Process for the production of a three dimensional system

A process for production of three dimensional objects in a construction chamber, comprising:

• inertizing the construction chamber by admission of an inertizing gas or inertizing gas mixture which is unreactive with process components under process conditions;
• wherein
• a density of the inertizing gas or inertizing gas mixture is higher than the density of air, and
• the production process comprises a layer-by-layer method, comprising:
• supplying a first layer of a pulverulent material to the construction platform of a construction chamber;
• inertizing the construction chamber with the inertizing gas or inertizing gas mixture;
• selectively melting the pulverulant material according to a pattern for the three-dimensional object;
• allowing the molten pulverulant material to solidify in the pattern of the three-dimensional object;
• adding a further layer of a pulverulent material to the first layer containing the solidified material of the pattern;
• inertizing the construction chamber with the inertizing gas or inertizing gas mixture;
• selectively melting the further added layer of a pulverulant material in the pattern of the three dimensional object;
• allowing the molten pulverulant material to solidify onto the solidified material;
• and
• continuing the addition of the pulverulant material, inertizing the construction chamber, selective melting and solidification according to the pattern of the three dimensional object until a three dimensional object of the pattern is obtained;
• the production process further comprising:
• inertizing the pulverulent material in a feed container prior to supply to the construction chamber.