ABSOLUTE MOISTURE
Absolute moisture defines what proportion of a paper’s mass is water. Given as a percentage.
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ABSORBENCY
The ability to take in or soak up liquid. In the graphics industry, absorbency refers to the paper’s ability to soak up liquid. Absorbency is measured according to standardised test procedures. Uncoated grades usually have a higher absorbency than uncoated.
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ABSORPTION
Taking in or soaking up. In the first drying phase or setting of an offset ink, the ink’s oil is absorbed by the paper. If the pigment is also absorbed, a lower density is produced.
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ACID-FREE PAPER
Paper that contains no acid which can have a detrimental effect on its ageing resistance.
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AGEING
A deterioration in properties relating to time and storage conditions.
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ALKALINE SIZE
see neutral size
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ANILINE PRINTING
see flexography
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AOX
A measure of chloro-organic emissions in watercourses. Some are harmless compounds, others can have a harmful effect on the ecosystem.
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APPARENT DENSITY
A measure of a paper’s compactness or specific weight. Calculated by dividing grammage by thickness. See bulk.
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ARCHIVAL PAPER
A paper made from rags or cotton, with particularly high capabilities and protection against wear during handling. Should also be able to handle the requirement for paper for permanent documents. Cf. paper for permanent documents.
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ASH CONTENT
A value which indicates the quantity of filler in an uncoated paper. Given as a percentage. The ratio of the mass of the residue after combustion to the mass before combustion.
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