Definition

Bursting strength is a measure of the force required to break through a given area of combined board as pressure is applied to one side. Bursting strength is commonly referred to as Mullen.

Influence

The bursting strength of linerboard has no discernable direct effect on corrugated combining or converting operations.

Potential Problems

Major bodies of packaging regulation, such as the Uniform Freight Classification, specify minimum bursting strength as one of the criteria for various grades of combined board. The bursting strength of combined board is a direct function of the component linerboard strengths. Thus, facings with Mullen tests below specified minimums may result in combined board that fails to meet grade requirements. Excessive loading of the pressure roll at the single-facer during the combining operation also may reduce combined board busting strength.

Source
McGrattan, W. "Key characteristics of linerboard, corrugating medium, and roll stock mechanical condition and their influence on the manufacture of corrugated products, part 1." Tappi Journal (1990): 99-108.

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