digester
A vessel in which pulpwood, straw, esparto, rags,
or other cellulosic materials are treated with
chemicals and heat to produce the pulp used in the
manufacture of paper. A digester is usually
constructed to withstand elevated pressures and is
made of materials designed to resist the chemicals
used in pulp preparation. Digesters may be
cylindrical, spherical, horizontal, vertical,
stationary, rotating or designed to tumble. Most
are stationary. A digester may be designed for
batch operation, in which it discharges its pu lp
at the conclusion of a fixed cycle, or it may be
designed for continuous operation, in which case
it moves the raw material and chemicals at a fixed
rate from the charging end to the discharging end.
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