Zebra Technologies R-140 - Manual (Page 51)

Removing the Label Backing Material
Since the rewind spindle holds the backing from a standard-size media roll,
we recommend that you perform this procedure whenever you change the
media.
To remove the backing material from the rewind spindle, follow these steps
(you don’t need to turn off the printer for this procedure).
1. Unwind approximately 36” (914 mm) of backing from the rewind
spindle. Cut it off at the spindle.
2. Pull out the hook. Slide the backing material off of the rewind spindle
and discard.
3. Wind the media around the rewind spindle once or twice and reinstall
the hook. Continue winding to remove any slack in the media.
42 Zebra R-140 User’s Guide