Wood pulp is a dry fiberous material prepared by chemically or mechanically separating the fibers which make up
wood. Pulp can be either fluffy or formed into thick sheets. The latter form is used if the pulp must be transported from the
pulp mill to a
paper mill. Pulp which is shipped and sold as pulp (not processed into paper in the same facility) is referred to as market pulp. When suspended in water the fibers disperse and become more pliable. This pulp suspension can be laid down on a screen to form a sheet of
paper, and this is the primary use for wood pulp. Wood pulp is the most common material used to make
paper. The timber resources used to make wood pulp are referred to as
pulpwood. Wood pulp comes from
softwood trees such as
spruce,
pine,
fir,
larch and
hemlock, and
hardwoods such as
eucalyptus,
aspen and
birch.
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