information about paper and pulp industry. paper making process
TRANSCRIPT
INFORMATIONABOUTPAPERANDPULP
INDUSTRY
PAPER MAKING PROCESS
The wooden logs from trees are cut down.
Then the logs are debarked ( i.e. removing the bark of
the tree ) using log debarker.
The debarked logs are then sent through a series of chippers equipped with
whirling blades which break them down into smaller and
smaller pieces.
The tiny fragments are then pressure cooked with
chemicals in a large vat called a digester to separate
the fibers.
The wood pulp is cleaned, refined, bleached.
SOME EXAMPLES OF
CHEMICALS USEDIN
PAPER PULP
CAUSTIC SODA
Its often used in paper pulp for maintaining pH of the
paper.
SILICATE OF MAGNESIA
This chemical gives paper a greasy feel and enable it to
take high finish.
HYDROGEN PEROXIDE
Used in pulp bleaching.
TITANIUM DIOXIDE
This is the chemical used to increase the brightness of
paper.
The wood pulp is run through a series of beaters
until it is a fine slush.
When the preparation of paper is complete , the paper slush is pumped onto a fast moving wire screen where it will start to
become a continuous sheet of paper