Resin Extraction
Chemical residue determination provides the proportion of natural waxes, pectins, and lignin remaining on hackled flax strands before spinning commences. Non-cessulosic impurity ratio calculates the mass fraction of these non-fibrous binding substances against total dry fiber weight inside laboratory testing reports issued by provincial processing bureaus in Shandong. Pectin bodies and cuticular fats inhibit wet drafting frames during high-speed yarn production unless eliminated through boiling alkaline treatments.
Raw flax stems possess higher amounts of natural gums than retted line fibers delivered to Chinese spinning mills. Processing technicians apply extraction protocols using organic solvents to dissolve surface binders without damaging underlying cellulose polymers.
Boiling Loss
Alkaline scouring removes residual plant resins during wet preparation stages before slivers reach drawing frames. Non-cellulosic impurity ratio measures the mass reduction percentage sustained by flax rovings during pressurized boiling procedures. High pectin concentrations demand extended caustic soda exposure inside commercial pressure kiers to prevent uneven dye uptake later in woven piece goods.
Laboratory certificates record scouring yield variances between different harvesting regions across northern provinces.
Export Grade
Finished yarn quality depends on thorough removal of natural binding compounds prior to winding and sizing operations. Non-cellulosic impurity ratio determines final commercial classification for flax yarn exports moving through coastal ports. Foreign buyers establish strict threshold limits for residual plant gums within contractual technical specifications.
Exceeding agreed contamination limits results in immediate batch rejection by receiving textile converters.
