In the glass melting process of glass bottles, various salts in the powder will be decomposed at high temperature, and a large amount of gas released will be continuously removed from the melt. The melt enters the clarification stage and continues to remove bubbles. In order to accelerate the elimination of bubbles, high-temperature melting is generally used to reduce the viscosity of the glass liquid, or to add substances that reduce the surface tension, or to reduce the pressure in the kiln to allow the bubbles to escape. But despite this, some bubbles still remain in the molten glass, or bubbles are generated after the molten glass interacts with the furnace gas and cannot be eliminated in time, which forms residual bubbles.
To prevent this defect, we must strictly abide by the ingredients and melting system, or adjust the melting temperature, change the type and amount of clarifying agent, or appropriately change the glass composition to reduce the viscosity and surface tension of the melt. The above are all measures to help eliminate bubbles in the glass liquid.