Chitosan can be used as precoating,before extrusion coating,to give better adhesion and improve barrier properties.A chitosan from natural polysaccharide was studied as a potential additive in paper coating.Four chitosan solutions were made with concentrations of 0.1%,0.25%,0.5%,and 0.75% by weight of total dry coating weight.Bending strength was improved significantly,but tear index and tensile index were improved only slightly.Water absorption was slightly reduced.This preliminary study indicates that chitosan has good adhesion onto cellulose and could be used as an environmentally friendly coating material.Future studies will concentrate on the aroma and oxygen barrier properties of chitosan.
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