Brim volume of coating pan and the bulk density determine the capacity of tablet coating machine.
For coating uniformity capacity calculation of tablet coating machine is necessary. Quantity of tablets used for coating plays great role to get predetermined coating specification. If coating process performed without coating machine capacity calculation then different coating problems may occurs. So that affected the product quality.
Working capacity of coating pan is determined by brim volume of the coating pan. It is mentioned in the manual of the coating machine. Brim volume defined as the volume of water when coating pan is fully filled in situate its current position. Total volume of pan is different from brim volume.
Maximum capacity of tablet coating pan is calculated by the brim volume of pan and bulk density of tablet.
Coating pan capacity calculation formula
Maximum capacity of coating pan (Kg) = Brim volume of pan (ltrs) x Bulk density of tablets (g/ml)
60% of the maximum capacity is the minimum capacity of coating pan.
Coating pan size 48”
Brim volume 160 ltrs.
Bulk density of tablets 0.72 g./ml
Maximum capacity of coating pan = 160 x 0.72 = 115.2 Kg
Minimum capacity of coating pan = Brim volume of pan (ltrs) x Bulk density of tablets (g/ml) x 60/100
Minimum capacity = 160 x 0.72 x 60/100 = 69.12 Kg
Bulk density depends on the tablet shape and size. Small tablets of same formulation have higher bulk density in the compression of large tablet. So that maximum and minimum capacity of coating pan (48”) will different if the shape and size of tablets are different.