Advantages and disadvantages of different height powder layers
Release time:
2025-06-18 00:00
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1. Advantages and disadvantages of powder layer thickness
Taking conventional soda-calcium wine bottle products as an example, under normal circumstances, the height of the powder layer is controlled at 200~300mm, and the production effect is the best. If the height of the powder layer exceeds this range, it is easy to cause uneven material, that is, the height of each part of the powder layer is different, and frequent manual adjustments are required during the production process to maintain the flatness of the powder layer. Increasing the height of the powder layer will cause the interface between the molten glass and the powder layer (i.e., the theoretical liquid level position on the side of the melting cell) to move downward, and if a top-plug electrode is used, the electrode will be exposed to the powder layer, which will increase the risk of oxidative fracture of the electrode. However, the increase in the thickness of the powder layer can improve the insulation effect on the top of the melt bath, reduce heat loss, and thus reduce the energy consumption per unit of product. It should be noted that there are differences in the adaptability of different formulations of frit to the height of the powder layer, such as high barium and high boron, etc., and the excessively thick powder layer will hinder the normal discharge of gas, resulting in problems such as "hair cylinder" (the gas will lift the molten glass together with the powder, resulting in irregular overflow in the melting pool space) and "drum cannon" (the gas discharged locally from the powder layer will bulge the molten glass into a bubble, but it will not break, which is slightly less than the "hair cylinder" phenomenon) and other problems, such as improper treatment, It is easy to cause defects such as bubbles and stones caused by poor melting of molten glass.
2. Advantages and disadvantages of thin powder layer
In the glass production process, a thin powder layer helps to improve the heating uniformity of the glass raw material. The thinner layer of the powder allows the heat to penetrate the powder more quickly and evenly, which can improve the uniformity of the molten glass to a certain extent. This feature is crucial for products that require high glass uniformity.
When the powder layer is thin (height < 200 mm), the heat loss in the melting pool space is intensified, resulting in a significant increase in furnace energy consumption. In extreme cases. Due to the large loss of heat, the thermoelectric temperature is difficult to reach the set value, and the molten glass cannot be fully melted and clarified, resulting in a large number of stones, bubbles and other defects. In addition, the melt pool space is in a "red-top" or "semi-red-top" state for a long time, and the high-temperature environment is also a great challenge to the thermal stability of the feeder. For example, in the production process of high-boron glass, because the melting pool space is often in a semi-red-top state, the belt of the feeder needs to be made of high-temperature resistant material, while the production of ordinary soda-lime frit does not need this special requirement.
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