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THE KAUTEX BARRIER TECHNOLOGY
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Principle
Plastics, especially the polyolefin (PE) group have many useful properties but
are not completely impermeable to very volatile substances and oxygen. This means
that molecules of the contents can migrate outwards through the vessel walls and
that oxygen can migrate inwards to the contents. This process is known as permeation.
The Kautex barrier methods make HDPE in particular virtually impermeable to hydrophobic,
aromatic and aliphatic substances.
Among the main areas of application are:
Chemical products with high permeation rates,
Fuels, domestic fuel additives,
Colours, lacquers, solvents,
Crop protection agents,
Oxygen-sensitive substances.
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Arrangement of bottle wall layers
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Coextrusion blow moulding
Tailor-made combinations of materials with from 3 to 6 layers of barrier materials
in accordance with the customer's requirements.
The layers used in the two most common material combinations:
HDPE ---- HV - EVOH - HV ---- HDPE
HDPE ---- HV - PA (inside)
HDPE = the container wall.
HV = coupling agent between HDPE and the barrier material.
EVOH (ethylene vinyl alcohol) and PA (polyamide) are the barrier materials most
often used.
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Enlarged cross-section of bottle wall
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Selar technology
Selar contains PA (polyamide) as barrier material.
During the extrusion process selar is worked into the HDPE carrier mass in such
a way that overlapping sheets of PA are formed; these are bound to the HDPE with
the coupling agent.
This labyrinth consisting of uncountable PS sheets is an effective barrier.
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Enlarged cross-section of bottle wall
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Fluorination
In this method gaseous fluorine is led into the hollow body during the blow moulding
process or the finished hollow body is treated with fluorine in a vacuum chamber.
Fluorine reacts with the HDPE surface and forms an effective barrier which is
similar to Teflon.
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CJK Packaging Ltd., Bridgeholme Industrial Estate, Chinley, High Peak, Derbyshire, SK23 6DX, United Kingdom : Telephone +44 (0)1663 750222 : Fax +44 (0)1663 750333
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