Influence of dry-strength agents on grammage-dependent tensile properties of paper

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Abstract

The tensile properties of paper exhibit a dependence on grammage (weight per unit area) arising from structural and scale-dependent effects. The investigation of this thesis focuses on the grammage dependence of tensile properties and evaluates the property distinction between handsheets formed with and without cationic starch. British standard (ISO 5296-1:2000) handsheets were formed with a Valley Beater in the laboratory using once-dried bleached Kraft pine and birch pulp as raw materials. Handsheets were made at various densities and different addition levels of starch. Physical property tests were performed under TAPPI methods after drying. A dependence of tensile index and specific elastic modulus on grammage was observed, an agreement with that reported in the literature. Further, this was affected by the addition of starch. Different models in respect to the relative bonded area and Weibull model were presented in the literature for quantifying the experimental data. This work provides a clear explanation about the performance of cationic starch on the tensile properties of paper sheets. Furthermore, it is closely related to the papermaking industry concerning the effect of cationic starch on different beating degrees and raw materials.

Layman's Abstract

Overall, cationic starch showed a good dry-strength agent function for improving the tensile index of handsheets due to the additional hydrogen bonds and their positive charge property for increasing the bond strength without changing density and RBA. However, no obvious Weibull-type grammage-dependence was observed in this study, but it did show a suggestion about it on several groups of hand sheets.

Keyword(s)

cationic starch; grammage; paper; specific elastic modulus; tensile index

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