Fette Compacting America

TABLETING TECHNOLOGY IN DETAIL - TURRETS

The turret is the heart of any rotary tablet press. Basically, it plays a truly supporting role as almost all of the essential components are installed at the turret. The output of a tablet press therefore significantly depends on how many drill holes can be accommodated on the die which is in turn part of the turret. Because production space is expensive in the pharmaceuticals industry, the aim is to reach the highest possible yield per floor space.

Apart from the die table through the holes of which the powder mixtures flow, the so-called filling cams are also an integral component of the turret. The filling cams mechanically steer the punch movements helping to ensure that the tablets are pressed precisely. The unusual feature is that each product or type of tablet requires a different cam course. When users wish to manufacture single- or double-layer tablets, for example, or if they wish to press non-granulated powder directly, they require different filling cams and sets of punches for each process.
As there is a tendency toward smaller batches and faster product changes, and some contract manufacturers are even obliged to manufacture a different product every day on the same plant, the ability to refit presses fast is a decisive factor for modern tablet production. With the development of a changeable die table and especially thanks to segment technology which no longer involves replacement of full dies but rather only pitch circles, Fette Compacting has already significantly reduced the refit times associated with tableting.

But even if turret changes have become essentially simpler in the past few years, replacing the turret still necessitates releasing numerous screws, detaching connections and removing other components from the compression chamber. What's more, users with less experience often have difficulty putting the turret packs and filling cams back together again.