Investigation on the Fiber Biometry and Chemical Compounds of Bast and without Bast Stalk of Cotton Stalk Sahel Variety

Document Type : Research Paper

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Abstract

In order to determine the fiber dimensions, physical and chemical properties of the bast and without bast stalk of Sahel-Variety of cotton stalk, required samples were prepared and studied. The results showed that fiber and lumen diameter and  cell wall thickness of  without bast stalk fibers were greater than those of bast fibers, while bast fibers were longer. Thus, this fibers can be classified as short and medium length fibers respectively.Data showed that the Length/ Diameter ratio and Runkle ratio of the bast fibers were greater than those of without bast stalk fibers, and flexibility coefficient in without bast stalk fibers was greater. Stalk with higher diameter had less bast proportion.Oven-dried density and swelling and shrinkage values of thicker stalks were greater than those of thinner ones, but apparent and basic densities,as well as porosity in thinner stalks were higher. Chemical Properties of bast and without bast stalk were respectively as follow: cellulose 39.27% and 48.3%,lignin 23.93% and 21.89% ,extractives 6.06% and 3.23% , ash content 6.36% and 1.85% ,one percent sodium hydroxide solubility 48.35% and 21.275% and hot water solubility19.48% and 9.68%.These indicate that without bast stalk fibers are more suitable than bast fibers for pulp production, but bast fibers are preferred in terms of fiber length.

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References

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Iranian Journal of Wood and Paper Industries
Volume 2, Issue 1 - Serial Number 1
January 2012
Pages 91-101

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