engleski

The reflectance spectrum of recycled papers exposed to accelerate ageing according to used flotation deinking method

This study observes optical stability of newspaper laboratory handsheets after exposing to accelerated ageing. By chemical deinking flotation method under different experimental conditions, Croatian daily newspaper was recycled. Accelerated ageing of prepared handsheets were done in an oven at 60°C, while exposure time was varied. Optical stability of all handsheets were analysed through changes in reflectance spectrum and compared to those made with frequently used deinking method INGEDE 11. Regardless the process conditions during the flotation deinking, it is a notable increase of the reflection values in the visible part of the spectrum after handsheets ageing. The highest increase of reflectance values is obtained on handsheet which was prepared from newspaper suspension disintegrated at room temperature during recycling process.

accelerated ageing; process conditions of flotation deinking; recycled paper; reflectance value

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