Correlating Monomer Ratio Variances in Flax Middle Lamella Lignin to Drafting Force Instability
Low S/G monomer ratios in flax middle lamella increase lignin cross-linking, elevating wet drafting force variability and driving yarn count instability.
Ether Linkages
Chemical Modification
Chemical bonds formed between cellulose hydroxyl groups and cross-linking agents establish permanent structural modifications in high-grade linen fabrics. These ether linkages are introduced during the liquid ammonia or resin finishing stages to improve the crease-recovery performance of the woven fabric. By replacing weak hydrogen bonds with stable covalent ether bonds, the treatment prevents the cellulose chains from sliding when the fabric is folded or washed.
Finishing Mechanism
The generation of these bonds requires the application of a polyfunctional cross-linking reactant, followed by drying and high-temperature curing in the finishing stenter. During this process, the agent reacts with the secondary hydroxyls on adjacent cellulose chains, locking them into a rigid network. This molecular rearrangement reduces the moisture regain of the flax fiber slightly but increases its wet crease recovery angle.
Mills test the efficiency of the reaction by measuring the wet and dry crease recovery angles, recording the results on the fabric quality certificate before export.
Structural Degradation
Excessive etherification can severely reduce the tearing strength of the linen fabric by making the crystalline regions of the flax fibers brittle. Buyer specifications usually limit the acceptable loss in tensile strength to twenty percent of the untreated fabric value, meaning finishing plants must balance the crease-resistant properties with fiber integrity.