Shift Marks
Shift Marks / Chop Marks (Carpet)
Floor Detective® Claims and Conditions Guide
Summary
Shift marks, also referred to as chop marks, are manufacturing-related appearance conditions associated with step-over stitch tufting processes. The condition develops when yarn tension, backing tension, or needle timing is not consistently balanced during directional needle shift. This imbalance may produce alternating rows of slightly higher and lower pile height extending across the carpet width. The variation is inherent to tuft formation and is present at the
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