TPT July 2007

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Plastic & C omposite Tube: Products & Manufacture
90 July /August 2007
Manufacturers can significantly reduce
feedstock costs for PVC pipe by increasing
filler content. The engineering challenge
is to guarantee a stable process and
consistently good product quality, even for
highly filled pipe.
Krauss-Maffei, Germany, manufactures
36D twin-screw extruders that have
proved successful in processing highly-
filled formulations. For PVC wastewater
pipe, filler content of up to 65 parts
(approximately 40 per cent) chalk (CaCO3)
is feasible. Highly filled pipes with diameters
between 50mm and 500mm are used for
transporting wastewater.
To facilitate processing of highly filled
formulations, the extruders have special
material feed, weighing and metering
systems. The PVC
dryblend and the
CaCO3 are transported
from the storage
container to the hopper
of the gravimetric
metering unit with the
help of a spiral feed
screw.
The hopper is fitted with
shakers and agitators
to prevent bridging. In
addition, all metering
unit surfaces in contact
with the material have
a special coating to
guarantee unimpeded
material flow. From
the metering unit, the
material is transported via an agitator and a
special twin-screw feed into the stuffing unit
above the extruder feed throat.
The parallel twin-screw extruders in Krauss-
Maffei’s 36D range are designed for optimal
processing of PVC. They are capable of
combining very high output with maximum
protection for the mechanical properties
of the product. The 36D extruders have
internally heated screws and air-cooled
barrels. They are offered in four sizes: KMD
75-36, KMD 90-36, KMD 114-36 and KMD
133-36.
The rheological design of Krauss-
Maffei’s spider-type pipeheads ensures
a homogenous melt and ensures perfect
fusing of the melt downstream of the spider
legs.
Hakan Plastik AS, Turkey, specialises in
manufacturing highly-filled PVC pipe. The
company already operates five Krauss-
Maffei extrusion lines for this application,
and has ordered two more lines which went
into operation earlier this year.
Krauss-Maffei Kunststofftechnik GmbH
– Germany
Fax: +49 8988 99 2206
Website:
Major industry study into
plastic pressure piping
Hillinger+Partner, Germany, has announced
the completion of a 1,000+ page market
study, titled Plastic Pressure Piping
Products (PPPP) – World Market. The
study, which is available in both German
and English language versions, contains
deep analysis, and quantitative and
qualitative descriptions of the world market
of valves, fittings, pipes, flow measuring
and control, and plastics including ABS,
PB, PE, PP, PFA, PVC, and PVDF.
The study contains 500 images and
illustrations, 220 pages of concise tables,
and clear definitions with more than 100
market segments and target groups. Also
included are 100 double-sided competitor
profiles with turnovers, employees,
essential information about the company,
and strengths and weaknesses, and a
listing of more than 3,700 main customers
along with their purchasing potential.
Hillinger+Partner – Germany
Fax: +49 7231 70457
Email:
Website:
Loose aluminium flanges for PE/PVC plastic pipes
Fonderia Fazzini Srl, Italy, produces loose aluminium flanges for PE and PVC plastic
pipes, branded FF-PL and FF-PV. Loose aluminium flanges are an alternative to those
made from other materials as they
benefit from aluminium characteristics
including light, hard, corrosion
resistance, and cost efficiency.
The inside diameter of these flanges
is qualified for plastic pipes according
to UNI-DIN standard. The mating
dimensions are in accordance with
the EN 1092-1 PN10/16 standard.
The aluminium flanges can be
supplied blank, sand-blasted or
coated, and are manufactured from
EN AC-47000 aluminium alloy.
With 40 years of experience in
aluminium flanges, the company
produces a wide range, not only for
plastic pipes, but also for steel pipes.
Fonderia Fazzini Srl – Italy
Fax: +39 0331 263025
Email:
Website :
Higher filler content saves costs in
PVC pipe production
fi The twin-screw extruders in Krauss-Maffei’s 36D series are engineered
specifically for processing PVC
› The loose aluminium flanges for use with PE/PVC
plastic pipes