Cellulose (2019) 26:1995–2012
2007
Fig. 10 Stress–strain curves the tested fibers: a unrefined BSKP, b HC refined BSKP, c HC ? LC refined BSKP, d viscose
Fig. 11 Stress–strain curves of the tested BSKP hand sheets with restrained ( a ) and unrestrained drying ( b ). PFI 2000 rev. curves of the same BSKP from courtesy of Khakalo (additional information can be found from Khakalo et al. 2017a)
presented in the literature have typically been appar- ently linear or slightly concave downward (Kallmes and Perez 1965a, b; Van den Akker et al. 1965; Hardacker and Brezinski 1973; Groom et al. 2002, Mott et al. 2002), whereas the concave upward shape has been especially rare. In summary, unexpectedly
only a few of the individual BSKP fiber tensile curves were apparently linear and elongation range from 3 to 6% was absent, which is the typical elongation in the classical literature references reviewed. Unexpect- edly, in this work, none of the individual BSKP fiber
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