In the production of bone china tableware, the effect of grouting production on environmental temperature and humidity

Grouting is a molding method with wide adaptability and high production efficiency. Anything with complex or irregular shapes that cannot be molded by other methods and thin tires can be produced by grouting. However, due to the temperature and temperature Molding has a great influence, which is directly related to the quality and survival rate of semi-finished products. Therefore, it is necessary to strictly control the environmental temperature and humidity and take corresponding measures for seasonal changes during production. 1. Requirements for environmental temperature and humidity. The operating temperature of the grouting sanitary porcelain white porcelin dinnerware is generally controlled at 25℃-37℃. The temperature at night can be increased, but it should not exceed 50℃, because the outer surface of the green body will dry too quickly if it exceeds 50℃. The drying speed of the inner surface of the blank is relatively slow, which causes uneven shrinkage of the blank during the drying process, resulting in cracks in the drying process. Moreover, the shape of the plaster mold is complex, and the dry humidity of each part is uneven. During the molding process, it is easy to cause defects such as too fast eating and increased porosity of the green body after molding. The operating temperature in the molding is generally controlled at 50-70%. If it is high, the drying speed of the green body will be too slow, which will affect the normal progress of the next process. If the green body is too low, the drying speed will increase, and the shrinkage speed will also increase, which is prone to cracking, especially for products with complex molding. severe. 2. The requirements of the grouting body for the seasons. The quality of the green body formed by grouting is sensitive to seasonal changes, especially the spring and autumn seasons have the greatest impact on green body forming, because the wind is relatively strong in spring and autumn, and the air is relatively dry. Under such conditions, if reasonable measures are not taken, The green body causes a large area of u200bu200bwind cracks in the forming stage, which seriously affects the yield of the green body. The main reason is that the wind cannot blow evenly to all parts of the green body, causing uneven drying of all parts of the green body, and local shrinkage too fast and cracking. Therefore, the problems that should be paid attention to during the spring and autumn seasons are: 1. The molding workshop cannot open the windows and doors. Curtains should be hung to prevent the outside wind from directly blowing on the inner body. If necessary, the blanks can be covered with film. , So that the shrinkage is uniform during the drying process. 2. In spring and autumn, spray some water around the molding operation frequently. The purpose of spraying water is to increase the humidity inside. The amount of spraying water is required to spray less at the beginning of the spring and autumn seasons, and gradually increase, and slowly decrease when approaching summer and winter, but pay attention to spraying less or even not spraying on cloudy and rainy days. The summer wind is relatively small and the humidity is relatively high. You can open the windows without spraying water inside. In winter, the windows must be sewn and glued to ensure the internal temperature. Therefore, as long as we take corresponding protective measures according to seasonal changes and control the temperature and humidity in the production environment during the production process, it is very beneficial to improve product quality and yield.
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