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The
production process is briefly illustrated
in the schematic
flow diagram. The main raw material
is pulp made from wood which is a renewable
resource , Caustic Soda , Suphur & Charcoal.
There is strict process control at every
stage and latest computerized control systems
have been installed at the critical points.
This ensures uniform and consistent quality.
A
co-product of the production process is
Anhydrous Sodium Sulphate which is of the
highest purity. For every ton of fibre produced
we are presently recovering 0.75 ton of
Sodium Suphate.
We
are also producing Sulphuric acid &
Carbon bi-sulphide for captive consumption.
The
plant is equipped with a modern laboratory
and latest testing equipments. The laboratory
scientifically anlayses samples of raw materials,
materials in process and finished product.
Special emphasis is given in testing to
key parameters like tenacity, elongation,
whiteness and oil pick up.
Soda
Station
: This section deals with preparation of caustic
soda solution from 50 % to 42 %,
30 %, 18 % & 12 %, clarification and supply
of caustic solution to various places of its
consumption.
Slurry
Mixer : This section deals with conversion
of cellulosic wood pulp to alkali cellulose.
This is done in batch process. Fix quantity
of pulp & 18% steep lye is fed to the
slurry mixer. Slurry from the slurry mixer
is pumped to homogenizer and then to slurry
press.
Slurry Press : In this section
excess lye is removed from pulp slurry and
squeezed alkali cellulose is sent to maturing
drums through pre-shredders & shredder.
Maturing Drum : Ageing of alkali
cellulose (Alk-Cell) is done in maturing
drum (M.D.), a long jacketed cylindrical
vessel. Temp. of alk-cell is controlled
by circulating water at controlled temp.
in the M.D. jacket. Alk-Cell is then pneumatically
transferred to silo through cooling device.
Simplex
(Xanthators) : In this section
of process matured alk-cell reacts with
Carbon di-sulphide to get sodium cellulose
xanthate. Dilute caustic soda is added to
this xanthate and then the slurry is dropped
to dissolver for dissolving the xanthate
& thus making of viscose.
1-2-3
STAGE (Ripening Room ) : viscose
from dissolvers is received in receiving
tanks through homogenizers. The process
of ripening of viscose i.e. attainment of
right salt index is achieved in 8 –
10 hrs. While the process of ripening is
taking place, the viscose is filtered in
three stages and deaerated. After 3rd stage
of filtration the viscose is received in
Spg. tanks for pumping to Spinning department.
Spinning : In this section,
cellulose is regenerated in the form of
filaments of different denier by extrusion
of viscose through fine hole of a cluster
type spinnerette into a coagulating acid
bath followed by stretching and cutting
to desired staple length. Sodium sulphate
is produced here as a by-product and is
sent for recovery.
CS2
recovery : Cut staple fibre from
the cutter along with water flows to CS2
recovery trough through a trunk and forms
a mat. Steam is injected in this trough
through perforated steam pipes. CS2 present
in fibre mat gets liberated and goes to
CS2 condensing section along with steam.
In the CS2 condensing system CS2 gets condensed
and flows to storage tank. Almost 44% of
CS2 is recovered back.
Aftertreatment
: This section deals with washing &
finishing of fibre. This section is divided
in different zones like De-sulphurization,
Desulph wash, Bleaching, Bleach wash, Final
wash and Soft Finish. After application
of soft finish in Soft finish zone, fibre
is squeezed hydraulically and opened by
wet mat openers.
Dryer
: Fibre coming from wet mat openers of the
aftertreatment section, contains ? 100 %
moisture and is dried to ? 13 % moisture
in Dryer Section. Fibre is dried by counter
current hot air supply. To achieve 13 %
moisture dryer has been divided in different
zone. The circulating air temp. in different
zone is maintained by controlling steam
flow in the steam coils. Dried fibre from
dry end is send to baling press.
Baling
Press : The dried fibre from dry
end of dryer is conveyed pneumatically to
separator drum of baling press. In the baling
press bales are being made as per set weight
& dispatched to Ware house after passing
through online moisture & weight measuring
system.

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