Briefintroduction
duplicaling-preventerpaper
Manufacturingclassification
(1)Light-absorptionanti-copypaper,addingrighttothepulpSpecialpigmentswithextremelylowlightreflectanceandextremelyhighabsorptivity,orthepigmentscanbemadeintoafilmtofirmlycoverordinarypapertoachievetheanti-copyeffect;
(2)Lightdiffuseanti-copypaper,Usevacuumsteamtosprayaluminumpowderwithverysmallparticlesonthesurfaceofthepaper,andthencoatit,ormakeatransparentfilmwithcolorantandmetalfoiladheredtothesurfaceofthepaperinthewayoffilmcoating;
(3)Usepolarizingmaterialstobecoatedorcoated;
(4)Useluminescentmaterialssuchasfluorescentsubstancestoaddtothepulptomakeacoating.
(5)VIODlogopapercontainsasubstancethatpreventscolorcopying.Whenanti-counterfeitingprintedmaterialssuchastrademarksarecopiedwithacolorcopierorscannedbyascanner,itwillclearlydisplaythewords"VIOD"andthelogoisprinted.Inblackandwhite.ThisVIODlogocanbeusedonthepackagingofCD-ROM,computersoftware,cosmetics,etc.
(6)Theprincipleofcoloredanti-copypaperistocolorthebasepaperwithspecificdyesandpigments.Afterexposureduringcopying,thecontrastdisappearsbecausethetextimagepartandthebackgroundhavethesameabsorption.Whenthephotoreceptorisexposed,itisalmostfullyexposed,thereisnocontrast,andthecopybecomesallblackanditisimpossibletoformanimage.Thedisadvantageofthismethodisthattheoriginalisnoteasytoidentify.Thepracticalcolorisreddishbrown.
(7)Theso-calledphotochromicofphotochromicanti-copypaperreferstothecolorchangeofcertaincharacteristicsafterlight,andthenreturnstotheoriginalcolorafterleavingthelight.
Photochromicanti-counterfeitingpaperistheanti-counterfeitingpapercontainingthesesubstances.Thiskindofanti-copypaperiscoatedwithachemicaldiscoloration(coloringordecoloring)materialonthepaperbase,whichisactivatedbyexposuretochangecolorduringthecopyingprocess,sothatthereisnodifferenceinthecontrastbetweenthebackgroundpartandtheimagepartandcannotbecopied.Aftertheoriginalleavesthecopier,thebackgroundpartreturnstoacolorlessstateagain.
(8)Thephotoluminescentanti-counterfeitingpaperemitslightduetolightexcitationduringcopyexposure,andthecopybecomeswhiteandcannotbecopied.
(9)Fluorescentpaperusesfluorescentmaterialsonthepaperbase(fluorescentadditivesareaddedinthepapermakingprocessorfluorescentfibersareused),andthelengthoftheemissionwavelengthofthefluorescentmaterialsisusedinthecopyingprocesstomakethecopybecomeAllblackorallwhite,toachievethepurposeofanti-copying.
(10)Polarizedanti-copypaperThiskindofanti-copypaperismadeofapolarizingfilmmadeintoafilmtocoverthepaperbase,andthedichroismoflightisusedduringcopyingtoreducetheimpactofwordsandpaperonthephotosensitivedrum.Contrastsothatthecopyappearsblack.
(11)Thermochromicanti-copypaperThiskindofanti-copypaperiscoatedonthepaperbasewiththermochromicmaterialthatiscolorlessatroomtemperature.Color,sothatthecontrastbetweentheimagepartandthebackgrounddisappearsandcannotbecopied.Whenthetemperatureisrestoredtonormaltemperature,thecoloriseliminated,andthebackgroundpart,thatis,theoriginal,becomestheoriginalcolorlessstate.Thecolorlessmaterialsusedforfluoranindecolorization,phenoldeveloper,aminophenylmercurydithizonesalt,etc.areused.
Applicationfield
Thistypeofpapercanpreventdocumentsanddatafrombeingcopied,andhasagoodsecurityperformance.