(Totally Chlorine Free) when paper is declared as TCF, the paper concerned is bleached by using hydrogen peroxide instead of chlorine. This is the most environmentally acceptable method of bleaching.

Pulp produced without any chlorine or chlorinated chemical compounds whatsoever. Tack The property that renders a film of printing ink sticky to the touch. It is governed by viscosity and adhesion.

Reel of paper with progressively misaligned edge.

Process where ink is heated to boiling point, which then causes the ejection of the ink onto the media. Thermal printheads are usually cheaper that Piezo technology, but they need to be replaced more often.

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

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

The small link of paper that remains between each individual perforation cut, which links the paper together.

Soft, lightweight paper, often creped, generally between 17 and 30 g/m2 in weight which is used for hygienic, household and several other purposes.

Chemical liquid or powder used to create an image in photocopying and laser printing. Toner sticks to charged areas and is then transferred to the paper and fused by heat.

A rough paper surface.

Trapping is a word used in connection with printing a sequence of colours, one upon another. If one colour is still wet when another is applied on top, the two will tend to intermix, causing undesirable colour changes and a blurred image. However if the lower colour is thoroughly dry before the upper colour is applied, mixing will not normally occur; the lower colour is ‘trapped’ by the colour above. However, in special cases improved trapping can be achieved by using a different formulation for the upper ink so that there is even less tendency for the two inks to mix.

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 wire side, so that the finished sheet has two identical printing surfaces.

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.