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我厂使用450型双级真空挤出机,挤出压力1.5～2.0MPa.真空度O.08～O.09MPa,生产孔洞率为20%的KPl型承重空心砖.粘土原料塑性指数为11～13,成型含水率15%～19%,粘土经陈化和破碎处理.采用传统的自然干燥,湿坯密码,人工花架.我厂产品外观及内在强度均十分理想,但是,在干燥过程中最底层砖坯出现大量裂纹,表现在整架底层坯体与地面接触的条面产生贯通厚度方向并向上条面方向沿伸的裂纹.裂纹宽度为2～5mm,长度为10～50mm不等,裂纹位置均位于坯体中部(见图1).底裂造成的废品率高达15%～2O%,给企业造成极大损失.
Our factory uses a 450-type double-stage vacuum extruder with an extrusion pressure of 1.5 to 2.0 MPa, a vacuum degree of 0.08 to 0.09 MPa, and a KP1 bearing hollow brick with a porosity of 20%. The plastic index of the clay material is 11 to 13 , Molding moisture content of 15% to 19%, clay by aging and crushing process. Using the traditional natural drying, wet billet password, artificial flower rack. Our plant product appearance and internal strength are very satisfactory, but the lowest level in the drying process There are a large number of cracks in the brick, which occurs when the entire bottom slab contact with the ground produces cracks that pass through the thickness direction and extend along the direction of the upper strip. The crack width is 2 to 5 mm, and the length is 10 to 50 mm. The crack location is Located in the middle of the body (see Figure 1). The rate of scrap caused by the bottom cracking is as high as 15% to 20%, causing great losses to the company.