Alkaline Liquor
Chemical preparation forms the core of continuous alkaline boiling inside Chinese linen mills during yarn preparation. Sodium hydroxide solution breaks down natural pectins and hemicellulose bound tightly to raw flax fibres. Reaction vessels maintain strict temperature limits to prevent degradation of cellulose chains necessary for subsequent spinning performance.
Mills record bath concentrations inside processing logs mandated by internal quality management protocols. Acceptance limits established by buyers differ from internal thresholds because industrial standards tolerate higher residual lignin than finished garment specifications require.
Fiber Penetration
High pressure steaming forces caustic liquor directly into dense flax bundles during continuous alkaline boiling operations. Entrapped air escapes through vacuum displacement before chemical agents flood reaction chambers. Reaction rates accelerate as liquor temperature rises toward the boiling threshold of water.
Mill supervisors adjust pump velocities when alkali consumption increases unexpectedly during heavy flax runs. Test certificates generated at this stage verify that raw material meets mechanical strength parameters before weavers accept yarn lots for production.
Cellulose Preservation
Tensile strength retention dictates the upper boundary of continuous alkaline boiling parameters. Excess alkalinity destroys internal polymer structures and renders spun linen yarn unviable for high speed looms. Laboratory technicians measure degree of polymerization levels against benchmark reference charts maintained by quality departments.
Fabric grades demand tighter viscosity tolerances than basic twine products because garment processing exposes structural flaws hidden inside grey cloth. Final tensile metrics establish the commercial valuation assigned to finished linen exports.
