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Comment September 1990 PIGMENT AND RESIN TECHNOLOGY 3 Putting HVLP spraying in perspective HVLP (high volume low pressure) spraying equipment is much in the news, with Binks-Bullows and DeVilbiss setting the pace. Without wishing to deny HVLP's undoubted advantages for certain applications — particularly wit h low viscosity/low solids materials, are we not in danger of believing that HVLP is a universal panacea for improving transfer efficiency and reducing solvent emissions? Our two worthy pace setters mentioned above both have American parent companies, who were inspired to develop their HVLP systems to meet the tough Californian regulations(SCAQMD) for low VOC (volatile organic compound) emissions. Both HVLP systems are excellent in applying low viscosity materials, with transfer efficiencies of in excess of 65% being obtained and which satisfy the Californian regulations. However, as the intent of the regulations and those elsewhere is to limit VOC emissions, then surely the answer to the problem is to either use water-based materials or higher solids for better transfer efficiency? If this be the case, then undoubtedly the most efficient equipment to use, and probably more economical in the long run, is the established air assisted airless equipment, sometimes called Airmix, some of which can now operate at 10 p.s.i. Above all, what we are saying is that whilst the two leading HVLP systems are excellent for the specific tasks defined above, air assisted airless is a far more versatile spraying method, able to apply a much wider variety of coatings and at higher output rates in many cases. There is also the point that air assisted airless (Airmix) uses far less air than HVLP. More on TiO In our recent comments upon titanium dioxide — its availability, its price and its technical developments, we have not mentioned Du Pont as a leading supplier. With companies who produce TiO by the sulphate process facing ever more stringent regulationss due to environmental problems, it should be noted that Du Pont is the only major TiO supplier whose entire production is by the chloride process. This is said to generate one-third to one-seventh the amount of waste as the sulphate process and consumes one-half the energy. However, Du Pont do not mention the fact that, as w e understand it, sulphate produced TiO generally shows superior resistance to uv light. Whether this still stands true or not, Du Pont are busy opening up more and more of their "Ti-Pure" plants world-wide, which are all based on the chloride process. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Pigment & Resin Technology Emerald Publishing

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Pigment & Resin Technology , Volume 19 (9): 1 – Sep 1, 1990
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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0369-9420
DOI
10.1108/eb042761
Publisher site
See Article on Publisher Site

Abstract

September 1990 PIGMENT AND RESIN TECHNOLOGY 3 Putting HVLP spraying in perspective HVLP (high volume low pressure) spraying equipment is much in the news, with Binks-Bullows and DeVilbiss setting the pace. Without wishing to deny HVLP's undoubted advantages for certain applications — particularly wit h low viscosity/low solids materials, are we not in danger of believing that HVLP is a universal panacea for improving transfer efficiency and reducing solvent emissions? Our two worthy pace setters mentioned above both have American parent companies, who were inspired to develop their HVLP systems to meet the tough Californian regulations(SCAQMD) for low VOC (volatile organic compound) emissions. Both HVLP systems are excellent in applying low viscosity materials, with transfer efficiencies of in excess of 65% being obtained and which satisfy the Californian regulations. However, as the intent of the regulations and those elsewhere is to limit VOC emissions, then surely the answer to the problem is to either use water-based materials or higher solids for better transfer efficiency? If this be the case, then undoubtedly the most efficient equipment to use, and probably more economical in the long run, is the established air assisted airless equipment, sometimes called Airmix, some of which can now operate at 10 p.s.i. Above all, what we are saying is that whilst the two leading HVLP systems are excellent for the specific tasks defined above, air assisted airless is a far more versatile spraying method, able to apply a much wider variety of coatings and at higher output rates in many cases. There is also the point that air assisted airless (Airmix) uses far less air than HVLP. More on TiO In our recent comments upon titanium dioxide — its availability, its price and its technical developments, we have not mentioned Du Pont as a leading supplier. With companies who produce TiO by the sulphate process facing ever more stringent regulationss due to environmental problems, it should be noted that Du Pont is the only major TiO supplier whose entire production is by the chloride process. This is said to generate one-third to one-seventh the amount of waste as the sulphate process and consumes one-half the energy. However, Du Pont do not mention the fact that, as w e understand it, sulphate produced TiO generally shows superior resistance to uv light. Whether this still stands true or not, Du Pont are busy opening up more and more of their "Ti-Pure" plants world-wide, which are all based on the chloride process.

Journal

Pigment & Resin Technology – Emerald Publishing

Published: Sep 1, 1990

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