corner area(In the Diamold design, the entire mold face and corner area of the upper part of mold is provided with a strong taper whereas the corners in the lower part of the mold do not have any taper. 在钻石形结晶器设计中,结晶器上部的整个内面和角部区域具有很大的锥度,而结晶器下部的角部区域则没有锥度。)