QuickLabel Systems QLS-4100 Operation & Setup Manual page 172

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In single label mode, when the media is retracting you may notice the
liner drift from right to left across the peel edge. This is normal. A 2mm
to 5mm drift is expected. The media should correct itself while the next
label is being printed. It is more important to observe the media tracking
at the print station four (rear-most print station) media guide. The
position of the media at this guide will determine if an adjustment is
needed or not. If drift is greater than 5mm across the peel edge, image
placement will be compromised.
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The media liner may get bent or folded during rewinding and retraction.
This is acceptable as long as the liner does not tear completely. For this
reason perforated material is not compatible.
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In single label mode, media tracking is the best when the system is set up
for one particular width.
8-18 Print & Peel