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 North America's #1 Resource for Paper Grade and Company InformationSunday, October 21, 2018  
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Walden's Paper Catalog Glossary of Terms:
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abrasion resistance
Measure of a paper's durability when subject to abrasive action of erasers.
abrasiveness
Property of paper causing it to scratch surfaces it contacts.
absorbency
The ability of paper to absorb or take in liquids.
Accelerated Agin Test
A technique to estimate the permanence of paper by exposing it to heat or heat and moisture.
acid size
Rosin size containing a large proportion of emulsified, free or uncombined rosin. (See rosin size)
acidity
Degree of acid found in a given paper measured by the pH factor. pH is measured from 0 to 14, with 7 representing neutral between acid and alkaline. From 0 to 7 is considered acid as opposed to 7 to 14 which is alkaline.
actual weight
Accurate weight of a given quantity of paper, which is different from the same paper's nominal weight. (See nominal weight.)
adding machine paper
Paper in roll form for use on adding and tabulating machines. Weight: 16 to 18 lbs. 17 " x 22"/500 sheets.
aesthetic
Qualities having to do with the beauty of the printed image.
AF&PA
American Forest & Paper Association, established in 1993, merged the activities of the American Paper Institute (API), National Forest Products Assn. (NFPA) and American Forest Council (AFC) thereby representing every major sector of the national forest products industry. AF&PA represents member companies which grow, harvest and process wood and wood fiber, manufacture pulp, paper and paperboard products from both virgin and recovered fiber and produce solid wood products in the United States.
after-tack
In reference to printing, the tack of ink after apparently being dried.
against the grain
Folding or feeding paper at right angles to the grain or direction in which the fibers lie.
agate marble paper
Paper commonly used as end papers in books.
air blade coating
Coating subjected to a thin jet of air. Air jet removes excess coating and smooths surface of freshly coated paper. (Same as air knife coating)
air brush coating
Coating sprayed on web of paper by air pressure.
air dried paper
In the process of air-drying, paper is dried on the paper machine and reeled as a damp roll. Or the web of paper may be passed through a vat or surface-sizing procedure one step before entering the air dryer. In each case, the damp web passes slowly through an enclosed chamber or tunnel through which hot air circulates. The web is supported on slats or festooned over rollers. This way, the web of paper dries without tensions. It is not influenced by the smoothing effect of paper machine dryers and felts. Consequently, a harder, rougher surface results in a cockle finish. The characteristic, dignified appearance of high grade bonds and ledger papers is the products of air drying.
album paper
Usually refers to blank cover paper and used for making photographic albums.
albumen plate
Offset printing plate coated with light-sensitive albumen. Image is formed by the action of light through a photographic image.
alignment marks
In forms layout, preprinted mark on a form used to assist the user in positioning the form so that entries are accurately positioned.
alkali proof
Paper that resists discoloration through contact with alkaline substances, such as soap. Glassine and waxed papers are also used for such purposes.
alpha pulp
Highly refined wood pulp with exceptional paper making properties: high chemical purity, high brightness, great permanence and unusually high resiliency.
aluminum-coated board
Board coated with aluminum foil.
analytical method
Method of finding the nature and amounts of ingredients in paper.
aniline printing
Letterpress printing process in which the ink contains rapidly evaporating solvents. Printing plates for this process are ordinarily made from rubber. Process is used for printing bread wrappers, confectionery wraps, bottle wraps and gummed tapes.
animal size
Glue and gelatin extracted from animal hides and used as a papermaking size. (See size).
announcements
Folded cards or sheets of paper fitting matched envelopes and generally used for social stationery and announcements.
antique finish
Rough paper finish created by reducing pressure at the wet presses and with little calendering. Term describes a rougher than usual finish when used as a prefix as in Antique Vellum and Antique Eggshell.
antique glazed
Paper which has a high finish on one side and an antique finish on the other.
APA
American Pulpwood Association. Fosters education and provides leadership and assistance for the continuing development, use, and renewal of the United States' forests, and for meeting the nation's persistent and future needs for pulp, paper, paperboard and other forest products.
apparent density
Weight per unit volume of a sheet of paper obtained by dividing the basis weight by the caliper.
archival paper
Acid-free paper made to resist disintegration and used for documents that must last.
art paper
Usually refers to coated paper for printing halftones.
artificial parchment
Greaseproof paper with a parchment-like finish.
artist's illustration board
Bristol, pasted, solid or filled suitable for pencil drawings, pen-sketching or water color painting. Color, finish, rigidity and freedom from warping are principal characteristics.
artist's paper
Superior paper for drawing, made with a close weave.
ash
The mineral residue left after burning a sample of paper to determine the percentage of filler it contains.
atmosphere
Air including all its constituents: oxygen, nitrogen, carbon dioxide, rare gases, dust and moisture.
auxiliary roll stand
A second roll stand, for use on a web press, that can be mounted on top of another roll stand. Reduces downtime since it permits one stand to be reloaded while another continues to unwind.
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