This type of tape mark is likely caused by setting the pinch at the overlap carriage too tightly. To be certain, take samples of sheet packets from the high speed tape section, prior to overlapping and samples in the slow speed tape section prior to stacking. If the cause of the tape marks is the overlap carriage, the tape marks should correspond to roughly the percentage of overlap.
Adjust the nip of the overlap carriage (or stop wheels) by raising it until the marks disappear. It’s important not to raise the overlap carriage too much, because the sheets will begin to skew when operating at higher speeds affecting pile quality.
