US 11,738,491 B2
Method of influencing a backpressure length and/or a screw return speed
Guenther Klammer, Aschbach Markt (AT); Erich Hochreiter, Schwertberg (AT); Klaus Fellner, Steyr (AT); and Thomas Koepplmayr, Linz (AT)
Assigned to ENGEL AUSTRIA GMBH, Schwertberg (AT)
Filed by ENGEL AUSTRIA GmbH, Schwertberg (AT)
Filed on Nov. 25, 2020, as Appl. No. 17/104,193.
Claims priority of application No. A 51038/2019 (AT), filed on Nov. 28, 2019.
Prior Publication US 2021/0162643 A1, Jun. 3, 2021
Int. Cl. B29C 45/77 (2006.01); B29C 45/18 (2006.01); B29C 45/47 (2006.01); B29C 45/50 (2006.01)
CPC B29C 45/77 (2013.01) [B29C 45/1808 (2013.01); B29C 45/47 (2013.01); B29C 45/50 (2013.01); B29C 2945/76006 (2013.01); B29C 2945/7619 (2013.01); B29C 2945/76083 (2013.01); B29C 2945/76354 (2013.01); B29C 2945/76367 (2013.01); B29C 2945/76454 (2013.01); B29C 2945/76461 (2013.01); B29C 2945/76474 (2013.01); B29C 2945/76498 (2013.01); B29C 2945/76568 (2013.01); B29C 2945/76598 (2013.01); B29C 2945/76665 (2013.01); B29C 2945/76832 (2013.01); B29C 2945/76846 (2013.01); B29C 2945/76936 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method of influencing a backpressure length and a screw return speed in an axially extending plasticizing cylinder of a plasticizing unit for an injection moulding machine, the plasticizing unit including a plasticizing screw arranged displaceably and rotatably in a cylinder bore of the plasticizing cylinder, the method comprising:
metering plastic granulate fed to the plasticizing unit depending on a desired backpressure length in the plasticizing unit, wherein the plasticizing unit is operated in underfed mode, and
controlling the screw return speed using a screw peripheral speed of the plasticizing screw and a metered amount of the plastic granulate as setting variables.