Fast setting corrugating adhesive.

摘要

The presence of both soluble and insoluble polyvinyl alcohol in a corrugating adhesive containing starch, a boric acid compound, and sodium hydroxide results in substantially increased bond strength and water resistance. The soluble and insoluble fractions of the polyvinyl alcohol composition cooperate during heating of a glue line in a corrugated board product to first rapidly form a strong green bond at the gel temperature of the starch, and then to form a still stronger cured glue line. The corrugating adhesives of the invention can be used without fear of useless gel formation or delamination of the corrugated board in high speed production.