3 results about "Grain structure" patented technology

Traditional ceramic tile pressing is one-step pressing, a front surface of a ceramic tile green body is a smooth plane, and a back surface of the ceramic tile green body comprises concave-convex grains, uneven density and uneven and unsmooth surfaces can be caused inevitably, a ceramic tile die with functions of two-time material distribution and two-time pressure application is adopted, the die is arranged above a tile green body conveying table on one side of a press, during first-time material distribution and pressure application, the die is cushioned on the lower part of a fixing upper die core, during pressing, the tops and bottoms of tile green bodies are subjected to planar compression, densities are consistent, then powder distribution and then pressing of a back grain layer are carried out, the influence on the densities of the green bodies which have been pressed on a first layer is reduced by controlling thickness and pressure value, when the ceramic tile green bodies are sintered and formed, ceramic tile powder on a surface layer retracts in a balanced manner at the consistent density so that the surface is smooth and flat, a bottom grain layer retracts at inconsistentdensity, but inconsistency only reflects on a grain surface but does not affect the surface, and purposes of enabling surfaces of ceramic tiles to be flat and enabling back grain structures to be powerful are achieved effectively.