Effect of Cationic Starch and Chitosan on Dry Strength of Bleached Soda Pulps Made of Pre-Extracted and Non-Extracted Bagasse

Document Type : Research Paper

Authors

1 Faculty of Natural Resources, University of Tehran,

2 Iranian Research Organization for Science and Technology

Abstract

This study focused on the properties of alkaline pulp obtained from the soda pulping of pre-extracted bagasse and the effects of dry strength polymers on mechanical properties of paper in comparison to a paper obtained from nonextracted bagasse. Hot-water pre-extraction was carried out at 135°C for 30 min. Consequently, soda pulping and ECF bleaching were performed on pre-extracted and un-extracted bagasse, under similar conditions. It was found that pre-extraction of about 50% of hemicelloluse of the bagasse decreased total pulping yield, kappa number and increased bleachability of pulps and resulted in a significant loss in tensile and burst strengths of hand-sheets. Then, reinforcing effect of the pulps with chitosan and cationic starch applied in the wet-end were investigated. The results obtained with suitable amounts of chitosan and cationic starch were encouraging, because comparable strengths were obtained from pre-extracted and un-extracted bleached soda bagasse pulps with 1% chitosan and 1.5% cationic starch. According to the results, drop in paper strength due to hemicellulose pre-extraction of the bagasse could be compensated using suitable dry strength polymer.
E
 
 
Effect of Cationic Starch and Chitosan on Dry
 
Strength of Bleached Soda Pulps Made of
 
Pre-Extracted and Non-Extracted Bagasse
 
Zeinab Khorasani
1, Yahya Hamzeh1*, Alireza Ashori2, and Mohammad Azadfallah
1
 
1. Faculty of Natural Resources, Department of Wood and Paper Sciences and Technology,
University of Tehran, P.O. Box: 31585-4314, Karaj, Iran
2. Department of Chemical Technologies, Iranian Research Organization for Science and Technology
(IROST), P.O. Box: 15815-3538, Tehran, Iran
Received 2 April 2012, accepted 17 December 2012

Keywords

Iranian Journal of Polymer Science and Technology
Volume 25, Issue 5 - Serial Number 5
January and February 2013
Pages 383-392

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