Rieter

Evaluation of the blend

Index

The evenness of the blend must always be assessed in two directions: the longitudinal direction and the transverse direction. Where there is unevenness in the longitudinal direction, yarn portions exhibit different percentage distributions of the individual components (Fig. 32). These can lead to stripiness. Where there is unevenness in the transverse direction, the fibers are poorly distributed in the yarn section (Fig. 33). This irregularity leads to an uneven appearance of the finished product.

The determination of the evenness of a blend, e.g. of synthetic and natural fibers, is costly and not simple. One component is usually dissolved out or colored differently.

Fig. 32 – Unevenness of the blend in the longitudinal direction

Fig. 33 – Unevenness of the blend in the transverse direction