Experimental Investigation of the Physical Aging of Laser Sinter Powders
The present paper focuses on the investigation of the change of the crystal morphology of polymeric laser sinter materials during annealing, and the discussion of the effect of annealing on the sinter process. The increase of the melting temperature due to annealing at elevated temperature, as is measured by calorimetry, was experimentally evaluated for two different materials. The re-use of in prior sintering processes non-sintered powder and the influence of blending with virgin material on the melting behavior of the dry blend are critically discussed. Proposals are made for the treatment of the used powder.
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