Abrasive
Papers -
papers covered on one or both sides with abrasive powder,
eg emery, sand paper etc.
Absorbency
- ability of paper or board to take up or retain aqueous
solutions; printing inks and varnishes.
Absorbent Papers
- duplicator, blotting and filter papers are the best
known; drying royal, matrix paper and towelling are other
examples.
Accepted Stock
- that part of the stock which is not rejected by cleaning
and/or screening.
Acid Free
- term describing paper and board that can be used with
anything that may be tarnished or otherwise harmed by
acid.
Against the Grain
- Folding at right angles to the grain direction of the
paper being used, as opposed to with the grain. Also called
across the grain and cross-grain. This can cause cracking
on heavier papers unless the paper is scored or creased
Air Dry -
Describing (1) the moisture content of a substance when
in equilibrium with the surrounding atmosphere; (2) woodpulp
which contains approximately 10% of moisture, paper 8%
of moisture.
Alum
- the term used in papermaking for aluminium sulphate.
Antique
- a quality bulky paper, particularly opaque, with a rough
surface finish. It can be made in white or in colours,
be deckle-edged , and either laid or wove. A good printing
surface is a feature of this grade which is often used
for more expensive books.
Apparent Density
- quotient of the grammage of a paper and it's thickness
in micrometers.
Art Paper -
generic term given to woodfree coated papers, which has
traditionally referred to papers in the upper quality
bracket and which have a highly polished surface.
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