《干网知识培训》PPT课件.ppt

ByWernerThommenProductmanagerdryersAndyZhouTechnicalservice,DryerFabrics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BelgiumCzechRepublicAsia:亚洲China中国AstenJohnsonsalesofficeSingapore,Typesofyarnsandmaterials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&SingleTiersectionsImprovesheat&masstransfer(提高热与质量传递)bettersheetcontactondryercan,SomeDefinitions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,Yarndegradationcausedbyacombinationofhighheatandmoisturebothheat&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,DryerFabricRequirements,Achieveareasonablelifetime.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,ContactArea,MonoTier,BalancedWeave,SameContactareaasfabricExceptionalStrengthNon-marking,MonoTierConcept:PinSeam,Fabricstrengthcomparison,Pinseam,ProductManagement18.10.2006,MonoTier,StreamlineCoilSeam,SeamDesigns接缝设计,Spiralfabric,ExtrafineSpiraldesignForhighspeedmachinesForsingletier,UnoRunandconventionalpositionsLowcaliper1.6mmHighcontactarea30%EasytocleanPermsteps110-150-200-250cfm,Bi-coloredseamspiral,SpiralFine,TheMonoTIeradvantageof2independentwarpsystems,Abrasion,FABRICINSTALLATION网的安装,INSTALLINGNEWFABRICWITHOLDFABRIC用旧网安装新网,USINGLEAD-ONHARNESS,TYINGGUIDEPADDLE,FabricInstallation,Theimportantsteps:重要步骤,EnsureallIsolationsareinplace隔离装置到位Centertheguideroll导向居中Secureguidepalm安全Alignfabric调整.,FabricInstallation,Theimportantsteps(contd):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.Increasegraduallywhenthefabricrunsstraight,FabricTension张力,Advantages:优点Improvesdryingefficiencybysqueezingairoutbetweenthewebandthedryer.Forcespaperintocloseandconstantcontactwithsteamheatedcylindersincreasingheattransfer.Machinespeedcanbeincreased,steamconsumptiondecreasedresultinginreducedoperatingcosts.,FabricTension,Disadvantages:缺点Shortenedfabriclifedueto:Wearfrompittedrolls,overstretching&weakeningBearingwear&driveloadincrease.Rolldeflection:fabricdistortion,CMDpermeabilityvariation.speedvariationbetweencenterandedges.Sheetmarksfromfabricweavepattern.,Recommended:推荐34kN/monnewmachinesFollowmanufacturersspecifications,FabricTension,FabricCleaning网的清洁,Showertypes冲淋方式Lowpressurechemicalshower.rollsideoffabric,intonipoffirstreturnroll.Lowpressurerinseshower.papersideoffabric,endofreturnrun.HPcleaning/rinsingshower.papersideoffabric,perpendiculartofabric.endofreturnrun.,FabricCleaning,CleaningProcedure: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,FabricCleaning,Advantages:优点Consistentdryerperformance.网的可靠性Improvedsheetprofile.提高纸张质量Betterpocketventilation.Betterfabriclife.延长使用寿命Reducedsteamusage.降低蒸汽用量Lowerenergycost.降低能源成本,ChangeinPermeability透气性的改变,FabricCleaning,Thereisnoquickandeasyanswertothisquestion,dryerfabricsshouldbeinspectedatregularintervals,both:这里没有直接的回答,干网需要经常性的定期检查:DuringShuts,and关机时和WhileRunning运转时,FabricInspection/Removal网的检查/取下,DuringShuts关机时,FabricInspection检查,Shutdown:关机时Inspectedges检查两边Inspectseam检查接缝Inspectguidingaction检查导向Inspectstretchroll检查张力辊Inspectfabricbodyfortears,cuts,etc.检查网面磨损等,RegularFabricEvaluations网的评估,Edgeravelling/damage:边的损坏Excessiveguidepaddleforce过大的导向翼的拉力Fabricrubbingagainstobject(s)网与物体的摩擦,Regul