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Paperdyeing process, the objectis todyethe role ofpaperfibers.MechanismofdifferentDyeswithdifferentpulp,woodis knownasbasicdyesgreataffinity, suitable fordyeingpulplignincontent;pulpsurface with astrongnegative charge, then theDirect Dyeshardlyadsorbedions,withitto reducethe surface charge,the dyenear thefiber surfaceisfixed.Suchnon-electrostaticadsorptioncaused,bauxiteiscommonly used inpapermakingdyeretentionagent,becausethe majority ofpaperdyes areanionic, cationicaluminum compoundand anionicdye-formingcationmay beprecipitated andadsorbed onthe fiber surfacewhichisto retainthismechanismoccursat pH4.0-5.2, then thecharge density ofthe aluminumionsis high,the chargeis stronger. Dyescommonly used in thepapercoatingcoloredpaper,the dyeandthe paperfibersby covalent bond,ionicbondbetween,with thekey,and molecularhydrogenbindingforces,whichdepends onthe color fastnessofadhesionstrength,exactlyin whatbasedcombination, dependingon the structure ofthe dyemolecule.