Use the batch value to manage the characteristics of the glass bottle

Generally speaking, to adjust the color to the ideal state, at least one shift is required, and the effect will be produced in about 8 hours, which means that the color of the bottle of at least one shift is not ideal. In addition, it is not the increase or decrease of the amount of pulverized coal in the formula, which will surely give satisfactory results. Because there is no theoretical basis for increasing or decreasing the amount of pulverized coal, it is only adjusted according to past experience. Sometimes the amount of adjustment is not in place. It is inevitable that the increase is not enough or overkill. Once and for all, it is often a waste of a few days to adjust the color of the bottle. Since the production of glass from the preparation of the batch material to the production of the finished glass product needs to be separated for a period of time, that is, there is hysteresis, therefore, the amount of coal powder in the formulation is adjusted according to the color of the finished product, and the color of the bottle produced under this control method fluctuates. Larger, unstable tones, the limitations are obvious.

Using the redox number of the batch to control the color In order to solve the drawbacks of large fluctuations in the color of the bottle, to maintain the stability of the finished color, and to change the limitations of the resulting source of control, we must find an effective method that can be used from the production process. At the beginning of the formulation of the batch, the color tone of the finished product is determined, and the source to the result is controlled by the cause and effect. In the actual production process, the color of the finished product can be basically stable regardless of the formula.

The glass melt must be in a certain weakly reduced state. The raw materials constituting the glass batch material, such as Glauber's salt and barite, are oxidizing. Although the organic matter or carbon material contained in other raw materials acts as a reducing agent, it cannot meet the requirements of weak reducing property of the batch material, and often needs to be To add carbon with strong reducibility to the batch, we use the carbon in the coal powder to achieve the purpose of introducing the reducing agent. In order to control the degree of weak reduction of the batch, we mainly consider the ratio of four kinds of raw materials such as quartz sand, barite, mirabilite and coal powder, and the amount of molten glass per compound to the redox number of the batch. Impact. By consulting the relevant literature, combined with the actual production of the factory, the appropriate empirical formula for calculating the redox value and controlling the redox number is determined (the unit in the formula is kg).

Since each Redox number corresponds to a color, in order to get the amber color we need, in the actual production process, we collected 30 pieces of materials that have been obtained before and are satisfactory to customers with a charming amber stable color. Fang (the amount of coal powder in these 30 materials has more or less adjustment process, the useful data is the data of the amount of coal powder obtained after adjustment to obtain the ideal color), using the visual sensation of the human eye, according to The shades of the glass bottles are divided into three groups: brown red, light brown, brown red and brown red. The corresponding Redox numbers and the average Redox numbers of each group are calculated as the routines in our daily routine. The allowed range of standard Redox numbers used.

In calculating this standard Redox number, we first calculate the amount of various raw materials required and the amount of molten glass melted per compound by the basic glass composition, and then according to the allowable range requirements of the standard Redox number. The amount of Glauber's salt and pulverized coal is adjusted in a small amount so that the Redox number of the batch meets the requirements to ensure that the finished product can obtain a predetermined stable color tone. Of course, all calculations use the powerful computing functions of Microsoft Excel, which not only is fast, but also saves a lot of cumbersome calculations, especially the high accuracy, which can ensure the accurate and effective calculation results.

According to the coloring mechanism, the iron content in the batch is also a very important factor affecting the coloration. Therefore, in the above method of controlling the color of glass by using Redox number, a very important basic condition is that the total amount of iron in the batch material is maintained in the range of 0.18%-0.24%. Since 60% and 80% of the iron in our existing formula comes from purchased cullet, the fluctuation of the quality of purchased cullet and the incorporation rate in the batch obviously affect the total iron content of the whole batch. The change. In order to stabilize the change of the total iron content of the batch material and effectively use the Redox number to control the color, we take corresponding measures to ensure the quality of the purchased cullet, so that the total iron content of the batch material can be kept at this range or even lower. Provide a safe and effective operating platform for color control.

(Finish)

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