Expert knowledge from A-Z


Indirect mechanical flat printing process with a transfer roller.

Oriented polyamide film

Optical density. A densitometer (instrument for measuring the degree of darkness of materials) is used to compare the intensity of light transmitted through an optical layer and the incident light.

Adjective form of opacity (from the Latin opacus meaning darkened, non-transparent)

Oriented polypropylene

Arrangement of molecules in the film fusion. The molecules are either arranged in relation to each other or not oriented (arranged randomly). Oriented material shrinks more than non-oriented material. See also "Stretching"

Signet Maropack, für nachhaltige Verpackungen