Several solutions are available to make sure the pressed components are not damaged or deformed during ejection.
(1) Hold-up / hold-down system:
This system prevents tablet lamination or capping due to a sudden pressure release during tablet ejection. A set of pneumatic cylinders can be adjusted in height, angle and force and maintain a force on the tablet during tablet ejection, which can be essential for ejection at high tableting speeds. The pressure can be identical in all cylinders or - optionally - set individually. All pressures are controlled by proportional valves and set on the operator interface.
(2) Mitigating the impact of high ejection forces:
When GEA punch holders with bearings rolling on cams are used, ejection forces up to 10kN can be sustained without excessive wear and tear.
(3) Die wall lubrication:
As a rule, lubricants enabling smooth ejection are blended into the powder. However, for some applications this is not an option, because most solid lubricants reduce tablet hardness or contaminate the powder. An alternative to adding a lubricant to the powder blend, the die wall lubrication system deposits a thin oil or grease film on the die wall to ensure smooth tablet ejection. A complete solution is available to control the amount of lubricant on the die wall.
(4) Punch face lubrication:
When punch face sticking is a problem, a magnesium stearate film can be deposited on the punch faces.
(5) Tablet take-off system:
The tablet take-off replaces the standard tablet chute and is a great feature for removing fragile tablets from the press and/or bringing tablets on a single line for further processing.