The Furnace Used in the Enamel Industry
Release time:
2026-04-15 15:09
Source:
The furnace is a crucial piece of equipment in the enamel industry. The quality of the furnace significantly impacts product quality, output, production efficiency, and production costs.
1. The Impact of the furnace on Product Quality
1.1 The Impact of Furnace Temperature on Product Quality
Each enamel frit has its maximum and minimum firing temperatures. When the furnace temperature exceeds the maximum firing temperature, the enamel layer will be "over-fired," resulting in an incorrect color, or even the enamel surface may detach, exposing the base layer or exhibiting numerous pores. Conversely, when the furnace temperature is below the enamel firing temperature, the enamel layer will be "under-fired," resulting in an incorrect color, lack of luster, easy separation from the base layer, and poor adhesion.
Furnace temperatures exceeding the enamel firing temperature frequently occur during production. This is because the product undergoes a heat exchange process as it enters the furnace from a cold state, requiring a certain amount of time. The time it takes for the product to reach its firing temperature depends on the temperature distribution and maximum temperature within the furnace, and is also related to the shape and quality of the product. furnace with heat exchange zones heat the products earlier, and in furnace with longer high-temperature zones, the products are heated earlier as well. This allows the products to gradually reach the firing temperature, resulting in even heating of the inner and outer layers of the enamel and a longer time for the enamel to melt and level. The resulting products have a fine, smooth surface and good adhesion.
Some furnace lack heat exchange zones (preheating zones), and the high-temperature zone for firing the products is relatively short. In this case, the products are heated in the furnace for a shorter time, and the furnace temperature must be significantly higher than the enamel firing temperature to ensure the enamel is fully fired. Products fired in this way have a less smooth surface, uneven heating of the enamel layer, and poor adhesion. Another factor contributing to higher furnace temperatures is that producers prioritize high output. Higher furnace temperatures necessitate faster furnace operation; otherwise, the enamel will become "over-fired." The porcelain enamel industry's key firing principle, "low temperature, long firing," involves appropriately extending the firing time at a suitable low temperature to achieve the optimal firing layer.
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