SLS powder level problem

From: Yang Shoufeng (Dr) (
Date: Tue Jul 11 2000 - 10:58:18 EEST


We tried fine PE powder in the SLS ( average particle size about 10
microns). However, the powder on the part bed clumped to flake-like clump
after roller rotated through. Simple test showed that the flowability of the
powder turned bad after several recycles. Does anyone know the mechanism of
anti-rotate roller for powder levelling? Which properity of powder will
influence the mechanism? Does this problem belong to the field of fluid

Thanks in advance.

Yours sincerely

Dr. YANG Shoufeng

Design Research Center
School of Mechanical & Production Engineering
Nanyang Technological University
Singapore, 639798

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