As an inorganic adhesive for wet lamination, sodium silicate was investigated for effectiveness. The wet lamination between aluminum foil and paper involved a major problem of prevention of curl. For the prevention of curling of laminated products, it was found very effective to add a small amount of hydrogen carbonates of sodium or potassium as a one-liquid hardener. This is found to offer advantages of technically feasible high--speed lamination as well as com- pletely prevented curl, improved heat resistance of lamination materials, odor elimination, and de- creased trapping of flavor. In addition, it features chemical hygiene and cost effectiveness, thus suggesting a very promis- ing agent.
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