Description: Gravureprintingusesplasticwater-basedinks,whichareenvironmentallyfriendly,andmoreandmorepeopleintheindustryarepayingattentionto.Sowhatshouldbedonebeforegravureprintingusesplasticwater-basedinks?1.PrintingplateTheprintingplateadoptselectronicengravinggravureorlaserengravinggravure,andthedepthofthemeshis15-25um,whichislighterthansolventinkgravure.Thisisbecausetheinkisproducedwithtapwater,andtheboilingpointofwaterishigherthanthatofthesolvent.Therefore,theinkisnoteasytovolatilize,andtheshallowplatecanincreasetheprintingspeedandavoidwaterripples.Ifyouusesolvent-basedinkprinting,thecelldepthoftheprintingplateis35---40um,whichiseasytoproducewaterripples;butwhenusinginkprinting,thecelldepthoftheprintingplateismorethan25um,therewillbewaterripples,sochoosetherightoneTheprintingplateiscrucial.Watercanbeusedtoadjusttheviscosityoftheinkwheninuse,andtheviscosityofthecoating-4canbecontrolledtobe15-25seconds/25°C.Iftheviscosityistoohigh,thetransferperformanceoftheinkwillbepoor,anditiseasytocausethedirtyplate,pasteplateandotherdefects.2.GooddryingequipmentThedryingtemperatureshouldbedeterminedaccordingtothedifferentsubstratesandthesizeoftheprintingarea.Forexample,foraluminumfoilwinelabelprinting,thedryingtemperatureshouldbeabove100℃;forplasticfilmprinting,thedryingtemperatureshouldbe50~60℃.Windpowershouldbestrongerthanusingsolvent-basedinks,becausehotaircanquicklydrytheinkafteritistransferredtothesubstrate.3.SurfacetreatmentExceptforaluminumfoil,vacuumaluminizedfilm,andpaper,allplasticfilmsneedtobetreatedwithelectricsparkbeforeinkprinting,sothattheirsurfacetensioncanreach0.04N/mormore.Fortheinkproducedwithwaterasthemainsolvent,sincethesurfacetensionofwaterisabout0.072N/m,itcanbeseenthatthesurfacetensionoftheinkdiffersfromthesurfacetensionofthefilm,whichwillaffecttheadhesionoftheinkonthesubstrateandimprovetheplasticfilm.Surfacetensioncanimprovetheadhesionofprintedpatternsonthefilm.
Gravure printing uses plastic water-based inks, which are environmentally friendly, and more and more people in the industry are paying attention to. So what should be done before gravure printing uses plastic water-based inks?
1. Printing plate
The printing plate adopts electronic engraving gravure or laser engraving gravure, and the depth of the mesh is 15-25um, which is lighter than solvent ink gravure. This is because the ink is produced with tap water, and the boiling point of water is higher than that of the solvent. Therefore, the ink is not easy to volatilize, and the shallow plate can increase the printing speed and avoid water ripples. If you use solvent-based ink printing, the cell depth of the printing plate is 35---40um, which is easy to produce water ripples; but when using ink printing, the cell depth of the printing plate is more than 25um, there will be water ripples, so choose the right one The printing plate is crucial. Water can be used to adjust the viscosity of the ink when in use, and the viscosity of the coating-4 can be controlled to be 15-25 seconds/25°C. If the viscosity is too high, the transfer performance of the ink will be poor, and it is easy to cause the dirty plate, paste plate and other defects.
2. Good drying equipment
The drying temperature should be determined according to the different substrates and the size of the printing area. For example, for aluminum foil wine label printing, the drying temperature should be above 100℃; for plastic film printing, the drying temperature should be 50~60℃. Wind power should be stronger than using solvent-based inks, because hot air can quickly dry the ink after it is transferred to the substrate.
3. Surface treatment
Except for aluminum foil, vacuum aluminized film, and paper, all plastic films need to be treated with electric spark before ink printing, so that their surface tension can reach 0.04N/m or more. For the ink produced with water as the main solvent, since the surface tension of water is about 0.072N/m, it can be seen that the surface tension of the ink differs from the surface tension of the film, which will affect the adhesion of the ink on the substrate and improve the plastic film. Surface tension can improve the adhesion of printed patterns on the film.
0760-88417268
Message