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The
$165 billion pulp, paper and allied product industry supplies the
United States with approximately 300 kg of paper per person per
year. More than 300 pulp mills and more than 550 paper mills support
its production. The total annual direct cost of corrosion is estimated
at $6.0 billion, with the majority of this cost in the paper and
paperboard-making industry, and calculated as a fraction of the
maintenance costs. No information was found to estimate the corrosion
costs related to the loss of capital.
Paper production consists of a series of processes
and can be roughly divided according to the five major manufacturing
steps: pulp production, pulp processing and chemical recovery, pulp
bleaching, stock preparation, and paper manufacturing. Each manufacturing
step has its own corrosion problems related to the size and quality
of the wood fibers, the amount of and temperature of the process
water, the concentration of the treatment chemicals, and the materials
used for machinery construction. Examples of corrosion affecting
production are (1) corrosion products polluting the paper and (2)
corrosion of rolls scarring the sheets of paper. Corrosion of components
may also result in fractures or leaks in the machines, causing production
loss and safety hazards.
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