Two-Coat-One-Fire Enameling System (3) - Wet-to-Dry Process
Release time:
2026-06-12 15:37
Source:
2.3 Wet-to-Dry Process
A ground coat slurry containing an adhesive is applied by spraying or dipping, then allowed to dry completely. Subsequently, a dry powder enamel is sprayed onto the dried ground coat using electrostatic spraying.
The advantages of the wet-dry enamel system are:
(1) Suitable for mass production of a limited number of plates and dishes in a few colors (white and cyan).
(2) A smooth enamel surface is achieved due to the low-pressure spraying of the powder.
(3) Compared to the dry-dry process, the bubble structure of the ground coat is easier to control, and double-sided enamel application is possible by adding quartz to the ground coat.
(4) Compared to the dry-dry enamel process, the thickness of the ground coat layer can be varied without affecting the final surface coating; the ground coat layer thickness can reach 80 μm. In this process, the edge effect is crucial for electrostatic spraying of the ground coat.
(5) Due to the electrostatic effect and Faraday cage effect, there is no interpenetration or mixing of the dried ground coat layer.
(6) It has a wider range of applications for complex designs.
(7) There is no possibility of electrostatic interaction between the ground coat layers, and the number of spray guns can be reduced when spraying dry powder enamel.
(8) Since the ground coat layer is equivalent to an insulator after drying, there is no thickening on the edge substrate.
(9) Compared with the dry-dry system, the wet-dry system seems to have a wider range of applications.
Disadvantages of the wet-dry enamel process system:
(1) The color selection of the dry powder enamel is limited.
(2) In this process, powder spraying should be carried out in a temperature and humidity controlled air-conditioned chamber.
(3) If double-sided enameling is required, zero-carbon steel must be used.
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