The firm said that McCain has been using the multilayer-solution made from FKuR resins by the German convertor, Dettmer Verpackungen to package a range of frozen fries in Germany since the start of this year.
FKuR’s Bio-Flex resins have been available in Europe for several years, but the new multilayer film composed of three resins has just been introduced in European test markets. The company claimed other frozen food producers were trialling the new bioplastic and said it hoped to benefit from the current market trend for packaging made from renewable resources which are biodegradable and certified to the ASTM D 6400 standard.
Until recently it was assumed that bioplastics could not be used for multilayer systems as a result of their limited processabilty, said Denise Winkelmann from the firm’s marketing development department.
Characteristics
The resins are based on a blend of PLA and other biodegradable materials. The company’s Bio-flex films are made from a polylactic acid and copolyester compound.
In order achieve the three-tiered film the plastics corporation stressed the importance of the material’s mechanical properties at low temperatures.
“High impact strength and dart drop strength at these temperatures are a must in order to succeed. Low glass-transition temperatures as well as a homogeneous material with excellent distribution of functional additives are the keys to meeting these requirements,“ stated the firm.
FkuR also said that the new compostable packaging’s suitability for frozen products would depend on the structure of the multilayer systems and materials used. However, Winkelmann added that the bioplastic could be fit for spicy frozen food.
Multilayer benefits
Pointing to the advantages of the three-layered film over other monofilms Winkelmann said: “This multilayer allows for the production of a very flexible and extensible film with great stiffness at low temperatures.”
The firm also referred to the strength, chemical resistance and gloss surface of the new film which could set it apart from monofilms on the market.
The innovative new material was manufactured in cooperation with the Fraunhofer Institute UMSICHT, and is made from a combination of plastics from the company’s Bio-Flex range of compostable biofilms.