Mass Addition
Starch solids adhere to warp yarns during mechanical sizing inside provincial Chinese weaving workshops. This sizing add on percentage measures dry coating weight gained against raw linen yarn mass before loom entry. Technicians calculate the metric on dried samples extracted directly from sizing machine creels prior to beam winding.
Starch paste viscosity and squeeze roll pressure determine final solids pickup levels across specific linen yarn counts. Higher coating weight protects delicate flax fibers from abrasive heddle friction during high speed shed formation. Supervisors record these exact pickup calculations within daily production ledgers maintained for each loom batch.
The metric stops applying once sized warp beams transfer to loom storage racks because sizing loss ceases after weaving operations begin.
Solution Viscosity
Potato starch slurries circulate through heated immersion troughs where sizing add on percentage stabilizes under automated temperature control. Operators adjust pump speeds whenever ambient humidity shifts inside spinning and weaving complexes. Dry air increases moisture evaporation rates from wet yarn sheets passing over stainless steel drying cylinders.
Heavy sizing pickup restricts lateral yarn flexibility and causes subsequent warp breaks on mechanical looms. Lighter starch application fails to bind protruding flax hairs effectively during high tension shedding cycles. Laboratory technicians measure residual pickup gravimetrically by stripping dried starch coatings from sample yarn lengths using enzymatic wash baths.
Mill managers cross reference these laboratory values against automated inline sensor readings to maintain production uniformity across daily shifts.
Acceptance Tolerance
Mill protocols establish strict limits for sizing add on percentage before foreign buyers inspect finished greige cloth shipments. Contractual thresholds typically permit minor deviations around target pickup values agreed during initial sample trials. Independent inspectors verify compliance by testing random core samples pulled from sealed shipping containers at export docks.
Excessive starch weight invalidates commercial delivery terms because extra mass distorts true textile density measurements. Buyers reject shipments failing these verification standards before ocean freight loading commences.
