Application of Heat Treatment for Coloration and Hairiness Reduction of Wool Yarns

ABSTRACT

Novel water and dye-free heat treatment method was used to color wool yarn. The heat treatment can not only give the white wool yarn new color but also minimize the yarn hairiness. The influences of heating treatment temperature and time on the wool yarn color were investigated. The microstructure, twist, hairiness, wear resistance, moisture regain and tensile strength of the wool yarn were evaluated to analyze the physical and mechanical properties changes after heat treatment. The results showed that the color strength of wool yarn increased with increasing the heat treatment temperature and time. The hairs equal to or longer than 3 mm reduced significantly after heat treatment. The microstructural structure has no significant change after heat treatment, the unique overlapping scales structure on the surface still observed clearly by the SEM. The tensile strength and wear resistance of wool yarn would decrease with increasing heat treatment temperature and time, and the tensile strength retention was higher than 80% after heat treatment which could meet the requirement in daily applications. Therefore, the heat treatment is an environmentally friendly method to endow wool yarn color and it has a potential in the textile industry.

摘要

采用一种新型的无水无染料热处理方法对毛纱进行染色. 热处理不仅能使白毛纱获得新的颜色，而且能使毛羽最小化。研究了热处理温度和时间对毛纱颜色的影响. 通过对羊毛纱线的微观结构、捻度、毛羽、耐磨性、回潮率和拉伸强度的测试，分析了热处理后羊毛纱线物理力学性能的变化。结果表明，随着热处理温度的升高和时间的延长，毛纱的色强增加. 热处理后，等于或长于3mm的毛发明显减少. 热处理后的显微组织没有明显变化，扫描电镜观察到表面独特的重叠鳞片结构. 随着热处理温度的升高和时间的延长，毛纱的拉伸强度和耐磨性降低，热处理后的拉伸强度保持率达到80%以上，可以满足日常使用的要求. 因此，热处理是赋予毛纱颜色的一种环保方法，在纺织工业中具有一定的应用潜力.

KEYWORDS:

• Coloration
• wool yarn
• heat treatment
• hairiness
• dye-free
• water-free

关键词:

• 着色
• 毛线
• 热处理
• 毛茸茸的
• 无染料
• 无水的

Acknowledgments

This work was supported by Key Laboratory of Textile Fiber & Product (Wuhan Textile University), Ministry of Education (FZXW2017002).

Additional information

Funding

This work was supported by the Key Laboratory of Textile Fiber & Product (Wuhan Textile University), Ministry of Education [FZXW2017002].