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Wet Strength |
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Mechanical strength of paper when re-wetted with water. |
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Wet Strength Papers |
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Ordinary papers lose most of their dry strength properties when saturated with water. Wet strength papers resist disintegration and rupture when saturated with water. Wet strength papers should retain 15% or more of their dry-tensile strength. |
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Wet Tensile Strength |
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Ability of a wet paper sheet to resist tension applied in its plane. |
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White Lined Chipboard (WLC) |
| | A type of board made from recovered fibers. It is often mineral coated and used for consumer cartons for dry food and non-food products. |
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White Liquor |
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The cooking liquor used in production of sulphate pulp. It contains sodium hydroxide and sodium sulphide. |
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White Office Paper |
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A mix of paper collected for recycling. It includes computer printout, white copy paper and writing paper, and white envelopes without plastic windows. |
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White Paper |
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A type of paper whose natural color has been corrected by the addition of blue, yellow, and red dyes. Sometimes the term refers to printing and writing papers. |
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White Water |
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The milky water extracted from the furnish at the wet-end of the paper machine. It is reused in the paper making process because of its richness in fines and chemicals. |
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White Water System |
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A flow system for white water, which includes pipes, storage tanks, cleaning equipment, water from forming section and return feed. |
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Whiteness |
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An aesthetic quality, defining the look of the paper. |
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Wicking |
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The tendency of printing ink, to feather or move on the surface of a paper sheet or through to the other side of the paper. |
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Winder |
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A machine for cutting the paper web in the machine direction into narrower rolls. Winders are also known as slitter-winder. |
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Wire |
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A flat belt of metal or plastic mesh used to dewater the paper furnish on the wet-end of paper machine. Also known as forming fabric. |
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Wire Holes |
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Clean-edged holes without any contamination or foreign material. Caused by forming fabric or wire. |
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Wire Mark |
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The impression left on the paper by the forming fabric on the paper machine. |
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Wire Side |
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The side of paper, which is formed in contact with the wire on the Fourdrinier paper machine. Wire side is not as smooth as the felt or top side of the paper. |
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With the Grain |
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A direction parallel to the grain of paper. |
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Wood Bank |
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An arrangement in which companies exchange wood raw material to minimize transport cost. |
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Wood Chip |
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The coin-sized piece of wood, which is cooked in the digester. |
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Wood Extractives |
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Metabolic substance in wood that can be removed by solution in hot or cold water, ethers or other solvents that do not react chemically with wood. |
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Wood Preservative |
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Products that protect wood from pests. |
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Wood Procurement |
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Purchase, harvesting, and transport of wood to the mill for further processing to convert it into paper. |
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Wood Pulp |
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Mechanical or chemical pulp made from hardwood or softwood. |
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Wood Room |
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The debarking and chipping section of a pulp mill. |
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Wood Yard |
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The area in a mill where logs are stored, debarked, and chipped. |
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Woodcontaining |
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A paper containing a certain proportion of mechanical pulp. |
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Woodfree |
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Paper made from chemical pulp and free from wood-based impurities, such as lignin, which are present in mechanical pulp. |
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Woodfree Paper |
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Paper made from chemical wood pulps. Also referred to as "free sheet”. |
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Wove |
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The paper finish obtained by the impressions of a felt dandy roll. |
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Wove Dandy |
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A dandy roll covered with a wire cloth to achieve a wove finish. |
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Wove Paper |
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A type of paper with a smooth and even surface made on a mould with a fine wire mesh. |
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Wrapper |
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Paper or paperboard, which are used to protect a roll form damage. |
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Writing Paper |
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A type of uncoated paper that is suitable for writing with inks on both sides. Writing papers are always sized and can be woodfree or woodcontaining. |