PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 3, Number 2, 2017
Chemically modified cellulose micro- and nanofibrils as paper-strength additives, Rebecca Hollertz et al , Cellulose , 24 (9). Chemically modified cellulose micro- and nanofibrils were successfully used as paper strength additives. Three different kinds of cellulose nanofibrils (CNFs) were studied: carboxymethylated CNFs, periodate-oxidised carboxymethylated CNFs and dopamine-grafted carboxymethylated CNFs, all prepared from bleached chemical fibres of dissolving grade, and one microfibrillated cellulose from unbleached kraft fibres. In addition to mechanical characterization of the final paper sheets the fibril retention, sheet density and sheet morphology were also studied as a function of addition of the four different cellulose fibrils. The effect of PVA foaming characteristics on foam forming, Qiupeng Hou & Xiwen Wang, Cellulose , 24 (11). Foam forming is a promising papermaking technology, which can reduce water and energy consumption while saving raw material. It can be used to produce low quantity thick special products such as non-woven fabrics and filter papers with high porosity and smooth surfaces. This study mainly introduced the effect of polyvinyl alcohol (PVA) foaming properties on foam forming, including foam generation rate, liquid drainage rate, properties of the suspension and foam stability. Charge reversal system with cationized cellulose nanocrystals to promote dewatering of a cellulosic fiber suspension, Allison C. Brockman & Martin A. Hubbe, Cellulose , 24 (11). A surface-modified form of cellulose nanocrystals (CNC) was employed to explore mechanisms related to the release of water from cellulosic fibre suspensions during papermaking. The CNC surface was rendered partly cationic (forming CCNC) by adsorption of poly-DADMAC, a high charge density cationic polymer. Meanwhile, a suspension of cellulosic fibres and calcium carbonate particles was prepared from recycled copy paper, which was treated sequentially with poly-DADMAC and a very- high-mass anionic acrylamide copolymer (aPAM). Results were consistent with a model of nanoparticle-enabled bridging, based on an assumption of non-equilibrium or slowly equilibrating processes of adsorption. Reusing tissue paper mill effluent water as corrugated paper mill intake water: Case study of a new clean production measure, Jinsong Tao et al , Environmental Progress & Sustainable Energy , online. To relief the water shortage crisis in China, the Chinese government has initiated a series of clean production (CP) measures to reduce the freshwater consumption and wastewater discharge from paper industry. In this study, a new CP technology was introduced in the paper industry to reuse tissue paper mill effluent water as intake water of corrugated paper mill. The feasibility and impact of the new CP technology was investigated in three different scales, laboratory experiments, pilot-scale testing, and long-term implementation. Results show that the water quality of treated tissue paper mill effluent water is competitive with that of freshwater and some water quality indexes are even better, indicating that treated tissue paper mill effluent water is a suitable alternative to replace the freshwater as intake water for the corrugated paper mill. High performance of hydrophilic polymers on the crosslinked polystyrene spheres for controlling contaminants in white water, He Xiao et al , Journal of Applied Polymer Science , 134 (31). The accumulation of dissolved and colloidal substances (DCS) and inorganic salts in the white water of papermaking circulation system will result in the abnormal runnability of paper machine and low quality of products. Contaminant adsorption on a solid adsorbent in a fluidized bed reactor has been applied for white water treatment.
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Technical Abstracts
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