Complex part shapes temperature sensitive substrates and demanding finish quality are just some of the challenges faced by chemistry suppliers and equipment manufactur ers alike This article reviews the development of UVcuring chemistries and techni ID: 50435
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RADTECH REPORT JULY/AUGUST 2003 process for the plastics industry,$ free of organic solvent carrier, butwhich retains the performance proper-conventional solvent or water-basedsolvent or water carrier, but formulateddry, solid coating.$ % & UV-curable coatings for plastics:¥To create coatings which could be¥To compensate for the lack oftions. Hence, UV-curable coatings forsprayable UV systems available commer-cially, but these are very limited. Theindustry, for example, where highHowever, the exception isUV-curable powder coatings. Thoughmany of todayÕs plastic coating opera-tions, current UV-curable powders arecoating plastics a little nearer.UV-powder coatings only require theUV-radiation curing. This reduces the %& & PropertyWater-BasedSolvent-BasedUV Curable40-60%60% (clear coatings)40-95% 20-30% (pigmented)Few at 100%Easy to apply andEasy to apply andDifficult to achieve becauseachieveachieve UV tends to produce hard VisualsAll gloss rangeAll gloss rangeAll gloss range possible. Very (gloss/matt etc.)possiblepossiblelow matt can be more difficult. ModerateHighHigh¥ÒEasyÓ switch from¥Known technology¥Small compact plantssolvent-based¥Wide range of¥High production ratessystems to reducesuppliers¥Reduced reject ratesVOC emissions¥Lower cost capital¥Range of textures/equipment ¥Energy/time costs¥High VOC levels¥Some solvents toto remove waterbe removedprior to thermal cure¥New technology¥New capital equipment RADTECH REPORT JULY/AUGUST 2003 the line speed; however, for 3-D parts,due to their complexity, it is moreIntensity, dose and UV spectrum mustÒshadow.Ó These are often combined in¥A programmed robot can move¥Short and modular UV lamps can be¥A variable power supply alters the¥Additional installation of reflectors¥Distance between the lamps and the¥Installations can be made with a UV¥The installation of ellipticalformer shadow areas (Figure 3).capacity between 8-16kg. Precision andcured; however, many degrees ofadapted for robotic use. Traditionally,position. To cure 3-D plastic compo-Robot mounted UV-curing lamps areprocess flexibility and high productivity.geometries possible. However, there is+ UV-curable coatings are nowwiden the usage of UV-curablecoatings in the plastics industry, & Parabolic reflector JULY/AUGUST 2003 RADTECH REPORT 23 factor; however, progress in this area istion process. Will this lead to newPolymer, Paint and RAHN USA Corp.Tel.001 (630) 851- 4220Fax001(630)851-4863rahn@rahn-corp.comwww.rahn-corp.comSpeciality Resin 01-554RAHNAGDörflistrasse120Tel.++41 1 315 4200Fax++41 1315 4350www.rahn.chLow gloss (gloss )Medium reactivityGood hardness and non-yellowingGood adhesion to various substratesSuitable for screen and flexo-printing Excellence in UV Curing BOMAR SPECIALTIES COMPANY 210 Holabird Avenue Winsted, CT 06098 Fax: 860-379-1528Web: www.bomarspecialties.com BSpecialties Co.UVSOLUTIONS INNOVATIONÉINNOVATIONÉCOATINGSLAMINATES