![]() This crushes the fibers and disorients theįormation resulting in to darkened color and reduced opacity and surfaceĬalender Cut A mark or cut occurring in the paper sheet as a result of wrinkles in theĬalender Mark Paper defects caused by faulty calender roll surfaces or extraneous matter The reel during winding and results in a machine direction shearing force thatĬalender Blackened or Calender Crushed A paper whose color has been darkened because of calendering it while it is It is caused by too high web tension between a hard and soft section of Burst The defect in paper characterized by rapture in the web not extended toĮdges. To compensate for this extra length, it buckles as it is wound. That edge is thinner and longer than the balance of the width of the paper on Buckles The edge of a roll, usually only part of the diameter, where the paper along Spread on the coating in the papermaking process. Brush Marks (Coated Paper) Used for streaks in the surface of coated papers made by brushes which In the coating dryer section of the heat-set press.īristle Marks (Coated Paper) Use for indentations in the surface of coated papers in the shape of brushīristles. Blistering (Coated Paper) Caused when water vapours can not escape fast enough through coating layers Blemish Undesirable marks on the surface of paper sheet. ![]() Bleach Scale Used for pearly, light brown, brittle spots in paper. It is irregular line essentially in machineĭirection. Blade Wrinkle A blade coating defect where the sheet has been folded over on itself when Machine direction, caused by a particle of varied origin becoming lodgedīehind the blade during coating. Blade Scratch A very fine, hair like indentation in a coated surface that runs in the 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.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |