New technologies aim to reduce non-recyclable adhesives in paper packaging, making it more sustainable.

The presence of non-recyclable adhesives in paper packaging can negate its recyclability, causing damage to machinery or resulting in inferior recycled paper. Scientists at NC State University have highlighted this issue, which is particularly significant given that paper is one of the most recycled materials in Europe, with around 74% of paper and board consumed in 2024 being recycled.

Regulatory Pressure

European authorities are pushing firms to improve packaging recyclability, with a new regulation requiring all packaging to be at least 70% recyclable by 2030 and 80% by 2038. German law will also require stricter reporting and licensing fees, prompting companies to innovate. Three German firms - Fraunhofer, Hermann Ultraschall, and Henkel - are developing solutions to tackle non-recyclable adhesives.

Laser-Based Sealing

Fraunhofer's PAPURE project has developed a laser-based heating process to seal paper packaging without adhesives. The project is set to close in September, and Fraunhofer hopes to find an industry partner to take the technology to market. Researcher group leader Fabian Kayatz believes the technology has market potential, saying, 'There are not really many paper sealing technologies without any foreign materials, so it's a great technology and we feel it's likely that we can bring it to market.'

Ultrasonic Sealing and Cold Seal Solutions

Hermann Ultraschall has acquired the rights to develop a patented ultrasonic paper sealing technology, which it likens to welding. The company is in discussions with major players to bring this technology into mass production. Meanwhile, Henkel has launched a cold seal solution that works with barrier-coated paper, making it suitable for food products. This solution is already being used in snack and confectionery products.