Advances in Recycling and Deinking by Pira International Ltd

By Pira International Ltd

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Many researchers have examined what might be considered fundamental problems in recycling: how fibres are affected by the recycling processes and how this influences paper properties. Recycling considerably reduces the papermaking potential of fibres. This loss of potential is mainly due to the loss of bonding capacity, which is certainly related to reduced fibre swelling. The surface properties of the fibre also appear to be important. General effects The practical effects of recycling on papermaking properties of fibres have been discussed thoroughly by several researchers and an excellent review was published by Howard (1990, 1995).

The high-quality DIP has physical and optical properties equal to and in some cases better than a hardwood pulp. Page 42 © Copyright Pira International Ltd 2006 Advances in Recycling and Deinking Designs for different grades 3 The twice-dried fibres in the dry-lap form of the DIP pulp drain faster than virgin hardwood pulp, meaning paper machine operators can increase the machine speed and/or lower the dryer temperature. The DIP requires the lowest level of refining energy to reach headbox freeness and corefining the DIP with hardwood or with hardwood and softwood combined does not significantly damage the fibres.

This important improvement is not obvious from the outside. Although there have been some improvements in washing technology, advances in flotation deinking have reduced the overall dependence on washing in general and boosted yields. In fact, some mills that still use side hill screens are mainly using them for fibre recovery. Yield is now very important to deinking and recycling plants, driven by the current high cost of recovered papers, and will be even more crucial in the future. Evolved flotation technologies along with today’s improved surfactants and other recycling chemicals have allowed greater ink removal, so plants need to do less washing.

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