Hackling Yield Calculations for Imported Dew Retted Line Flax
Hackling yield calculations convert scutched line flax mass into spinnable sliver through precise moisture regain corrections and mechanical tow loss balancing.
Nep Potential
Fibre Propensity
Laboratory measurements of flax fibre determine the likelihood of small entanglements forming during the carding and spinning processes. Assessing the nep potential helps a mill predict the final surface quality of the linen yarn before the raw material is released to the production floor. Fibres with high moisture or immature cell walls are more susceptible to these defects.
These measurements typically use optical scanners to count the number of knots per gram of material. Testing occurs during the initial blending stage to allow for adjustments in the raw material mix.
Processing Risk
Mechanical stress during hackling and drafting can convert straight fibres into knotted clusters. Monitoring the nep potential allows engineers to adjust the pin density and speeds of the preparation machinery to minimize the formation of slubs. High levels of neps lead to an uneven appearance in the dyed fabric.
This measurement is a leading indicator of yarn grade.
Quality Control
Environmental conditions in the mill, particularly humidity, influence the physical expression of this trait. When the nep potential is high, increasing the relative humidity can soften the flax and reduce the static electricity that encourages tangling. Controlling the atmosphere is the standard response to poor fibre testing results.