Paradigm Shift: Improved Dry Strength in Bath Tissue without Affecting Softness, PaperCon 2016

The most commonly used dry strength additives for bath tissue are starch and glyoxylated polyacrylamides (GPAMs). Both additives negatively affect softness (handfeel). A polymeric additive was designed to provide dry strength without having a negative effect on softness. In pilot papermaking studies, the additive provided 20 to 30% improvements in geometric mean tensile (GMT) strength in the bath tissue. In the development phase, creped sheet stiffness was used as a surrogate for handfeel panel testing or TSA (total softness analyzer) analysis, and the new additive produced a sheet with less stiffness than sheets produced with either starch or GPAM. In commercial validation trials, the new polymeric additive was shown to provide dry strength without negatively affecting handfeel or dispersability. Some customers chose to use the added sheet strength to reduce refining (energy savings), to replace softwood (possible furnish cost savings) or to speed up their machines (increased productivity).

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