Method and device for producing 3d shaped parts using layering technology, and controllable powder roller

A method for producing one or more three-dimensional parts comprising the steps of:

• applying a layer of a particulate material onto a construction field with a recoater, the recoater having a controlled heater for heating the particulate material in the recoater, wherein the particulate material is characterized by a sintering temperature and a recrystallization temperature is applied by generating a particulate material roll in a coating direction;
• selectively applying an absorber to one or more areas of the layer with a print head, and
• fusing the areas with the absorber by an energy input component,
• wherein these steps are repeated until the one or more three-dimensional parts are obtained,
• wherein the method includes independently
• i) heating and controlling the particulate material in the recoater to a temperature of 70° C. to 155° C. with the controlled heater;
• and
• ii) heating and controlling the particulate material on the construction field to a temperature of 155° C. to 180° C. by the energy input component during the repeated layer application onto the construction field;
• wherein the absorber causes the particulate material printed with the absorber to reach a temperature such that said particulate material begins to sinter and thereby bond, while the particulate material without the absorber is maintained above the recrystallization temperature and below the sintering temperature and does not sinter;
• wherein a dimension of the particulate material roll is maintained by the discharge of particulate material from the coater while the coater is moving and/or the dimension of the particulate material roll is maintained within +/25%;
• wherein the layer has a generally constant thickness, preselected in a range of 0.05 to 0.5 mm.