The Effect of Batch Preparation Technology on Its Quality

Abstract

The quality of batch-preparation process is estimated by determining the properties of sheet glass produced. Statistical research methods are used.The important parameters of the batch preparation technology are the steadiness and precision of the process [1]. The precision and steadiness of the process of batch preparation can be estimated based on the properties of its finished product, namely, clear sheet glass. Let us analyze the effect of the quality of the batch on glass density and optical distortion visible in transmitted light and measured by the Zebra method.To estimate the precision and steadiness of the technological process of batch preparation, an analysis of the variation in the density and optical distortion of the produced glass (Figs. 1 and 2) was performed at the Borskii Glass Works.The plot shows a linear trend indicating the deviation of density and optical distortion toward their increase. The reasons for this instability can be common or different. To identify these reasons we have constructed a dispersion field plot in the "optical distortions -glass density" coordinates ( Fig. 3). A significant correlation between the analyzed properties of glass produced (correlation coefficient R 2 = 0.37) corroborates the presence of common destabilizing factors.To identify factors affecting quality, we analyzed the quality parameters of a batch for glass melting. The quality of a finished batch in production is checked twice per shift by a lab technician of the central factory laboratory by taking a sample from each mixer. The monitored parameters are the batch temperature (35 -55°C), moisture (4.5 ± 0.5%), and deviation of the batch components from a prescribed composition (not more than ± 1.0%). The quality of the batch supplied for glass melting in the course of the year 2003 is characterized by the statistical data in Table 1.