Bioresource Processing Research Institute of Australia, Department of Chemical Engineering, Monash University, Melbourne, Victoria 3800, Australia.
Carbohydr Polym. 2020 Apr 15;234:115900. doi: 10.1016/j.carbpol.2020.115900. Epub 2020 Jan 22.
The global abundance of recycled pulp has introduced opportunities for cellulose nanofiber (CNF) production at lower energy due to the partially fibrillated nature of recycled pulp. This study investigated the potential of recycled pulp as a feedstock for CNF production, comparing recycled bleached de-inked pulp (DIP) predominantly from eucalyptus fibers with virgin bleached eucalyptus kraft (BEK) pulp. The specific energy consumption for CNF production with 10,000 PFI refiner revolutions and 1 homogenization pass was 7 % lower with recycled pulp. At this treatment level, fiber characterization experiments revealed that the CNF from recycled pulp had a median diameter of 19 nm and aspect ratio was 140, similar to that from virgin pulp. The tensile index of unrefined BEK sheets (30 Nm/g) almost doubled (55 Nm/g) when reinforced with only 20 wt% DIP CNF. This work demonstrates that recycled pulp is a viable alternative to virgin pulp feedstocks for CNF production.
由于再生纸浆的部分纤维化性质，全球再生纸浆的丰富供应为纤维素纳米纤维（CNF）的生产提供了更低能耗的机会。本研究调查了再生纸浆作为 CNF 生产原料的潜力，将主要由桉树纤维制成的再生漂白脱墨浆（DIP）与原生漂白桉木牛皮浆（BEK）进行了比较。在 PFI 打浆机 10000 转和 1 次均浆的条件下，生产 CNF 的比能耗降低了 7%。在该处理水平下，纤维特性实验表明，再生纸浆制得的 CNF 的中值直径为 19nm，长宽比为 140，与原生浆制得的 CNF 相似。仅用 20wt% DIP CNF 增强时，未精制 BEK 片材的抗张指数（30Nm/g）几乎翻了一番（55Nm/g）。这项工作表明，再生纸浆是 CNF 生产中替代原生纸浆原料的可行选择。
