Herma optimises adhesive for recycling

Packaging specialist Herma has developed a pressure-sensitive adhesive optimised for the recycling process of logistics cartons. The company is thus realising the findings of a study by the University of Graz, according to which such packaging can be recycled far more frequently than previously assumed under the right circumstances.

Provided the recycling processes are right, logistics cartons and folding boxes can be not just four to seven times, as previously assumed, but up to 25 times.. This was the result of a study at the University of Graz in 2021. In order to optimise the recycling of cardboard and paper, Herma has therefore developed a new range of pressure-sensitive adhesives and corresponding adhesive composites. According to the company, these are characterised by the fact that logistics and other labels produced from them cause virtually no adhesive contamination in the recycling process.

The company has now received certification from the Papiertechnische Stiftung (PTS) for five adhesive laminates, i.e. for labelling materials including pressure-sensitive adhesives. The only condition that such a laminate must fulfil according to the PTS certificates: It must not make up more than 25 per cent of the mass of the cardboard packaging.

„However, given the low weight of a label compared to the cardboard used, this condition is probably always fulfilled,“ says Dr Stefan Kissling, Head of Development Adhesives and Special Coatings at Herma Haftmaterial. „It was important for us to have not only the pressure-sensitive adhesives certified, but also the complete laminates. Because this corresponds to the application in practice."