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Glossary of Printing Terminology

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Tabbed On Stationery
Sheet printed letterheads or cut set forms (whether single or multi-part), stuck on to a continuous sprocket web, for carrying the stationery through sprocket mechanism on an output printer device.

Tachometer
A device for measuring the rate of revolution of a shaft. Generally, in flexography, a device for measuring the speed of a web.

Tack
The property that renders a film of printing ink sticky to the touch. It is governed by viscosity and adhesion.

TCP/IP (Transmission Control Protocol/Internet Protocol)
A packet communications protocol for data transfer over the Internet- the glue that holds the Internet together.

Telescoped Roll
Reel of paper with progressively misaligned edge.

Thermal Paper
The base paper used for thermal papers is first pre-coated and then treated with a special emulsion containing heat sensitive modifiers, co-reactants, pigments and colour formers. The heat from a thermal head (eg in a fax machine) melts the modifier, which in turn dissolves the co-reactant that allows the colour formers and pigments to mix, producing a high contrast image on paper.

Thermographic Printing
Relief effect created by dusting a special powder onto a printed image while still wet and then passing the sheet through a heating device.

Thickness
The distance between one surface of a paper and the other. Also known as calliper.

Thixotropic
The property of an ink where its viscosity is reduced merely by agitation. Discontinuing the agitation allows the viscosity to increase again.

TIFF (or TIF) Tag Image File Format
An image file format with built- in compression and originally devised for faxes. Unlike JPEG, TIFF compression is not lossy.

Tissue Paper
Soft, lightweight paper, often creped, generally between 170 and 30g/m2.

Toner
Chemical used to create an image in photocopying and toner printing.

TRAP
The area where adjacent coloured areas on printed matter are made to overlap slightly, so preventing ugly white gaps from appearing in the event of print misregistration.

TrueType
An outline font standard, originally developed by Apple and licensed to Microsoft, in direct competition to Adobe’s Type 1.

TVI (Tone Value Increase)
Otherwise known as dot gain, the difference between a tone value on the print and the tone value in the data file or on the plate.

Type1
A PostScript- based outline font standard developed by Adobe to replace non-scalable bitmap fonts in the late 1980s. legacy Type 1 fonts comprise separate printer (outline) and on-screen (bitmap) font files, but the outline fonts are supported natively in Mac OS X and Windows 2000/XP/Vistra.

Twin Wire
A two ply paper or board made on a papermachine with duplicated wire parts. In this way two sheets of the same composition are formed and combined, wire side to wore side, 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.