TPT July 2007

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P lastic & Composite Tube: P roducts & Manufacture
87 July/August 2007
Cincinnati Extrusion GmbH, Austria, have
launched the Monos high-performance
extruder series. This extruder generation is
designed to meet current market demands
for high throughput rates and optimal melt
homogeneity, regardless of the materials,
granulates and fillers being processed.
Using these modern single-screw pipe
extruders, gas and water transport pipes
are produced from PE 100 and PE 80
material, smooth and corrugated pipes
from PP-H, PP-B and
PP-R, and corrugated
wastewater pipes
from and all types of
PE 80.
Another top priority
for this technology
is maximum melt
throughput in relation
to screw diameter.
Additional required
attributes are optimal
melt temperature and homogeneity.
With virtually any die concept and also
using mixed in filler materials – even at
back pressures of up to 400 bar – the
specific melt throughput rate remains stable
over the entire screw speed range of
this machine.
Cincinnati has developed
a modular screw concept
for the new 37 D version to
allow for the processing of
all available types of PE and
PP as well as compounds,
reclaims, regrinds and colour
masterbatches. The modular
screw concept also
ensures manageable
provision of spare
parts.
The most common
approach in reducing
unit costs is in the
area of material
expenses. By using a
type of polymer with
a higher E-module, it
is possible to produce
thinner pipe with the same mechanical
properties. ‘Stiff’ PP is such a material,
which also gives pipes a high-quality
appearance. Due to its attributes, it can
be assumed that ‘stiff’ PP will be in great
demand in the future.
However, processing ‘stiff’ PP – with its high
crystallinity at high melt throughput rates
– presents a new challenge to extrusion
equipment manufacturers.
Due to its substantially higher E-module,
the screws must be specially designed with
a completely different geometry. The torque
of the drive and the driving motors must
have sufficient power reserves, especially
for the start-up process.
Another frequently applied method to
reduce material costs is adding fillers,
such as chalk, talcum, barium sulfate or
fibreglass. Currently, compounds with up
to 50 parts of filler content are being used,
where processors must take care that the
required quality standards for the finished
pipe can still be met.
Cincinnati Extrusion GmbH – Austria
Fax: +43 1 610 068
Email:
Website:
Latest single-screw extruder for
PP/PE 100 pipe production
› Figure 5: Consistency in specific melt throughput during ‘stiff’ PP processing
› Figure 4: High crystallinity matrix of ‘stiff’ PP,
Borealis BA 212E
fi Figure 1: The Monos high performance single
screw extruder
fi Figure 2 (bottom): Linear ratio between melt throughput and screw speed for
various types of PE granulate (with and without chalk content)
Figure 3 (below): Modular screw concept for the Monos 37D series