DETERMINATION OF THE EFFECT ON THE COLOR HOMOGENEITY OF THE USE OF NATURAL DYE STUFF IN PAPER OBTAINED FROM RECYLED PAPER BY ACCELERATED WEATHERING

Abstract

In the event of reusing the waste paper, which was exposed various contaminants according to its place of use, the stain on it breaks the colour homogeneity. In this study, it was aimed to obtain the colour homogeneity of waste paper with the dyestuff obtained from the wild cranberry (Cornus australis L.). In the study, waste paper groups were formed as mixtures (MP) in the same proportions from offset printed magazine (OPM), newsprint (NP), copy paper (CP), unbleached paper (UP), corrugated cardboard (CB) and paper. In order to investigate the effect of dyestuff, the waste paper groups were produced under groups including the control paper without any additives ( I), paper mixed with dyestuff (II) and paper with dyestuff and alum (III). The same conditions were repeated with the imported bleached paper (BP) with the purpose of controlling the hiding power of the dyestuff. The paper produced was subjected to accelerated weathering test for 5-10-25-50 and 100 hours. Wave intensity of 0.65 W/m(2) was chosen as the test condition. At each weathering period, the changes in colour, gloss and opacity values of samples were investigated. According to the results obtained, the highest colour change value was obtained in the sample group I, and the lowest total colour change value was obtained in the sample group III. In Group II, the total colour change was the highest in imported bleached paper. The increase in weathering period did not affect the opacity. During the first 5 hours of weathering, the lowest opacity value was obtained in imported bleached paper. Through weathering method, the maximum decrease in opacity was observed in group II-BP.