US 12,275,185 B2
Additive manufacturing by extruding inhibited crystallization polymers
Meisam Shir Mohammadi, Charlotte, NC (US); and Frank A. McKiel, Jr., Colorado Springs, CO (US)
Assigned to 3D Systems, Inc., Rock Hill, SC (US)
Filed by 3D Systems, Inc., Rock Hill, SC (US)
Filed on Jan. 3, 2024, as Appl. No. 18/403,144.
Claims priority of provisional application 63/478,790, filed on Jan. 6, 2023.
Prior Publication US 2024/0227282 A1, Jul. 11, 2024
Int. Cl. B29C 64/118 (2017.01); B29C 64/188 (2017.01); B29C 64/209 (2017.01); B29C 64/25 (2017.01); B29C 64/364 (2017.01); B29C 64/393 (2017.01); B29K 101/12 (2006.01); B33Y 10/00 (2015.01); B33Y 40/20 (2020.01); B33Y 80/00 (2015.01)
CPC B29C 64/118 (2017.08) [B29C 64/188 (2017.08); B29C 64/209 (2017.08); B29C 64/25 (2017.08); B29C 64/364 (2017.08); B29C 64/393 (2017.08); B33Y 10/00 (2014.12); B33Y 40/20 (2020.01); B33Y 80/00 (2014.12); B29K 2101/12 (2013.01); B29K 2995/004 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A process for forming a finished object in an additive manufacturing system by extruding a polymeric feedstock from a heated extrusion nozzle while moving the nozzle to deposit the feedstock in a specific pattern according to a digital data model describing a shape of the finished object, the process comprising:
selecting, as the polymeric feedstock, a thermoplastic exhibiting at least one inhibited crystallization characteristic; and
during at least a portion of the extrusion procedure to build the object, extruding the thermoplastic using a target extrusion temperature that exceeds both a first minimum temperature at which the thermoplastic becomes flowable through the nozzle and a second temperature, greater than the first temperature by at least 10° C., at which an inflection occurs in at least one post-printing mechanical property as a function of extrusion temperature for the thermoplastic;
wherein the at least one inhibited crystallization characteristic comprises the thermoplastic having polymer chains with aperiodic spacings between polar functional groups.