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Book: Colonial Discourse and Post-Colonial Theory | |||
Narrative: Colonial Discourse and Post-Colonial
Theory The paper was made from pulp obtained by
chemical means, known as kraft pulping. Chips of wood were
placed in a large, sealed container known as a digester. The
digester contained a strongly alkaline solution of sodium
hydroxide and sodium sulfide. Bleaching removes lignin and
involves mixing the pulp with a series of oxidizing chemicals
that react with the lignin. After each mixture, the pulp was
washed with an alkaline solution that removes the treated
lignin. Fillers were added to the pulp. (A typical filler
is a clay known as kaolin. Other chemicals often added to
pulp include starches or gums. Rosin and alum are often added
as sizers, making the paper less absorbent.) Pulp was added
to water to form slurry in order to make paper with an even
density. The slurry was pumped onto a moving mesh screen made
up of very fine wires of metal or plastic. Water drained through
the small openings in the mesh, and formed a sheet of wet
material from the slurry. The sheet was moved on a series
of belst made of felt containing wool, cotton, and synthetic
fibers. The dried sheets moved between rollers known as calendars
to make it smooth.
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