HOME > INDUSTRY > Chemical > Powder Coating
is a color-finishing technique in which powder is used in lieu of paint. The powder is applied with spray tools and heated to a chosen surface to form a color coat.
The main difference in comparison to a conventional liquid paint is that powder coating does not require a solvent to keep the binder and filler parts in a liquid suspension form.
Powder coating achieves a thicker and more consistent finish than you usually get with spray paint.
Making powder coatings is a multi-step process, essentially composed of batching, premixing, extrusion and particle size reduction. It can be described as being semi-continuous because it begins as a batch process (weighing and pre-mixing) but evolves into a continuous process (extrusion and milling).
Basically, a compilation of somewhat dissimilar materials are blended, melted, cooled and then pulverized.
The first step is to weigh the raw materials according to the ratios specified in the master formula. The weigh-in takes into account the quantity required by the customer order as well as the capacity of the premixing vessel.
Tiermax high-accuracy feeders are made to accurately dose raw materials (loss in weight, volumetric) or liquids. They can be used for both (loss in weight).
The premixing step makes the raw materials mix more homogeneous so that a consistent mixture can be fed into the extruder. It also breaks down large resin particles so that the mix can be fed into the extruder more quickly.
Choosing the right mixing system is essential to the operation’s success.
TIERMAX offers a wide range of standard and tailor made mixing solutions for powder coating production.