Metal Finishing Guide Book

2012 Organic Finishing Guidebook Issue

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Page 180 of 331

coating is cured in what order? 3.Recommended lamp operating power setting(s) (200 Watts/in., 300 Watts/in., 400 Watts/in., etc.). Recommended UV Dosage Recommended UV dosage should be expressed as J/cm2 (milliJoules/cm2 (Joules/cm2 ) or mJ/cm2 ). Be aware that UV radiometers need to be recalibrated at least once a year. Do not accept from your supplier are commended UV-dosage value to simply 300 Watts/in. This is a lamp power setting on the UV equipment and provides no information on the UV dosage required for curing the coating. The integration of UV-equipment systems must be performed by reputable ven- dors experienced in designing and installing UV-curing systems as well as sup- porting the customer after installation. It is a good idea to visit your potential coating supplier to meet with your potential support team. Support teams are comprised of a sales/field repre- sentative, in-house sales contact, and a technical support contact who may be the product manager/chemist or a technical support representative. During your visit review your project goals, tour lab and production facilities, and ask questions. The presence of various types of UV equipment and analyti- cal and physical testing equipment should be evident — ask questions about the systems. Unless you are a competitor your coatings supplier should not refuse a tour request unreasonably. CONCLUSION In addition to providing superior performance properties, UV processing har- vests the best of both worlds: the ease of applying liquids and the environ- mental benefits of powder coatings. The economic benefits of UV processing coupled with the performance properties of UV coatings makes obvious the su- periority of UV processing over other competitive technologies. Where other coating technologies rely on the same raw material building blocks that have been available for decades UV formulators enjoy a fast-growing arsenal of new- ly developed, high-performance raw materials. This makes UV technology the most dynamic, fastest evolving, and economically attractive coating technol- ogy available today. REFERENCES 1. Sokol, A. and F. Zychowski, "Corrosion Resistant Coating Systems": UV Cured 'Liquid Powders' 2. Sokol, A., "Zero VOC Paints and Coatings: Quantum Mechanics in a Paint Can," Society of Manufacturing Engineers, Finishing '97,Rosemont, Ill. 3. Sokol, A., "UV-Curable Plaints and Coatings: A Practical Application of Quan- tum Mechanics," Metal Finishing, 96(1A):30—36: 1998 4. Sokol, A., "Dimensional UV Radiometers: A New Way to See Ultraviolet Light," Society of Manufacturing Engineers, Nashville,Tenn.; 1997 5. Sokol, A., "Dark Cure: An In Situ Spectroscopic Examination of UV Cured, Zero- VOC Coatings," American Chemical Society North American Conference, Div. of Polymeric Materials: Science & Engineering, San Francisco; April 14, 1997 179

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