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Changes of paper properties of nonwood pulp on recycling.

Application: Researched results of recycling potential of different furnish may be used by recycled paper mills.

The importance of recycling is increasing for the pulp and paper industry because of decreasing forest resources, landfill problems, environmental regulations, and associated legislation. One of the main drawbacks of recycled fiber is the loss of mechanical strength of paper made from recycled fibers. The origin of the strength loss has been a source of debate. The recycling potential depends on many factors: fiber furnish, pulp chemical compositions, pulp beating, sheet drying, etc. The effects of recycling on nonwood pulp fibers are not well documented yet. Therefore, this study investigates the effect of recycling on jute and cotton stalk pulps, which are potential raw materials in Bangladesh.

For this study, we recycled bleached and unbleached pulps (both beaten and unbeaten) from jute and cotton stalks in water medium five times and measured changes in strength properties and fiber dimensions.

Each recycling decreased the breaking length and burst index of jute pulp. Beaten pulp showed less recycling potential than that of unbeaten pulp. The breaking length and burst index of unbleached cotton stalk pulps decreased linearly over the entire range of recycling. The tear index of jute pulp increased up to the second recycling, then decreased, but we saw no significant change for cotton stalk pulps. The double fold number of both cotton stalk and jute pulps decreased tremendously on recycling. The average fiber length of beaten and unbeaten jute pulp increased on recycling. On recycling, fiber length of unbeaten cotton stalk pulp did not show any change, but increased in the case of beaten pulp.

Jahan is scientific officer with the Pulp and Paper Research Division, BCSIR Laboratories, Dhaka, Dr. Qudrat-E-Khuda Road, Dhaka-1205, Bangladesh. Email Jahan at
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Title Annotation:Recycling
Author:Jahan, M. Sarwar
Publication:Solutions - for People, Processes and Paper
Date:Jul 1, 2003
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