DANSK DS/ISO 3039 PDF

This International Standard specifies a method for determining the grammage of the component layers from which corrugated fibreboard has been made. This International Standard is applicable to all types of corrugated fibreboard. NOTE This standard describes a procedure were the separated component layers are allowed to dry freely, i.e. unrestrained. In 2008 an international round-robin was performed to compare precision data between the two drying procedures free drying, which may involve shrinkage, and restraint drying, where the layers are prevented from shrinking. As no statistical provable difference in the repeatability and the reproducibility between the two drying procedures were observed the faster and simpler procedure, i.e. the free drying, was chosen for this standard. Precision data for free drying are given in Annex A.