Rieter

Elongation at break (%)

Index

In contrast to yarn tenacity, rotor-spun yarn is more or less significantly superior to  ring-spun yarn in terms of elongation at break (%). On the basis of Uster Statistics it is apparent that the elongation at break of rotor-spun yarns is higher than that of comparable ring-spun yarns, albeit only marginally in some cases. This is especially positively noticeable in the working capacity of rotor-spun yarn, in that the differences relative to ring-spun yarn are smaller than for count-related yarn tenacity. Studies by prominent weaving machinery manufacturers demonstrate that 1% elongation at break produces the same improvement in working capacity as 2 cN/tex higher tenacity. At the high accelerations and loads to which yarns are exposed on modern high-performance machines, the elongation behavior of a yarn plays at least an equal, if not even a greater role than yarn tenacity. The advantages in processing are dealt with in greater detail in section  Processing properties.

The stress-strain behavior of the rotor-spun yarn is largely identical to that of a ring-spun yarn.

Table 20 – Properties of rotor-spun yarn compared to ring-spun yarn; 1) Positive or negative, depending on the end product; 2) Virtually the same as ring-spun yarn in the end product after finishing (see Table 19)