German Firms Develop Adhesive-Free Paper Sealing Technologies for Improved Recycling

The Challenge of Adhesives in Paper Recycling

While paper and cardboard packaging are recyclable, the glues and labels used on them, known as "stickies," can compromise the recycling process. These non-recyclable adhesives can damage recycling machinery, degrade the quality of recycled paper, or lead to entire batches being rejected, according to NC State University scientists.

New European Regulations Drive Innovation

European authorities are pushing for higher recycling standards. New Europe-wide packaging and packaging waste regulations (PPWR) mandate that all packaging must be a minimum of 70% recyclable by 2030, increasing to 80% by 2038. German law will also introduce stricter reporting and licensing fees, creating an incentive for companies to find better recycling solutions.

Adhesive-Free Sealing Technologies Emerge

In response to these challenges, three German firms—Fraunhofer, Hermann Ultraschall, and Henkel—are developing methods to seal paper without adhesives. Fraunhofer established the PAPURE project in 2023 to create a laser-based heating process for sealing paper packaging. The project is set to conclude in September, with Fraunhofer seeking an industry partner to commercialize the technology within two years.

Ultrasonic Sealing Technology

Also in 2023, engineering firm Hermann Ultraschall acquired the rights to develop a patented ultrasonic paper sealing technology. This process is described as similar to welding, offering another adhesive-free solution for paper packaging.