The plant cell is surrounded by the cell wall, which is a relatively
rigid structure composed mainly of saccharide and phenolic polymers.
After plant maturation and harvesting, all that remains of the
elementary fiber is the cell wall. Flax fibers are classified as stem
fibers. They are cellulose-rich bast fibers that contain little lignin
and can be found in the outer non-woody stem tissues. It should
be noted that lignin, which is relatively low in quantity, has an
extremely important impact on both the mechanical and chemical
properties of plant fibers, and therefore represents a major target
for engineering