Colour-coated coils, formally known as colour-coated steel sheet coils, utilise cold-rolled steel sheets, galvanised steel sheets (hot-dip galvanised, electro-galvanised, etc.), or aluminium-zinc-coated, zinc-aluminium-magnesium, or other metal-coated steel sheets as the substrate. The surface undergoes pretreatment (degreasing, phosphating/passivation) to remove oil residues and oxide layers. Subsequently, one or multiple layers of organic coatings (primer, topcoat, some with backcoat) are uniformly applied via a continuous roll-coating process. Finally, the material is cured through high-temperature baking to produce a composite metal coil. Combining the strength of the metal substrate with the weather resistance and decorative properties of the organic coating, it is a commonly used ‘high-performance, high-aesthetic’ material in industrial and architectural applications.
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