![]() It is also known as air knife marks or blade streaks. Blade Marks Paper coating defects caused at the time of coating operation with a bladeĬoater, producing areas which are more transparent than the rest of the Blade Cut A blade scratch that cuts deeply into or through the web. It producesĭarkening effect on the sheet. Moisture, and crushing caused by too much during calendering. ![]() Lowering of opacity of paper as a result of uneven formation, too much Blackening A paper showing burn marks on the surface. AĬoated paper defect that results in a grainy or textured appearance on theĬoated surface. Binder Specks A variation in ink receptivity caused by non-uniform binder distribution. Bark Specks These specks originates from outer bark of wood. Baggy Paper A paper which is thicker in middle than edges. The machine direction where low spots occur in the coating back-up roll. Backing Roll Mark A paper coating defect caused by the building up of coating in areas along Alum Spot Paper sheet having small undissolved alum crystals. They are called blade streaks when occurring in narrow areas Air Knife Mark A paper coating defect caused during the coating operation with anĪir-knife coater, producing areas that are more transparent than the rest of ![]() Viscosity of coating solution or poor adjustment of doctor. Air Doctor Mottle A paper coating defect caused by excessively high solid content or high The term also refers to bubbles of airįormed in the coating operation and the defective imprint that is caused by Air Bubbles Light spots in a sheet caused by bubbles of air that form in the stock on aįourdrinier wire (forming fabric) and are entrained in the stock as itĬascades in trays and channels. Also known as bubble marks or steamīlisters. Air Bells Tiny circular thin spot in the paper. ![]()
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