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FIBRE PROCESSING WORLD PULPPAPER24 strength benefits of a CNF sheet help lower the on-going struggle some mills have with VOCs and various permit limits. FIBREFINE PAPER RESULTS SURFACE APPLICATION The use of the Hydra-Sizer Applicator in the FibreFine System gives the papermaker many options to create new grades or enhance current ones. By adding a CNF layer on the surface sheet characteristics can take on almost pre-coated value. We have seen Gurley Porosity values 30 times greater than the control. Sheffield Roughness values have been decreased by over 10 while STFI increased by 9.5. See figure 5 for a comparison between a regular sheet surface and one with CNF applied. One can see by this dramatic comparison how the new CNF covered sheet provides a drastic leap forward in grade creation. In addition to closing up a sheet making it smoother and stronger CNF addition can act as a pre-coat for several different types of coatings. The CNF surfaced sheet gives the papermaker a unique opportunity when it comes to applying various specialty or barrier coatings. The CNF sheet can help lessen the chemistry needed for certain barrier properties while making the sheets more environmentally friendly. Just a small reduction in some of the barrier coatings could translate into huge savings andor lower VOC levels. This concept is demonstrated with KN Ink Absorbency testing. As you can see adding CNF internally does influence absorbency however notice the difference when the CNF is applied to the sheet surface. Allowing your premium coating to remain on the surface where it is needed could provide many benefits for the papermaker and the converter. SUMMARY Although Cellulose NanoFibrils have been around for a long time the FibreFine System pushes the benefits toward the average papermaker. We can now employ refining machinery that every papermaker is comfortable with. Through our knowledge and equipment design energy costs continue to drop for CNF production. Should you wish to create a whole new grade line or just improve your economics CNF now affords the papermaker a new eco- friendly tool in their toolbox. The CNF surfaced sheet gives the papermaker a unique opportunity when it comes to applying various specialty or barrier coatings Figure 6. KN Ink Stain Test Figure 5