Molecular Bond
Chemical bonds formed between divalent ions and carboxylic acid groups in pectin provide the structural rigidity necessary for plant stability. In the context of flax processing, calcium cross links bind the individual fibers together into bundles that are difficult to separate without degradation.
Retting Effect
Natural variations in soil composition at the flax cultivation site influence the density of these connections. When calcium cross links are overly abundant, the resulting fiber is often brittle and stiff. This stiffness causes issues during the drawing process where the fibers must slide freely to achieve a fine count.
Mill technicians monitor the presence of these bonds to determine the appropriate intensity of the caustic boil-off.
Chemical Treatment
Wet spinning operations often utilize hot water or mild acidic solutions to weaken the influence of calcium cross links before the fiber reaches the drafting zone. This softening allows for the production of finer, smoother yarns. If the bonds remain intact, the yarn exhibits a rough surface and inconsistent diameter.
Effective removal of these links is a primary goal of the degumming stage in linen manufacturing, where the process ensures that the bundles are reduced to their constituent technical fibers to achieve the required yarn quality and surface smoothness.
