MATERIALS | BARRIER FILM


Using two nylon layers is appropriate for high barrier film – and also extends mechanical and optical properties. Alternatively, a single outer nylon layer – combined with several PP layers, for instance – can be used in medium barrier packaging. At the same event, Kompuestos of Spain


presented details of an advanced oxygen barrier for food packaging. It says that incorporating nanoclays into EVOH can improve its hermetic properties. It does this by increasing the ‘tortuous path’ that gas molecules must take in order to penetrate the material.


Adding a substance such as kaolin to EVOH, for


Above: Barrier film can help to contain


fumigants such as methylene bromide, when spraying crops


by developing a nylon grade that can be used in the outer layer. Ordinarily, barrier layers like nylon comprise one


of the inner layers of a multi-layer film structure. This is because if they absorb moisture, their gas barrier generally suffers. However, Ube’s hydrolysis- resistant 5033FD8 grade has been used in asym- metric film structures – in which the nylon consti- tutes the first and third layers in a five-layer design, for instance.


instance, can produce a steep drop in oxygen transport. Because of this, it means that the thickness of the EVOH layer can be reduced by 50% – which saves around 30% in material costs.


CLICK ON THE LINKS FOR MORE INFORMATION: � www.ncsu.edu � www.novachem.com � www.aschulman.com � www.evalevoh.com � www.ube.com � www.kompuestos.com


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