Preparation method of pellet film coating

According to the technical scheme, a roller is provided with a plurality of long-strip-shaped through holes which are formed in the circumferential direction of the roller at intervals, the length of each long-strip-shaped through hole ranges from 8 mm to 20 mm, and the width of each long-strip-shaped through hole does not exceed 1.2 mm. The pellet can perform complex track motion along the length extension direction of the long-strip-shaped through hole without blocking the hole, and the size of the long-strip-shaped through hole ensures the heat transfer rate, so that a coating medium sprayed on the surface of the pellet is quickly and uniformly dried to form a firm and smooth surface film. 本发明提供一种改进的应用于微丸包衣的高效包衣机，具体包括如下技术方案：所述滚筒上具有沿所述滚筒的圆周方向间隔排列的多个长条形通孔，长条形通孔的长度为8-20mm，宽度不超过1.2mm，如此，微丸能够沿着长条形通孔的长度延伸方向进行复杂的轨迹运动，不会堵塞孔眼，且长条形通孔的尺寸保证了热传递的速率，使喷洒素丸表面的包敷介质得到快速均匀的干燥，形成坚固光滑的表面薄膜。