Rapeseed Proteins for Paperboard Coating

Protein samples of rapeseed were prepared with different compositions as protein isolate, protein concentrate and acetylated protein concentrate. They showed functional properties which are consolidated in the coating. The manufactured protein samples were tested in a pilot‐scale paperboard coating plant. The results indicated that the use of rapeseed proteins in the coating preparation is technically feasible and that the color and roughness of the coated paperboard show no negative effect on the quality. Industry printing experiments with this coated paperboard achieved the standard quality. Rapeseed protein is investigated as alternative to the high amounts of fossil‐based binder systems used in the paper industry. Due to its specific composition, it might be especially suited for paperboard coating because it shows good techno‐functional properties and in combination with starch can be used as natural binder.