TABLETING
T TACKLING Fig. 1
Barbara Fretter & Michael Schupp ask whether tamp auger is a misleading name
AMP AUGER D
uring the dry granulation process (Fig. 1), material is densified between two counter rotating press rolls – the core of a roller
compactor. Material is conveyed by the dosing system to the rolls, but the dosing system is not responsible for the material movement during densification. Te press rolls draw the material towards the gap (the smallest distance between the press rolls), and the draw-in is based on frictional forces between material and press rolls (Fig. 2).
Sometimes the influence of several feeding unit settings on ribbon or granulate properties is examined and additionally, it is stated that the feed auger speed is a main process variable. In principle, this is not correct. Te feed auger is responsible for conveying the powder to the gliding area and the rolls. In general, the larger the feed auger speed, the more material will be transported. Te applied specific roll force, the powder densification properties and the amount of powder conveyed to the rolls and by the
Roller compactor with its three major units: feeding system (1- 4), compaction unit (5) and size reduction unit (6)
Fig. 2
Fig. 3 (a) Process diagram of GranuLac 200 for specific roll forces between 3 and 12 kN/cm and 2 rpm roll speed
Densification during roller compaction
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Fig. 3 (b) Process diagram of GranuLac 200 for specific roll forces between 3 and 12 kN/cm and 2 rpm roll speed
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