粘土砖坯的干燥过程,实质上就是脱水的过程,随着脱水而完成全部收缩的过程。坯体中所含的水,大体上可划分为两大部分:一部分是化学结合水,加热到500℃左右时,才转化成水被排出,它并不引起砖坯体积的变化。粘土在成型前要加水以达到一定的塑性才能挤出成型(或半干压),因而在粘土颗粒的表面都包有一层水膜,成型含水量越高水膜总表面 The drying process of clay brick is essentially the process of dehydration, and the process of complete shrinkage is completed with dehydration. The water contained in the green body can be roughly divided into two major parts: one part is chemically bound water, and when it is heated to about 500[deg.] C., it is converted into water and discharged, and it does not cause a change in the volume of the brick. Clay must be filled with water before molding to achieve a certain degree of plasticity before extrusion (or semi-dry pressure), so the surface of the clay particles are covered with a layer of water film, the higher the water content of the molding water film total surface