Sigri Gmbh

Sgl Technik Gmbh

Sgl Technik Ag

Ernst Tetzlaff

Manfred Schmid

An extruder forms shaped bodies from plastics-filler mixtures having a filler content of more than 50% by volume. The extruder comprises a product feed device, an outer mouthpiece and two barrels arranged coaxially between the product feed device and the outer mouthpiece. The first barrel (input cone) having an inside wall provided with grooves essentially parallel to the longitudinal extent of the barrel is connected with the product feed device. The second barrel (output zone) is connected with the outer mouthpiece. A screw arranged in the first barrel conveys material into the second barrel. Separate tempering arrangements for the first barrel, for the second barrel and for the mouthpiece control the desired operation temperatures in the extruder. Preferably, the extruder additionally includes a mandrel connected with the screw and arranged in the second barrel.

Extruder for manufacture of shaped bodies from plastics-filler mixtures

A method for the manufacture of shaped bodies by extrusion moulding of plastic-filler mixtures with filler contents of more than 50% by volume, preferably from 65 to 90% by volume, by means of an extruder with a conveying input zone. The method is restricted to use of fillers having good thermal conductivity. For carrying out the method, initially a mixture is manufactured from molten or fluid synthetic resin and the filler and this is ground and graded after cooling. Afterwards, there is extrusion of the ground mixture or of fractions separated from this and graded. According to a preferred variant of the method, an extruder is used for the extruding having a conveying input zone whose extrusion part consists merely of an input zone and an output zone. According to a further variant of the method, plates are manufactured by cutting up lengthwise a tubular extrusion emerging from the mouthpiece in the extruding and the casing of the extrudate thus obtained is bent flat and this extrudate is then cut up into plate lengths.

Method for the manufacture of shaped bodies formed from plastics-filler

Manufacture of vitreous carbon bodies in which thermoplastic materials containing aromatic groups are formed into bodies, are thermally stabilized by irradiation with ionizing radiation and are carbonized by heating them in an inert atmosphere.

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Heidenheim, Germany

Ernst Tetzlaff