公开(公告)号：JP2006341594A

公开(公告)日：2006-12-21

申请号：JP2006130040

申请日：2006-05-09

Applicant: 3 D SYSTEMS INC

Inventor： PARTANEN JOUNI P ,  ZHENG NING ,  BISHOP RAYMOND J

IPC: B29C67/00 ,  B22F3/105 ,  B22F3/16

Abstract: PROBLEM TO BE SOLVED: To minimize a build-up of a chemical by-product accumulated on a laser window 32 having the surface of which is exposed to a process chamber with a circular circumstance, mounted inside of a frame, in an apparatus for forming a three-dimensional body every layer from a powder material by a laser sintering. SOLUTION: An inert gas source for supplying an inert gas in a flowing direction to an exposed face of the window and an inert gas dispenser 16 mounted to the window covering less than the a half of the circumstance are provided and the dispenser 16 provides with an exhaust opening with at least one positive flow forward to the exposed face in a flow geometry effective for distributing an inert gas as a laminar flow at a speed effective to form a curtain of the inert gas over the exposed face and at a flow rate to distribute the inert gas as a laminar flow in an effective flow geometry having a characteristic Reynolds number less than 200 which is effective to minimize accumulation of a chemical byproduct made from the powder material on a window 32 during a laser sintering. COPYRIGHT: (C)2007,JPO&INPIT