A paper defect characterized by thick and thin marks in the surface of the web matching the size and shape of the holes on the couch roll, caused by a too-rapid removal of the forming web from the wire by the couch rolls.
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A paper defect characterized by thick and thin marks in the surface of the web matching the size and shape of the holes on the couch roll, caused by a too-rapid removal of the forming web from the wire by the couch rolls.