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Viewing report
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Effect of Mechanical Treatment on Softwood Kraft
Fiber Properties. Edition No. 1
VDM Publishing House, Oct 2008, Pages: 64
In the pulp mill the pulp is mixed, pumped and shear
forces are applied to the fiber at different
temperatures and under different chemical
conditions.
Mechanical treatment at the end of cooking and
homogenisation at room temperature of kraft pulp
fibers increased the number of fiber deformations.
The increase in fiber deformations did not reduce
single fiber strength but did affect the strength
properties of the fiber network.
The fiber damage induced by mechanical treatment
also decreased the z-directional strength of the
fiber network, which was concluded to be due to
separation of the structural elements on the fiber
surface layer. The separation of structural elements
could enhance the irregularities on the fiber
surface layer and so reduce the bonding area.
The zero-span tensile strength of fibers was not
dependent on the degree of fiber deformation, but
according to the hypothesis presented above, on the
3-dimensional arrangement of the structural elements
in the fiber wall. This 3-dimensional arrangement of
the structural elements in the fiber wall defines
the axial load bearing ability of the softwood kraft
fiber.
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