Dimensional Proportion
Measurement of the quotient of fibre length to its mean diameter establishes the suitability of flax bundles for high-speed wet spinning. In linen yarn manufacturing, aspect ratio defines this geometry and influences how fibers behave under tensile stress. Higher values signify longer, finer fibers that slide smoothly during drafting.
Short fibers with low values lead to uneven draft and weak yarn.
Spinning Performance
Tensile strength and drafting behaviour in the spinning frame depend on the physical interaction of fiber bundles. A high aspect ratio increases the surface contact area between overlapping flax fibers, which allows friction to transfer tension along the strand. This interaction prevents premature yarn breakage and draft defects on the frame.
Mills monitor this parameter to adjust the settings on the drawing frames, optimizing the roll settings to match the fiber length distribution. When yarn is drawn through the wet spinning bath, the lubricating water reduces friction, making the fiber-to-fiber contact area even more influential for yarn cohesion.
Bending Rigidity
Structural stiffness of the individual fibre determines the hand and drape of the finished linen fabric. A lower aspect ratio in the individual fiber cross-section increases the force required to bend the yarn, resulting in a stiffer cloth. Adjusting the fiber selection before spinning allows the mill to control this stiffness.
Consequently, finer yarn configurations are reserved for lighter linen fabrics.
