Coil Coatings, also known as prepainted or post-painted metals, are thin film coatings applied to continuous rolls or coils of steel or aluminum prior to fabrication. During the coating process, metal coils pass through a series of washers, rinse zones, and ovens to apply primers and topcoats to the metal substrates. Once coated, the metal coils can then be cut, shaped, and assembled into finished products.
Coating Application and Curing Processes
There are two primary types of coating application processes used in Coil Coatings lines - roll coating and knife (or blade) coating. In roll coating, the coating is applied by rolling one or more applicator rolls over the metal surface. Knife coating uses a slot die coater to precisely meter out the liquid coating onto the moving coil beneath a sharpened doctor blade, which spreads the coating to a uniform thickness.
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