PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 2, Number 1, 2016
Properties and paper sizing application of waterborne polyurethanemicroemulsions: Effects of extender, cross-linker, and polyol, Ke Zhu et al , Journal of Applied Polymer Science , online. A series of waterborne polyurethane (WPU) microemulsions were synthesised through self-emulsification methodology. The resultant WPU microemulsions were utilised as surface-sizing agents for cellulose fibre paper. The influences of chemical composition on the physicochemical properties of the resultant emulsions and sized paper have been investigated in detail. Green coconut shell extract and boric acid: new formulation for making thermally stable cellulosic paper, Santanu Basak et al , Journal of Chemical Technology and Biotechnology , 91 (5). For the first time, green coconut shell extract (GCSE) has been employed along with boric acid (BA) as a novel fire retardant agent to be applied to cellulosic paper. Green coconut shell extract can be considered a condensed phase based flame retardant agent as it contains silicate, other metals like potassium, zinc, copper and magnesium in the form of metallic salts, oxides etc. When GCSE was applied on paper, combine synergistic action of all these metal salts and oxides catalyze dehydration of the treated paper and also increased char formation. Flocculation and viscoelastic behavior of industrial papermaking suspensions, Mustafa S. Nasser et al , Korean Journal of Chemical Engineering , 33 (2). The effects of the surface charge type and density C496, C492 and A130LMW polyacrylamides (PAMs) on the rheological behaviour of real industrial papermaking suspensions were quantitatively related to the degree of flocculation for the same industrial papermaking suspensions. Results revealed that increasing the cationic PAM surface charge decreases the floc size but increases the adsorption rate, elasticity and effective floc density proposing differences in the floc structures, which are not revealed clearly in the Bingham yield stress measurements. Improving strength properties of recycled and virgin pulp mixtures with dry strength agents, S.G. Gulsoy & S Erenturk, Starch , online. In the paper industry, the increasing use of recycled fibres as a substitute for virgin fibres has resulted in decreased strength properties. In this study, old corrugated container fibres were added in different ratios to virgin kraft fibres, and the effects on paper properties were investigated. Furthermore, 0.75% cationic starch and 0.75% Luredur® (a cationic polymer-based vinyl amine and N- vinylformamide) with respect to oven-dry fibres were added separately to old corrugated container fibre-containing/fibre-free suspensions, and the effects on handsheet strength properties were determined. STARCH Quality controlling of brown rice by ultrasound treatment and its effect on isolated starch, Dong-June Park & Jung-Ah Han, Carbohydrate Polymers , 137. Ultrasonic treatment (UT) was applied to brown rice at two different conditions: mild (25°C, 30min) and harsh (50°C, 60min) after soaking for several times (2, 3, 5, and 8h). After UT, starch was isolated from the brown rice grains, and the physicochemical properties of the starch, as well as the textural and nutritional properties of the grains, were compared. Processing surface sizing starch using oxidation, enzymatic hydrolysis and ultrasonic treatment methods — Preparation and application, Tobias Brenner et al , Carbohydrate Polymers , 138. The surface application of starch is a well-established method for increasing paper strength. In surface sizing, a solution of degraded starch is
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Technical Abstracts
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