A new manufacturing process uses lasers to seal paper packaging instead of glue

"The new sealing process involves analyzing the chemical composition of various paper types to determine if they can be sealed without an additive, ensuring the quality of the final product."

"Once approved, the paper is irradiated with a CO laser, which rapidly heats its surface, converting lignin, hemicellulose, and cellulose into short-chain compounds that act like a natural glue."

"Current testing indicates that a 2cm seal, just 3mm wide, can support a load of 44 pounds, demonstrating the strength and effectiveness of the new sealing method."

"A laboratory-scale modular paper processing manufacturing unit has been built, capable of producing a flat, four-sided paper bag design, showcasing the practical application of the Papure project."

Researchers at four Fraunhofer institutes in Germany have created a new method for sealing paper packaging without adhesives or plastic. This process utilizes a carbon monoxide laser to heat the paper's surface, transforming its natural components into a glue-like substance that forms a strong seal. The method involves analyzing the paper's chemical composition to ensure compatibility with the sealing process. Current tests show that the seals can support significant weight, and a modular manufacturing unit has been developed for practical applications.

Read at The Verge