Method and device for producing three-dimensional objects using laser technology and for applying an absorber using an inkjet method

An apparatus for layer-by-layer production of a three-dimensional object, the apparatus comprising:

• a movable apparatus for layer-by-layer application of at least one pulverulent substrate to an operating platform or to a previously applied layer of a treated or untreated pulverulent substrate which may be present on the operating platform;
• an apparatus movable in the x, y plane configured to apply a material comprising an absorber that absorbs laser radiation having a wavelength within a range from 100 to 3,000 nm, and optionally at least one other additive, to selected regions of a layer of the pulverulent substrate;
• and
• an energy source comprising a laser emitting radiation having a wavelength within a range from 100 to 3,000 nm,
• wherein:
• the energy source is an unfocused laser beam directed to an entire powder surface applied to the operating platform or to the previously applied layer;
• the unfocused laser beam is directed to the entire powder surface at an irradiation velocity from 10 to 10,000 mm/s;
• and
• the laser is a diode laser in which the unfocused laser beam includes beams having a rectangular area.