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active alkali alkali charge Atlanta and Montreal bark batch digester black liquor blowing bottom bulk density carbonate cellulose centrifugal cleaner chemical chip quality chip screen chip thickness chipper cleaning consists contains continuous digester cooking liquor delignification dilution disc dissolved effective alkali equipment evaporator extractives Figure flow gases green liquor H-factor hardwood heating hemicellulose higher impregnation ions Joint Textbook Committee Kamyr digester kappa number knotter Kocurek kraft process kraft pulping lignin linerboard liquor circulation liquor-to-wood ratio lower mole molecules multiple-effect evaporators Na2S NaOH normally operation oversize overthick Paper Industry papermaking parenchyma particles pinchips presteaming produced Pulp and Paper pulp quality pumped recovery furnace refined reject rate removed roundwood screen openings screen rejects Smook sodium carbonate sodium hydroxide sodium sulfide softwood specific gravity stage steam tank TAPPI thickening top liner tracheids tree variables vessel elements wash liquor wash water washing efficiency washing zone white liquor wood