Filament polyester thread

Definition of Sewing Thread
Sewing thread, used in sewing machines to stitch various fabric products. Industrial sewing threads are predominantly polyester-based‌.

Types, Specifications and Applications of Sewing Thread
1. Synthetic Fiber Sewing Thread
Are the most commonly used type of sewing threads in the current market, have two main kinds: ‌polyester sewing threads‌ and ‌nylon sewing threads‌‌. Polyester sewing threads are further categorized into: ‌filament polyester sewing thread and spun polyester sewing thread.

2. Filament Polyester Sewing Thread‌ 
Also called high tenacity sewing thread, charactered by high tenacity, wear resistance, bright and good color fastness, but stiff and low elasticity‌.

3. Spun Polyester Sewing Thread
Charactered by soft, cost-effective and easy to sew, but prone to pilling and lower tensile strength‌.

4. Nylon Sewing Thread‌
Also called #polyamide sewing thread, twisted from 100% nylon filament, offers higher tenacity and elasticity, good abrasion resistance, ideal for stretchable fabrics but costly‌. Tayyon always only make nylon 6.6 sewing thread, few of nylon 6.

5. Bonded Thread‌
There are Bonded nylon thread and bonded polyester thread, reinforced with low-melting-point fiber inside multi-ply yarns during twisting, the fiber is melted to bond multi-ply yarns after heat set, Tayyon is using this inner bond technology. Bonded thread is charactered by high tenacity, heat-resistant, abrasion-resistant and multi-ply thread not loosening, it is suitable for thick fabric materials or premium leather products.

Bonded nylon 6.6 thread

6. Natural Fiber Sewing Thread
100% Cotton Thread, made from pure natural cotton, ‌charactered by heat-resistant and compatible with cotton fabrics, but weaker in strength, elasticity and durability, and costly..

7. Blended Sewing Thread
There are poly-poly core spun sewing thread‌ and cotton-poly core spun sewing thread, reinforced with high tenacity polyester filament fiber during twisting polyester or cotton staple fibers, to get higher tensile, balancing softness of spun sewing thread and high tensile strength, ideal for denim and fabric handbags.

Standards and Technical parameters for Sewing Thread

Core Quality Criteria of sewing threads is sewability, it is affected by below thread parameters:
1. Twist (TPM)‌: Balanced primary and secondary twists ensure smooth stitching and appearance.
2. Thread Breaking Strength (N)‌: Directly impacts stitching performance.
3. Color Fastness‌: Dry/wet rubbing fastness must be ≥ Grade 4 to prevent fading. ^[1]
4. Elongation Rate‌: Polyester sewing threads have lower elongation, nylon sewing threads have higher elongation.
5. Light Resistance‌: For some special products or outdoor goods, UV resistance could be enhanced via post-treatment.