RELATION BETWEEN TWIST AMPLITUDE & BREAKING STRENGTH OF SOLOSPUN YARNS

1. Submitted to: Mr. Md. SAHABUL ISLAM
Lecturer, BGMEA University of Fashion & Technology
Submitted by :
Dhrubo Adhikary [172-015-0-155]

3.  Different twist amplitudes in Solospun and ring spun
yarns are analyzed.
 The relation between breaking strength of the two
yarn types is studied using a set of structural models
of the yarns and the mathematical relation between
twist amplitude and breaking strength.
 Finally, experiments prove the theoretical results.

4. Solospun, a new kind of spinning technology, is a
method of producing a single yarn that can be
successfully woven as a warp yam. In addition,
Solospun yarn provides fabrics with greater flexibility and
strength as well lighter weight.

5. The strength of a Solospun yarn comes mainly from
the friction between its fibers, which is due to the
centripetal pressure of the twisted fibers when the
yarn is stretched. Because the helix angle of twisted
fibers can be expressed indirectly by the twist
amplitude, the breaking strength of the two yam
types can be analyzed by studying the state of twist
amplitude in the yarns.

7. The state of twist amplitude in Solospun yarns differs
from that in ring spun yarns owing to the particular
twisting mechanism of Solospun, where fiber
bundles coming from the drafting roller are divided
into several substrands that are weakly twisted
before they are combined and twisted together .
This results in the different breaking strengths of the
two yam types.

8. •In this work, certain amounts of Solospun and ring
spun yams are spun with the same roving and yarn
count and given the same twist.
• Moreover, the drafted strand is divided into three
substrands in the Solospun technology.
•The twist amplitudes in the two kinds of yams are
shown in Figures 2 and 3 [1], where r0 is the
radius of the ring spun yarns, R is the radius of the
Solospun yarns, and r is the radius of the
substrands in the Solospun yams.
•Assuming that the cross-sectional areas of the
yarns are equal, the relation between r0 and r is
πr0²= 3 πr²………….. [1]

11. Finally Result is
Twist Amplitude and Breaking Strength of
Yarns
so the centripetal pressure of each fiber in Solospun yams is larger than that of
the corresponding fibers in ring spun yams.’That is, the friction force between
fibers in Solospun yams is larger than that in ring spun yarns.
Therefore, at the angle of centripetal pressure, the breaking strength of
Solospun yams should be higher than that of ring spun yams as long as the
twist given to those yams is limited to a certain degree, below which the
breaking strength of the yams won’t decrease because the tilting angle of the
fibers is too large.

12. Ring spun and Solospun yams were spun with
Solospun roller 2 on a trial Filatoio machine to verify
our theory. The actual count of the two kinds of yams
was 28 Nm, and their twist was 610 T/m. The
strength tester HD012N was used to test their
breaking strength. Table II shows the results. Here,
the breaking strength of Solospun yams is obviously
higher than that of ring spun yarns, which agrees
with our theory.

15. The specific twisting mechanism of the Solospun
technology
means the twist amplitude is distributed more
evenly in yams and further increases the breaking
strength of these yams so that it is higher by about
15%
than that of ring spun yarns. This technology provides
advantages when developing light-weight fabrics.

16.  1. Fu, Peihua, The Study of Solospun Technology and
Structureof Solospun Yarns, Masters thesis, Shanghai,
2002.
 2. Hall, Terry, Solospun Technology, Textile Asia 7,
78(1998).
 3. Subramaniam, V., Compressional Behaviour of
Doublerove Yams, J. Textile Inst. (823), 214-220 (1993).
 4. Yu, Xiuye, "Spinning Principles," vol. 9, China
TextilePublishing House, Beijing, 1994, pp. 150-153.
Literature Cited…..