paper process and paper industry

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 PEROXIDEUsed 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