couch roll
A roll or cylinder on a papermaking machine the
purpose of which is to press, i.e., de-water, or
COUCH (4) the
newly formed web of paper from the wire, and to
transfer the web to the wet press for further
de-watering. Couch rolls are of two basic types:
the suction couch roll and the pressure couch
roll. The suction couch roll is a heavy metal
shell drilled with numerous small holes through
which a high vacuum exists for the rapid removal
of water from the web as it travels over the roll.
The pressure couch roll consists of two rolls
which apply pressure to the web to remove water.
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