Degussa Aktiengesellschaft

Evonik Operations Gmbh

Jürgen Kreutz

Maik Grebe

Wolfgang Diekmann

Thomas Hasskerl

Ralf Richter

Sigrid Hessel-Geldmann

Günther Ittmann

Harald Häger

Wolfgang Stuber

Klaus-Dieter Schübel

Wilhelm Wolff

A process for melting/sintering powder particles for layer-by-layer production of three-dimensional objects is performed by a) applying a layer of a powder material solidifiable under the action of electromagnetic radiation, b) heating the powder material to not more than 10 K below the melting point according to DIN 53765 by a radiation from a heat-radiating element whose maximum radiation intensity is at a wavelength of 5000 nm or at longer wavelengths, c) selective melting/sintering of at least a region of the powder material which corresponds to the cross section of the three-dimensional object, d) repeating steps a) to c) until the three-dimensional object is obtained.

Process for melting/sintering powder particles for layer-by-layer production of three-dimensional objects

The present invention relates to plastic molded bodies having two-dimensional or three-dimensional image structures produced in the interior through laser subsurface engraving. The plastic molded bodies are made of plastic materials which have a content of nanoscale metal oxides having particle sizes from 1 to 500 nm, both the plastic material and also the included metal oxide being transparent to the laser light used for producing the image structures. The plastic materials from which the molded bodies are manufactured particularly contain metal oxides having particle sizes from 5 to 100 nm at a content of 0.0001 to 0.1 weight-percent. Typical metal oxides are nanoscale indium-tin oxide or antimony-tin oxide.

Plastic molded bodies having two-dimensional and three-dimensional image structures produced through laser subsurface engraving

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Marl, Germany

Jürgen Kreutz