What Is Dry Granulating Machine?

Writer： admin Time：2021-05-19 09:39 Browse：℃

After one-step granulating technology, dry granulating technology (also called roller compacting )is also developed. It is also a kind of environment-friendly granulating technology and widely applied in pharmaceutical industry especially to granulate material which is sensitive to moisture and heat or easy to block.
 
1. Working principle of roller compactor
Material is dosed by a vibrating hopper and a transverse auger feeder and fed into the main hopper. Its level in the main hopper can keep constant. Then the longitudinal cone of the main hopper can pre-compress the material spirally and convey it to the curved notch of two pressing rollers. Semi-oblate arc grooves or rhombus with the same shape are evenly distributed on the surface of the two rollers. A pair of gears mesh with each other to make the two rollers rotate reversely at constant speed. Therefore, the material at the notch can be fed into the groove and compressed instantly. After compression, pressure on the material reduces while it falls to the sieving system due to elasticity and gravity. In this system, the material will be screened. At last, granules with qualified granularity are produced and remaining powder will be recycled.