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 sieving the fine powder to remove extraneous contaminants such as filter bag ‘fluff’. Sieving 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’ sieving and rotary sieves. However, these methods can also compromise product quality since very little oversize is collected during the sieving process. Russell Finex has developed the ultimate solution for this application. By combining the Russell Compact Sieve® check-screener and the ultrasonic sieving system Vibrasonic®, the most efficient screening system can be obtained.
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