RAG
- the two main rag fibres used in paper making are cotton
and linen, rag paper consists of 25-60% rag fibre and
the rest is chemical wood pulp.
Ream
- a term denoting a number of sheets of paper ranging
from 480 to 516, most commonly 500.
Reel
- Term used for continuous roll or web of printing paper.
Relative Humidity
- the mass of water vapour actually contained in a given
volume of air expressed as a percentage of the maximum
mass of water vapour that could be contained in that same
volume at the same temperature.
Retention
- the percentage of the amount of a loading or additive
added to the stock that is retained in the final sheet
of paper.
Rigidity
- the force required to bend a strip of paper or board
through a known angle.
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