Paper could replace polystyrene packaging.
In Germany, meanwhile, a research team has been developing a process whereby paper bags are made without adhesives. Materials found in paper, you see, already have adhesive properties.
First an initial layer of paper is irradiated with a carbon monoxide laser, causing the cellulose and lignin within to break up – similar to melting sugar. Some of these short chain compounds move to the surface.
With applied heat and pressure, they form a bond with a second layer of paper. The seal can only be broken if destroyed. In tests, a 2cm x 3mm seal withstood 20kg.
Laser is also helping create paper-based security tags. Sustainable glue can be made from tannic acid and maize kernels.
