Fiber Water Interactions in Refining, 2021 TAPPICon Live (21TAPL) 

The importance of refining cellulose fibers in order to impart characteristics which greatly influence their papermaking properties has been recognized from the earliest days of papermaking. The mechanism of ‘bar to bar’ mechanical refining in laboratory and commercial refiners has been well documented. Figure 1A illustrates the Primary Effects of Refining, and Figure 1B illustrates the formation of fines. 

This polarized light, visually based, study focused on the step by step effects of the refining action on individual fibers; and the changes in fiber morphology, including forming of cell wall dislocations; removal of the outer primary and S1 walls; increased fiber flexibility; creation of the hemicellulose- water fiber surface ‘gel’; delamination of the fiber structure; unraveling of the cell wall fibrils; creation of fines;  and a comparison in the effects of refining on high and low coarseness fibers. 

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