Patent ID: 11932770
Assignee: SANKEI GIKEN KOGYO CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A method for producing a resin sintered body, comprising repeating steps to produce an intermediate resin sintered body having an uncolored region on a surface thereof by forming layers of thermoplastic resin powder, applying to each desired site in the layers of thermoplastic resin powder a fusing agent including a coloring ink and a fusion modifier, followed by fusing and sintering the layers of thermoplastic resin powder by multi jet fusion additive manufacturing;
the method further comprising a step of immersing the intermediate resin sintered body, which has the unevenly colored region on the surface thereof and a whole of which has been already sintered, in a treatment liquid containing sulfuric acid and chromic anhydride, to remove uncolored resin powder.