A method for the multi-stage compression of a mass in a press, especially an extrusion press containing plastic or elastic masses. The mass to be extruded is precompressed up to a preliminary pressure by the rapid advance of the pressure piston. The initial advance takes place at a high rate without...http://www.google.es/patents/US4335063?utm_source=gb-gplus-sharePatente US4335063 - Method and apparatus for pressure control in a press
Method and apparatus for pressure control in a press
