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PapermakingTheprocessofgoingfromPulptoPaperObjectivesOfPapermakingGoodFormationPhysicalandOpticalPropertiesFHighCapacity(tonspaper/day)PapermakingWettoDTyStockPreparation(Wet-end)-Refining,Screens,Cleaners,ChemicalAdditivesPapernachinie-Headbox,FormingSection,PressSection,Dryers,SizePress,PaperReelDryEnd一Coating,Calendaring,Rewinding,PackagingWet-EndOperations+_。ckStock7Huppe8tok河RefiningPurposeofRefining一Collapsefiberstoimprovebonding-Fibrillates(shredsfibers)toimprovebonding口一NativeshapeRefiningDelamination41ubbe人microfibrilsRefiningPeune138PhoemieegphsolnsofwoodpgbelonandsferefnngcounesyofinsttuteaPaperScenceandTechnolgylPressureScreensRemovelargecontaminants一Plastics一Metals一RocksCentrifugalCleanersUsecentrifugalforcetoremovecontaminantsRemovesparticlesthatarelighterorheavierthanpulp一Plastics-DirtChemicalPaperAdditivesAcidsandBases一ControlpHSizingAgents一Rosin,waxes,AKD一UsedforpapergradesrequiringwaterrepellencyorcontrolledrateofwaterabsorptionDryStrengthAddiitivyes一Starchandotherpolymers一UsedtoimprovestrengthandstiffnessofpaperWetStrengthAdditives一Polymersthatcrosslinktofibersurfaces一UsedforpapergradessuchastowelingChemicalPaperAdditivesFillers-Clay,talc,TiO,(titaniumdioxide)一Improvesopticalandsurfacepropertiesforprinting&gradepapersRetentionAids一PolymersthatimproveretentionoffiberfinesandfillersDefoamers一ImprovewaterdrainageandsheetformationSlimicides一Controlsslimegrowthandothermicroorganismsinpapermachinewhitewater