Abstract
The preparation and properties of paper coating based bilayer of starch and shellac composites has been investigated in the present report. The bilayer coating were prepared by coating the surface of the paper using starch as first layer then shellac was coated on the surface of the starch layer. Composition of the bilayer composites of starch/shellac was 20:80, 30:70, 40:60, 50:50; 60:40; 70:30; 80:20; % w/w. The Payne Cup Analysis showed that the water vapour barrier properties of starch/shellac increased with the increased of shellac concentration, and very significant improvement was achieved when shellac concentration was above 50 wt%. The grease resistance of the sample was better than that of conventional paper coating. The Diffuse Reflectance UV showed that the transparency of the samples did not change by the presence of the bilayer composites. XRD indicatedd that the stability of shellac was improved by the presence of starch.
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