Glossary of Paper Terms

Glossary of Paper Terms


Rag Paper
Today it is usually referred to as cotton fiber paper. It is made from cotton cuttings and linters.
Rag Pulp
Pulp made by disintegrating new or old cotton or linen rags and cleaning and bleaching fibers.
Random Watermark
(See watermark).
Five hundred sheets of printing paper.
Ream Marked
Pile of paper is ream marked by the insertion of small slips of paper or "ream markers" at intervals of every 500 sheets.
Ream Marker
Piece of rectangular shaped paper used to mark off the reams in a stack of paper.
Ream Weight
Weight of a given ream of paper.
Ream Wrapped
Paper which has been separated into reams and individually packaged or wrapped.
Scrap paper collected for remanufacturing into recycled paper. EPA’s definition for recovered is the most widely accepted and does not include scrap paper created in the initial papermaking process, but does include scrap created in a mill after the paper comes off the paper machine. Printing waste and envelope trip are also recovered fiber.
This means the product can be recycled. This applies to most paper even if it is coated, waxed or other wise treated.
Paper made at least in part from recovered fibers. There is no universally acceptable definition so requirements vary by specific circumstances. EPA requires post consumer content in recycled papers purchased by federal agencies. But the FTC does not require post-consumer content in papers labeled recycled. Most US governments and companies use the EPA standards, but there is no requirement. In Canada most companies use the terra-choice definition for recycle which does require minimum levels of post-consumer fiber.
Neenah Paper in all of the CLASSIC® Brands and the ENVIRONMENT® Brand specify the amount of recycled fiber and the amount of post consumer.
In printing inks, varnishes, solvents, oily or greasy compounds used to reduce the consistency for printing. In photography, chemicals used to reduce the density of negative or positive images or the size of halftone dots (dot etching).
The mechanical treatment of pulp fibers to develop their papermaking properties.
Reflection Copy
In photography, illustrative copy that is viewed and must be photographed by light reflected from its surface. Examples are photographs, drawings, etc…
In printing, register is the placement of two or more images on the same paper in such a manner as to make them in perfect alignment with each other. When a printing job is in exact register succeeding forms or colors can be printed in the correct position relative to the images already printed on the sheet.
Register Mark
Mark placed on a form to assist in proper positioning of after-printing operations. Two short lines at right angles are called an angle mark. Also, bulls-eye marks placed on camera-ready copy to assist in registration of subsequent operations.
Alignment of one element of a form in relation to another. Also, alignment of printed images upon the same sheet of paper.
Relative Humidity (RH)
The amount of water vapor present in the atmosphere expressed as a percentage of the maximum that could be present at the same temperature.
The ability to keep photo film and the images thereon in proper register. Repeatability is usually measured in micrometers.
A term referring to printing again from standing negatives.
Chemicals that slow setting time of printing inks.
When the background is completely printed, and the design area is left unprinted.
Equipment which slits and rewinds paper webs into smaller rolls.
Right Side of Paper
The felt side of a sheet, also the side on which the watermark, if any, may be read.
Right-Angle Fold
Term used for two or more folds that are at 90 degree angles to each other.
Right-Read Image
Image similar to the original or intended final copy.
Stiffness, resistance to bending.
Web of paper. Paper wound around a core or shaft to form a continuous roll or web of paper.
Roller Stripping
In lithography, a term denoting that the ink does not adhere to the metal ink rollers on a press.
Rosin Size
A size added to paper to make it water resistant.
Rotary Press
Printing press in which the plate is wrapped around a cylinder. There are two types, direct and indirect. Direct presses print with a plate cylinder and an impression cylinder. Indirect rotary presses (sheet-fed offset presses) combine a plate cylinder, a blanket cylinder and an impression cylinder.
Intaglio process. The image is below the surface of the plate. (Letterhead image is raised the offset image is flat)
1) Ink on printed sheets, after sufficient drying, which smears or comes off on the fingers when handled. (2) Ink that comes off the cover during shipment and transfers to other covers or to the shipping carton or mailer; also called Scuffing.
In printing, an ink that has reached maximum dryness and does not mar with normal abrasion.
A separable two-layer acetate film of red or amber emulsion on a clear base. It has dozens of uses in graphics, most often for color separations by hand in the composition or stripping departments.
Rule Weight
Thickness of lines; hairline rule; medium rule (1/2 point); heavy rule (1 point).
Paper’s performance on a press and its ability to withstand the stresses of a running press unaltered. Not the same as printability.

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