Nylon is a synthetic fiber known for its high tensile strength, abrasion resistance, chemical stability, and elasticity. These properties make it one of the most widely used materials in both textiles and industrial applications. A key development in nylon processing is the production of nylon twisted yarn, also called high-strength twisted yarn, which is achieved through controlled twisting technology. This process not only strengthens the yarn but also enhances its functionality, making it suitable for demanding applications ranging from apparel fabrics to heavy-duty industrial threads.
In the nylon production process, the twisting technology can easily twist the yarn together to form a thicker thread and enhance its strength and elasticity. The purpose of twisting is to increase the strength and elasticity of the yarn and improve the resistance of the yarn to deformation forms such as stretching, twisting, and deformation.
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Twisting Technology in Nylon sewing Thread Production
Twisting is a critical process in yarn manufacturing. It involves rotating individual filaments or yarn bundles around their axis, creating a helical structure that consolidates fibers and improves cohesion. The main objectives of twisting in nylon sewing thread include:
- Increasing tensile strength and breaking resistance.
- Enhancing elasticity and recovery performance.
- Reducing fuzzing, pilling, and yarn breakage during processing.
- Improving resistance to deformation from stretching, torsion, or bending.
Two Steps in the Twisting Process of Nylon Sewing Thread
- Forming Twist
Multiple single yarns are twisted together by a forming machine to create one cohesive strand. This step provides the basic structural strength of the thread. - Whole Strand Twist
The formed yarn is further twisted to increase compactness, shorten its effective length slightly, and significantly enhance strength and durability. Within forming twist, two methods are commonly used:- Unidirectional twisting: All yarns are twisted in the same direction, resulting in high compactness but potential torque in finished threads.
- Bidirectional twisting: Yarns are twisted alternately in opposite directions, producing a balanced yarn with improved stability and reduced torque.
Three Major Functions of Nylon Twisted Sewing Thread
- Enhanced Mechanical Strength
Twisting increases friction and fiber-to-fiber cohesion, which improves wear resistance, reduces fuzzing, and minimizes thread breakage. This makes fabrics more durable and reliable under mechanical stress. - Aesthetic and Structural Design Effects
Twisted yarns impart unique fabric appearances such as luster, refraction, crepe effects, wrinkles, and loops. These effects expand the design possibilities in fashion, upholstery, and decorative textiles. - Improved Elasticity and Comfort
High-twist yarns increase fabric elasticity, wrinkle resistance, and breathability. Strong-twist fabrics feel cooler and more comfortable, making them ideal for summer wear and performance apparel.
Performance Characteristics of Nylon Twisted Sewing Thread
- Tensile strength: 6.0–8.5 g/den (depending on twist and denier).
- Elongation at break: 18–25%.
- Abrasion resistance: 5–10 times higher than cotton or rayon.
- Heat resistance: Stable up to ~150 °C, softening above 180 °C.
- Chemical resistance: Excellent resistance to alkalis, moderate resistance to acids.
- Moisture absorption: ~4% regain, contributing to comfort in apparel.
Conclusion
Nylon twisted Sewing thread represents the synergy between nylon’s inherent properties and advanced twisting technology.
By carefully controlling twist direction, intensity, and processing steps, manufacturers can design yarns with specific mechanical strength, elasticity, and aesthetic effects. This versatility enables nylon twisted yarn to serve as a core material in textiles, fashion, and industrial products.