| abstract |
The present invention relates to a method for producing a resin sintered body. When a resin powder of a thermoplastic resin is sintered to produce a resin sintered body, uneven coloring regions on the surface can be eliminated, the surface of the resin sintered body can be uniformly and sufficiently colored as desired, and the resin sintered body can be The surface is in a smooth state with good appearance. The method is a method for producing a resin sintered body (1) by applying an ink (3) to a resin powder (2) of a thermoplastic resin and sintering it, and has an intermediate step of sintering the entire body having unevenly colored regions on the surface. The step of immersing the sintered resin body (1 m) in a surface treatment solution containing sulfuric acid and chromic anhydride and having a concentration of 300 g/L or more of chromic anhydride for 5 minutes or more, preferably the concentration of sulfuric acid in the surface treatment solution is set to 184 g/L to 368 g/L, and the concentration of chromic anhydride was set to 300 g/L to 500 g/L. |