Application Description

DuPont, in conjunction with packaging specialist, Lawson Mardon Morin has developed a permeable packaging film which is ideally suited to soft cheese with surface mold. Lawson Mardon Morin is using the new Expeco® packaging (Extrusion à Perméabilites Contrôlées) for Chamois d'Or cheese and Bon Mayennais camembert.

The paraffin-free package combines a DuPont Bynel® resin layer and Selar® PA 3426 resin layer laminated on paper, replacing traditional cheese packaging whereby cellulose skin is coated on to paraffin paper. The combination of DuPont Bynel® and Selar® resins gives the packaging film specific barrier properties and optimizes the cheese maturation, while it enables full control on the water vapor / oxygen / carbon dioxide gas exchange. The barrier properties of the structure can even be tuned to comply with the maturation and weight loss requirements.

From a consumer point of view, this new package ensures product preservation without affecting flavor. Connoisseurs will love the appetizing surface mold - proof that the cheese has developed into a quality product.

Used as a bonding agent, Bynel® adhesive resins are thermoplastic polymers compatible with a wide range of processes, including extrusion coating. In addition to a variety of physical properties that help the industrial process, one interesting feature is their limited permeability to water vapor.

Selar®PA 3426 is an amorphous nylon resin that provides oxygen and carbon dioxide barrier, as well as optical properties suitable for packaging applications. Its easy-to-extrude nature and thermoforming characteristics make it the ideal candidate for both film and sheet.

Because DuPont cannot anticipate or control the many different conditions under which this information and/or product may be used, it does not guarantee the applicability or the accuracy of this information or the suitability of its products in any given situation. Users of DuPont products should make their own tests to determine the suitability of each such product for their particular purposes. The data listed herein falls within the normal range of product properties but they should not be used to establish specification limits or used alone as the basis of design.

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