Paper making machine technology--How paper is Made?

Author:Qinyang City Pingan Light Industrial Machinery Co., Ltd. Popularity:5246 Issuing time:2016-12-09
Paper making machine technology--How paper is Made?
Paper is simple material. It is
essentially a mat held together by the fiber’s roughness, and can be made from
almost any fibrous material like wood or recycled paper.
The process for making paper
was invented in China in the second century A.D., and all paper was made one
sheet at a time until 1798.
The process of making paper
has not changed – at least, fundamentally – since its discovery. But with
almost two centuries of improvements and refinements, modern
paper making is a fascinating, high tech industry. Wisconsin has led
the nation in paper making for more than 50 years.
Typically, trees used for
paper making are specifically grown and harvested like a crop for that purpose.
To meet tomorrow's demand, forest products companies and private landowners in
Wisconsin plant millions of new seedlings every year.
To begin the process, logs are
passed through a debarker, where the bark is removed, and through chippers,
where spinning blades cut the wood into 1" pieces. Those wood chips are
then pressure-cooked with a mixture of water and chemicals in a digester.
Used paper is another
important source of paper fiber. Thanks to curbside recycling programs in many
communities, we recover 40% of all paper used in America for recycling and
reuse. The paper is shredded and mixed with water.
The pulp is washed, refined,
cleaned and sometimes bleached, then turned to slush in the beater. Color dyes,
coatings and other additives are mixed in, and the pulp slush is pumped onto a
moving wire screen.
Computerized sensors and
state-of-the-art control equipment monitor each stage of the process.
As the pulp travels down the
screen, water is drained away and recycled. The resulting crude paper sheet, or
web, is squeezed between large rollers to remove most of the remaining water
and ensure smoothness and uniform thickness. The semidry web is then run
through heated dryer rollers to remove the remaining water.
Waste water is carefully
cleaned and purified before its release or reuse. Fiber particles and chemicals
are filtered out and burned to provide additional power for the mill.
Paper makers carefully test for
such things as uniformity of color and surface, water resistance, and ink
holding ability.
The finished paper is then
wound into large rolls, which can be 30 feet wide and weigh close to 25 tons. A
slitter cuts the paper into smaller, more manageable rolls, and the paper is
ready for use.
Paper making is one of the most
capital intensive industries in the nation, investing over $100,000 in
equipment for each employee. The largest paper making machines are over 32 feet
wide, 550 feet long and can produce over 1,000 miles of paper a day.
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