8/12/2019 Paper Manufacturing Eng
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The manufacturing process of paper is divided into a series of
operations which
are set out below:
Preparation of the pulp: Disintegration is a mechanical
operation by which pulp presented in
the form of sheets or pressed boxes and which needs to be
brokendown is placed in a water suspension.
Deflaker - Total disintegration. Refinining- is the operation in
the preparation of the pulp in which,
through the action of mechanical work and in the presence of
water,
the structure of the fibres and their physical-chemical
structure is
changed.
Mixture of different additives fiber alone is not enough to
obtainedthe characteristic and properties suitable for each
different
use(magazines, paper work, toilet paper, etc). Therefore a
non-fibrous product must be added to produce a suitable properties
and
which can be divided into two groups: 1.Additives are added in
the
manufacturing process in order to change the characteristics of
the
paper. 2. Auxiliaries, to facilitate work and help in the
manufacturing
process.
Cleaning is a process by which undesired particles are
removedduring the manufacturing process or from the finished
paper.
Formation of the sheet- involves transforming a volume of the
diluted pulpinto a fine, wide and uniform laminate, with all the
components perfectly
distributed.
Wet pressing continuation of the water elimination process which
startedon the forming table.
Drying carried out in an area known as the drying section, in
which theheat causes the water in the paper to evaporate leaving it
dry.
Coating- defined as the operation that consist in covering the
surface of apaper or cardboard with a material in liquid form
providing the sheet with a
series of properties suitable for printing.
Paper finishing Calendering to improve the gloss and printing
properties of the
paper.
Winding process to cut and rewind the reel produced by the
papermachine into reels with a smaller diameter and width.
Cutting converts a reel into series of formats or sheets with
theprecise measurements required by a customer.
