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M.L. Miller. The preparation of lumen-loaded pulp – prepared discussion contribution. In Papermaking Raw Materials, Trans. of the VIIIth Fund. Res. Symp. Oxford, 1985, (V. Punton, ed.), pp 1080–1083, FRC, Manchester, 2018.


We have been preparing lumen loaded fibres at Miami University, (1), by loading a Southern pine kraft pulp separately with titanium dioxide and clay..

Our preparation procedure is shown in Figure 1. To maximise the quantity of PEI retention aid in the lumen, we operate at high pH initially and then reduce it after stirring to canonize the PEI.


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