S
Salle - the department of the paper mill, sometimes called the Finishing House, where paper is sorted and counted.
Secondary Fibre - fibre that has been used before, e.g. waste paper.
Security Paper - generally rag paper, always woodfree, watermarked and chemically impregnated. Very reactive and strong. Security papers also carry identification marks which help to prevent counterfeiting. Used for making bank notes, cheques etc.
Show Through - degree to which printing is visible through paper due to the low opacity of the paper.
Size - non-fibrous materials used in papermaking to control the absorbency of paper. Rosin, Alum, starch and gelatine are the most commonly used.
Sizing - addition of size and chemicals during manufacturing process or by coating to control absorbency.
Solid White Board - board made of one or more plies of bleached chemical pulp.
Stock, Stuff, Porridge - terms used to describe the papermaking material in all stages, but usually referring to the wet pulp before it is fed onto the paper machine.
Suction Boxes - devices situated under a part of the wire which withdraw water and air from the rapidly consolidating web, also used in felt cleaning etc.
Sugar Paper - a quality wrapping paper, blue or purple, principally from waste paper and formerly used for sugar bags.
Supercalender - machine for giving paper a very smooth surface by passing it through a series of alternate metal and composition rolls, revolving with high speed and pressure.
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