December 12, 2016

Washout Ink 

A type of water-washable ink used for printing on textiles and fabrics that is easily washed out.
December 12, 2016

Water Immersion Test

A test to determine a paperboard’s water resistance or degree of sizing in which a paperboard sample is weighed, then immersed in water for a set period of time, at which point
December 12, 2016


Term for a continuous roll of paper that forms on a papermaking machine, or the paper roll that is used uncut in web offset lithography. Paper webs can either be cut into sheets
December 12, 2016

Web Break 

The breaking of a paper web when it is on-press, which can occur at any point from start to finish, and which is caused by many factors. A web break
December 12, 2016

Web Break Detector 

In web printing, an auxiliary device which automatically detects the site of a web break and immediately shuts down the press.
December 12, 2016

Web Tension

In web offset lithography, the pull applied to a web of paper as it travels through the press. See Web Offset Lithography: Infeed and Web Control.
December 12, 2016


A property of printing inks that describes the ability of the dry ink film to resist bleeding, discoloring, fading, etc., upon exposure to moisture. An ink’s wettability is an important consideration
December 12, 2016


A procedure performed in the ink-manufacturing process in which the particles of pigment are coated with varnish so as to enable them to be ground more easily and finely and disperse more completely in
December 12, 2016

Wetting Agent 

A substance added—typically in small quantities—to a liquid in order to reduce its surface tension and allow solids to be more completely wet by the liquid. A variety of wetting
December 12, 2016


An optical property of paper that describes the degree to which a paper diffusely reflects light of all wavelengths (i.e., colors) of the visible spectrum. The ideal white standard (a

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