Improved brightness for chlorine free paper
Advantages with pressurised hot peroxide bleaching:
Pressurised peroxide stages (PO) are an advantage in totally chlorine free (TCF) bleaching by making it possible to achieve a high final brightness. In sequences with chlorine dioxide (ECF bleaching), a powerful peroxide stage will reduce the consumption of chlorine dioxide or even replace one chlorine dioxide stage.
A hot, pressurised peroxide stage operates at temperatures above 100°C
(212°F) with a small amount of oxygen added. A prerequisite for successful peroxide bleaching is that the content of metal ions, e.g. manganese, copper and iron, is low.
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