Glossary / I

Immission
The level of a particular pollutant in the environment. Widely used for air emissions and noise.

Impregnation
The absorption of an impregnating agent into paper; in pulping, wood chips are impregnated with cooking liquor; timber is impregnated with preservative.

Impressed watermark
Semi–genuine watermark made in the paper machine press section using engraved rolls while the web is still wet.

Index board
Woodfree and mechanical board for office and administration purposes.

Inkjet printing
Technique that enables the production of large format colour print, using web of almost unlimited length and a maximum width of 150–200 cm.

Integrated Mill
Mill where timber is pulped and then made into paper.

ISO brightness
The brightness of paper and board measured at a wavelength of 457 nanometres under standard conditions.