A B C D E F G H I J K L M
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W
WATERMARK
A deliberate design or pattern in paper made by a dandy roll as the stock passes through the wet end processes. A watermark can be seen by holding the paper up to the light.
A deliberate design or pattern in paper made by a dandy roll as the stock passes through the wet end processes. A watermark can be seen by holding the paper up to the light.
WET END
The first stages of a papermaking machine before the drying process. At the wet end, stock is fed in and much of the high percentage of water is eliminated by drainage, suction and press rollers, leaving a web of paper which then passes to the drying cylinders.
WET-ON-WET
The superimposing of successive colors while the printed color is still wet, in one pass through the printing machine.
WET STRENGTHENED PAPER
Paper so treated as to decrease its loss in strength upon wetting.
WET STRENGTH RETENTION
The ratio, expressed as a percentage, of the value of a given strength property of a paper in the wet state to that of the same paper in the dry state, measured according to the standard method of test.
WIRE SIDE
The face of a web or sheet of paper that was in contact with the forming wire during manufacture.
WOOD FREE
Paper made wholly from chemical pulp and free from wood-based impurities, such as lignin, which are present in mechanical pulp.
WORK AND TUMBLE
Printing one side of the sheet, then turning the sheet over, retaining the same sidelay edges but reversing the front and back edges, and using the same printing plate.
WORK AND TURN
Printing on one side of the sheet, then turning the sheet over, retaining the same front and sidelay edges of the sheet and the same printing plate.
WOVE PAPER
Paper first made as early as 1754 by forming it on a mold with a cover made from woven wire cloth, hence "wove paper," the paper has no watermark and an even opacity. This is a type of paper in common use today.