environmental controls

WATER POLLUTION CONTROL

FOR PAINT BOOTHS

BY ALAN MONKEN

As a nonrenewable resource, water and its conservation are of prime importancein the metal finishing industry. The reduction and control of water pollution inthe manufacturing process is an important area for improvement; one of the mostcritical areas of industrial water usage is the paint shop. Current technology canbe utilized to reduce water consumption and improve the efficiency of water use.To put this technology in perspective, it is necessary to explore the use of water inthe paint shop, the available chemical means to deal with water pollutants, andthe mechanical means of removing these pollutants.

THE PAINT SHOP

The function of the paint shop is to apply an organic coating (i.e., paint) to a substrate(i.e., metal or plastic) for protective and decorative reasons. The paint canbe applied in various forms, including dry powder, solvent-diluted formulations,and waterborne formulations. The application method can vary widely, two ofthe most common being through spraying or through immersion. In the case ofimmersion or dip-paint systems, very little paint waste is generated. The drawbackto immersion painting, however, is that variations in paint colors and types areseverely limited within the same operation. Spray systems allow a great deal offlexibility in the types and colors of coatings that can be applied.The downside of spray systems is that not all of the paint sprayed comes intocontact with the work surface. The paint that misses the production part is commonlyknown as overspray. If the process being used is powder painting, the oversprayedpaint can most typically be collected and reused (the ability for capturingthis excess powder typically is designed into the powder paint spraying system orbooth). If the process involves liquid paint, however, the paint overspray quicklychanges from an asset to a liability as it becomes paint waste. Although it is possibleto collect this oversprayed paint on dry-filter media....

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مرجع:شرکت جلاپردازان پرشیا