Clean and clean glass bottles are very proud of the art, a little defect and damage will directly affect the sale. In the process of manufacturing, bubbles are a common problem, but also more difficult to deal with.
In order to better remove the bubbles, the first step is to figure out the cause of the bubbles.
1. The gas in the gap of raw material particles and the gas adhered to the surface of the raw material
In the early stage of the mutual mixing material melting, such gases continue to evaporate or volatilize, generate large bubbles in the whole process of lifting and escape the glass liquid and generally do not immediately cause the glass product to occur so visible bubbles. Unless the size distribution of the raw material is manipulated improperly, the combined material caking is not melted enough, and the gas cannot be discharged.
2,. The gas released by the dissolution of salt
Lot numbers are high in inorganic salts, potassium thiocyanate, and phosphates. This salt dissolves when heated and creates many tiny bubbles. The amount of gas caused by salt dissolution is about 15-20% of the net weight of the batch. Compared with the resulting liquid glass, the volume is many times larger. A lot of this gas is released and continues to move, which increases the efficiency of the heat exchanger, speeds up the melting of the batch and improves the balance and temperature symmetry of the glass bottle composition. However, the bubbles created by this gas cannot be removed immediately to produce glass bubbles.
3. Gas caused by external reasons
The gas is formed by the liquid effect of glass, the hazardous residue components, and the gas is extracted from the refractory insulation material, and the glass bubbles generated by the gas are long in the normal production process and are not easy to fade, but the situation is rare.
How do glass bottles eliminate air bubbles?
In the whole process of reducing the temperature of the glass liquid, because the gas turns cold, the gas working pressure is the same, and the bubble will shrink. Because of the glass interfacial tension, the working pressure in the bubble expands due to the decrease of the half channel, and the saturation pressure of the gas in the glass liquid is less than the working pressure of the gas in the bubble, and the gas in the bubble is released into the glass liquid.
Because the gas is released, the bubble is half-filtered and reduced, and the interfacial tension of the glass liquid further increases the working pressure in the bubble until the bubble is completely digested and absorbed by the glass liquid. All the above countermeasures are in order to better remove the bubbles in the glass. To prevent such defects, be sure to carefully follow the composition and melting manual, adjust the melting temperature, change the type and amount of cleaning fluid, or modify the glass composition to reduce the melting viscosity and interfacial tension.