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Application Process | |
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Technical Main Page, Technical Datasheets, Guaranteed Performance, Technical Manual, Application Process, Manufacture of Powder Coatings |  |
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| The pretreatment and application processes that are used by Synthatec Approved Applicators are clearly defined in the Synthatec Technical manual. The pretreatment, application and curing processes will only be generally discussed here. Please refer to the relevant sections of the technical manual for further detail. |
 Vertical powder coating application line |
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| Pretreament
is the process of cleaning the metal and applying a preliminary chemical coating
prior to the application of the powder coating. It is of utmost importance that the metal to be coated is completely free of oil, grease, dust or other contaminants. This ensures that the powder coating will adhere to the substrate not only during the applcition and curing process but also 'in the field'. Cleaning is typically carried out using either alkaline solutions (for aluminium) or acid etch solutions (for galvanised steel), and water rinses. The preliminary chemical coating (often referred to as a conversion coating) acts as both a corrosion inhibitor and surface enhancer, providing a 'key' for the powder coating to adhere to. The Synthatec process allows for the use of chromate-type conversion coatings on aluminium and zinc-phosphate on galvanised steel. These coatings are applied by either spray or dip, followed by water rinses and a drying operation. |
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| Application of powder coatings is by electrostatic spray. In this process, powder taken from a hopper or direct from the manufacturers box is mixed with compressed air and fed through a spray gun where the powder particles are electrically charged. This charge causes the powder particles to be attracted to, and cling to, the earthed workpiece. Coated articles are then transferred to a curing oven. Powder that does not cling to a workpiece can be collected and reused. | ||||
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Curing
most commonly takes place in a gas or electric oven. |
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| Packaging is a critical step to ensure that the finished articles arrive on site ready to be installed. Synthatec Approved Applicators recognise the need to protect coated components, and will as a rule wrap components in packaging that is ph-neutral to prevent chemical attack. Extrusion is often protected with special tapes to protect significant surfaces against abrasion in transit and during installation. |
 Automated wrapping and taping of extrusion following powder coating application. |
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SYNTHATEC™
is a trade mark of Valspar Powder Coatings Ltd.
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