Characteristics of double-core spun yarn

Release time:

2025-02-26

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Abstract

A double-core spun yarn is a type of yarn made by twisting together short fibers as the outer covering material and two filaments with different properties as the core filaments. Due to the contrasting properties of the two core filaments, they complement each other effectively, giving the yarn superior characteristics. For example, cotton-covered T400 plus spandex.

A double-core spun yarn is a type of yarn produced by twisting together short fibers as the outer covering material and two filaments with different properties as the core filaments. Due to the contrasting properties of the two core filaments, they complement each other effectively, endowing the yarn with superior characteristics. For example, a cotton-covered T400 plus spandex yarn—T400 boasts excellent bulkiness, outstanding elastic recovery, better dimensional stability than spandex, and higher strength. Spandex, on the other hand, is characterized by its high elasticity and ability to withstand repeated stretching. When these two filaments are used as core filaments and cotton fibers as the outer covering, the resulting yarn not only retains the excellent moisture absorption, softness, and elasticity of conventional cotton-spandex yarns but also exhibits enhanced strength, abrasion resistance, and dimensional stability. Fabrics made from this yarn offer a comfortable wearing experience, free from any feeling of tightness, pressure, or looseness. Moreover, they feature excellent abrasion resistance, high tear strength, minimal shrinkage, and excellent shape retention.

 

Key to Double-Core Yarn Production
Double-core yarn is produced by feeding two types of filament fibers into the nip between the front roller and the rubber-covered roller of a spinning machine via guide rollers, where they are wrapped and twisted together by short fibers. Different filament fibers require different levels of pre-drawing tension to bring out their respective characteristics. One of the key factors in production is precisely controlling the tension and stability of the filament fibers, ensuring consistent tension within each spindle as well as uniform tension among spindles. Fluctuations in filament fiber tension can directly affect variations in fabric width. Currently, the control of pre-drawing tension for spandex filaments has reached a mature stage; however, tension control for the other filament fiber remains under active exploration. At present, the actively fed filament fiber device is widely recognized as an effective approach.

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