Valmet Symflo D Headbox, 8.4 Meter – SOLD!

DimensioningofHeadboxFlows Slicewidth8220mm323.6in Wirewidth8400mm331in DesignSpeed1524m/min5000ft/min Sliceflow1644l/s200l/s/m 26080gal/min80gal/min/in Papergradesandfurnish Papergrades LWC Basisweightrange/(basesheet) min.37g/m2(25lbs/3300sq.ft.) max.52g/m2(35lbs/3300sq.ft.) Mostcommonbasisweight(basesheet) 39.2g/m2(26.5lbs/3300sqft) Basisweightrange/(coated) min.53g/m2(36lbs/3300sq.ft.) max.74g/m2(50lbs/3300sq.ft.) Mostcommonbasisweight(coated) 59g/m2(40lbs/3300sqft) Numberofcoatinglayers 1pce/side Furnishcomposition(max/min)in bone-drypaper TMP52% KRAFT48% DIMENSIONINGBASIS Theheadboxisdimensionedmechanicallyforthepressurecorrespondingtothe processdesignspeedofthemachine,1219m/min(4000fpm). Theinletpiping,equalizingchamberandturbulencegeneratoraredimensioned accordingtothesliceflow. INLETPIPING One-sidedstockinletwithtubebank;inletheaderrecirculationmaximum10%ofthe sliceflow. Design(Drawings)forthe"transitionpipe"toreplaceexistingattenuatorisincluded. PipebyWeyco OVERFLOWFROMATTENUATOR Maximum3%ofthesliceflow. HEADBOXDESIGNANDMATERIALS GENERALDESIGN Theheadboxconsistsoftheinletpiping,equalizingchamber,turbulencegeneratorand slicesectionassembledbyboltedjoints. AllsurfacesincontactwithstockareofstainlesssteelSS2343(AISI316L-type).The supportstructuresareofsteel.Toeliminatesoiling,thesurfacesincontactwithstock areelectropolishedormachinedbyabrasiveflow. GabFormerconvertible(4/6) INLETPIPING Thestockisdistributedthroughaone-sidedinletheaderandtubebank.Atoneendof theinletheader,aprovisionhasbeenmadefor10%recirculation,whichenablesthe balancingofpressureintheheader.Theheaderisequippedwithinspectionopenings andasightglassforadjustingtherecirculation. BASISWEIGHTPROFILEWITHDILUTIONWATER EQUALIZINGCHAMBER Anequalizingchamberissituatedbetweenthetubebankandtheturbulencegenerator forequalizingtheflowfromtheinletheader.Theequalizingchamberhashingeddoors atbothends. ATTENUATINGTANK Theequalizingchamberopenstoanoverflowthresholdwhichisdesignedtodampen thepressurepulsationsinthestockflow.Theoverflowthresholdisconnectedtoan attenuationtank.Thestockflowingoverthisthresholdisdischargedthroughbothends ofthechamber.Theairvolumeattheattenuatorisoptimizedtodampenpulsationwhich isharmfulforpapermakingprocess.Themeasuringsensoroftheoverflowsurface levelisincludedinthedelivery. Theattenuatingtankontheheadboxisdesignedsothatitcanbepluggedtoallowthe headboxutilizeinfuturegapformer. TURBULENCEGENERATOR Togenerateasuitablemicroturbulence,aturbulencegeneratorofstainlesssteelis placedbetweentheequalizingchamberandslicesection.Itiscomposedofaperforated plateandatubebankattachedtoit.Onbothsidesoftheturbulencegenerator,thereare channelsforfeedingadditionalstock.Theflowinthesechannelsiscontrolledbyan adjustableremotecontrolvalve.Theedgeflowchannelsareequippedwithmagnetic flowmeters. SLICESECTION Theapronisaboxbeamfixedwithscrews.Thebottomsurfaceoftheaproniskept cleanbyawatershower.Theshowerpipeisincludedinthedelivery. Thetopsliceisaboxbeamadjustablebyelectromechanicmechanisms.Bothendsare equippedwithaconnectionforpressuremeasurement.Apressuretransmitteratthe backsideisincludedinthedelivery.Thefrontsideconnectionisprovidedforthe customer'spressuretransmitter.Bothendsoftheslicesectionarefittedwithdoorsthat canbeopenedforcleaning.