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3F-SCREEN
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Application |
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For
removal of flat, narrow and long foreign matters (Heavies) and
light weight contaminants suchas corks, plastic pieces. This
is most suitable for primary Screening after the pulpers. The
table given below shows the relation between stock consistency
and Screen Perforation for selection |
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Consistency(%)
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Hole
Perforation ( in mm )
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Slot
Perforation ( in mm )
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3
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5
- 3
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1.5
- 1.0
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2.5
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3
- 2.5
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1.0
- 0.7
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2
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2.5
- 2.0
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0.7
- 0.4
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1.5
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2
- 1.5
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0.4
- 0.3
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1
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1.5
- 1.2
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0.3
- 0.15
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0.5
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1.2
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1.15
- 0.1
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Specification
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Middle
Body :- consist one no. stock int for tangential
feeding the stock is being accelerated by rotating impeller.
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Bearing
Body :- and rotor with perforated extraction plate
is fitted in the upper body.
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Bed
bar :- in additional to breaking the stock, the bed bar
acts upon the change of flow from rectified to trubulent,
to minimise the flake contents.
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Accept
stock outlet :- The stock entering under high pressure
is exposed to impact and shear forces caused by the impeller/
Bed bar for defibration and goes upward through perforated
extraction plate while foreign matters down into the tail
cyclone for removal.
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High
pressure back water pump :- It takes water from
Thickner tank & clarified water is fed to tail cyclone
making pulp consistency low and also in main unit to increase
turbulence.
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Setting
tank / Junk removal tank :- The heavies rejected
in tail cyclone settle in the junk tank for intermittent manual
removal.
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Floating
stock out let :- The stock flowing in the settling tank
together with the heavies goes upwards to get through the
floating stock outlet at the top of tank and enters the circulation
pipe limked to the control part of the main unit.
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