%0 Journal Article
%A Negro Álvarez, Carlos Manuel
%A Pettersson, Gunilla
%A Mattsson, Amanda
%A Nyström, Staffan
%A Sánchez Salvador, José Luis
%A Blanco Suárez, María Ángeles
%A Engstrand, Per
%T Synergies between fibrillated nanocellulose and hot-pressing of papers obtained from high-yield pulp
%D 2023
%U https://hdl.handle.net/20.500.14352/104080
%X To extend the application of cost-effective high-yield pulps in packaging, strength and barrier properties are improved by advanced-strength additives or by hot-pressing. The aim of this study is to assess the synergic effects between the two approaches by using nanocellulose as a bulk additive, and by hot-pressing technology. Due to the synergic effect, dry strength increases by 118% while individual improvements are 31% by nanocellulose and 92% by hot-pressing. This effect is higher for mechanical fibrillated cellulose. After hot-pressing, all papers retain more than 22% of their dry strength. Hot-pressing greatly increases the paper’s ability to withstand compressive forces applied in short periods of time by 84%, with a further 30% increase due to the synergic effect of the fibrillated nanocellulose. Hot-pressing and the fibrillated cellulose greatly decrease air permeability (80% and 68%, respectively) for refining pretreated samples, due to the increased fiber flexibility, which increase up to 90% using the combined effect. The tear index increases with the addition of nanocellulose, but this effect is lost after hot-pressing. In general, fibrillation degree has a small effect which means that low- cost nanocellulose could be used in hot-pressed papers, providing products with a good strength and barrier capacity.
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