With smooth trimmed surface of insole backpart stable trimming quality and high production.

中底踵切削面平滑均匀，品质稳定，产量高。

Its advantages include high purity of carotin crystal, low acidity of the oil solution of carotin and stable quality.

本发明获得的胡萝卜素晶体纯度高，胡萝卜素油溶品酸价低、质量稳定。