Applications / UHT Milk Pouch / Barrier structures with EVAL™

UHT Milk Pouch

Introducing the portable cow.

Adding high performance to UHT milk pouches

1mm of EVAL™ has the same barrier properties as a 10 metre-thick wall of LDPE. With such performance, an EVAL™ layer thickness of several microns is enough to provide the required barrier protection.   A layer of only 5µ of EVAL™ H171B (total film thickness 85µ) is commonly used to obtain a shelf life of 90-120 days for UHT milk pouch packaging.

Pouches can be made with a 5-layer coextruded film structure by adding a black masterbatch (for light barrier) to one of the tie layers.  Consult with your tie layer provider for suitable grades. Alternatively, a direct food contact compliant masterbatch can be used in the sealant layer.

UHT 5 layer

If it is possible to make a 7-layer structure, the different layers can be optimised further, each with its individual function::

UHT 7 layer

CowMore?

For more information on barrier UHT milk pouches with EVAL™, please contact us.