The difference is that chemicals are sprayed onto the chips in the CTMP process to reduce the undesirable effects of the retained natural wood substances.
• The main disadvantage of this form of pulping is the high energy demand.
• Bleaching is an effective way to process the high quality papers which retain strength, do not discolor during storage or go yellow when exposed to light.
• It has the added advantages of improving absorption capacity and getting rid of small residues of bark or wood, as well as giving a high level of purity.