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The use of a Novel Roller Compactor with a Concavo-Convex Roller pair to Obtain Uniform Compacting Pressure

1977; Taylor & Francis; Volume: 3; Issue: 6 Linguagem: Inglês

10.3109/03639047709055633

1520-5762

Yoshiro Funakoshi, Tatsuo Asogawa, Eiichi Satake,

Rheology and Fluid Dynamics Studies

The factors affecting the distribution of compacting pressure during the process of dry granulation with a roller compactor, have been elucidated experimentally.Lactose powder was used with incorporation of a small amount of riboflavine as a pressure indicator.The rollers used in this study had been designed as a concavo-convex pair that exactly keep their mutual fit while rotating. The flanges formed by the concavity of the concave roller at its both ends, called "rims" in this paper, were subjected to several experimental variations in the angles of wall siopes, namely, 45°, 65°, 75°, and 90°.These inclined gripping walls acted as compensators, cancelling the resistance in the powder flow due to the side seals attached to both ends of the rollers.The overall effect was that the pressure of compaction was adjusted uniformly over the whole width of the rollers, and the best result was obtained at a rim angle of 65°.In this experiment, however, a rectangular-aperture chute, when equipped at the delivery end of the screw feeder, contributed little to the uniformity of pressure distribution in compaction.From these observations, the authors have established a new type of roller compacting system that is superior, in the sense of uniformity of compression, to any conventional roller compactor.