Recycling of polyamide 12 based powders in the laser sintering process

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Performance Limitations in Polymer Laser Sintering (2014, methodology): “Other studies note a 2-3× increase in molecular weight with used powder, consistent with an increase in viscosity; see Dotchev and Yusoff (2009), and Zarringhalam et al. (2006).”
Powder characterisation techniques and effects of powder characteristics on part properties in powder-bed fusion processes (2017, background): “well-known ‘Orange Peel’ texture on the vertical faces of polymer parts indicating higher surface roughness (Dotchev and Yusoff 2009).”