engleski

Optical stability of papers exposed to electromagnetic radiation according to used flotation deinking method

This study observes optical stability of deinked Croatian daily newspaper with novel type of alkali media called Eco-alkali after exposing to electromagnetic radiation. Three deinking methods with Eco-alkali were carried out under different experimental conditions. Gained laboratory papers were submitted to accelerate ageing at 60°C for 24, 48 and 72h provided by Solarbox 1500e. Experimental results were compared to accelerate aged laboratory papers made of pulp deinked with frequently used INGEDE Method 11. The results have shown that the reflectance of samples is almost equalled to reflectance of non aged paper for wavelength higher than 600 nm and that consequential reduction of the reflective spectra for wavelength lower than 600 nm of accelerated aged papers treated with Xenon lamp and indoor filter was caused by blue part of visible light.

accelerated ageing, flotation deinking, recycled paper, reflectance

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