PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 7, Number 1, 2021
molded pulp trays fabricated from 70% sized frond fibers and 30% OCC fiber provided 7.71% higher compressive strength than neat OCC tray. All physical properties indicated that the as-prepared trays have potential use for protective material. A simulation with green apple demonstrated that the trays were impractical for use with soft-skinned fruit as the dense and rough surface of the packaging. Further study to evaluate cushioning performance for harder skin fruit is, therefore, necessary. “ The impact of molded pulp product process on the mechanical properties of molded Bleached Chemi-Thermo-Mechanical Pulp ”, Claire Dislaire, Yves Grohens, Bastien Seantier & Marion Muzy, Functional Composite Materials , 2, Article 7 (2021). This study was carried out using bleached softwood Chemi-Thermo-Mechanical Pulp to evaluate the influence of Molded Pulp Products’ manufacturing process parameters on the finished products’ mechanical and hygroscopic properties. A Taguchi table was done to make 8 tests with specific process parameters such as moulds temperature, pulping time, drying time, and pressing time. The results of these tests were used to obtain an optimized manufacturing process with improved mechanical properties and a lower water uptake after sorption analysis and water immersion. The optimized process parameters allowed us to improve the Young’ Modulus after 30h immersion of 58% and a water uptake reduction of 78% with the first 8 tests done. NANO-SCIENCE “ Reinforcement Potential of Modified Nanofibrillated Cellulose in Recycled Paper Production ”, Ayhan Tozluoglu, Hakan Fidan, Ahmet Tutuş, Recai Arslan, Selva Sertkaya, Bayram Poyraz, Sibel Dikmen Küçük, Tamer Sözbir, Bekir Yemşen & Mehmet Onurhan Gücüş , BioResources , 16(1), (2021), OPEN ACCESS. The influence of nanofibrillated cellulose (NFC) was investigated as a reinforcing agent to improve strength properties of papersheets fabricated from recycled pulp fibers of mixtures of old newspapers, old magazines, and old corrugated cardboards. To determine the effects of the NFC on the mechanical and physical properties of the recycled pulp papers, cellulose nanofibrils (NFC) were isolated from wheat straw, pretreated chemically and enzymatically (NFC-OX), and then added to the bulk suspensions of papermaking pulp slurries at various percentages. The electrokinetic and drainage properties of the pulps and the mechanical and physical properties of the papersheets were analyzed and compared. As expected, the addition of NFC/NFC-OX significantly increased the strength properties of papers. Papers containing 4% of NFC-OX (periodate pretreated) presented higher increases in tensile index (43%) and burst index (59.3%) than other papers. However, a high addition of NFC/NFC-OX increased the water retention, which is undesirable for papermaking. Hence, with optimum selection of NFC/NFC-OX and process conditions, higher mechanical properties could be acquired without increasing drainage rate. Compared to the other pretreated NFC/NFC-OX types, sodium-periodate-oxidized NFC-OX samples significantly increased the mechanical properties of the papers fabricated from the recycled pulps. “Chapter 10: Applications of Nanocellulose in the Paper Industry”, Hye Jung Youn & Hak Lae Lee, in Nanocellulose: Synthesis, Structure, Properties and Applications , 323-357 (2021). Nanocellulose, due to its sustainability, biodegradability, and high performance such as high tensile stiffness and low thermal expansion coefficient, can potentially replace the fossil fuel-based materials for different applications. Among them, paper and the board industry is the most promising field because of the massive product tonnage of paper. It can be used both as a dry and wet-end in the paper industry such as papermaking, paper coating, packaging, and for the production of hygienic and absorbent
Technical Abstracts
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