Coating is defined by covering with a suitable substance. Products are coated to be protected from light, humidity, oxygen or mechanical stress, to become a smooth surface or to be soluble. The coating solution must be suitable in order to properly cover the surface of the particles solids. The effects desired by coating depend among others on the degree of accumulation to the surface. A 100 % coated surface has different effects than a partly covered one.
For coating process, it must need high speed movement of product in mixer drum and evenly liquid spray onto the surface of solid particles. The high rotation speed of the mixing elements and the use of choppers can support the distribution quality. Ploughshare Mixer is frequently used in coating process because of it’s high speed rotation and choppers can also be helpful for better coating which will spread the agglomerate during coating solution spraying.