Printing Glossary - Letter R

Rag paper: paper made from linters and cuttings from cotton. It is also known as cotton fiber paper. It concerns the properties or grades of the paper stock.

Rag pulp can be defined as kind of pulp that is made by the disintegration of linen rags or cotton (whether it is old or new). It can also be made by bleaching fibers after they have been cleaned. It is a standard concept in printing. Usage varies with process and material.

Random watermark commonly denotes See watermark. It is a standard concept in printing.

Ream is pile of 500 sheets printing papers. It concerns the properties or grades of the paper stock.

Ream maker means A rectangular-shaped piece of paper that is used in marking off the reams in a pile of papers. It concerns the properties or grades of the paper stock.

Ream marked commonly denotes The insertion of ream markers after every 500 sheets. A piece of paper can also be used. As long as it is placed after every 500 sheets. It concerns the properties or grades of the paper stock.

Within the trade, ream weight refers to The weight of a particular ream. It is a standard concept in printing.

Ream wrapped is packaging or wrapping of reams. It is a metric used for setup or quality evaluation.

Recycled paper can be defined as papers made from used papers or old paper pulp. The used papers are first de-inked and cooked in chemicals. Subsequently, it is returned to a pulp. It concerns the properties or grades of the paper stock. Selection affects stiffness, opacity, and printability.

Reducers describes compounds which reduce the printing consistency. Example of reducers in printing are solvents, varnishes, and oily compounds. Reducers in photography are those chemicals that are used to mitigate dot etching or the positive nature and negative nature of images. It affects drying, adhesion, and print appearance. Formulation choices influence drying time and rub resistance.

Refining refers to The treatment of pulp fibers mechanically in order to improve their papermaking properties. It concerns the properties or grades of the paper stock.

Reflection copy refers to Examples of They are drawings, photographs and so on. A reflection copy is an illustrative copy that is photographed by light after it is viewed and that is reflected from its surface. It is a standard concept in printing. Usage varies with process and material.

Register: To register in printing means the proper placement of images on a single paper in order to make them have a perfect alignment. This perfect alignment enables the colors to be printed in the exact position just as in the already printed images on the sheet. It relates to book assembly and durability. It influences section alignment and page longevity.

Register mark means mark made on a form to enhance easy after-printing operation. These marks are of different kinds. There is the bulls-eye mark on camera and at right angles are the two short lines that are known as angle mark. It is a standard concept in printing. Usage varies with process and material.

Registration — The alignment of already printed images a single paper. It is also the alignment of an element of an image or any form whatsoever with another. It concerns the properties or grades of the paper stock. Selection affects stiffness, opacity, and printability.

Relative humidity (RH) means The amount of water vapor that is present in the atmosphere that is put down as a percentage of the total amount that could be present in that same temperature. It is a standard concept in printing. Usage varies with process and material.

Technically, repeatability describes The keeping of photo film and its images in the proper registry. Its measurement is usually done in micrometers. It is a standard concept in printing.

Rerun is name given to the act of printing again from already standing negatives. It is a standard concept in printing. Usage varies with process and material.

Technically, retarders describes those chemicals that make the setting time of a printing ink slower than it ought to be. It affects drying, adhesion, and print appearance.

Reverse: term given to printed material with a completely printed background and an unprinted design area. It is a standard concept in printing. Usage varies with process and material.

Rewinders can be defined as equipment that cuts or slits the paper webs and rolls them into smaller rolls. It concerns the properties or grades of the paper stock.

Right-angle fold describes Two or more folds that are 90-degree angles to each other are known as a right-angle fold. It is a standard concept in printing.

Right-read image is image that is similar to the Intended copy of the original copy. It is a standard concept in printing.

Rigidity is hardness or stiffness. It can also be a refusal to bend. It is a standard concept in printing.

Within the trade, rob-off refers to There are two meaning to this word;. The ink that smears or stains the finger as no result of the ink on the printed sheet not been properly, though sufficiently dried. An ink that goes off the cover in the transfer of printed materials or in the shipping process. It is also known as scuffing. Rub-proof. It affects drying, adhesion, and print appearance. Formulation choices influence drying time and rub resistance.

Roll — A web of paper is called a roll. Paper continuously wrapped around a shaft or a core which forms a web of paper is a roll. It concerns the properties or grades of the paper stock. Selection affects stiffness, opacity, and printability.

Roller stripping refers to When used in lithography, it means that the ink in use does not adhere to the ink rollers made of metal on a press. It affects drying, adhesion, and print appearance.

Rosin size is The term given to a size that is added to a paper so that it becomes water-resistant. It concerns the properties or grades of the paper stock.

Rotary press means This kind of printing press has its plates wrapped around a cylinder. The two types of presses are; the direct press and the indirect rotary press. The direct presses print has a plate cylinder and a impression impression cylinder. While the indirect rotary press is a combination of a plate cylinder, an impression cylinder, and a blanket cylinder. It is equipment used for production or quality control. Calibration is essential for reliable results.

Rotogravure commonly denotes intaglio process. The image in this process is placed underneath the surface of the plate. It is a method of producing printed images.

Rub-proof describes term used when ink is completely dried and a mere touch or reasonable abrasion cannot mar or take it off. It affects drying, adhesion, and print appearance.

Rubylith commonly denotes double-layer acetate-film of amber emulsion or red when placed on a clear base. It is separable. The rubylith has numerous uses as long as graphics are concerned. However, it is mostly used for color separations in the stripping department. It is a metric used for setup or quality evaluation. Higher values do not always imply better quality; context matters.

Rule weight — term used to describe the thickness of lines, heavy rule, medium rule, and hairline rule. It is a metric used for setup or quality evaluation.

Runability commonly denotes different from printability. The performance of the paper on a press and the ability of the paper to withstand the stress associated with an unaltered Running press. It concerns the properties or grades of the paper stock.

Translucent papers can be defined as see-through papers. Information can be seen through these type of papers. It is however not as clear as acetate. It concerns the properties or grades of the paper stock.