WATER RESISTANT CORRUGATED ARTICLES HAVING IMPROVED FOLD FLEXIBILITY

摘要

A method for forming a flexible fold in corrugated paperboard rendered water resistant by impregnation with a solidifiable water proofing agent that imparts rigidity to the paperboard in which the fold is first treated with a non-rigid polymer pretreating agent prior to impregnation and a water resistant corrugated article having folds rendered flexible by this method. The method is particularly useful in manufacturing water resistant corrugated paperboard boxes having improved fold flexibility.