For the first time in 1960, in Japan, two types of yarn with different properties were combined with each other with the aim of creating a different yarn, and this yarn was called Shingosen (meaning new synthetic yarn). The continuation of the research included the combination of two or more types of yarn with different characteristics (especially thermal shrinkage). Today, ITY yarns, which stand for Intermingled Textured Yarn or Interlock Twist Yarn or Interlace Textured Yarn, are produced from the combination of POY and FDY yarn with different shrinkage percentages. Also, the term (BSY) Bi-Shrinkage Yarn, which means a yarn that shrinks in itself, is also used for ITY yarn.
Method of production:
In the two-step method, POY and FDY yarns are produced in separate processes and then merged together. The following methods are usually used to integrate these yarns in the two-stage production method:
Integration of yarns on the tension-swing machine
Merging of yarns on the stretching-twisting machine
Consolidation of threads on the single-wheel machine
Due to the increase in the use of ITY yarns in the textile industry, the mentioned methods are not cost-effective, so the single-step production method of ITY yarn is used.
With the development and optimization of spinning melting machines, it is possible to produce ITY yarn in one step. In this method, POY yarn and FDY yarn are produced and integrated in a spinning melting machine. This method increases the production speed of ITY yarn to more than 3200 meters per minute.
The following types of fabrics produced from self-textured filament yarn:
- The soft underhand of peachskin fabric (peach skin)
- Silk underwear (scroop cloth)
- Subordinate to Shantung