第4章 纸页施胶

纸页施胶“Sizing”isthesheet’sresistancetoliquidpenetrationWhatis“Sizing”?Papermachinerunnabilitythroughsizepressand/orcoaterapplicationsToensureproperpick-up/hold-outofpapersurface-appliedadditivesPaperqualityrequirementsWhy“Size”?Inkpenetrationtest(HST,CST)Cobb“Dye”indicatortestssuchasStokigtBristowwheelWaterdropcontactangleOthergradespecific“tailored”testsOurcustomers’andtheircustomers’satisfactionHowis“Sizing”Measured?

“Sizing”canbemeasuredusinganumberofdifferentdryendtestinstruments,themostcommonare:1MinuteCobb

(ambienttempwater)20gsmtarget2MinuteCobb

(50Cwater)75gsmtarget3MinuteCobb

(ambienttempwater)50gsmmax

3MinuteCobb

(50Cwater)70gsmtarget

4MinuteCobb

(50Cwater)<80gsmtarget30MinuteCobb

(ambienttempwater)<100gsmCobbTests(forBoard)24HourimmersiontestforfishboxproductionBoilingwatersaturationandfloatingboattestsforgypsumboard(PBL)production1000+SecondsMinimum(typicalNorthAmericanstandardspecification)OneACCOSIZE-18MillRunsto2400+SecondsStandardOtherSizingTestsforBoardRosinSizeAlkyl

Ketene

Dimer

(AKD)Alkenyl

Succinic

Anhydride(ASA)FortifiedRosinSizeApplicationSoapSizeAddsizetostockatpH6.5orabove;thenaddalumtoachievelowpH(standardprocedure)AddalumtostocktoreducepH;thenaddsize(reverseprocedure)OptimumpH4.0-4.5~2.7partsalumto1partrosinsoapsizeDispersedRosinSizeAddalumatthesamepointasthesizeorbeforeKeeppHstockcontainingsizeaslowpHaspracticalDonothavesizeinstockwhichdoesnotcontainalumMuchlessalumrequiredforHi-pHasetypedispersedsizeproductsMorealumrequiredforNeuphor-typedispersedsizeproductsHydrophilic;cellulosereactiveketenegroup

HydrophobicNonpolargroupApplicationalkalinepH6.5orhigheraddedasfarbackasthemachinechestpumpoftenrequiresanalkalinitysourcesodaashorbicarbonateactsasacatalyststarchoftenaddedwithsizetypicallevel~5kgsolids/ton“pump&go”receivedinemulsionform(15%solids)ORR’OOHydrophobicAlkenylGroupHydrophilicCelluloseReactiveSuccinicGroupAlkenylSuccinicAnhydrideAccosize18

FinePaper&BoardAccosize100

SpecialtyGrades

AccosizeUltra

DevelopmentalASAproduct-FinePaperAccosizePlus

DevelopmentalASAproduct-BoardAlkylKeteneDimerResaleProductsAvailableCyanasize100Cyanasize500ACCOSIZE-18CationicStarchACEASAEmulsificationUnitAlkenyl

Succinic

Anhydride100%ActiveSolidsLiquidInfiniteShelfLife

NoControlledStorageEnvironmentNeededNonSheetSlipImpartingSizingAgentHighestRateofOn-MachineSizingDevelopment0.75-1.25kg/mTTypicalDosageLevelforFinePaperGradesMobile,ALandLongview,WAShippingPointsWhatisACCOSIZE-18?+OOOOOOIsomerizedOlefinMaleicAnhydrideAlkenylSuccinicAnhydride(ASA)ACCOSIZE-18EmulsificationAgentCationicchargehelpsretaintheASAonthefibersCationicstarchisanexcellentstabilizingagentMaintaininga4:1totalstarch:sizeratioorhigherwillhelpensureefficientACCOSIZE-18performanceCationicstarchpromotessizingefficiencyCationicstarchacceptedtodayastheemulsificationagentformostefficientACCOSIZE-18performanceACCOSIZE-18/CationicstarchemulsionaddedtothethinstockatapointofgoodmixingafterallmajorstockrecirculationAcceptedrolesASAalkalinepapermakingsystemASAemulsificationandsizeperformanceStrengthcontributionRetention/drainagecontributionEmulsionparticlesizeASAsizingpromoterWeightedAverageParticleSize-MicronsLargerSmallerLowerHigherInkPenetration,(Sec.)HST,(SECS)Starch:SizeRatioAmylopectinOHOHOCH2OHOHOHOCH2OHOHOHOCH2OHOHOCH2OHOOOHOHOCH2OHHOOOOOOOHOHOCH2OHOHOHOCH2OHOHOHOOHOHCH2OHOAmyloseOHOHCH2OHOHOHOCH2OHOHOHOOHOHOCH2OHCelluloseChainOOOCH2OHOOHONXStarchComponentsWhatarethePotentialASAReactions?2.1.OH+OOOCCOOHOOCelluloseASATheesterificationreactionsofASAwithcellulose.OOOASAH2OHydrolyzedASAThehydrolysisofASAOHCCOOHOBA,Dyes,andWetEndStarchoptionsBlendChestMachineChestRetentionAidOptionsACCOSIZEEmulsionOptionsHeadboxPressureScreenThinStockAlumorPACOptionsFanPump#1StuffboxSiloFanPump#2CleanersFillerOptionsACCOSIZE-18ASA(Oil-based)CationicStarch(starchinwatersolution)Whatis“Emulsification”?

“Forcingtwootherwiseincompatiblefluidstogetherinastablesuspension.Reliable,stream-linedpackagesMetersACCOSIZE-18ASAMetersCationicStarchOperatingModesLocalRemoteDCSinterfaceandoperationSeparatesetpointinputsACEASAEmulsificationUnitAutomaticallycontrolledstarch:sizeratioACCOSIZE-18emulsionfeddirectlyfromtheunitdischargetothestocksystemadditionpointPrecisecontrolovertheemulsificationprocessandemulsificationparametersmoreclearlyunderstoodApproximately200ACEASAunitsincommercialoperationgloballyACEASAEmulsificationUnitTheACEASAEmulsificationUnitACEEmulsificationUnitACCOSIZE-181ºStarchACCOSIZE-18Emulsionfeddirectlytothethinstocksystem2ºStarchACEEmulsificationUnitSet-upOnePaperMachineACEEmulsificationUnitACCOSIZE-18Cationic