Mineral oils can seep from packaging into foods. Residues can even leak through intermediate packaging and transfer to the product. A test done by Stiftung Warentest which was published on 26 November 2012 detected traces of mineral oil in advent calendar chocolate. In some of the samples testers found more than 10 milligrams of mineral oil per kilo of chocolate. A number of different reasons that are thought to be responsible for this. Mineral oils and compounds with oil-like properties can seep from both printing inks and plastic packaging. These printing inks also have a negative impact on paper recycling. When these inks are used on recycled paper, the paper may again contain mineral oils which is then transferred to foods. Other potential source points of mineral oils traced in foods are the machine oils used in production equipment and in packaging made of recycled paper that is used in transport. An effective block in the packaging of high-risk foods is necessary to protect consumers. These solutions are already on the market, and great efforts are in progress to further develop appropriate concepts.
Nevertheless, packaging made of recycled paper is still more ecological and sustainable than virgin fibre packaging. This advantage can be further increased if mineral oil-free inks are used in paper printing, and in newspaper printing in particular. If newspaper printers used mineral oil-free inks only, they could prevent more than 60,000 tons of mineral oil from entering the paper cycle. The additional costs are estimated to run at 1 to 2 cents per newspaper. Printing ink manufacturers declare that they can supply mineral oil-free printing inks as soon as there is demand. A number of different companies are already leading by example. The Report Verlagsgesellschaft mbH in Bocholt has been using mineral oil-free inks for newspaper printing since January 2012. The company uses a web offset coldset process. Many supermarket chains are using mineral oil-free inks to print their customer newsletters. The Federal Environment Agency prints all of its publications with mineral-oil free inks using a sheet fed offset-heatset process.
Says Jochen Flasbarth, “It is crucial for all the players in the value added chain to help reduce the input of mineral oil into the material cycle. By using mineral oil-free printing inks, a great step is made in this direction directly at source. This is sustainable both in terms of consumer protection and environmental protection.” German publishers and printers are called upon as important players in the paper recycling loop to translate the successes of a few individual companies in mineral oil-free printing and adopt them for the production of press products on a large scale.
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