Lesson 1Brownstock washing principles: dilution, displacement, an counter-current washingCovers dilution an displacement mechanisms, shower an drum operation, an counter-current layouts. Emphasizes washing efficiency, soda loss, filtrate reuse, an impacts pon evaporators, recovery boiler, an downstream fiber quality, seen?
Dilution an displacement washing mechanismsWashing factor, dilution factor, an soda lossWasher types: drum, DD, pressure, an beltFiltrate segregation an counter-current circuitsEffects pon evaporators an recovery boiler loadImpacts pon bleaching chemistry an fiber qualityLesson 2Drying section basics: dryer cylinder operation, temperature profiles, runnability factors, an reel windingExplains dryer cylinder operation, steam an condensate systems, an hood ventilation. Covers temperature profiles, pocket ventilation, sheet draws, an runnability, ending wid reel winding principles, tension control, an roll structure, yuh know.
Steam groups, condensate removal, an siphonsCylinder surface temperature an heat transferPocket ventilation an humidity managementSheet draws, threading, an runnability limitsDryness profiles an curl or cockle controlReel winding tension, nip, an hardnessLesson 3Bleaching sequences fi wood-free papers: typical chemical stages an objectivesDetails common bleaching sequences fi wood-free grades, including oxygen, peroxide, an chlorine-free stages. Explains stage objectives, selectivity, brightness targets, chemical interactions, an impacts pon strength, dirt, an environmental load, mi bredda.
Typical ECF an TCF sequences fi wood-free pulpStage objectives: O, D, E, P, an peroxide stagesBrightness development an reversion controlChemical selectivity an fiber strength retentionCarryover limits from washing to bleachingEnvironmental an effluent considerationsLesson 4Overview of kraft pulping an brownstock composition an contaminantsExplains kraft brownstock composition, residual lignin, extractives, an entrained black liquor. Covers contaminants, shives, metals, an carryover dat influence washing efficiency, bleaching cost, sheet defects, an recovery load, yuh zeet.
Kraft cooking reactions an delignification profileTypical brownstock kappa, viscosity, an brightnessOrganic an inorganic contaminants in brownstockImpact of shives an knots pon downstream operationsCarryover to washing, bleaching, an recoveryLesson 5Stock preparation: screening, cleaning, blend control (hardwood/softwood) an consistency managementDescribes screening, cleaning, refining interface, an hardwood–softwood blending. Focuses pon consistency control, contaminant removal, fiber fractionation, an how stock prep settings influence formation, strength, an runnability pon di machine, seen.
Coarse an fine screening efficiency targetsCentricleaners an removal of heavy contaminantsHardwood an softwood blend strategiesConsistency control loops an instrumentationRefining location relative to screening stagesEffects pon formation, strength, an defectsLesson 6Mass an energy balances cross di fiber line: yield, solids flow, steam an condensate flowsDevelops mass an energy balances cross di fiber line, from brownstock to reel. Includes yield, solids an liquor flows, steam an condensate circuits, an how balances support troubleshooting, optimization, an cost tracking, mi fren.
Defining system boundaries an process mappingFiber yield, rejects, an loss accountingSolids, liquor, an filtrate flow balancesSteam, condensate, an heat recovery loopsUsing balances fi troubleshooting an auditsLinking balances to cost an KPI trackingLesson 7Approach flow systems: save-alls, blending chest, screens, an chemical additionsExplores approach flow layout from machine chest to headbox. Covers mixing an blending chests, screens, cleaners, save-alls, an chemical addition points, emphasizing stability, basis weight control, an short-circulation cleanliness, yuh know.
Machine chest, mixing chest, an level controlFan pump function an pressure stabilityApproach flow screening an cleaning stagesSave-all systems an white water recoveryChemical addition strategy an timingBasis weight an dilution control systemsLesson 8Interdependencies: how changes in washing, bleaching, refining, or forming affect downstream moisture, strength an steam demandShows how washing, bleaching, refining, forming, pressing, an drying interact. Emphasizes how upstream changes shift moisture, strength, porosity, an steam demand, an how to diagnose root causes using cross-section data, seen.
Washing carryover effects pon bleaching an dryingRefining impacts pon drainage, strength, an energyForming quality versus pressing an drying limitsPress dryness an downstream steam consumptionBleaching an strength tradeoffs in final sheetSystematic root cause analysis cross di lineLesson 9Forming section basics: headbox hydraulics, slice setting, jet-to-wire ratio, an forming fabricsIntroduces headbox hydraulics, slice opening, an jet-to-wire ratio. Explains turbulence generation, fiber orientation, forming fabric design, an drainage elements, linking settings to formation, CD profiles, an two-sidedness, mi bredda.
Headbox types: open, hydraulic, an dilutionHeadbox consistency an turbulence intensitySlice opening, lip profile, an CD controlJet-to-wire ratio an fiber orientation effectsForming fabric design an conditioningDrainage elements an vacuum box settingsLesson 10Pressing an consolidation: nip types, press loading, press felts an water removal mechanismsCovers press nip types, loading strategies, an press felt design. Explains water removal mechanisms, nip dwell time, void volume, an rewet, an how pressing influences dryness, bulk, strength, an steam demand in di dryer section, yuh zeet.
Single, double, an shoe press configurationsPress loading, line pressure, an nip dwell timePress felts, void volume, an conditioningMechanisms of water removal an rewetPress dryness versus bulk an strength tradeoffsImpacts pon dryer steam demand an runnability
