1998 / Solid Freeform Fabrication Proceedings
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Author Bernd Keller, Rolf Pfeifer, Wei-Nien Su, Peter Eyerer, Inst. of Polymer Testing and Polymer Science
Source Solid Freeform Fabrication Proceedings, 1998, pp 549-556
Abstract The knowledge of laser absorption is essential to describe the behavior of polymers in different laser processes, i.e.. SLS, LOM, etc. By means of transmission IR-spectroscopy a method for measuring temperature dependent penetration depths (absorption length) of polymers, especially at a wavelength of 10.6 microns (CO2-Laser), is developed. Results for the laser sintering materials polystyrene (PS), nylon 11 (PA 11), nylon copolymer (COPA) and polyethylene terephtalate (PET) are presented. It is detected that the absorption length of polymers will increase or decrease significantly dependent on temperature. This paper will point out simplified methods based on the one dimensional heat transfer equation with volume heat source to set the processing parameters i.e. for the SLS process. The calculations correspond with the measured data. (Auth abstract) [References: 5]
Solid Freeform Fabrication Proceedings can be obtained from: The Solid Freeform Fabrication Symposium
or contact:
The University of Texas at Austin
Laboratory for Freeform Fabrication / Texas Materials Institute
Mechanical Engineering Dept.
c/o The Solid Freeform Fabrication Symposium
MC C2200
Austin, TX 78712-1063 USA
512-471-3026; 512-471-7681 FX; Email: sffsymp@uts.cc.utexas.edu