The sagger is one of the kilns. In the process of firing the ceramic, in order to prevent the destruction of the green body and the glaze of the gas and the harmful substances, the ceramic and the green body are placed in the container made of refractory material, and the container is called the sagger , Also known as box. The use of sagging pottery, not only can improve the amount of charge, the product will not be bonded, improve the yield, and sagger also has a certain thermal conductivity and thermal stability, can guarantee the quality of ceramics. The shape of the sagger varies according to the shape of the object. Sagger, is made of refractory mud material of a variety of round bowl, made by high temperature roasting. The sagger is one of the important kilns for the installation of porcelain. All kinds of porcelain billet, must first be loaded into the sagger, and then into the furnace roasting.