干网知识培训

ByWernerThommenProductmanagerdryersAndyZhouTechnicalserviceDryerFabrics干网Typesofyarnsandmaterials(原材料种类)Dryendoperation,(干燥工艺)Definitions(定义)DryerFabricRequirements,(干网要求)Designs&Features(设计与特性)Installation,Tension&Guiding(安装,张力与定位)Summary&Questions(总结和问题)DryerFabricCourseOutline提纲Australia(澳大利亚)Bangladesh(孟加拉国)China(中国)India(印度)Indonesia(印尼)Japan(日本)Korea(韩国)Malaysia(马来西亚)NewZealand(新西兰)Pakistan(巴基斯坦)Philippines(菲律宾)Taiwan(台湾)Thailand(泰国)Vietnam(越南)Locations:位置NorthAmerica:北美USA:7plants美国:7个工厂Canada:3plants加拿大:3个工厂BelgiumCzechRepublicAsia:亚洲China中国AstenJohnsonsalesofficeSingaporeTypesofyarnsandmaterials原材料种类YarnTypes线的种类SpunYarn细纱Monofilament单丝–RoundMonofilament圆形单丝–ShapedMonofilament其他形状单丝RegularRoundMonofilament常用圆形单丝ShapedMonofilament其他形状单丝RibbonShapedMonofilament带状单丝YarnMaterials线的材料Polyester聚脂Polyamides聚酰胺PPS抗磨损聚脂PEEK耐高温聚脂Polyester聚脂–KeyProperties:主要特性Excellentdimensionalstability尺寸稳定Excellenttensilestrength良好的抗张强度Excellentresistancetoabrasion良好的抗磨损性Chemicallyresistanttoacids耐酸性Fairresistancetoalkalis抗碱性Moderateresistancetohydrolysis中等耐水解性DRY-ENDOPERATION干燥工艺FunctionsofaDryerFabric干网的功能Supportssheetthroughdryersection(纸张的支撑)–fullsupportthroughUno-run&SingleTiersectionsImprovesheat&masstransfer(提高热与质量传递)–bettersheetcontactondryercanSomeDefinitions定义Definition:定义Volumeofairperunitareathatpassesthroughafabricunderapressuredifferentialof1/2”ofwatercolumn.在1/2”水柱压力差异下通过网的空气数量单位.Permeability透气性HydrolysisDefinition水解Adoubledecompositionreactioninvolvingtheadditionoftheelementsofwaterandtheformationofanacidandabase,anacidandanalcohol,oranacidandphenol,resultinginmajortensileloss.一种包含了水分子的酸合物,或酸和酒精,或酸和苯酚的复分解反应,其结果是伸长性的丢失.Hydrolysis水解Yarndegradationcausedbyacombinationofhighheatandmoisture–bothheat&moisturemustbepresent.(水解导致线的退化是由高温与湿气引起)Fabricgets“rotten”usuallystartingontheedges.(网的腐化往往是从边上开始)Mustbedimensionallystable.尺寸稳定Providegoodrunnability提供良好的运转性Musthaveasmoothsurfaceandseam光滑的表面和接缝Mustbeofadequatestrength足够的拉力Contaminationresistantandeasycleaning抗污及易清洁Haveanevenperm-profile透气性的一致性DryerFabricRequirements干网要求DryerFabricRequirementsHavetherightair-permeability正确的透气值Air-perminrelationwith:透气性与以下相关-Dryingcapacity干燥能力-Sheetstability纸张稳定性DryerFabricRequirementsAchieveareasonablelifetime.达到合理的寿命Factorsaffectingthelifetime:影响寿命的因素Contamination(污染)Hydrolysis(水解)Chemicaldegradation(化学退化)Abrasion(磨损)DryerFabricDesigns&Features设计与特性MonoTierConcept:FeaturesandBenefitsMonoTier概念:特性与优点FloatWeaveConventionalMonoTier1525500102030405060ConventionalBalancedWeaveConventionalWarpFloatWeaveMonoTierWeavePercentContactContactAreaMonoTierBalancedWeaveSameContactareaasfabricExceptionalStrengthNon-markingMonoTierConcept:PinSeamFabricstrengthcomparison92012001900220005001000150020002500daN/10cm1conventionalflatyarn1conventionalflatyarn2MonoTierIIRMonoTierIIIRPinseamProductManagement18.10.2006MonoTierStreamlineCoilSeamSeamDesigns接缝设计SpiralfabricExtrafineSpiraldesignForhighspeedmachinesForsingletier,UnoRunandconventionalpositionsLowcaliper1.6mmHighcontactarea30%EasytocleanPermsteps110-150-200-250cfmBi-coloredseamspiralSpiralFineTheMonoTIeradvantageof2independentwarpsystemsAbrasionFABRICINSTALLATION网的安装INSTALLINGNEWFABRICWITHOLDFABRIC用旧网安装新网USINGLEAD-ONHARNESSTYINGGUIDEPADDLEFabricInstallationTheimportantsteps:重要步骤1.EnsureallIsolationsareinplace隔离装置到位2.Centertheguideroll导向居中3.Secureguidepalm安全4.Alignfabric调整5.…..FabricInstallationTheimportantsteps(cont’d):6.Seaming接缝Startatguidepalmside.从导向端开始AlignMarks调整标记Passthepintletroughtheseamchannel.穿连接线UsetheSeamingassisttominimizetension用接缝辅助使张力最小化Whenpullingthewire,doitslowlytoavoidfrictionheat.慢拉以防止摩擦热量的产生Finishbothendsasdemonstrated.7.BringFabricuptoTensionGradually慢慢加大张力Anewfabricshouldstartwithlowtension(say1.0kN/m)inordertoalignitonthemachine.IncreasegraduallywhenthefabricrunsstraightFabricTension张力Advantages:优点Improvesdryingefficiencybysqueezingairoutbetweenthewebandthedryer.Forcespaperintocloseandconstantcontactwithsteamheatedcylindersincreasingheattransfer.Machinespeedcanbeincreased,steamconsumptiondecreasedresultinginreducedoperatingcosts.FabricTensionDisadvantages:缺点Shortenedfabriclifedueto:–Wearfrompittedrolls,overstretching&weakeningBearingwear&driveloadincrease.Rolldeflection:–fabricdistortion,CMDpermeabilityvariation.–speedvariationbetweencenterandedges.Sheetmarksfromfabricweavepattern.Recommended:推荐3–4kN/monnewmachinesFollowmanufacturersspecificationsFabricTensionDRYINGCAPACITYVSFELTTENSIONFeltTension(pli)%ChangeFabricCleaning网的清洁Showertypes冲淋方式Lowpressurechemicalshower.–rollsideoffabric,intonipoffirstreturnroll.Lowpressurerinseshower.–papersideoffabric,endofreturnrun.HPcleaning/rinsingshower.–papersideoffabric,perpendiculartofabric.–endofreturnrun.FabricCleaningCleaningProcedure:清洁步骤Ensurecansarecooledtoavoidthermalshock.确保已经冷却Crawlspeed.爬行速度Warmwateronshowers.喷淋水升温Dilutecleaningsolution.稀释清洁剂Keepfabricswet.使网湿润Followrecommendedcleaningtime.根据建议清洁时间Thoroughlyrinsefabricwithfreshwater.用清水彻底冲洗网面FabricCleaningAdv