Paper strength improvement by oxidative modification of sisal cellulose fibers with laccase–TEMPO system: Influence of the process variables

2012 ◽  
Vol 88 (3) ◽  
pp. 830-837 ◽  
Author(s):  
Elisabetta Aracri ◽  
Cristina Valls ◽  
Teresa Vidal
Keyword(s):  
Cellulose Fibers ◽  
Oxidative Modification ◽  
Paper Strength ◽  
Process Variables ◽  
Strength Improvement

Application of DSA to improve strength of thermomechanical pulp blended paper

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Cheol Woo Lee ◽  
Jeong Yong Ryu
Keyword(s):  
Kraft Pulp ◽  
High Strength ◽  
Thermomechanical Pulp ◽  
Paper Strength ◽  
Bleached Kraft Pulp ◽  
Degree Of Refining ◽  
Strength Improvement

Abstract A more efficient application of a dry strength agent (DSA) was investigated to improve the strength of thermomechanical pulp (TMP) blended paper. Strength improvement by DSA application was more effective for hardwood bleached kraft pulp (Hw-BKP) than TMP. The degree of strength improvement of DSA further increased with the increasing degree of refining of Hw-BKP. The strength of the paper was decreased by the fines fractionation of TMP, but the strength improvement efficiency of DSA for the fines fractionated TMP increased. In order to increase the strength of TMP mixed paper using DSA, it is expected that DSA should be adsorbed only to Hw-BKP with high strength improvement efficiency, not TMP fines. When the DSA was mixed with Hw-BKP before contact with other stocks, it was confirmed that the effect of improving the strength by the DSA is the best. The strength improving effect increased as TMP fines were removed. Therefore, to improve the strength of the paper containing TMP in Hw-BKP by adding a DSA, it is preferable to selective apply the DSA to Hw-BKP while blending only the fibers of TMP by fractionation.

scholarly journals Paper Strength Improvement by Anionic PAM and Cationic Starch Adsorbed PCC

2013 ◽  
Vol 45 (1) ◽  
pp. 59-66 ◽  
Author(s):  
Do-Chim Choi ◽  
Eun-Yeon Choi ◽  
Jong Myoung Won ◽  
Byoung-Uk Cho
Keyword(s):  
Paper Strength ◽  
Cationic Starch ◽  
Strength Improvement

Characterization of pulp refiners by a C-factor

1990 ◽  
Vol 5 (1) ◽  
pp. 3-8 ◽  
Author(s):  
Richard J. Kerekes
Keyword(s):  
Fiber Length ◽  
Cellulose Fibers ◽  
Refining Process ◽  
Process Variables

Keywords Disk refiners, Conical refiners, Cellulose fibers, Refining, Process variables, Energy, Fineness, Fiber length, Grooves, Bars, Impact, Equations

Paper dry strength improvement by xyloglucan addition: Wet-end application, spray coating and synergism with borate

Holzforschung ◽  
2008 ◽  
Vol 62 (1) ◽  
pp. 8-14 ◽  
Author(s):  
Lage Ahrenstedt ◽  
Antti Oksanen ◽  
Kristian Salminen ◽  
Harry Brumer
Keyword(s):  
Kraft Pulp ◽  
Spray Coating ◽  
Fibre Surface ◽  
Thermomechanical Pulp ◽  
Paper Strength ◽  
Paper Properties ◽  
Chemical Pulps ◽  
Spray Solution ◽  
Cross Links ◽  
Strength Improvement

Abstract The polysaccharide xyloglucan as a wet-end additive improves paper properties. In the present study, paper strength improvement was analysed for dry handsheets made from chemical, mechanical and recycled pulps coated with xyloglucan in a spray application. Results are compared with sheets made from the same pulps treated with xyloglucan in the wet-end. Kraft pulp handsheets of bleached hardwood and softwood showed significant improvements of tensile, tear and Z-strength by xyloglucan spray treatment versus wet-end application, whereas handsheets of de-inked and thermomechanical pulp were improved only slightly. In both wet-end and spray applications, the effect of xyloglucan addition was intimately related to the presence of non-cellulosic components on the fibre surface. Further strength improvements were obtained for chemical pulps by addition of borax to the spray solution, which were likely to be due to the formation of borate-mediated xyloglucan cross-links. Spray coating of xyloglucan, with or without borax, thus represents a potential new application of this polysaccharide to increase paper dry strength.

scholarly journals Effect of Refining on Physical Properties and Paper Strength of Pinus massoniana and China Fir Cellulose Fibers

BioResources ◽  
2016 ◽  
Vol 11 (3) ◽  
Author(s):  
Tingjie Chen ◽  
Yongqun Xie ◽  
Qihua Wei ◽  
Xiaodong (Alice) Wang ◽  
Olle Hagman ◽  
...  
Keyword(s):  
Physical Properties ◽  
Cellulose Fibers ◽  
Pinus Massoniana ◽  
Paper Strength

Characterisation of fines from unbleached kraft pulps and their impact on sheet properties

Holzforschung ◽  
2008 ◽  
Vol 62 (5) ◽  
Author(s):  
Marie Bäckström ◽  
Marie-Claude Kolar ◽  
Myat Htun
Keyword(s):  
Mechanical Properties ◽  
Capillary Forces ◽  
Strength Properties ◽  
Kraft Pulps ◽  
Paper Strength ◽  
Essential Component ◽  
Profound Influence ◽  
The Creation ◽  
Strength Improvement

Abstract Fines are an essential component in the papermaking process because they have a profound influence on the behaviour of the wet web and on the mechanical properties of the final sheet. Primary fines are present in the pulp prior to refining, and secondary fines are produced during refining. In the present investigation, two commercially manufactured unbleached pulps with kappa numbers of 45 and 90 were studied in terms of how they responded to refining with respect to the quality of fibre and fines. Primary and secondary fines were collected and characterised and their impact on sheet strength was evaluated by addition of known amounts to a refined and decrilled pulp. All the measured paper strength properties improved when primary and secondary fines were added. The strength improvement was generally somewhat higher in the second case. The effect was more pronounced at a higher level of addition. We attribute the main strength improvements associated with fines to improved consolidation by the creation of capillary forces between the surfaces.

scholarly journals Application of Amphoteric Polyacrylamide Solely or with the Combination of Cationic Starch for Paper Strength Improvement

BioResources ◽  
2018 ◽  
Vol 13 (4) ◽  
Author(s):  
Peipei Wang ◽  
Yangyang Zhu ◽  
Xiaoyan Wang ◽  
Xinyu Zhang ◽  
Wenyuan Zhu ◽  
...  
Keyword(s):  
Paper Strength ◽  
Cationic Starch ◽  
Strength Improvement
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