- TACK That property, governed by viscosity and adhesion, which contact with the forming wire during manufacture. renders a film of printing ink sticky to the touch.
- TENSILE STRENGTH The maximum tensile force that a test
- THERMO MECHANICAL PULP Mechanical pulp in which the plate. Wood chips are heat treated before refining (commonly referred to
- THICKNESS The distance between one surface of a paper and the
- TICKET BOARD Another name for pasteboard, although coated paper’; the paper has no watermark and an even opacity; it is a type board can be included in this gtade, which is used for tickets, of paper in common use today.
- showcards or similar purposes. May be white or tinted.
- TISSUE PAPERSoft, lightweight paper, often creped, generally between 17 and 30g/m2 in weight which is used for hygienic, household and several other purposes.
- TUB-SIZINGThe operation of surface sizing paper by passing it through a bath of a suitable solution such as gelatine.
- TWIN-~VIRE Paper or board made on a paper making machine with a duplicated wire part. In this way two sheets are formed and combined wireside to wireside so that the finished sheet has two identical printing surfaces.
- TWO-SIDEDNESS An unintended difference of varying degree in surface texture or shade between the two faces of a paper or board, which is inherent in the method of manufacture.
- UNION PAPERPaper produced by combining together two webs or sheets of paper with bitumen, tar, or similar moisture/moisture vapour resistant materials.
- URBAN FORESTA description of towns and cities which are the source of wastepaper as one of the raw materials used for paper making.
- VAT MACHINE A paper or board making machine comprising one open ended cylinder, or more than one open ended cylinder in series, covered with fine mesh wire, which revolves in a vat of stock. Water draining through the wire leaves a mat of fibres on its surface and the ultimate thickness of the product may be determined by the number of cylinders used. The resultant web is removed from the last cylinder and then passed through conventional pressing and drying sections.
- VEGETABLE PARCHMENT Waterleaf paper that has been modified by the action of sulphuric acid. This treatment gives it a continuous texture, increased surface hardness and a high degree of resistance to penetration by organic liquids, generally and particularly fats, oils and greases. The structure also confers on the paper resistance to disintegration by water, even at boiling point.
- VELLUM PAPERVellum paper – strong, tough and of high class
- WET-ON-WET The superimposing of successive colours while WET STRENGTHENED PAPER
Paper so treated.
- WET STRENGTH RETENTION The ratio, expressed as a from furnishes comprising substantially or wholly synthetic fibres, percentage, of the value of a given strength property of a paper in Sheet material, resembling paper, made from synthetic filaments by the wet state to that of the same paper in the dry State, measured other means, e.g. spin bonding. Plastics material in sheet form, according to the standard method of test.
- surface treated to render it suitable for comnserciai graphic printing.
- WiRE SIDE The face of a web or sheet of paper which was in WOOD FREE Paper made wholly from chemical pulp and free TCF (Totally Chlorine Free) Pulp bleached without any chlorine from wood-based impurities, such as lignin, which are present in chemicals whatsoever. mechanical pulp.
- WORK AND TUMBLE Printing one side of the sheet, then piece of the paper will stand before it breaks under the conditions turning the sheet over, retaining the same sidelay edges but defined in the standard method of test, reversing the front and back edges, and using the same printing
- WORK AND TUMBLE Printing one side of the sheet, then piece of the paper will stand before it breaks under the conditions turning the sheet over, retaining the same sidelay edges but defined in the standard method of test, reversing the front and back edges, and using the same printing
- WORK AND TURN t~rinting on one side of the sheet, then as TMP). In some modern plants a degree of chemical treatment is turning the sheet over, retaining the same front and sidelay edges of employed as well (chemi-thermo mechanical pulp or CTMP). the sheet and the same printing plate.
- WOVE PAPER Paper first made as early as 1754 by forming it on other. Also known as caliper. It is measured in micrometres. a mould with a cover made from woven wire cloth, hence ‘wove