Avery Berkel IM Series User Instructions page 69

70
Speed/density
You can enter a print speed between 50mm/s and 80mm/s. A slower print speed may
improve print quality on low specification paper. Low print speed may also help if you
have peel off problems with some types of label.
You can set the print density between 0% and 100%. The default setting is 100% but you
may want to decrease the density when using a slow print speed.
Machine Set-up
5.3 Printer set-up
IM series User Instructions