Processintroduction
Itisbasedoncommercialpaperprintingrequirementsandcanprintmultiplecolorsatonce.Themaincolororbackgroundofthepatterniscomposedofdifferentcolors,butthecolorchangeoflinesorimagesisgraduallytransitioned,withoutobviousboundaries,justlikethegradientofthesevencolorsofthesky,soitiscalledrainbowprinting.Thecolorofthebackgroundshadingonthefrontofmycountry'shundredyuanrenminbihasgraduallytransitionedfromorangeandyellowtoorange,green,andblue,andthistechnologyhasbeenappliedtothesecondgenerationofIDcards.
Effect
Rainbowprintingeffectisdifficulttoachievebymulti-coloroverprinting,anditisdifficulttoseetheexactpositionofthepartitionsofeachcolorintheinkfountainonthecommercialpaper.Itisalsodifficulttodeterminethespacingofthepartitionswiththemethodofrainbowprinting,whichincreasesthedifficultyofcounterfeiting.Ifthisprocessisusedonalargeareaofshading,itsanti-counterfeitingeffectwillbemoreobvious.
Printingprocess
Single-platemulti-colorprintingprocess:Single-platemulti-colorprintingmeansthattheinktankisdividedintoseveralparts,andthendifferentinksareplacedseparately,andtheinkispassedthroughaseriesofrollers.Whentheinkisrolled,theedgesofthevariousinkshavebeenkneadedtogetherwhentheinkreachesthePS,andtheprintedpatternislikearainbow.Heisover-differentiationofsolidink,verysaturated,andtheeffectisbetterthanfour-colordots,butitcanonlydoverticaldifferentiation,notpartial.