Homogeneous Hydraulic press

In a laboratory kneading chamber polycarbonate (PC) of medium viscosity (e.g. Makrolon 2600, Bayer) is mixed with different amounts of highly structured carbon black (CB, e.g. Printex XE2 (Evonik), up to 10 wt% in steps of 1-2 wt%) at ca. 280°C with a suitable defined mixing rate tiU a homogeneous mixture is obtained (typically 5-15 min). The melt will be taken out of the mixing unit, cooled down, and flat plates of the composites are prepared by compression moulding at ca. 280°C between two planar steel plates by means of a heatable hydraulic press. To hinder sticking of the composite at the metal plates, the plates may be covered with a release film and a frame can be used as distance holder to control the sample thickness. 

Oil is extracted from the fruit of the olive tree, Olea europea, by milling to remove the pulpy flesh from the hard seed. The resulting paste then is (1) pressed in hydraulic presses that use disk filters ( capachestas ) (2) diluted with water, homogenized, and allowed to settle by gravity or (3) separated by using a... 

The hot, homogeneous mass is shaped in a hydraulically-operated extrusion press of the type used for smokeless powder (Fig. 121). It is usually cruciform. A guillotine cuts the extruded material to the required length. The outer surfaces of the limbs of the cross are covered by a substance which does not burn readily (e.g. strips of plasticized cellulose acetate or polystyrene 1.5-5 mm thick), and cemented in place, to prevent uneven burning at the surface. 

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