Wedge press
Wedge presses were traditionally used to extract oil from seeds in oil mills . At the end of the 19th century they were almost completely replaced by hydraulic presses .
Historic oil mills were originally watermills in the German-speaking area . They consisted of a seed pounding machine, a roasting kettle and a so-called mallet wedge press . The process of extracting oil has been known as oil hammering . The oil miller was often called the oil hammer .
Structure and functionality
A wedge press consists of a box, the press plates, between which the filled press bags are located, the strong iron plates, the ribs and the wedges. By hitting the wedge, all parts in the box are pushed together and pressed out.
The oil drains through the holes in the plates and is collected. By hammering in the wedge, all parts loosen for removal.
In many cases, the effect of the presses is significantly supported by heating the pressed material, sometimes possible on its own (stearin, lead pipe, cloth press, etc.). The heating is then usually carried out by making the press plates or press baskets double-walled and allowing steam to enter the cavity.
Individual evidence
- ^ Moritz Rühlmann: Contribution to the history of the oil mills . In: Mittheilungen des Hanover Trade Association, 1875 p. 164
- ^ Monastery mill museum Thierhaupten: Oil mill . Website of the Museum Thierhaupten, 2020
- ↑ Berthold Moog: The oil mill . In: Mühlenbrief No. 10, October 2007 , ed. from the Association of Swiss Mill Friends.
- ↑ The oil miller . In: Professions der Welt , ed. by S. and M. Sallmann.