KRAFT PULP VISCOSITY AS A PREDICTOR OF PAPER STRENGTH:  ITS USES AND ABUSES, 23TAPPICon

For bleached kraft pulps, two factors - the individual fiber strength and the bond strength that adheres the individual fibers together in the paper matrix governed paper strength. Inherent fiber strength is related to the length of the carbohydrate polymers, also known as the degree of polymerization (DP). Average DP (D)Pis inferred by performing pulp viscosity measurements. Under certain circumstances during kraft pulping and bleaching, the average polymer lengths can be shortened, which results in lower pulp viscosity and may indicate fiber damage. Fiber damage typically manifests itself as a reduction in tear strength for well-bonded handsheets.

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