US 11,718,011 B2
Method and system for regulating an extrusion process
Benoit Boulet, Boucherville (CA); Raffi Toukhtarian, Bekaa (LB); and Mostafa Darabi, Verdun (CA)
Assigned to THE ROYAL INSTITUTION FOR THE ADVANCEMENT OF LEARNING/MCGILL UNIVERSITY, Montreal (CA)
Filed by THE ROYAL INSTITUTION FOR THE ADVANCEMENT OF LEARNING / MCGILL UNIVERSITY, Montreal (CA)
Filed on May 8, 2020, as Appl. No. 16/870,161.
Claims priority of provisional application 62/846,100, filed on May 10, 2019.
Prior Publication US 2020/0353663 A1, Nov. 12, 2020
Int. Cl. B29C 48/30 (2019.01); B29C 48/92 (2019.01); G05D 5/02 (2006.01)
CPC B29C 48/30 (2019.02) [B29C 48/92 (2019.02); B29C 2948/926 (2019.02); B29C 2948/92571 (2019.02); B29C 2948/92647 (2019.02); B29C 2948/92904 (2019.02); G05D 5/02 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for regulating an extrusion process, the method comprising:
continuously and in real-time, during a current extrusion cycle,
obtaining a first thickness at a first position along an extrudate as material is extruded through a die gap of a die;
comparing the first thickness with an expected thickness of the extrudate at the first position to obtain a value for an error, the expected thickness modeled in real-time using a size of the die gap as input and by applying a linear system with non-minimum phase dynamics and a unity DC gain; and
varying the size of the die gap used in the current extrusion cycle when the error exceeds a threshold to compensate for the error.