By Pira International Ltd
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Extra info for Advances in Recycling and Deinking
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. In addition to using the best flotation technology available, mills in the recent past had to use highly efficient washers to remove ink that remained in the pulp. Highly efficient washers remove most of the ink but take a lot of fibre with it. Improved flotation technologies allow mills to use less efficient washers and reap a big gain in yield.
The disadvantage of having the D step before the F step is dispersion or size reduction of the sticky material, which may reagglomerate later in the system. Most North American MOW systems are FDF or DFDF. Examples are the Union Camp facility in Franklin VA (Ferguson, 1995), and the Boise Cascade mill in Jackson AL (Ferguson and McBride, 1993). Compagnie Papeterie de l’Essonne in France (Platier, 1995) and Stora Magle-Molle Papirfabrik in Denmark (Nielsen, 1992) are examples of fine paper deinking systems in Europe.
Pulp treatment before the cleaners is therefore important, so as not to reduce particle size. 2%. Unfortunately, many particles have a similar density as water (1,000–1,100kg/m3) with only minimal centrifugal effect and corresponding low removal efficiency in a cleaner. Many stickies are just in this range and their removal remains an unsolved problem. Chemical agglomeration with heavier particles has been tried for stickies and may eventually bring some progress. Fine reverse cleaning True reverse cleaners have a tangential inlet and a central outlet for light rejects at the base of the cone, and an accepts outlet at the apex.
Advances in Recycling and Deinking by Pira International Ltd