What factors affect the whiteness of high-white glass wine bottles?

High white material in glass means that the glass has good whiteness and high transparency. But do you know what factors affect the whiteness of high-white glass wine bottles? In addition to the proportion of ingredients and the quality of raw materials, the whiteness of Wuhan NEWRAY glass wine bottles will also be affected by other factors. Next, our article will focus on introducing you to 5 other reasons that affect white glass bottles and jars.

1. Melting temperature

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When the iron content and selenium powder dosage are constant and the melting temperature is increased, the decolorization quality of the glass will decrease. The reason is that increasing the melting temperature will cause selenium powder to volatilize and increase the dosage. According to actual experience, when the melting temperature is above 1450°, the dosage of selenium powder will increase by about 5% for every 10°C increase.

2. Annealing temperature

If selenium powder is used to decolorize glass, if the annealing process is not well controlled, the product quality will be affected and even discoloration may occur. A glass bottle manufacturer previously discovered during the production process that the glass bottles were light rose red after annealing, but the bottles on the mesh belt conveying the bottles did not have this color without being taken directly through the annealing furnace. Later, after searching for the cause, it was found that the temperature of the annealing furnace was too high. The discoloration disappeared immediately after the temperature was adjusted to the normal annealing temperature. Therefore, the temperature of the annealing furnace must be tested on time during production, otherwise fuel will be wasted and the quality of the bottle will be affected.

3. Fuel properties

An important part of the production of high-white glass is fuel in addition to raw materials. Many glass bottle factories use electric furnaces or natural gas to reduce contamination of the glass liquid. However, some companies have used floor oil and crude oil in order to reduce costs. Because floor oil contains 0.3% ash, the ash contains iron oxide, and the water content in the oil is too high, resulting in unstable oil pressure and short and long flames. , the color of the material has been unstable, and the decolorizing agent must be adjusted frequently, which brings many adverse effects to production.

4. Kiln atmosphere

From the perspective of the decolorization principle of glass, the oxidizing atmosphere in the kiln is conducive to the conversion of fe2+ (iron ions with two positive charges) with strong coloring ability into positive ferric ions with weak coloring ability under the action of the oxidant, thus strengthening the Depigmentation. At the same time, the amount of selenium powder used is reduced and the cost is reduced. However, when the oxidizing atmosphere is too strong, the purple elemental selenium will be oxidized into colorless selenium dioxide, which will weaken the decolorization ability. Generally, it is advisable to control the atmosphere in the kiln to be a weak oxidizing atmosphere.

Combustion air volume, batch material moisture, fuel properties and atomization air pressure will all have an impact on the kiln atmosphere. According to actual experience, when natural air intake is used or the air volume is small, the furnace atmosphere fluctuates greatly and is easily reducible, which will reduce the sulfur dioxide and sulfur trioxide in the glass to sulfide, and then react with the iron and selenium in the glass material to produce sulfide. Iron and sulfur selenide, thereby reducing the whiteness of the glass. Turn on the combustion-supporting air volume to the maximum to make it highly oxidizing, avoiding the defects of large gas furnace atmosphere fluctuations and strong reducing properties, and the material color effect is pure and stable.

5. The impact of output

When the discharge volume decreases, the volatilization of selenium powder increases due to the extended time of the batch materials in the tank kiln. Therefore, when the discharge volume increases, it is conducive to the color development of the selenium powder. A stable discharge volume is conducive to stable decolorization. When the discharge volume When the amount fluctuation is no more than 5%, the effect on decolorization is small, and there is no need to adjust the amount of decolorizing agent. Previously, a glass bottle company had a machine problem during normal production. One of the three in-line machines was replaced. As a result, the material output was reduced within a week, and the color of the material turned green. Some liquor bottles that were originally very white and glass bottles turned green, and customers thought they were not produced by the same manufacturer. This was the result of excessive volatilization of selenium powder.

Newray achieves fully automatic feeding and replenishing through the whole set of equipment, and cooperates with 24-hour uninterrupted manual monitoring to monitor and adjust the entire production process in real time. When problems are found, they are solved in the first time and defective products are eliminated, so as to achieve 100% qualified product delivery to customers.