THE EDGE CRUSH TEST (ECT): ITS RELATIONSHIP TO BOX COMPRESSION AND ITS DERIVATION FROM CONTAINERBOARD EDGE STIFFNESS

• The edges crush test (ECT) using a short column specimen is an important test for the box maker.
• Procedures for making the test are discussed in TAPPI T 811 "Edgewise Compressive Strength of Corrugated Fiberboard (Short Column Test)." For accurate and reproducible results these procedures should be followed in detail.
• This reduces chatter of the corrugated board as it is being cut. Knife cutters (single knife with guides or twin knife models) are also allowed in T 811. Single bevel knife blades are necessary in these cutters.
• The test specimen should have its edges reinforced with paraffin to prevent edge failures per T 811.

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