Enameling Systems
Release time:
2026-05-15 15:12
Source:
Glass and Enamel
Abstract: The various enamelling systems which are currently available to us were reviewed. The advantages and disadvantages of each process method and their enviornmental impact were analyzed. The proposals for making choice of effective enamelling system were also made.
Key words:Enamel; Enamelling system; Environmental protection
Introduction
In the mid-1970s, most enamel operations involved directly applying wet-ground enamel slurry to pickled steel plates. Since the early 1980s, many new processes have been developed based on the traditional two-stage enamel coating and two-stage firing process. Understanding and mastering these enamel processing systems not only helps in selecting effective enamel systems in actual production but also has a positive impact on environmental protection, while saving energy, improving efficiency, and promoting productivity.
1. Wet-Grinding Enameling Systems for Pickled Steel Plates
In the late 1970s, large-scale pickling equipment was commonly used, requiring chemical treatment of the steel plates before enamel application. This pickling process was either dipping-type or spray-type. Dipping-type pickling systems consume a large amount of energy and generate a hot working environment, requiring a cycle time of 1-2 hours. The spray system operates on the same principle as pickling, except that the parts are suspended on an infeeder. When the transported parts pass through the sprayed chemical reagents, they achieve a pre-chemically treated steel surface similar to that of the pickling system. Using this pickling process, all enamel frits must be wet-ground, and the enamel is applied to the steel plate by dipping or spraying, followed by drying and firing. This process mainly requires the following steps: (1) Pickling (2) Wet grinding of enamel slurry (3) Enameling (4) Drying (5) Firing. This process is labor-intensive, has complex pretreatment processes, and causes serious environmental pollution.
(To be continued)
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