Glossary / G

Glassine paper
Paper made from finely ground chemical pulp that is largely greaseproof but does not have wet strength. Its high transparency is achieved by very intense calendering (smoothing between rolls). Used as chocolate wrapping, in photo albums, wrapping for fish preservatives, protective covers for leaflets, envelope windows etc.

Glazing
First calendering, in which paper is passed through a roll nip to give it a smoother surface.

Grammage
Basic weight of paper expressed in grams per square metre (g/m² or gsm).

Gravure paper
Mostly mechanical, highly calendered (smoothed) paper with a high ash content, which is produced as coated or uncoated grade (See "Coated paper"). It must ensure uniform ink trapping at high printing speeds. In order to accept the ink from the deep etched or engraved ink cells of the gravure cylinders, gravure paper must have a certain degree of softness and suppleness. Applications: magazines and reviews, mail–order and travel catalogues, brochures and inserts with high print runs.

Greaseproof paper
Greaseproofness is either achieved by grinding of the pulp and pore–free web formation or by special additives.

Grinder
A machine in which logs are defibrated against a revolving grindstone.

Groundwood mill
An installation for producing mechanical pulp by grinding.

Groundwood pulp
A fibrous slurry produced by mechanically abrading the fibres from barked logs through forced contact with the surface of a revolving grindstone. It is used extensively in the manufacture of newsprint and publication papers.

Gumming
Paper with a coating of an adhesive which becomes sticky when wet.