Home » Volume 27, 2012 » Issue No. 5
Influence of Jack pine earlywood and latewood fibers on paper properties
Fang Huang, Robert Lanouette and Kwei-Nam Law
The morphological differences of EW and LW fibers influence the papermaking characteristics of the resulting pulps, namely the physical and optical properties. For a given freeness, thanks to their better fiber conformability, the fibers of EW whole pulps produce handsheets with higher sheet density, lower roughness and porosity than those of LW pulps. Mainly due to highly fibrillated fibers and fibril-rich elements in the fines, the fibers of LW whole pulps yield handsheets with better physical strengths, such as tensile, burst, and tear indices when compared to the EW counterparts. On the other hand, the EW pulps show higher light absorption coefficient because they have higher lignin content when compared to the LW pulps. However, EW pulps have better light scattering coefficient than LW pulps because the fines in EW pulps contain more flake-like particles which increase the scattering of light in the sheet structure. In the fiber network, the thin-walled EW fibers have better collapsibility and conformability, thick-walled LW fibers produce sheet with higher bulk and have greater fiber twists and fibrils in the network.
Earlywood, Jack pine, Latewood, Paper properties
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Influence of Jack pine earlywood and latewood fibers on paper properties (2012-27-05-p923-929-Huang.pdf)