Negro Álvarez, Carlos ManuelPettersson, GunillaMattsson, AmandaNyström, StaffanSánchez Salvador, José LuisBlanco Suárez, María ÁngelesEngstrand, Per2024-05-162024-05-162023-06-25Negro, C.; Pettersson, G.; Mattsson, A.; Nyström, S.; Sanchez-Salvador, J.L.; Blanco, A.; Engstrand, P. Synergies between Fibrillated Nanocellulose and Hot-Pressing of Papers Obtained from High-Yield Pulp. Nanomaterials 2023, 13, 1931. https://doi.org/10.3390/nano1313193110.3390/nano13131931https://hdl.handle.net/20.500.14352/1040802023 Descuentos MDPITo 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.engAttribution 4.0 Internationaljournal article2079-4991https://doi.org/10.3390/nano13131931open access54676Hot-pressing technologyMicrocelluloseCellulose nanofibersNanocelluloseHigh-yield pulpCTMPPaper qualityPackagingQuímicaIndustria del papel23 Química2303.99 Otras