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Significance of Temperature Settings in Powder Coating Ovens

June 28, 2016

Powder coating ovens liquidise specially formulated powders, transforms the hue and texture-laden granules into a free-flowing film that cures to become a durable shell-like skin. The process begins with electrostatic technology and a charged powder, but it's the ovens that regulate the liquid state, thus ensuring the finish cures correctly. Temperature variances define this baking-hot environment, so let's see how different temperatures affect finish quality.

Attentive Cooking Guidelines

The technology on display here is dependent on a handful of factors. The proper cleaning of the source object is important, naturally, as is the charge applied. But once the part is in the oven and we know it's fully covered in powder, we're looking at a cure-oriented setting. The temperature must be optimised, which is a factor set in stone by the brand, plus this temperature must be held for a set period. If these heat-dependent factors, temperature and time, are accurately governed, then the part will cure accordingly.

The Significance of Oven-Related Features

Curing work is regulated by time and thermostatic controls, so an even bake is all that's required inside the heated chamber. That doesn't seem like a lot to ask for, but certain unpredictable factors are working to invisibly undermine the hardening stage. Powder coating ovens use fans and specially shaped elements, infrared lamps and digitally adjustable thermostats to minimise cure artefacts, but these technological assets are no substitute for an informed application strategy. In effect, the ovens can introduce potential overcure and undercure incidents, but these undesirable events are avoidable.

A Considered Look at Over and Under Curing

Overcured parts tend to discolour, but, more than this, they're no longer abrasion and weatherproof. The amber cast detracts from the chrome-like beauty of an aluminized finish and chips or scratches easily. Adhesion problems and poor flow rates signify an undercure issue, a problem where the temperature of the oven is too low or the time spent in the oven has been abbreviated in some manner. Corrosion resistance is severely compromised by a substandard curing cycle, as is the hardness of the finish. Other symptoms include too much or too little glossiness. Also, beware of localised instances of these undesirable events, for obstructed infrared lamp coverage is an issue when more complex geometrical profiles are part of the work.

Powder coating ovens are designed to evenly distribute their curing temperatures, but operator errors and production malfunctions can inhibit powder hardening stages, which will result in these undesirable under and over cure conditions

GP Industries Pty Ltd

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Phone: (03) 9802 1355

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Email: gp_ind@bigpond.com

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