制浆造纸专业单词2

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1、Chpater8PreparationofPapermakingStockStockpreparationistheinterfacebetweenthepulpmillorpulpwarehouseandthepapermachine.Inanintegratedmill,stockpreparationbeginswithdilutionoftheheavystockatthedischargeofthehigh-densitypulpstoragechestsandendswiththeblendedpapermakingfurnishinthemachinechest.In山

2、eindependentpapermill,stockpreparationbeginsbyfeedingpulpbalesintotherepulpingsysterm.Thebasicobjectivesinstockpreparationaretotaketherequiredfibrousrawmaterials(pulps)andnon-fibrouscomponents(additives),treatandmodifyeachfurnishconstituentasrequired,andthencombinealltheingredientscontinuouslya

3、nduniformlyintothepapermakingstock・Theprimaryconcernistoproduceauniformpapermakingfurnishtoensurestablepapermachineoperationandahighstandardofpaperquality・Thefollowingoperationsareusuallyinvolved.Pulping•Baledpulp(orotherfibrousrawmaterial)isdispersedintowatertoformaslushorslurry.Theoperationca

4、nbeeitherbatchorcontinuous・Refining(orBeating).Thefibersaresubjectedtomechanicalactiontodeveloptheiroptimalpapermakingpropertieswithrespecttotheproductbeingmade・Theoperationisusuallycontinuous,butsomenon-woodandspecialtypulparestilltreatedbatch-wise.UtilizationofWet-EndAdditives・Awidevarietyofm

5、ineralandchemicalagentsareaddedtothestock,eithertoimpartspecificpropertiestothepaperproductortofacilitatethepapermakingprocess.Preparationisusuallycarriedbutbatch-wise・MeteringandBlending・Thevariousfibrousandnon-fibrousfurnishcomponentsarecontinuouslycombinedandblendedtoformthepapermakingstock・

6、Additionaloperationsmaybecarriedoutaspanofstockpreparationdependingontheparticularsystemrequirements.Forexample.pulpscreeningandcleaningmaybenecessaryforsomehigh-qualityfurnishes・Itshouldbenotedthatthepapermachinewhitewaterandbrokehandlingsystemsaresometimesconsideredtobepartofstockpreparation.

7、However,itismoreappropriatetoconsiderthesesystemsinChapter16wheretheirfunctionandoperationareeasiertounderstandinthecontextofoverallpapermachineoperation・&1REPULPING(DISPERSION)Repulping(orpulping)referstoanymechanicalactionthatdi