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The manufacturing process of PPGI coils involves several key steps:
● Substrate Preparation: The process begins with the preparation of the steel substrate, which is usually cold-rolled steel. This substrate is cleaned and treated to ensure proper adhesion of subsequent layers.
● Chemical Treatment: After galvanizing, the steel undergoes a chemical treatment to enhance the adhesion of the paint layers. This step often involves the application of a chromate or phosphate coating.
● Primer Coating: A primer coating is applied to the treated steel. The primer serves as a base layer that improves the adhesion of the topcoat and provides additional corrosion resistance. It is usually applied using a roll-coating process and then cured in an oven.
● Top Coating: Once the primer has cured, the topcoat is applied. This coat provides the desired color and finish to the PPGI coil. The topcoat is also applied using a roll-coating process and then cured in an oven. Various types of paints can be used, including polyester, silicon-modified polyester, polyvinylidene fluoride (PVDF), and epoxy.
● Coil Winding: After the topcoat has cured and passed quality control checks, the steel is wound into coils. These coils are then packaged and prepared for shipment to customers.
