Preparation and fuzzy evaluation of wool hollow yarn

Wool hollow yarn not only has the characteristics of being skin-friendly and warm, it also has good air and moisture permeability; thus, it has great development potential. Here, we first show that the water-soluble (polyvinyl alcohol (PVA)) fiber ratio in core-spun yarn should not exceed 30%; to ensure smooth spinning, a core yarn linear density of 3.4–5.6 tex was selected by theoretical analysis. Second, using rabbit hair fiber with tencel fiber, which has high tenacity, as an environmentally friendly blended outsourcing fiber, and water-soluble (PVA) fiber for the core yarn, we prepared five types of core-spun yarns. Water-soluble (PVA) fiber was removed in 20 min to prepare wool hollow yarn using room temperature water. Finally, properties of the wool hollow yarn produced, such as breaking strength, breaking elongation, evenness of CV (coefficient of variation) value, >3 mm hairiness index, and deviation from linear density after removing PVA, were tested and analyzed, and evaluated comprehensively by means of fuzzy mathematics. The results showed that the hairiness of wool hollow yarn was improved, the mechanical properties and evenness of sliver and hairiness were decreased, and the overall properties of hollow yarns with a core yarn content of 25% were the best.