Chemical Degradation
Degradation of polysaccharide chains in flax fibre involves the loss of a proton from the alpha carbon position followed by the expulsion of an alkoxy group. Beta-elimination proceeds under alkaline conditions during the scouring process where high pH levels trigger the reaction. This chemical event breaks glycosidic bonds and shortens polymer length within the cellulose structure.
Reducing the average degree of polymerization decreases the physical tensile strength of the textile raw material.
Process Control
Scouring baths require precise temperature regulation to maintain stable alkalinity. Operators adjust the concentration of sodium hydroxide based on the initial pectin content detected in the raw flax samples. Excessive reaction rates lead to structural weakness in the final fibre bundles.
Correct parameter maintenance prevents the over-processing of cellulose before the spinning stage begins. Laboratory testing verifies the integrity of these fibres by measuring the viscosity of the solvent extract.
Quality Standard
Buyers specify strict viscosity limits within the technical procurement document to protect the mechanical performance of the resulting yarn. Maintaining specific molecular weight distributions ensures consistent weaving performance during high speed loom operations. Higher levels of chain scission correlate with increased yarn breakage during the drawing phase.
Fibre samples failing these viscosity thresholds undergo rejection because the chemical damage remains irreversible. Stable chemical processing maintains the structural value of the flax crop throughout the conversion from fibre to finished fabric.
