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Bond setting in the corrugating operation

The rate of dehydration of corrugating starch adhesive (raw starch granules in cooked starch solution) against paperboard has been measured and compared to the rate of sorption of water vapor and of liquid water by the board. It is concluded that molecular diffusion of water into fiber walls is the predominant mechanism of dehydration of the starch adhesive. Capillary movement of the aqueous adhesive may help increasing dehydration rate by increasing the interfacial area for diffusion. Sizing, by retarding or suppressing this capillary movement, may slow down adhesive dehydration and setting.