In the corrugated gum powder the polymers within the starch, upon gelatinization absorb water and during cooling get entangled with paper fibres and thereby bridge the two sheets of paper. It lowers the consumption of glue, maintains viscosity and solid content and ensures good bonding due to low gelatinization. This adhesive usually has some quantity of free starch and un-gelatinized starch, the free starch gets gelatinized by the heat of corrugating medium and gives a stronger bonding.