Uhde Gmbh

Messer Griesheim Gmbh

Uhde High Pressure Technologies Gmbh

Heribert Dierkes

Jorg-Peter Korner

Zeljko Knez

Thomas Berger

Hans-Ottomar Kurtz

Peter Nünnerich

Volkmar Steinhagen

Rudolf Minning

Peter Saamer

Josef Hiltawsky

Henry Cohrt

Michael Bork

Christoph Lütge

According to a known method for producing a component by means of a powdery starting material, powder is mixed with auxiliaries comprising binding agents, whereby a free-flowing mass is produced. A green body is produced from the mass by means of powder injection moulding. A portion of the auxiliaries is extracted by heating the green body in a container and exposing said body to a stream of solvents. The green body is sintered, whereby the component is produced. The aim of the invention is to enable fast and gentle extraction for releasing green bodies which are produced by means of powder injection moulding. According to the invention, the extraction comprises a heating-up phase during which the temperature of the green body is permanently or gradually increased and the green body is overflown by solvent in the form of a compressed, supercritical treatment gas. An extractor that is suitable for carrying out said method is characterised by a pressure sealed housing that is provided with at least one lateral limiting wall and encloses a treatment chamber for receiving a carrier element which is loaded with a plurality of green bodies. Said housing is provided with a lock-up load and removal opening for the green bodies. Said opening is configured in the lateral limiting wall as a passage for the carrier element.

Method for producing a component by means of powdery starting material and extractor suitable therefore

A high-pressure generating apparatus including a high-pressure chamber, a low-pressure chamber located beneath the high-pressure chamber and having a diameter substantially larger than the diameter of the high-pressure chamber, a tandem piston having first and second portions displaceable in the high-pressure and low-pressure chambers, respectively, for building-up pressure therein, and a yoke embracing the high-pressure and low-pressure chambers for applying a pressure force to the high-pressure chamber cover and the low-pressure chamber bottom upon built-up of pressure in the high pressure and low-pressure chambers.

High pressure generating apparatus

The invention relates to a closure system for pressure vessels, the closure consisting of a cover and of two clamp halves each of which can be moved into closing or open position by means of guiding elements. The clamp halves, the cover, and the pressure vessel housing being equipped with stop surfaces, the stop surfaces of the clamp halves being opposite to those of the cover and of the pressure vessel housing in closing position. The closure system is especially suitable in cases where an entirely automatic closing device is required for pressure vessels having an operating pressure of more than 10 bar. The clamp halves are connected by means of tensible flexible bearings to guiding elements to allow for a cover movement in axial direction. The tension of the flexible bearings is sufficient for automatic resetting of the clamp halves into zero position after depressurization of the vessel.

Closure system for pressure vessels

The invention relates to a process for the manufacture of a rigid, essentially elbow-shaped coaxial double pipe with a hollow space between inner and outer pipes, consisting of an elbow-shaped cold-bent high-pressure pipe for operating pressures of over 1000 bar as the inner pipe, the two shanks of the elbow each comprising a straight piece of pipe with a length of at least 5 times the outside diameter, and an elbow-shaped cold or hot-bent outer pipe which envelops the inner pipe in a manner as to leave an annular space between inner and outer pipes and extending the length of the outer pipe, with the outer pipe enveloping the bend and one straight shank only. Elbow-shaped coaxial double pipes of this type can, for instance, be part of a heat exchanger of up to 3000 m in length in the form of a coil type cooler comprising a plurality of straight pipes and U-shaped bends.

Process for the manufacture of double walled pipe

Growing community of inventors

Hagen, Germany

Heribert Dierkes