Status and opportunities of China's curved surface printing industry

2019-08-29

1.Excessiverelianceonmanualoperations Curvedsurfaceprintingdependsonmanualoperationsinchromaticity,pressureadjustment,feeding,samplingandotherlinks.Intheinorganiclongtime,theprintingmachineisbasicallyinaparalyzedstate.Intheabsenceoftemplatesandfollow-up,thecaptainoftheprintingpressadjuststheamountofinkaccordingtohispreferencesandexperience.Thequalityoftheprintislargelydeterminedbythelevelofthecaptain.Evenifsomepilotshaveexperience,duetoacademicqualifications,visionandotherconstraints,theprofessionalknowledgeisnarrowandthetechnologyupdateisslow.Professionalhigh-skilledprintersarehardtofind. 2.Theinksuppliesarecomplicatedtomatch,andtheprintingqualityandcostaredifficulttocontrol Thedensity,fineness,viscosity,fluidity,saturation,waterresistance,acidandalkaliresistanceofdifferentinksarealsodifferent.Itisproportionedwiththethinner,matchedwiththepropertiesofthematerial,withpigments,linkingmaterials,fillersTheratioofadditionalmaterialsisever-changing.Thedifficultyingraspingthisvariabilityhascausedseriouswasteofconsumablessuchasinkandblankets,whichhasgreatlyincreasedprintingcosts.Mostoftheinksonthemarkettodayhaveaviscosityof13TV,whilecurvedprintingonlyrequiresaviscosityof18TV.Thisspecialinkwithoutcurvedprintingislikelytocauseblurredprintedimages,differentinkcolors,andbubblesorindentationsonprintedstripesWaitforqualityproblems. 3.Occupationaldiseasesarefrequentandthelossofskilledworkersisserious High-frequencycontactwithinkintheprintingindustry,harmfulgasessuchasalcoholcompounds,formaldehyde,phenolandotherorganicsolventsintheinkenterthebodythroughtherespiratorytractandskinofworkers,causingavarietyofrespiratorydiseasesandoccupationalpoisoning.Ultravioletraysreleasedbythecuringsystemduringthestart-upprocesscanirritatethehumaneye,andlong-termexposuremaycausedamagetotheeyemembraneandlossofvision.Therefore,itisnoteasyforprintingworkerstoworkformorethanfiveyears.Highoccupationalhazardsallowprintingtechnicianstochooseshort-termjobsorsimplyswitchcareers,causingseriousbraindrainanddifficultrecruitmentproblemsforenterprises. 4.LowproductionefficiencyTheequipmentstructurelacksprofessionalcustomization Consumablewasteisserious,manualoperationisslow,andhighdefectiverateleadstolowproductionefficiency.Theequipmentstructureofthecurvedprintingmachineisextensive,andthereisnoone-to-onecreativedesignoftheequipmentstructureforcertaintypesofprintedproducts.Whenprinting,theprintedproductsneedtoaccommodatetheequipment. 5.Restrictedbyinternationalmonopoly,high-qualitycurvedprintingequipmentisexpensivetoproduce FlexographicprintinghasdevelopedtoamaturestageinEuropeanandAmericancountries,andChina'sflexographicprintinghasonlystartedinrecentyears.Therefore,China'sflexographicprintingmaterialsandplate-makingequipmentrelyheavilyonimports,highpricesandmonopolyafter-salesserviceToacertainextent,itrestrictsthepopularizationandpromotionofflexoprintingintheChinesemarket. 6.IncreasednationalsupervisionandcontrolThecurvedprintingindustryfacesstricterregulations In2010,theprintingindustrywasincludedinthescopeof"developingpreventionandcontrolofvolatileorganiccompoundpollution",andrelevantfunctionaldepartmentsimplementedstricterstandardsonthepartsoftheprintingprocessthatdidnotmeetenvironmentalprotectionrequirements.Inparticular,basedonthe"TenWaters"and"AtmosphereTens",wefocusedonthesupervisionofwaterandvolatileorganiccompoundpollutiontreatment.VOCssewagechargesarepushingtheprintingenvironmentgovernancetoasubstantialnewstage,andthedevelopmentofQuyinisfacingstricterregulations. 7.High-qualitycurvedsurfaceprinting Thedevelopmentoftraditionalcurvedsurfaceprintinghasmatured,andtheemerginggreenprintingflexoprintingisjustbeginning.China'smusicprintingindustryalreadyhastheabilitytomeetthediversifiedandcomprehensiveneedsoftheinternationalmarket.Inthenextthreeyears,thedemandfordomesticflexographicprintingmachineswillexpandrapidly.Inadditiontothedemandforinkaccessories,China'soverallflexographicprintingequipmentwillexceed100millioninmarketdemand.Chinawillbecomeaveritableandimportantglobalmanufacturingbaseforflexographicprintingmachines. Esko'sone-stopcurvedprintingsolutionallowsyoutohaveaperfectprintedproduct ExclusivecustomizedintelligentequipmentReducemanpowerdependenceandgreatlyincreaseproductioncapacity ExclusivecustomizedintelligentequipmentReducemanpowerdependenceandgreatlyincreaseproductioncapacity 1.Automaticfeeding,automaticflameorcoronasurfacetreatment 2.Intelligentonlinedetection.Whenthereisnoprintedproductormultipleprintedproducts,theprintingcylinderisautomaticallyseparatedandthealarmisstoppedtodetect 3.Intelligentvisualinspectiontoremoveunqualifiedprints 4.Automaticinksupplydevice 5.Automaticcleaningofcolorstationandinkset Multipleprintinglinkshavereplacedmanualoperationswithmachinestoachievethelowestmanualdependenceandreducedowntime,whichnotonlyimprovesproductquality,greatlyimprovesproductionefficiency,butalsominimizesoccupationalhazards.Eskocanalsocustomizeitsownhigh-qualitycurvedprintingmachineaccordingtothedifferentneedsofcustomers. Professionalinksup

Common problems and methods of printing

2019-08-29

1.Pooradhesionofinkonsubstrate 1.1Wettingofinkadhesionmechanism:Theadhesionfastnessistheresultoftheinteractionbetweentheprintingsubstratefilmandtheinkbindermaterial.Compatibility:Theconnectionmaterialoftheinkandthebasematerialhavesimilarpolaritiesandgoodcompatibility.(Besuretoselecttheinkthatmatchestheprintedmatter). 1.2Reasonsforpooradhesionandcountermeasuresforbasematerialfactors.  a.Thecoronatreatmentdegreeonthesurfaceofthesubstrateisnotenough,therequiredtensionisnotreached,orthetreatedsubstratesurfacehasapoorstorageenvironmentandthestoragetimeistoolong,causingthesurfacetensiontodecayandfail.Generally,thesurfacetensionofPPandPE≧38mN/m,PET≧50mN/m,NY≧52mN/m.Checkthesurfacetensionofeachbatchofmembranesbeforeuse. b.Duringtheprocessing,mostofthebasematerialsareaddedwithcertainlubricants,antistaticagents,moisture-proofagents,etc.Theseadditivesslowlypenetrateintothesurfacefromthefilmovertime,formingaweakinterfacelayeronthesurfaceofthefilm,affectingtheinkAdhesion.Therefore,thefilmshouldbeusedwithinthevalidityperiod,andthesurfacetensionshouldbecheckedbeforeuse.AvailableDynepentest.SubstratefactorThefactorofsubstratemoistureabsorption.Forexample,PA,PVA,PTandothermaterialsareeasytoabsorbmoistureandreduceadhesion.Suchsubstratesshouldbestoredundergoodconditions(temperatureandhumiditycontrol)andfullypreheatedbeforeuse.Thewrongtypeofinkisused,anddifferenttypesofinkaremixed.Therearemanytypesofinkforgravureprinting,includingsurfaceprintingandbackprintinginks.Differentmaterialscorrespondtodifferentinks.Variousspecialinksmustbeusedcorrespondingly,otherwisetheadhesionfastnessisnotenough,andtheoperationprocessinstructionsshouldbecheckedbeforeproduction.Inkwhitening.Deteriorationandwhiteningoftheinkgreatlyreducetheadhesion.Inkdryingisinsufficient.Insufficientdrying,therearemanyresidualsolventsinside,inaddition,acertaindryingtemperatureisextremelybeneficialtoimprovetheadhesionofsomeresinbinders. 2.OverprinterrorOverprinterrorsaremostlycommondefectsinprinting.Thephenomenonisthatduringthemulti-coloroverprintprocess,eachcolorcannotcompletelyoverlap,andthereisacertaindeviation. 2.1PersonnelqualityBecausethecolorregistrationerrorexistsobjectively,itrequiresemployeestohaveextremelystrongworkability.Printingisameticulousjob,whichmustbedonewithcare,careandresponsibility.Self-inspectionandself-inspectionshouldbedoneduringwork,andobservationsshouldbemadebymultiplepartiestofindproblemsintime. 2.2EquipmentfactorsTheaccuracyandperformanceoftheentireequipment,thetensioncontroloftheoverprint,theheatingairsupplysystem,thecooperationoftheimprintingrubberroller,plateroller,plateshaft,guiderollerandothersystems,theseconditionsdeterminethetemperature,pressure,parallelismduringoverprintingDegree,elongation,winding,etc.,andthecolorregistrationsystemitselflimitsitsaccuracy.Registeredphotoelectricdevicesshouldbemaintainedandoperatedcorrectly.Forexample,ifthelightsourceofthehalogenlightsourceisweak,theopticalfiberorhalogenbulbshouldbereplaced,andthedistancebetweenthereflectorandthescanningheadisadjustedcorrectly,generallyabout8mm.Theincreaseoftheplaterollerisnotsuitable,anditiseasytoproducelongitudinalcolorregistrationinaccuracy,therubberoftheimpressionrollerisdeformed,andtheelasticityisinsufficient.Keepthepressurerolleringoodcondition. 2.3OperationprocessThetensionsettingofthesubstrateisunreasonable,thetensionistoosmall,thesubstrateisslack,andthecolorregistrationintheverticalandhorizontaldirectionsisnotaccurate;ifthetensionistoolarge,thesubstrateshrinkslaterallyandthecolorregistrationintheverticaldirectionisunstable,andadjustthetensionaccordingly.Thetemperatureisnotsuitable,especiallyifthetemperatureoftheovenistoohigh,andthetemperatureofthecoolingrolleristoohightodeformthefilm.Forafilmthatisnotflat,thetemperatureofthepreheatingboxshouldbeappropriatelyincreased.Theintakeandexhaustairflowintheovenisunbalanced,whichcausesthefilmtoshakeintheoven.Theanemometershouldbeusedtomeasuretheintakeandexhaustairflowandcontrolit.Theplaterollerisnotinstalledproperly.Ifeccentricityoccurs,theinkontheplugmustbewipedcleanbeforetheplaterollerisinstalled. 3.1Causesofscraperlinemarks①Noinklinemarks.Themainreasonisthattheinkismixedwithhardinorganicimpurities,suchassand,etc.Thesehardparticlesareembeddedinthebladeedgeofthescraperandcauselinemarks.Sometimessuchscraperlinemarksarealsodashedlines,andtheappearanceofsuchscraperlinemarkscaneasilydamagetheprintingandthescraper.

[Knowledge sharing] How to eliminate offset ghosts?

2019-08-29

Duringtheoffsetprintingprocess,the"phantom"failurethatappearsonthecontinuouslyprintedproductsiscalled"ghosting".Intheactualproductionprocess,therearemanyfactorsthatleadtotheappearanceof"ghostimages". 1.Typesof"ghost" Ingeneral,"ghost"canbedividedintomechanical"ghost"andcraft"ghost".Themechanical"ghostimage"iscausedbymechanicalaction,whichismainlyaffectedbyprintingpressure,inkroller,printingplateandotherfactors.Theprocess"ghostimage"isduetothechemicalchangeoftheinkduringtheprintingprocess.Such"ghostimage"isgreatlyaffectedbytheproductionenvironment. Accordingtothepositiveandnegativeimagesofprintedpictures,"ghostimages"canbedividedintopositiveimages"ghostimages"andnegativeimages"ghostimages".Thedarkerpartofthepatternoftheprintedproductiscalledthepositiveimage,andtheextensioninthecircumferentialdirectionformsa"shadow"thatislighterincolorthanthenormalimage,whichiscalledthe"ghostimage"ofthepositiveimage,asshowninFigure1a;Thelighterpartofthepatternoftheproductitselfiscalledthenegativeimage,andthe"shadow"thatisdarkerincolorthanthenegativeimageformedbytheextensioninthecircumferentialdirectionistheso-callednegativeimage"ghostimage". 2.Theformationconditionsof"ghost" Theunreasonablelayoutdesignorimproperadjustmentoftheprintingpressduringoffsetprintingisthemainreasonfortheappearanceof"ghostimages"intheprintedproducts,specifically: ①Thereisapatternortextwithalargeamountofinkrequiredattheheadoftheprintingplate; ②Thereisapatternwithlargeinkdemandandlargeareaatthetailoftheprintingplate; ③Thedistancebetweenthepatternportionintheheadandtaildirectionoftheprintingplateandthesolidportionisjustamultiplerelationshipwiththediameteroftheinkingroller.  Offset"ghost"isakindofavoidablefailure,whichfocusesonpreventionandavoidssuchfailures. ISGOhasanexperiencedteamofprofessionaldesigners.Designerswilldesignasuitableandpersonalizedproductimageaccordingtothedifferentmaterials,structuraldifferences,shapecharacteristics,andsizerequirementsoftheprintedproductsincombinationwiththecustomer'sbrandculture.Whendesigningandtypesetting,thelayoutshouldberationallydesigned.Theproperlayoutarrangementcanensurethatthegrindingrollerhassufficientinkingtimetobalancetheinkamountoftheentirepage,andtechnicallyreducetheappearanceofghosts. Ofcourse,youcanalsostartfromthefollowingaspectstoavoidtheappearanceof"ghost": (1)Adjusttheamountofinksupplycorrespondingtothe"ghost"area. (2)Increasetheamountoftandemrollertandem.Iftheinkrollerintheinksupplysystemcannotguaranteetheuniformityoftheinklayerontheinkroller,"ghosting"willalsooccur.Therefore,itispossibletoincreasethemomentumoftheinkingrollertoavoidtheappearanceof"ghosting". (3)Adjustthepressure.Inordertoavoidsuch"ghosting",theoperatorshouldadjustthepressurebetweentheinkrollersintheinksupplysystemtothebeststate. (4)Checkwhethertheblanketistight,theplateistight,andtherollergearisworn.  Fordetails,pleasecallforconsultationandtechnicaldiscussion.EskoTechnology,aprofessionalone-stopcurvedprintingservice,solvesprintingproblemsforyou,sothatyouhaveaperfectprintedproduct.