Imported Scutched Flax Landed against Domestic Chinese Fibre
Imported French scutched long line delivers higher hackling yield and lower yarn break rates, outperforming domestic Chinese flax on landed metre fabric cost.
Polypropylene Contamination
Plastic Impurity
Synthetic polymer strands introduced during the harvesting or baling of raw flax represent a persistent challenge for mechanical processing lines in spinning mills. Such polypropylene contamination involves the presence of non-organic fragments originating from sacks, bale wrappings, or twine that detach during handling. These foreign materials possess different melting points and friction coefficients compared to natural flax fibres, creating uneven tension during high-speed spinning.
The presence of these synthetic elements forces immediate cessation of line operations when detected within the carding or drafting zones of a facility. Spinning machinery relies on the uniform density of natural fibres to maintain thread integrity, and small amounts of these plastics interrupt the drafting process by causing roller slippage or structural weak points in the yarn.
Detection Protocol
Quality inspectors evaluate each batch upon arrival at the mill to verify the absence of synthetic materials before the raw material enters the primary blending phase. Personnel scan the fibre surface for high-gloss particles or coloured strands that deviate from the standard grey or tan hues of flax straw. Observations appear in the technical lot report as a binary pass or fail grade for the entire shipment.
Mills establish strict limits regarding synthetic content because these impurities resist the standard chemical scouring baths designed for organic waxes and pectins. Heat during the subsequent steam treatment causes plastic fragments to fuse onto steel cylinders, which ruins the surface finish of multiple spindles simultaneously. Engineers quantify the frequency of these incidents by mapping occurrences against the specific bale identification numbers recorded during the initial intake procedure.
Extraction Consequence
Downstream weaving machinery sustains damage when undetected plastic residue converts into brittle inclusions within finished fabric. Looms experience snapped warps as synthetic shards obstruct the tight spacing of heddle eyes or reed teeth during high-speed insertion. Financial losses mount quickly because these defects are difficult to remove after the fabric undergoes final dyeing or finishing steps.
Operators remove entire rolls from production when synthetic inclusions create voids or texture irregularities on the cloth surface. The integrity of high-grade linen output relies on the removal of these synthetic materials during the initial cleaning stages of fibre production.