Tape marks are more apt to happen when sheeting heavier caliper stock and highly coated materials. The markings originate in the high speed tape section at first pinch point of the top and bottom tapes.
This problem can be corrected by allowing for more space between the 2 sets of tapes. Reduce the tension on both the bottom high speed tapes and the top high speed tapes. This should eliminate the full length marking.
It may be necessary to adjust the pinch roll at the delivery mouth of the top high speed tapes to create more room for the sheets.
