the invention concerns a process for producing corrugated board , wherein a biopolymer latex adhesive is used as the corrugating adhesive . the biopolymer latex adhesive can be obtained by extruding a plasticized biopolymer , especially starch , in the presence of a crosslinking agent such as glyoxal . the preparation of the latex adhesive and its application in corrugating operation do not require a gelatinization step , nor the use of caustic soda or borax .