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Microscopic images of the used fiber types. (a) bleached softwood Kraft pulp (BSKP) fibers, (b) chemi-thermomechanical pulp (CTMP) fibers, (c) viscose fibers and examples of samples produced with these fibers, (d) BSKP (top sheet) and CTMP (bottom sheet) samples, (e) tomographic image of a typical wood fiber network, and (f) a cylindrical viscose fiber sample with a cellulose nanofiber (CNF) binder in mechanical testing.
