Methods: the optimum preparation condition were researched by orthogonal test according to the hardness of drop pills, appearance, smooth and the content of silybin.
The increasing pressure leads to the drop in hardness.
随着压力的增加,材料的硬度下降。
3
Surface hardness, hardness along the depth and the degree of layer looseness are all Superioors than the conventional drop-feeding process with methanol and ammonia.