Researchers at four Fraunhofer institutes in Germany have developed a novel manufacturing process that eliminates the need for glue or plastic in sealing paper packaging. This new method, known as the Papure project, utilizes a carbon monoxide laser to seal paper without compromising its recyclability. The traditional use of adhesives in paper packaging has long posed challenges for recycling due to contamination, but the laser-based approach offers a sustainable solution.
The innovative process involves irradiating paper with a CO laser, which rapidly heats the surface and transforms key compounds into fusible cleavage products. These products act as a natural adhesive, creating a secure seal when heat and pressure are applied. By avoiding the use of traditional additives, the quality of recycled paper is preserved, contributing to a more eco-friendly packaging lifecycle.
Researchers are currently optimizing the Papure project, experimenting with laser intensity and seam design to enhance bond strength. The prototype manufacturing unit is projected to achieve a production rate of 10 packages per minute by September, showcasing the scalability and efficiency of this technology.
Source: The Verge