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Introduction Carboxymethylation (CM) is one of the most promising approaches for increasing the strength of paper. This is especially true when the fiber components of paper are deficient in bonding ability, as in the case of recycled kraft fibers (Duker and Lindström 2008; Duker et al. 2008). Substantial increases in the dry strength of paper were observed in paper that was prepared by CM of the surfaces of bleached softwood kraft pulp (Ruffini 1966; Lindström and Carlsson 1982; Torgnysdotter and Wågberg 2004). Depending on the ionic conditions during drying

Holzforschung, Vol. 62, pp. 8–14, 2008 • Copyright by Walter de Gruyter • Berlin • New York. DOI 10.1515/HF.2008.002 Article in press - uncorrected proof Paper dry strength improvement by xyloglucan addition: Wet-end application, spray coating and synergism with borate Lage Ahrenstedt1, Antti Oksanen2, Kristian Salminen2 and Harry Brumer1,* 1 School of Biotechnology, Royal Institute of Technology (KTH), AlbaNova University Centre, Stockholm, Sweden 2 VTT Technical Research Centre of Finland, P.O. Box 1603, 40101 Jyväskylä, Finland *Corresponding author. School

FT-IR spectroscopy in the evaluation of dry handsheets with an acrylamide-based dry-strength resin Daisuke Tatsumi, Tatsuo Yarnauchi* and Koji Murakami, Department of Wood Science and Technology, Faculty of Agriculture, Kyoto University, Kyoto, Japan Keywords: Analysis, Reflectance, Dry strength agents, Infrared spectra, Acrylamide, Retention, Fourier analysis, Polyacrylics. SUMMARY: The paper sheets containing polyacrylamide (PAM) dry-strength additives were analyzed by Fourier transform infrared (FT-IR) spectroscopy. Attenuated total reflection (ATR

169 S==lå=íÜÉ=jÉÅÜ~åáëãë=ÄÉÜáåÇ=íÜÉ=^Åíáçå=çÑ=aêó=píêÉåÖíÜ ====~åÇ=aêó=píêÉåÖíÜ=^ÖÉåíë Lars Wågberg Department of Fibre and Polymer Technology, KTH, Stockholm 6.1 Background 169 6.2 Paper Strength as an Adhesion Problem 170 6.3 Influence of Dry Strength Additives on Paper Strength – The More Traditional View 172 6.3.1 Tensile Properties 172 6.3.2 Compression Properties 178 6.4 References 182 SKN==_~ÅâÖêçìåÇ The increasing use of recycled fibres and other inexpensive furnish components, such as fillers, has led to a decrease in the strength

382 Nordic Pulp and Paper Research Journal Vol 23 no. 4/2008 KEYWORD: Application method, Dry strength agents, Handsheet properties, Polyacrylamide, Tensile strength SUMMARY: Fundamental mechanical and optical properties of papers were considered to comprehensively study the mecha- nism of strength development by addition of polyacrylamide dry strength resin (PAM) in relation to the application method. Handsheets made from lightly beaten hardwood kraft pulp with various amount of PAM were prepared by both the internal and external application methods. The

Polyelectrolyte multilayering of fibers with different polymer combinations and a comparison of its effect on paper strength with a conventional dry strength agent treatment Seong Min Chin, Hye Jung Youn, Jaeho Ryu, and Kyujeong Sim KEYWORDS: Polyelectrolyte multilayering, Pulp fiber, Adsorbed amount of polymer, Paper strength, Dry strength agent SUMMARY: Pulp fibers were modified by poly- electrolyte multilayering with different polyelectrolyte combinations and its effects on the mechanical properties of sheets were investigated in a comparison with a

/kg), which is a significant improvement. PEG also increased the tensile index of heat-treated sheets with 5 % PLAf slightly when added in amounts of 1 % or 10 %. Figure 13 Tensile index of paper sheets made with 0 % and 5 % ultrasonicated PLAf and chemical additives. It was surprising that C-PAM had such a small, or sometimes even negative, effect on strength, because it is often used to increase dry-strength (Stenius 2007 ). If one compares the molecular weights (MW) and the charge densities of the cationic chemical additives, it seems that a lower MW and a higher charge

Nordic Pulp and Paper Research Journal Vol 23 no. 1/2008 65 KEYWORDS: Surface carboxymethylation, CMC, Drying, Hornification, Paper strength properties, WRV SUMMARY: This paper deals with the ability to use high molecular weight CMC as a dry strength agent in paper and how the drying of the pulp, either before or after the CMC attachment, affects the mechanical properties of the paper. The effect of the counter-ion form used during drying and reslus- hing was also investigated. In the case of the calcium and hydrogen counter-ion forms, drying after CMC

PAPER PHYSICS Nordic Pulp & Paper Research Journal Vol 29 no (3) 2014 434 Improving the extensibility, wet web and dry strength of paper by addition of agar Alexey Vishtal and Elias Retulainen KEYWORDS: Extensibility, Spraying, Agar, Papermaking, Shrinkage, Film, 3D-forming SUMMARY: High extensibility of paper is of great importance for many finishing and converting operations. Extensibility is a key feature for the paper and paperboard which are utilized in production of advanced 3D-shapes. However, extensibility of the conventional paper and

PAPER PHYSICS Nordic Pulp & Paper Research Journal Vol 31 no (3) 2016 459 On the nature of joint strength of paper − Effect of dry strength agents – Revisiting the Page equation Tom Lindström, Christer Fellers, Mikael Ankerfors, and Gunborg Glad Nordmark KEYWORDS: Fibre-fibre bonding, Joint strength, Cationic starch, Carboxymethyl cellulose, Ionic groups, Microfibrillar cellulose, Nanofibrils, Nanofibrillar cellulose, Page equation, Interlaminar shear strength, Z-strength, BET surface area. SUMMARY: This report deals with the effects of various