PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 10, Number 2, 2024
70%, and 80%) and technology substitution scenarios were designed from the provincial perspective. The results indicate that the current carbon emissions and energy consumption (CEEC) of paper from wood pulp are 13.51Mt CO 2 equiv and 7.05 million GJ, respectively. Based on an 80% recovery rate and the adoption of advanced pulping technologies, the national CEEC can be reduced by 32.4% and 50.06%, respectively. In economic terms, advanced pulping technology application can increase total revenue by 30.2%. With the implementation of the optimal waste management programs, the national CEEC can be reduced by 27.8% and 65.3%, respectively. FILLERS “Production of recycled paper using harmless municipal sludge as a new biomass filler”, Hao Sun , Xiyu Chen , Lingjun Wei EMAIL logo , Jieyu Cui , Wanlu Zhang & Longfei Liu, Nordic Pulp & Paper Research Journal , https://doi.org/10.1515/npprj- 2024-0007. Due to a shortage of resources, exploring new biomass fillers has become critical for paper making. In this study, we reported an eco-friendly strategy for fabricating low-cost and efficient recycled paper with high mechanical properties using corrugated cardboard waste paper and harmless municipal sludge (HMS). First, the characteristics of HMS, including the particle size, pH, specific surface area, organic functional groups and organic component content, were analyzed. Then, the influence of the amount of HMS on the properties of the recycled paper was studied. Finally, the strengthening mechanism of biomass filling recycled paper was discussed. The results showed that HMS, a biomass filler for recycled paper preparation, exhibited excellent physical and chemical properties, with a median particle size of 6.395μm, a surface area of 39.974m 2 g −1 and organic functional groups. The tensile index of the recycled paper with 30% HMS was 13.10Nm/g, which was 16.4% greater than that of the unfilled paper and showed better thermal stability. This excellent performance could be attributed to the uniform distribution of HMS on the fiber surface, which improved the accessibility of hydrogen bond formation between fibers. Thus, this study proved that HMS was an excellent biomass filler for producing recycled paper. MOULDED PULP “Development of a beverage carton closure cap based on 100% wood pulp fibres”, Gary Chinga-Carrasco, Jost Ruwoldt, Eva Pasquier, Marianne Øksnes Dalheim & Martin K. Wieser, Journal of Cleaner Production , Vol.445, 15 March 2024, 141339. Single-use plastic products have been identified as an environmental challenge. When such products are not recycled, they may end up in nature and thus cause, e.g., marine littering. Thermoformed wood pulp fibre products are gaining more interest to replace fossil plastic products. However, beverage caps made of wood pulp fibres are challenging due to the hygroscopic nature of wood fibres, i.e., they absorb water, deform and loose functionality. Hence, the purpose of this study was to develop a fibre-based beverage cap that could replace plastic tethered cap systems. Both unbleached and bleached Kraft pulp and chemo-thermo-mechanical pulp (CTMP) fibres were tested in thermoforming trials, using tailor-made metal moulds. The results showed that Kraft pulp fibres formed denser structures, with more limited water absorption, compared to CTMP. The mechanical properties of thermoformed specimens were suitable for the application, i.e., the strength, modulus and elongation were between 32 and 36 MPa, 4 – 4.9 GPa and 1.6 – 1.9%, respectively, depending on the type of pulp fibre. Additionally, in order to secure that the caps were functional in relevant conditions in contact with liquids (water or milk), the caps were surface modified by silylation and esterification to increase the liquid barrier. The results indicate that surface esterification increased the contact angle to 95°. On the other hand, the surface-modified caps could not entirely limit the liquid absorption over longer
Page 3 of 10
Technical Abstracts
Made with FlippingBook Online newsletter maker