Rieter

Downstream processing and end products

Index

Air-jet spun yarns display good performance in downstream processing, both in knitting and weaving. Their performance is in general at least as good as that of ring-spun yarns. The somewhat lower yarn strength is more than offset in downstream processing by positive yarn features:

  • low hairiness,
  • good abrasion resistance,
  • fewer yarn defects.

As regards hairiness, the considerably reduced number of longer hairs in particular is favorable for processing air-jet yarns, especially in the warp.

The good abrasion resistance of air-jet spun yarns has already been mentioned. This is clearly confirmed by the results in Fig. 47. This leads to considerably reduced dust and fly generation in weaving and knitting.

Air-jet spun yarns generally have fewer major yarn defects, which is of course positive with regard to yarn processing.

The quality of fabrics out of air-jet spun yarn is surprisingly good. An overview of these quality aspects is displayed in Fig. 48. This summary is discussed in the following in more detail, in comparison with ring-spun yarn fabrics. Tensile strength is obviously slightly lower.

Fig. 47 – Lint shedding (Murata)

Fig. 48 – Quality of air-jet fabrics compared to ring standard fabric

Pilling resistance is really excellent (Fig. 49), this being at least partly due to the fully covered core fibers.

Air-jet fabrics have a very good appearance. According to tests performed at Cotton Incorporated, air-jet fabrics have very good overall surface definition and slightly more brightness.

The hand of air-jet fabrics, in terms of softness, is situated between the hand of ring-spun and rotor-spun fabrics.

Due to the good overall properties of air-jet products, air-jet yarns can be used for most applications within the yarn count range in which air-jet spinning is operating at present (Ne 15 to 60). The main products are summarized in Fig. 50.

Fig. 49 – Pilling resistance after 15 min (Murata)

Fig. 50 – Air-jet products