PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 4, Number 1, 2018
Environmental performance of straw-based pulp making: A life cycle perspective, Mingxing Sun et al , Science of The Total Environment , Vol.616 – 617. Agricultural straw-based pulp making plays a vital role in pulp and paper industry, especially in forest deficient countries such as China. However, the environmental performance of straw- based pulp has scarcely been studied. A life cycle assessment on wheat straw-based pulp making in China was conducted to fill of the gaps in comprehensive environmental assessments of agricultural straw-based pulp making. Environmental Aspect of Using Chlorine Dioxide to Improve Effluent and Pulp Quality During Wheat Straw Bleaching, Daljeet Kaur et al , Waste and Biomass Valorization , online. This paper illustrates the need of using the agro waste (wheat straw) as a substitute for forest products in paper industry. It aims on using the soda-AQ pulping process for converting waste to fibrous pulp. Further, it emphasizes on use of chlorine dioxide in place of elemental chlorine and hypochlorite during bleaching with aim of reducing the wastewater load and improving the pulp quality. TESTING On the origin of sorption hysteresis in cellulosic materials, Lennart Salmén & Per A. Larsson, Carbohydrate Polymers , Vol.182. Moisture sorption and moisture sorption hysteresis of carbohydrates are phenomena which affect the utilisation of products made thereof. Although extensively studied, there is still no consensus regarding the mechanisms behind sorption hysteresis. This article reviews how different chemical and physical modifications affect the phenomenon. Molecular deformation of wood and cellulose studied by near infrared spectroscopy, Fei Guo and Clemens M. Altaner, Carbohydrate Polymers , Vol.197. Wood (Eucalyptus regnans and Pinus radiata) and paper samples were stretched to different strain levels using a purpose-built tensile test device fitted into a near infrared (NIR) spectrometer while collecting transmission spectra. Consistent spectral changes caused by mechanical strain, assigned to OH stretching bands, were observed. Water retention value for characterizing fibrillation degree of cellulosic fibers at micro and nanometer scales, Feng Gu et al , Cellulose , online. This study examined in detail the utility and validity of water retention value (WRV) for characterizing the extent of fibrillation of micro and nanofibrils. A bleached pulp fibre sample was either refined to different degrees using a PFI mill or milled for different time periods using a SuperMassColloider (SMC), to produce micro and nanofibril samples. These fibril samples were then characterized by electronic microscopic imaging (SEM and TEM), degree of polymerization (DP), Canadian Standard Freeness (CSF), enzymatic adsorption (EA), enzymatic cellulose digestibility (ED), as well as WRV measured under different relative centrifugation forces and durations. Dielectric Losses of Paper in the THz Domain: Literature Review, Needs for Future Research, and Prospective Solutions, Patrick Huber et al , Physica Status Solidi , Vol.212 (12). High frequency paper Ǧ based electronics is developing fast, with smart yet low cost applications in view. However, the dielectric losses of paper remain a difficult hurdle to overcome. First, the literature on the topic is reviewed and the contributions from moisture, air, mineral filler, and wood constituents to dielectric losses are highlighted. Then, the guidelines for future research are defined, including the need for systematic comparisons in controlled moisture conditions. In an effort to produce low loss materials
Technical Abstracts
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