Source: www.suessen.com



A very important issue concerning EliTeQCompact Yarn is the improved warping performance due to its increased strength.


Normally, when a yarn has an increased strength, the performance of this yarn in warping is ultimately increased, too. But this concept is no more valid now, especially in case of compact yarn. It is a well-known fact that even with low twist; compact yarns have an up to 20% higher strength than normal ring-spun yarns.


This misconception may divert spinners attention to reduce twist below the limit, which is definitely required for certain fibre lengths to achieve a certain elongation of yarn. Because even with a slightly good strength, the performance of compact yarn on weaving machines is almost the same as normal ring-spun yarn (in any case performance on loom is always excellent). We can understand this by the following experiments.


Experiment A



Conventional ring-spun yarn

EliteCompact Yarn

Cotton length

28 mm

28 mm

Count (NEC)

40/1

40/1

T.M.

4.3

3.8

TPI

27.2

24.03

Strength (Lbs)

60

65

CLSP

2400

2600

RKM

15.36

16.64

Warping Breakage per Million Meters

0.7

0.7


This experiment shows no difference in warping performance between conventional ring-spun yarn and compact yarn. EliTeQYarn even has much better strength.


Experiment B



Conventional ring-spun yarn

Conventional ring-spun yarn

Cotton length

28 mm

32mm

Count (NEC)

40/1

40/1

T.M.

4.3

3.6

TPI

27.2

22.77

Strength (Lbs)

60

65

CLSP

2400

2600

RKM

15.36

16.64

Warping Breakage per Million Meters

0.7

0.9


In this experiment both yarns are normal ring spun. One yarn with long fibre length and with very low twist multiplier has a higher strength value, but performance in warping is inferior.


 

Both experiments prove this ideology that strength is not the only parameter to improve performance in warping. The most important factor to improve warping performance is twist, because a certain amount of yarn twist depending on the given fibre lengths - is definitely required to hold the fibre bundle and to bear warping force.


Now the question arises regarding the benefits of yarn production on spinning frames, applying low twist philosophy.


Its answer is that a production benefit is indeed achieved if twist is lower than that of normal ring-spun yarn, but this difference in twist (T.M) should not be based on yarn strength. It must be at the limit, as a certain amount of twist is required in any case, to bear warping tension and force.


So ideally twist in compact yarn should be 8% less than that of normal ring yarn. This 8% lower twist plus increase in spindle speed (compared with normal ring yarn) will provide a production advantage.


Another important feature is the performance on loom after sizing. Even with a low performance in warping, the same yarn will perform much much better than normal ring-spun yarn, so that loom efficiency is increased by about 4-5% with compact yarn. This is owing to low hairiness and slightly lower twist than that of conventional ring-spun yarn.


In conventional yarn, all fibres of the yarn including hairs (short and long) are covered with a film of sizing material.


These hairs, and especially long hairs, are part of the yarn, but have no contribution to loom working, and furthermore these hairs disturb the shedding process on a loom, and are one of the reasons for warp breaks on loom.


EliTeQYarn has no such long hairs, which allows a good sizing of the yarn and also provides a perfect shedding process on the loom.


As a result of all these advantages, not only loom efficiency is very good, but also the quality of the fabric, almost free from loom start mark, due to less loom stops.


About the Author:


The author is associated with Gadoon Textile Mills as Technical Director.



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