Fiber Specification
Measuring gravimetric linear density provides a dependable numerical baseline for raw flax lots entering the spinning preparation room. ISO 2370 Fineness establishes the air permeability resistance of a compressed fiber plug under controlled conditions, translating airflow backpressure into standard tex units for technicians. Zhejiang processing plants apply this protocol to dry hackled line flax before roving frames draw the material into intermediate yarn packages.
Mill superintendents record the resulting mass per unit length figures inside quality logs to separate fine spinning grades from coarser tow outputs.
Drafting Control
Mechanical processing efficiency depends upon maintaining uniform fiber dimensions throughout preparatory drawing operations. Spinning technicians utilize gravimetric density parameters to adjust roller weighting and drafting spacing on wet and dry processing machinery. Inconsistent linear mass causes uneven drafting tension, leading directly to thread breakage and structural defects in the final woven cloth.
Strict adherence to specified air flow resistance values prevents roving irregularity from propagating downstream into warp and weft yarns.
Export Verification
Commercial agreements between eastern spinning mills and international linen distributors rely upon verifiable laboratory test certificates for parcel acceptance. Export documentation references standard test method compliance to confirm that raw material characteristics match purchase contract specifications before bales leave the warehouse. Fabric manufacturers inspect these mill reports to verify that finished cambric and sheeting materials will perform predictably during subsequent piece dyeing and finishing stages.
Final settlement invoices adjust pricing penalties upward or downward based upon whether certified air permeability measurements fall within agreed tolerance thresholds.
