraft cooking

kinetics models 193–197

– carbohydrates 174–175

– cellulose 42, 256, 935

– cellulose acid hydrolysis 416

– cellulose chain scissions 216–217

– degree of packing 428

– dissolving pulp characterization 1061

– hemicelluloses 28

– polymer fractionation 1252

– reduction in cellulose acid hydrolysis 416

– water prehydrolyzate neutral sugar

Fraction 340

– see also polymerization, degree of

DPM 165, 167–168, 173, 638, 656

– structure and relative oxygen susceptibility

– structures 713

DR 115–116

– see also displacement ratio, reduction

Efficiency

Drag force, on settling particle 581

drainage, pulp washing theory 513–516

Drainage resistance

– pulp 1281–1283

– specific 515

Drainage time, pulp 1283

Drainage velocity equation 516

Dregs, white liquor preparation processes

Driving unit, drum debarker 74

drop-off systems, paper collection 1179–1180

Drum, support 74

drum chipper 84–86

– layout 86

drum debarker 72–76

Drum displacer (DD), pulp washing

equipment 549–550

Drum rotation speed, in relation to relative

Pressure washer capacity 536

Drum washers

– conventional 547–549

– rotary 547–550

DrumMatic™ 95–96

Dry debarking 74