The focal point with the ‘dry pressing’ operation is the single-axis and isostatic nature of this process. This involves finely granulated ceramic powder being filled into a pressure mold with a small amount of organic bonding agent. In the two-sided pressing operation, parallel movement of the top and bottom cylinder compresses the granulate. In the one-sided pressing operation, pressure is only applied from above.
Due to the lower proportion of bonding agent, the ‘debinding agents’ needed with injection molding are not required. This makes the baking or curing process somewhat less costly. The substantially lower proportion of bonding agents and the absence of corresponding anti-friction agents do however impose limits on the geometric complexity of components and can also give rise to enormous differences in pressure in the component. If these intrinsic stresses cause distortion during the sintering process, this needs to be adjusted back again by a commensurate amount of mechanical rework (i.e. machining).