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1.4 Forming, Redistribution and Addition Processes
Polymer Processes
Extrusion
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Blessing Olakigbe
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What is
extrusion
Used to produce solid rod, hollow tube,
angle
, sections(I and T), channels in
polymers
What is
extrusion
used for
Can be used to coat electrical wires with
polymer
e.g PVC for
insulation
How is
extrusion
carried out
1.Poly
granules loaded into hopper
2.Archimedean
screw moves granules past heater
3.Heaters
soften
polymer
4.Sufficient polymer melted,
hydraulic
ram pushed screw, forcing polymer through
steel
die
5.Extrusion may be supported by
rollers
as it leaves, cooled by
water
or air
6 Extrusion cut to desired
length
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