Glossary / H

Hard pulp
A commonly used term to describe chemical pulp with a high lignin content.

Hardwood chemical pulp
Chemical pulp made from hardwood.

Headbox
Chamber at the beginning of a paper machine that dispenses pulp stock evenly onto a moving wire.

Hood
A hood covering the paper machine drying section and designed for moist air removal.

Hot screening
Pulp cleaning at elevated temperature using pressure screens.

Hot–ground wood pulp
Mechanical pulp produced by grinding logs that have been pre-treated with steam.

Humus
Dead organic material derived from decomposition of plant and microbial wastes.