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Stage 1 Filling: Top punch is withdrawn from the die by the upper cam Bottom punch is low inthe die, so powder falls in through the hole and fills the die. The punch-die cavity is made of dieand lower punch. Then the position of lower created the volume of the cavity. This volume isappropriately adjusted for the weight of granules to be compressed to make the tablets.
Stage 2 Metering: Bottom punch moves up to adjust the powder weight-it raises and removethe excess granules from the compression machine. At this stage, the required weight (volume)of the granules to be compressed into tablets is controlled by the height of the lower punch inthe die and the height of the lower punch is controlled by the fill cam.
Stage 3 Compression: Top punch is driven into the die by upper cam Bottom punch is raisedby lower cam Both punch heads pass between heavy rollers called compression roller tocompress the powder. The compression rollers push the punches towards the die to form theproduct.
Stage 4 Ejection: Top punch is withdrawn by the upper cam Lower punch is pushed up andexpels the tablet is removed from the die surface by surface plate.
