Patent ID: 7981352

Claim:
A method for quality surveillance in manufacturing tablets in a rotary tablet press which, in a compression chamber, has a rotor with upper and lower rams, a die-plate, a cam system for the rams, at least one compressing station, and a charging system for the powdered material requiring compression wherein the tablets are checked for at least chemical and/or mechanical properties, characterized in that at least some chemical and/or mechanical data of the tablets is obtained by means of a NIR or LIF sensor in the compression chamber after the upper rams have left the dies, wherein the NIR or LIF sensor is stationarily disposed above the die-plate and above a graduated circle of the dies and a tablet to be checked is still within the die, and further wherein the data is obtained after a measuring procedure has been initiated by a machine computer in response to the die positions determined by a position generator relative to the NIR or LIF sensor, wherein, if the obtained data deviates from set-points, at least one closed loop system is triggered to optimize machine settings including one or more of speed of the rotor, speed of the charging machine, charging depth, height of tablet lands, and a measure of immersion depth of the upper and lower rams.