---
_id: '22187'
abstract:
- lang: eng
text: Due to long process times at high temperatures, unmolten polyamide 12 material
ages during the manufacturing process. Hence, it needs to be refreshed with new
material for further build cycles. In application, refresh rates of about 50 %
are commonly used. In this work, the recycling optimized material PA 2221 from
EOS is analyzed along a series of 13 build and refresh cycles using a reduced
refresh rate of 32 %. Before and after every build, the powder is analyzed regarding
melt properties determined by MVR and DSC measurements. Thereby, in-process ageing
effects are investigated and the steady-state conditions are determined accordingly.
In addition, powder properties are directly linked to resulting mechanical and
geometrical part properties. Key findings are a robust DSC measurement method
for polyamide 12 powder, constant “circulated” material properties after three
build/refresh cycles and robust tensile properties along the whole tested powder
life cycle. As a result, process conditions of PA 2221 using reduced refresh rates
can be derived from this work.
author:
- first_name: Stefan
full_name: Josupeit, Stefan
last_name: Josupeit
- first_name: Johannes
full_name: Lohn, Johannes
last_name: Lohn
- first_name: E.
full_name: Hermann, E.
last_name: Hermann
- first_name: Monika
full_name: Gessler, Monika
last_name: Gessler
- first_name: S.
full_name: Tenbrink, S.
last_name: Tenbrink
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
citation:
ama: 'Josupeit S, Lohn J, Hermann E, Gessler M, Tenbrink S, Schmid H-J. Material
Properties of Laser Sintered Polyamide 12 as Function of Build Cycles Using Low
Refresh Rates. In: 26th Annual International Solid Freeform Fabrication Symposium.
Vol 26. ; 2015:540-549. doi:http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf'
apa: Josupeit, S., Lohn, J., Hermann, E., Gessler, M., Tenbrink, S., & Schmid,
H.-J. (2015). Material Properties of Laser Sintered Polyamide 12 as Function of
Build Cycles Using Low Refresh Rates. In 26th Annual International Solid Freeform
Fabrication Symposium (Vol. 26, pp. 540–549). http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf
bibtex: '@inproceedings{Josupeit_Lohn_Hermann_Gessler_Tenbrink_Schmid_2015, title={Material
Properties of Laser Sintered Polyamide 12 as Function of Build Cycles Using Low
Refresh Rates}, volume={26}, DOI={http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf},
booktitle={26th Annual International Solid Freeform Fabrication Symposium}, author={Josupeit,
Stefan and Lohn, Johannes and Hermann, E. and Gessler, Monika and Tenbrink, S.
and Schmid, Hans-Joachim}, year={2015}, pages={540–549} }'
chicago: Josupeit, Stefan, Johannes Lohn, E. Hermann, Monika Gessler, S. Tenbrink,
and Hans-Joachim Schmid. “Material Properties of Laser Sintered Polyamide 12 as
Function of Build Cycles Using Low Refresh Rates.” In 26th Annual International
Solid Freeform Fabrication Symposium, 26:540–49, 2015. http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf.
ieee: S. Josupeit, J. Lohn, E. Hermann, M. Gessler, S. Tenbrink, and H.-J. Schmid,
“Material Properties of Laser Sintered Polyamide 12 as Function of Build Cycles
Using Low Refresh Rates,” in 26th Annual International Solid Freeform Fabrication
Symposium, 2015, vol. 26, pp. 540–549.
mla: Josupeit, Stefan, et al. “Material Properties of Laser Sintered Polyamide 12
as Function of Build Cycles Using Low Refresh Rates.” 26th Annual International
Solid Freeform Fabrication Symposium, vol. 26, 2015, pp. 540–49, doi:http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf.
short: 'S. Josupeit, J. Lohn, E. Hermann, M. Gessler, S. Tenbrink, H.-J. Schmid,
in: 26th Annual International Solid Freeform Fabrication Symposium, 2015, pp.
540–549.'
date_created: 2021-05-14T07:46:18Z
date_updated: 2022-01-06T06:55:28Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
doi: http://utw10945.utweb.utexas.edu/sites/default/files/2015/2015-43-Josupeit.pdf
intvolume: ' 26'
language:
- iso: eng
page: 540-549
publication: 26th Annual International Solid Freeform Fabrication Symposium
status: public
title: Material Properties of Laser Sintered Polyamide 12 as Function of Build Cycles
Using Low Refresh Rates
type: conference
user_id: '71545'
volume: 26
year: '2015'
...