Sammanfattning

Spruce kraft pulp fibres were tested for mechanical properties in a newly constructed apparatus. Fibre samples were latewood fibres, either only partly-delignified latewood fibres with 6% lignin or H2O2/HAc-delignified fibres were used. In the present fibres, dislocations were easily detected in delignified fibers, but did not exist or were covered by lignin in the lignin-containing fibres. Single fibres were transferred to a frame and elongated in a tensile apparatus designed to measure force and elongation versus time of single fibres. Values were combined to load-displacement curves [1]. The fibre cell wall cross sections were measured in an ESEM (Environmental Scanning Electron Microscope) and used for stress-strain calculation. Preliminary results indicate that the partly-delignified and the delignified fibres show similar moduli of elasticity, but differ significantly in the ultimate tensile stress. The reason may be that delignification together with appearance of dislocations decrease tensile strength. However, ESEM micrographs of the fibre fracture surfaces indicate that the relation of these surfaces with dislocations is uncertain

Publicerad i

Utgivare: ESWM

Konferens

Second International Conference of the European Society for Wood Mechanics

SLU författare

• Ander, Paul

  • Institutionen för skogens produkter, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Skogsvetenskap


Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/839