Dew-Retted Heilongjiang Flax against Imported Water-Retted Bales
Dew-retted Heilongjiang flax provides cost savings for medium counts, while imported water-retted bales deliver the fineness needed for yarn counts above Nm 50.
Yarn Count Ceiling
Maximum Linear Density
Flax fibre quality during the spinning stage determines the upper limit of output fineness that a mill maintains for a specific production run. The yarn count ceiling functions as a quantitative threshold assigned to a batch based on the structural uniformity of the raw material. Technicians establish this boundary after reviewing the average diameter and break strength of the scutched fibre, ensuring the machinery does not exceed the mechanical tolerance of the input.
Mills document this figure within the technical specification sheet to prevent breakage during high speed drafting.
Drafting Protocol
Operators translate the yarn count ceiling into a gear ratio setting on the spinning frame to control the extension of the roving. If the output exceeds this designated fineness, the likelihood of filament snap increases because the fibre length no longer supports the tension applied by the rollers. A set of sensors monitors the tension, halting the process whenever the variance pushes the count toward the prohibited limit.
This control mechanism protects the integrity of the total production volume from becoming unusable through excessive thinness.
Quality Verification
Compliance with the yarn count ceiling sits at the heart of the final inspection carried out before packing finished spools for export. Buyers compare the actual count against the initial ceiling stated in the purchase contract to confirm the material meets the requirements for intended textile applications. Flax mills calculate the deviation by weighing a standard length of yarn, which produces the actual count value that inspectors compare against the agreed ceiling.
Testing confirms the spinning machine maintained consistency throughout the entire output cycle. This specific numeric constraint acts as the final arbiter of grade classification for commercial linen.