Paper recycling has become an increasingly important
industry. Every year the percentage of paper that is recycled increases
compared to the percentage that ends up in landfills. In fact, in
1993 and every year since, more paper has been recycled than ends
up in landfills. The larger quantities of wastepaper available have
helped to reduce the costs of recycling and provide a greater array
of recycled paper and paper products.
The process begins with collection, which is still
one of the most expensive aspects of paper recycling. Besides collecting,
the collection process involves sorting the paper into categories,
baling, and transporting the paper to a facility that will manufacture
the wastepaper into pulp. The first step for the paper at one of the
repulping facilities is to be put into large vats where it is soaked,
reducing the paper into fibers. Reducing the paper into fibers process
is known as repulping. When ink starts to separate from the fibers,
chemicals are added to prevent the ink from reattaching to the paper
fibers. The ink is then removed from the pulp in a deinking system,
which is a series of screens that remove ink and additives. Then the
pulp is cleaned several times with heat and chemicals, which removes
additional ink. The pulp then enters a floatation device, where a
chemical mixture containing calcium soap is introduced. Air bubbles
form in this pulp and chemical mixture which cause any remaining ink
to float to the surface where it can be skimmed away. After the deinking
process, the pulp is ready to be manufactured into paper and related
products the same as if it were pulp that had been freshly made from
wood chips.
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