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TubeExtruded
58 Tube Products International October 2009
AMUT SpA, established in 1958,
manufactures extrusion plants for
processing thermoplastic materials.
Within the automotive industry and in
respect of Euro II/V standards, as regards
small nylon pipes to convey fuels or
hydraulic oils, it has been necessary to
introduce multilayer products (up to five
layers) with barrier layers in EVOH, PBT,
fluoropolymers and functional layers,
such as nylon 12 conductive.
These solutions provide properties
that cannot be achieved by a single
layer pipe, including good flexibility
impact strength and resistance to low
temperatures, stress and cracking
resistance, abrasion resistance,
endurance strength, water absorption
low factor, dimensional strength at
the change of environmental humidity
conditions, and permeability resistance
of hydrocarbons and oils, both hydraulic
and lubricating.
necessary it is manufactured by using
materials with a very high degree of
resistance to corrosion, such as Inconel
or Hastelloy. Based on the particular
geometry, the thickness spreading of the
single layers is not so much influenced
by the variation of the viscosity of the
polymer in transit.
A head is also available for the production
of multilayer corrugated pipes. With this
model it is possible to centre the pipe
wall thickness by acting on the central
mandrel, by keeping the female die
centred with the corrugators moulds.
New generation sizer: The reduced
friction of the extruded material into
the sizer, obtained thanks to recently
developed technologies, has allowed a
reduction in the stress on the pipe and
enabled extrusion speeds of 60-70m/
min, in the case of the five layers.
For very small pipes, openable sizers
are used to facilitate the plant starting
operations.
Vacuum calibration trough: In
consideration of the high calibration
speed, a longer vacuum section allows
Single screw extruders: In order to
obtain perfect control of the metric
weight of the pipe and a constant
distribution of the thickness in the
different layers, it is necessary to use
gravimetric weight control systems. In
the case of fluoropolymers, the alloys
used for the construction of the key-
parts of the extruder are important, in
particular the plasticising unit where,
in order to achieve high resistance to
abrasion and corrosion, some alloys with
a high percentage of nickel are used to
manufacture barrels and screws.
The new geometries of the grooved
feeding bushes (when necessary also
cooled by water), which couple to new
generation plasticising screws, achieve
high outputs by keeping the melt
qualities unchanged and reducing the
energetic consumptions (kW/kg).
Coextrusion head: Designed according
to the technology of flat spirals, when
A new solution for production of
multilayer nylon pipe
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TheWorld of Tube & Pipe Products,Materials &Ancillaries
July 2009