Glossary of Terms

Content courtesy of Neenah Paper and Packaging.

A B C D E F G H I J K L M O P Q R S T U V W X Y Z
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).
Ream
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.
Recovered
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...
Recycleable
This means the product can be recycled. This applies to most paper even if it is coated, waxed or other wise treated.
Recycled
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...
Reducers
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).
Refining
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…
Register
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...
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.
Registration
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.
Repeatability
The ability to keep photo film and the images thereon in proper register. Repeatability is usually measured in micrometers.
Rerun
A term referring to printing again from standing negatives.
Retarders
Chemicals that slow setting time of printing inks.
Reverse
When the background is completely printed, and the design area is left unprinted.
Rewinder
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.
Rigidity
Stiffness, resistance to bending.
Roll
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...
Rotogravure
Intaglio process. The image is below the surface of the plate. (Letterhead image is raised the offset image is flat)
Rub-Off
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...
Rub-Proof
In printing, an ink that has reached maximum dryness and does not mar with normal abrasion.
Rule Weight
Thickness of lines; hairline rule; medium rule (½ point); heavy rule (1 point).
Runnability
Paper’s performance on a press and its ability to withstand the stresses of a running press unaltered. Not the same as printability.