TAPPI T279 PDF

Effective Fiber Length Index by Zero/Short -Span Tensile Testing

TAPPI T279 – Effective Fiber Length Index by Zero/Short -Span Tensile Testing

This method provides a measure of the effective length of the fibers in a random, standard aggregate of pulp fibers based on wet zero-span tensile testing.The test requires a zero-span tensile apparatus as described in TAPPI T 273, with the capability not only to conduct a wet zero-span tensile test, but also to conduct the same test with an initial jaw separation of 0.4 mm.The short-span (0.4 mm) tensile strength of the random array of wetted fibers when expressed as a ratio of the zero-span tensile strength of the same wet fiber aggregate, is a measure of the effective length of the fibers in the aggregate.