The long fibres that are broken loose from the flax straw during scutching are refined and prepared for spinning in the heckling phase.
This process is especially important for spinning. The scutched flax is guided through combs on the heckling machine, separating and mechanically refining the fibre bundle. If irregularities occur in the sliver, they cannot be removed later during spinning.
The heckled flax is composed not of individual fibres but of fibre bundles, the individual fibres of which are held together with plant-based glue.