Abstract
Novel composite packaging materials based on „clever paper“ (CP) (a mixture of polyethylene with calcium carbonate in a mass ratio of ∼1:1) with a coating layer of biodegradable polymers – corn starch (St) and sodium alginate (Alg) with and without activated carbon – were tested to determine their barrier properties against several substances (undecane, heptadecane, dodecane, triethylcitrate, dipropylphthalate, 4-methylbenzophenone, cholestane) that simulate the migratable contaminants from recycled paperboard. Industrial samples of synthetic films (LDPE, BOPP, BOPET, EVA, PLA, PVA), as well as films based on starch/alginate (St/Alg) blends (St/Alg 90/10 and St/Alg 50/50) have been tested as well. Good barrier properties against the penetration of mineral oils (less than 5% undecane has permeated after 10 days at 40 °C) were demonstrated by the film based on St/Alg 90/10. The coating of CP by a layer consisting of St/Alg 90/10 and activated carbon (AC) yielded the composite material CP/St/Alg 90/10/AC with very low permeability (close to aluminum foil). To further showcase the effectiveness of starch/alginate coatings against penetration of contaminants, additional tests were performed with purchased recycled paper coated by films based on St/Alg 70/30.
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