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| LDPE is among the most widely used material for extrusion coating applications.
LDPE is easy to process, provides adequate moisture barrier, has excellent
sealing properties, and is cost effective. |
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| LLDPE, ADPE and PP are all used in extrusion coating when there is specific
performance requirements for the properties they impart. |
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| Liquid packaging is the largest market segment for extrusion coating.
Over recent years, there were three major developments in the growth
of extrusion coated liquid packaging boards. |
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The first development took place when wax-impregnated milk cartons
were replaced by two-sided extrusion coatings. This application
is still commonly used for packaging of pasteurized milk. |
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The second major step happened when peroxide sterilizing was accepted
for the manufacture of aluminum laminated / coated paperboard aseptic
packaging for juices and UHT-milk. |
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| The most recent development was the replacement of aluminum foil by using
oxygen barrier polymers in extrusion coating. This has enabled packaging
of long shelf life products containing vitamins and nutrients, as well as
various flavours. |
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| LLDPE grades are also used for packaging for oily products which require
superior sealing and ESCR properties. |
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Flexible packaging is the second largest market segment in extrusion coating.
About 20 per cent of coating polymers are used for extrusion coating applications
for polymer film, paper and aluminum foil applications. Molten polymers are
increasingly used as a coating or adhesive lamination layer in place of solvent
based lamination. |
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