Knowledge

Staple yarns for carpets are mainly produced on semi worsted and wool systems. The worsted system is only used for some fine yarns because it is difficult to spin such yarns with uncombed slivers. In general, synthetic fiber yarns are spun on semi worsted systems, and most wool yarns are spun on wool systems

Although the wool spinning system has fewer processing steps, semi worsted machines are more efficient in producing medium count and fine count yarns. As the yarn count becomes finer, the relative conversion cost is conducive to semi worsted spinning, but semi worsted systems need raw materials with high average fiber length and strength and minimum short fiber content. On the other hand, the wool system is more flexible in its raw material requirements, and manufacturers are free to mix various types of wool, which together can give the carpet the required characteristics.

The trend of coarse pitch tufting is conducive to roving yarn, while semi worsted yarn is conducive to fine pitch. In fact, the usually tight properties of semi worsted yarns can be used to advantageously obtain carpets with particularly dense, high quality and fine structure, including cut velvet and loop velvet.

Roving yarn is usually fluffy than semi worsted yarn; However, the use of highly crimped wool and synthetic fibers provides similar bulky yarns on both systems. The wool system can be easily used to introduce neps, flames, slubs or other colored effects to produce fancy yarns.

The tufting and weaving methods of wool carpet have different requirements for yarn specification and quality. Generally speaking, the standards of tufted yarn in raw material selection, spinning quality and yarn finishing need to be higher than those of woven carpet yarn.

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