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SAFETY PAPER Paper coated or printed to produce a warning word e.g. ''void'' if the original is tampered with. Often used to manufacture checks so often called check paper.
SHEETER Converting machine which cuts a web of paper into individual sheets.
SIZE Process of binding fibres and loading together to increase resistance to ink and increase strength. Resin or other sizing material is included in the furnish of a paper.
SIZING Process of applying resin or other sizing material included in the finish of a paper to bind the fibres and loading together. This provides greater resistance to ink, and much greater strength in the sheet.
SMOOTHNESS Measure of degree of surface irregularity in a sheet of paper.
SPECIFIC VOLUME Measurement of paper compressibility and suitability for forms printing.
SPLICE Point where two strips of paper are joined. Can relate to joining a mill roll or parts of continuous form.
STUB ROLL Used roll of paper that has had too large a percentage of the roll used for the remainder to be considered sufficient for further jobs. [butt roll]
SUBSTANCE Weight of paper defined in g/m2 [grams per square metre]
SULPHITE Sulphite process used in preparing wood pulp. Preparation includes use of sulphate of soda, caustic soda and sulphite of soda.
SUPER-CALENDERED [SC] Process to give paper a smooth glazed surface by passing it between the calender rolls under heavy pressure.
SUPERCALENDER In papermaking, alternating rolls of highly polished steel and compressed sotton in a stack. Paper is subjectted to the heated steel rolls and pressed by the compressed cotton rolls. This process imparts a high gloss finish to the paper.
SYNTHETIC FIBRE Fibres which are used to replace cellulose fibres used for paper manufacture, to offer special grades and characteristics which normal paper grades cannot offer. e.g. wall charts, labels, envelopes, manuals etc.
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TAG Strong grade of paper board with good bending/folding qualities, high bursting and tensile strength, tearing resistance, and selected for printed pieces where constant use is expected.
TEAR STRENGTH Resistance of paper to rupture. Measured in grams of force required to continue a cut or tear which has already been started. Equipment used for this test is an Elmdorf tester.
TENSILE STRENGTH Lengthways strenght of paper which determins the runability and changes in speed of throughput during printing.
TISSUE Protective lightweight paper [less than 65 gsm] placed over artwork and also used to indicate corrections or standards/colour/type etc.
TRANSLUCENT Ability of material to permit the passage of light through it even though the material is in itself not transparent.
TWIN-WIRE Even sided paper which has been produced from two webs, and which have then been joined together while still wet, with their undersides at the centre.
TWO COATING CHEMICAL TRANSFER PAPER Widely used carbonless paper. CB and CF coatings are colourless chemicals which react under pressure for give blue or black image. Requires appropriate coating to be brought together to form image.