| 摘要 |
The device comprises a trough (1) and a stamp (3) for pressing the raw material (2) in the trough, in which the stamp has a projecting rib formed on the peripheral edges (4). The ribs are arranged around the peripheral edge over the other. The bottom of the plunger is formed in hollow dome-shape. The trough and the stamps have a circular cross-section. The trough and the stamp have a shape deviating from the circular, oval, square or rectangular cross-section. |
