Method for forming tablets and a roll press type apparatus thereof

摘要

A method for forming tablets using a roll press type apparatus for forming powdery material. The apparatus comprises two rolls for compressing tablets, wherein the rolls have a cylindrical shape and are arranged in the same direction, and can rotate toward their inner sides. When only one of the rolls has the plurality of cavities for forming tablets that are disposed on its outer surface, the speeds of their outer surfaces are controlled so that the speed of the roll that has the plurality of cavities on its outer surface is slower than that of the roll that has no cavity. Further, when both rolls have the plurality of cavities forming tablets that are disposed on their outer surfaces, the speeds of their outer surfaces are controlled so that the speeds of the rolls differ. Consequently, tablets that have a high dimensional accuracy and no burrs formed around them can be produced.

主权项

1. An apparatus for forming a powdery material into tablets, comprising:
two rolls for compressing powdery material to form the tablets, wherein the rolls have a cylindrical shape and are arranged in the same direction, and can rotate toward their inner sides, wherein both rolls have a plurality of cavities for forming tablets, which are disposed on the outer surfaces of the rolls, means for rotating the rolls, means for controlling the speeds of the outer surfaces of the two rolls so that the speed of the outer surface of one roll of the two rolls is faster than the speed of the outer surface of the other roll of the two rolls, whereby each roll having the plurality of cavities acts as an independent device for forming the tablets of the powdery material, and an auxiliary roll having a cylindrical shape disposed on the surface of the one roll, that rotates faster than that of the other roll, wherein the auxiliary roll is arranged in the same direction as that of the one roll, and means for rotating the auxiliary roll so that the speed of the outer surface of the auxiliary roll is faster than the speed of the outer surface of the one roll, wherein the auxiliary roll is arranged so that the outer surface of the auxiliary roll faces that of the one roll and rotates in the opposite direction of that of the one roll.