Abstract
Although many degumming methods for fibrilia fiber have been established, the reaction priority of the gums and the influence of single gummy component removal/retention on the fiber property and the reaction behavior of the other components remain unclear. This study analyzed the above issues by the observing the change of fiber in microbial-mechanical ‘enzyme peeling’ and gas phase ozone treatment. Results showed that pectin removal could increase the fiber density significantly (∼60.3%) but would not cause damage to the fiber tenacity. The 2.5–4.5% pectin in untreated fiber could strongly restrict the removal of lignin and hemicellulose. Lignin had less influence on fiber density than pectin. The detailed composition of hemicellulose had a significant effect on fiber tenacity: the retention of xylan and mannan caused damage and benefit, respectively, to fiber tenacity. After the removal of 90.0% pectin and 23.0% hemicellulose, a deep delignification rate (>70.0%) could be obtained. The delignification rate of 70.0–80.0% was beneficial for the density decreasing and tenacity increasing of the fiber, while a delignification rate over 80.0% would cause the collapse of the cellulose structure and thus damage the fiber property.
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