Two-Coat-One-Fire Enameling System (2) - Dry-to-Dry Process
Release time:
2026-06-05 11:02
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2.2 Dry-to-Dry Process
The ground coat enamel powder containing an adhesive is applied to the surface of the substrate by electrostatic spraying, followed by spraying a powder cover coat enamel; no drying is required.
Advantages of the dry-to-dry process system:
(1)Suitable for mass production of plates and dishes in a limited number of colors (such as white enamel and apricot enamel).
(2) A highly automated, clean coating system with no enamel waste can be used.
(3) Energy-saving, no drying required.
(4) Low spray pressure, smooth surface of the cover coat enamel (the surface of the cover coat enamel can be affected by electrostatic interference between the ground coat and cover coat enamel layers).
Disadvantages of the dry-to-dry system:
(1) Not suitable for products with complex structural designs; cross-penetration of the ground coat and cover coat enamel layers may occur in the Faraday cage effect zone.
(2) Limited color selection for the cover coat enamel layer.
(3) Coating both sides of the product may produce surface defects, such as on the lid of a drinking vessel.
(4) High investment cost, because in addition to the spraying equipment, a constant temperature and humidity air conditioning system is required; otherwise, changes in temperature and humidity will lead to defects in the coating quality.
(5) Using non-zero carbon steel will reduce the quality of the surface enamel.
(6) The thickness of the ground coat enamel coating is very strict and must be precisely controlled between 30~40 μm; otherwise, cross-penetration with the cover coat enamel may occur.
(7) To minimize the electrostatic effect between the ground coat and cover coat enamel layers, the cover coat enamel should be sprayed using a low-voltage spray gun.
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