Larger
L/D Ratio
The
45/97mm conical twin screw, discharges like
a parallel 45mm, feeds like a parallel 97mm
& matches the gearing of a parallel 110.
A
conical 45mm extruder can match output of 65mm
parallel, the intake section has surface area
and gentle plasticizing of a 100 mm parallel,
while only the metering section has the excess
friction and shear of a 45 mm parallel.
The
small screw front face results in a low axial
force on the screws. |
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Gentle
and efficient plastification
The
screw surface area in the feed zone is considerably
larger than that of the parallel screws offering
same output.
As
a result, transmission of heat energy and the
plastification in the feed zone is much more
efficient.
Moreover
due to larger feed zone, plastification work
is spread out over a larger section of the screw. |
Optimized
screw geometry
Degressive
pitch in the feed & compression zone ensures
the continuity of compression, hence there are
no pressure peaks, which is in favour of a prolonged
life of the gear box.
In
the metering section, the meshing surface area
is less, which gives lower shear energy input,
and in addition, the shear rate is further reduced
because of the conical screw design. |
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Continuity
of compression
By
using conical twin screws, compression continuity
can be maintained throughout the length of the
screw.
Compression
continuity results into enormous processing
latitude & better quality of melt. |
Life
of gears
The
pinion gears of conical twin screw lasts much
longer than those of parallel twin screws.
As
the center distance is much larger, the gear
pinions have larger diameter which increases
the life of the gears.
The
life of gear pinions increases with the cube
of the diameter, which enhances the reliability. |
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Homogeneous
and better melt quality
The
meshing surface area of conical twin screw is
larger in the plasticizing section which results
into higher but controllable energy input through
shear.
In
the metering section, the meshing surface area
of conical twin screw is less, giving lower
energy input and hence homogeneous melting. |
Ease
of maintenance
The
conical twin screw is taken out from the backward
direction.
The
barrel is simply moved to the side which results
in higher productivity by saving machine down
time. |
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