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AIMS AND OBJECTIVES
Ÿ
To share breakthroughs and happenings in the
Polymer & Extruder Industry.
Ÿ
To serve as an information sharing platform for
STUDENTS, ENGINEERS and COMPOUNDERS.
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To generate triggers and encourage contributions
from scientists technocrats and teaching
community for new innovations.
The Extruder Processing Zone (EPZ) is the ‘heart’ of a Co-rotating Twin-Screw Extruder
that helps to achieve the desired performance.
Work done in the Extruder Processing Zone results in the desired quality of compounded
material and levels of output in a co-rotating twin-screw extruder. In the EPZ, several
actions are carried out as the material as it works its way through the extruder and exits
from the die. Depending on the nature of work being carried out, these zones are called
Intake, Melting, Atmospheric Venting, Mixing, Vacuum Venting and Metering. Properly
configured zone with the right choice of elements and barrels optimizes the performance
of each zone. Solids conveying in Intake, Softening of Polymer in Melting, Degassing in
Venting, Dispersion and Distribution accompanied by Kneading action in Mixing,
Discharge control in Metering are the functions of the various zones.
Conveying screws, Kneading Blocks and other Mixing Elements are the working members
in each zone. Making the right selection among numerous elements and configuring
them in the right order needs understanding of the functional characteristics of each
element. This article attempts to throw further light in understanding the zones and
characteristics of element.
THE
HEART OF A
TWIN SCREW EXTRUDER IS
R E V I E W
SCS
STEER CONSULTANCY SERVICES
IN THIS ISSUE:
This issue of ET is sponsored by
USA - JAPAN - EUROPE - INDIA
WA T C H O U T !
Review:
Brainstorm:
Question 4 You:
The heart of a Twin Screw Extruder
is the Extruder Processing Zone (
EPZ
)
Dispersion Improvement
1.
‘
H
ighest value end uses’ of recycle PET.
2. Ideal ‘residence time’ in a TSE.
I n t h e n e x t i s s u e o f Ex t r u d e r Time s t h e
ma i n r e v i ew a r t i c l e wo u l d b e o n
“WOOD PLAST I C COMPOS I TES ”
ISSUE-05
JANUARY-MARCH 2008