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Preparation of regenerated cellulose from rice straw lignocellulosic waste and its use for reinforced paper products, TAPPI Journal July 2021

ABSTRACT: Rice straw waste is a lignocellulosic waste produced by farmers in large quantities. In this study, regenerated cellulose (RC) from rice straw was prepared by dissolving rice straw holocellulose (HC) in NaOH/Urea/Thio-urea/Water solution by the freeze-thawing process. The crystallinity index of RC was calculated at 31%, which is out of the crystallinity range of 39%•69% that has been previously suggested.The study indicated that the RC is amorphous with a low degree of polymerization (638) and higher hydroxyl group content as compared to HC. The fiber length of RC was found to be 26.7% shorter; however, the width of RC was 21.2% higher as compared to HC. Reduced kinked fiber content was observed in the fraction of RC (18.3%) as compared with HC (39.1%), and a higher curl index of fiber was observed more so in HC (10.5%) than RC (5.6%). Because of the regeneration process, the fiber length was reduced and a fines element content of about 96% was observed in RC compared to the initial fines content of HC (56.9%). Irrespective of the high fines element content of RC, the composite paper of rice straw bleached pulp and RC fibers was developed with an increase in the tensile index from 41.4 N.m/g to 71.2 N.m/g and an increase in the burst index from 4.7 kPa.m2/g to 5.3 kPa.m2/g with the addition of 5% and 15% RC, respectively. However, enhanced tear index of paper was observed up to 5% and then it declined upon further addition of RC. The study revealed that regenerated cellulose can be used as a strength additive to overcome the shortcomings of low mechanical properties in paper products.

Journal articles
Open Access
Integrated Automatic Storage and Retrieval in a Fine Papers

Integrated Automatic Storage and Retrieval in a Fine Papers Finishing Department, 1991 Finishing and Converting Conference Proceedings

Journal articles
Open Access
The Power of Teams: Improving Quality in the Paper Industry

The Power of Teams: Improving Quality in the Paper Industry by Involving People, 1993 Finishing and Converting Conference Proceedings

Journal articles
Open Access
April and more, TAPPI JOURNAL, April 2004, Vol. 3(4) (492KB)

April and more, TAPPI JOURNAL, April 2004, Vol. 3(4) (492KB)

Journal articles
Open Access
Hydrodynamics of the Forming Section: The Origin of Nonunifo

Hydrodynamics of the Forming Section: The Origin of Nonuniform Fiber Orientation, 1994 Engineering Conference Proceedings

Journal articles
Open Access
Liquor-To-Liquor Differences in Combustion and Gasification

Liquor-To-Liquor Differences in Combustion and Gasification Processes: Nitrogen Oxide Formation Tendency, 1995 Engineering Conference Proceedings

Journal articles
Open Access
Slitting on the Corrugator with a Thin Blade Against a Slott

Slitting on the Corrugator with a Thin Blade Against a Slotted Anvil, 1990 Corrugated Containers Conference Proceedings

Journal articles
Open Access
Beneficial uses of pulp and paper power boiler ash residues,

Beneficial uses of pulp and paper power boiler ash residues, TAPPI JOURNAL, October 2006

Journal articles
Magazine articles
Open Access
Editor's Note: Great expectations, TAPPI JOURNAL January 201

Editor's Note: Great expectations, TAPPI JOURNAL January 2011

Journal articles
Open Access
88jan41

China Paper '87 bridges East and West, past and future, TAPPI JOURNAL January 1988

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