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Screening fine powder coatings

Ultrasonic sieving in the powder coating industry

Over the past few decades, the powder coating industry has seen double-digit growth in the US and Europe. However, over the past few years, with a slowing market and rising raw material costs, manufacturers are being forced to look even more closely at all aspects of their business to maintain growth and healthy profitability.

The powder coating process
The powder coating process involves a number of steps taking the raw materials through various stages to form a ‘plastic’ mix. This is then cooled and broken down into plastic chips before being micronized and passed through a cyclone classifier to separate the large and fine particles.

Quality control screening
The final stage of the process involves screening the fine powder to remove extraneous contaminants such as filter bag ‘fluff’. Screening the powders at this stage ensures only powder of the correct particles size is passed through to the filling line. This is critical because this will have a direct impact on the quality and film thickness that can be obtained during the coating process.


Problems with traditional methods of screening and the solution
To overcome the blocking of mesh, some manufacturers have experimented with ‘off-line’ screening and rotary sieves. However these methods can also compromise product quality since very little oversize is collected during the screening process. Russell Finex have developed the ultimate solution for this application. By combining the Russell Compact Sieve® check-screener and Vibrasonic® Deblinding System, the most efficient screening system can be obtained.

Contact Russell Finex to discover how Russell Finex's customized separation solutions can meet your exact requirements.


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What our clients say

“Any risk of product contamination has been eliminated completely with the Russell compact screeners. Compared to the rotary units we replaced, they are very simple to dismantle and clean. In addition, we no longer have pieces of nylon mesh finding their way into the product which was a frequent problem we experienced with the rotary screening machines.”

Idar Larsen, Jotun A/S
Path 8

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