KWH Plast launches oxygen-barrier IML films

KWH Plast has launched a range of oxygen-barrier IML films. The company has combined its expertise in in-mold labeling and packaging films with special properties such as oxygen barriers. Oxygen barrier properties can be attained by using special polymers such as Ethylene Vinyl Alcohol (EvOH).

‘The challenge of producing any IML film is to control the static film properties, to ensure film flatness and to have the right mechanical properties for a smooth printing process,’ said the company in a statement. ‘KWH Plast has been successful in attaining these properties, first with standard cast IML films and now with seven-layer oxygen-barrier IML films.’

The new range is aimed at providing the industry with lighter weight, injection-molded packaging as an alternative to tin cans and glass jars. Existing injection-molded packaging can be upgraded to barrier-packaging. Some restrictions apply: the package design and the injection-molding equipment must allow for the use of an IML label covering the whole package.

The Oxygen Transmission Rate (OTR) of films developed by KWH Plast ranges from 1 to 3 cc/m2*d (23 deg C, 65 percent RH). These are typical values needed to ensure the required shelf-life of most foodstuffs, says the company.

The company reports that the performance of its oxygen-barrier IML films is comparable to its standard cast IML film, with good anti-static properties allowing for a smooth printing process. Tests reportedly show positive results with different PP raw materials, while good bonding means that the label can’t be peeled off after injection-molding.

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