Environmental pressures are driving changes in filtration in the automotive finishing process. Automotive paint shop suppliers must find more environmentally sustainable solutions. The authors analyze the state-of-art of this market segment in Great Britain. Automotive and component manufactures are regulated by the UK Department of Environment, Food and Rural Affairs (Defra) 2010 Industrial emissions directive 2010, which includes the Integrated Pollution Prevention and Control directive (IPPC). The automotive coatings industry is concerned by this directive because the application of paint creates waste paint due to overspray which is harmful to the environment. Overspray is managed by dry filtration or by washing out, both of which would arrest the excess paint particles. Paint arrestance is developed to arrest finer particulates; but only iterative improvements were made and landfill volume was not reduced significantly. Arrestance filtration is a measure to reduce waste and VOC emissions. The IPPC directive additionally includes maximum levels for VOC emissions emanating from the paint. VOC emissions are created by the solvent vapour of the paint. The paint arrester acts as a primary collection of the paint agglomerate. The paint is blown onto the arrestor by the positive airflow from the booths. The solution is to create an airflow through the filter while at the same time capturing the overspray paint particulate. This capturing will be affected by (1) interception which occurs when the contaminant is larger than the path of the air flow and it is sieved out; (2) Inertia is much important as a significant portion of the contamination is greater than 10 microns. This particulate has the inertia in the airflow to be impacted into the filter; (3) Diffusion considers fine particulate that has limited relative mass; (4) Adsorption is the final generic filtration principle. Electrostatic, hydrophobic or hydrophilic interaction with the filtration media can occur. Electrostatic fibre filters have some drawback: the lifetime is limited because the fibres become saturated immediately with contaminate. Dry filtration is often land-filled and does not take priority over other process improvements.
Automotive finishing: Improving filtration in the automotive paint shop
Filtration and Separation ; 50 , 1 ; 22-26
2013
5 Seiten, 7 Bilder
Aufsatz (Zeitschrift)
Englisch
Umwelteinfluss , Umweltgesetzgebung , Großbritannien , Lackfarbe , Automobilindustrie , Lackieren , Farbspritzanlage , Industrieabfall , Filtration , Partikelgröße , flüchtige organische Verbindung , Luftströmung , Filter (Stofftrennung) , Sieben , Diffusion , Massenträgheit , Adsorption , Elektrofilter , Lebensdauer , Verunreinigung , Deponierung
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