Effect of spinning conditions on structures and properties of bamboo fibers with Lyocell process

Bamboo fibers were prepared using bamboo pulp as raw material by Lyocell process at different spinning conditions,their supermolecular structures and mechanical properties were examined by wide angle X-ray diffraction(WAXD) and polarizing optical microscopy(POM),and strength elongation tester.The results indicated that spinning conditions played an important role in determining the structure and properties of bamboo fibers with Lyocell process.The crystallinity and orientation of bamboo fibers increased as draw down ratio increased,leading to the increase of the tensile strength and initial modulus whereas the fineness and elongation at breaking decreased.Furthermore,with the increase of spinning speed at a constant draw down ratio,although the crystal orientation had no obvious change,the amorphous orientation and the crystallinity increased.As a result,the tensile strength and initial modulus increased while the elongation at breaking decreased.