Surface application of cellulose microfibrils on paper – Effects of basis weight and surface coverage levels, 19PaperCon
Films of cellulose nanofibrils (CNF) or papers coated with CNF have been shown to have excellent oxygen barrier properties and grease resistance. However, the continuous production of CNF films or the coating of CNF on paper is difficult due to the high amount of water that needs to be dried, since CNF is typically produced and applied at about 3% consistency or less. CNF can also be added to the surface of the sheet at the wet end of the paper machine with a slot coater, curtain coater, or secondary headbox, to take advantage of the mechanical dewatering before drying. The properties of paper with surface applied CNF are not yet well described in the literature.
In this study, various amounts of CNF were applied on the wet end of a pilot paper machine using a curtain coater, at three different basis weights of paper. A number of properties were measured, including Gurley porosity, bulk, internal bond, tensile, and absorption rates. Most properties were impacted at levels as low as 2 g/m2 (gsm) but at 4 gsm, the sheet becomes quite closed or less porous. The permeability decreased by two orders of magnitude.
A water borne barrier coating was applied on the CNF layer. The barrier coating was much more effective on the CNF layer than without this layer. This surface closure could lead to novel products or improved properties of current grades.
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Surface application of cellulose microfibrils on paper – Effects of basis weight and surface coverag
