Sewing Thread

• High strength: Its breaking strength is superior to that of sewing threads made from natural fibers such as cotton thread. It is not easy to break during the sewing process, can withstand large tensile forces, and is suitable for sewing thicker or stiffer fabrics, such as denim and canvas.
• Good wear resistance: The structure of polyester fiber makes it friction-resistant. During repeated sewing and use, the stitch is not easy to wear and break due to friction, which extends the service life of the sewn products.
• Strong chemical resistance: It has good resistance to chemicals such as acids, alkalis, and detergents. When washed or in contact with chemicals, the performance of the thread is not easily affected, and problems such as discoloration and deterioration are less likely to occur.
• Low shrinkage rate: Polyester has good stability, and the polyester sewing thread after treatment has a low shrinkage rate. The sewn clothes or products are not easy to deform due to the shrinkage of the thread after washing.
• Good light resistance: Compared with cotton thread, it is not easy to age and become brittle under sunlight, making it suitable for outdoor products or sewn products that are often exposed to light.

• High strength: The high strength of polyester itself combined with surface treatment makes the breaking strength of bonded thread much higher than that of ordinary polyester sewing thread. It can withstand large tensile forces and is suitable for sewing heavy fabrics (such as canvas, denim, leather) or load-bearing parts (such as luggage seams, tent corners).
• Abrasion resistance: The smooth surface coating reduces friction between the thread, the fabric, and sewing machine parts, extending the service life of the thread. It is especially suitable for high-speed sewing or scenarios with repeated friction (such as industrial machinery sewing, outdoor products).
• Wrinkle resistance and stability: The wrinkle resistance and low shrinkage rate of polyester are retained in the bonded thread. After the sewn products are washed or used, the stitches are not easy to deform or wrinkle.
• Chemical resistance: It has good resistance to acids, alkalis, detergents, etc., and is suitable for products that require frequent cleaning or contact with chemicals (such as work clothes, protective equipment).

• Combination of high strength and toughness: The core thread provides high breaking strength, ensuring the thread is not easy to break during sewing and making it suitable for sewing heavy fabrics (such as denim, canvas, and leather); the outer polyester layer enhances the thread’s wear resistance and friction resistance, extending the service life of the stitches.
• Smooth surface for smooth sewing: The coating of the outer polyester fiber makes the thread surface smoother, reducing the frictional resistance between the thread, the fabric, and sewing machine parts during sewing, and lowering the probability of thread breakage and fuzzing. It is especially suitable for high-speed industrial sewing.
• Good stability: The polyester outer layer has low shrinkage, chemical resistance (resistant to acids, alkalis, and detergents), and relatively good light resistance. The composite structure of the core thread and the outer layer reduces the deformation of the thread during washing or use, ensuring long-lasting and stable stitches.
• Wide adaptability: By adjusting the core thread material and the specifications of the outer polyester (such as thickness and twist), it can adapt to different fabrics and sewing needs, balancing strength and delicacy.

• High cost-effectiveness: The production process is relatively simple, and the cost is lower than that of filament threads or composite threads (such as bonded threads and core-spun threads). It is suitable for ordinary sewing scenarios sensitive to cost.
• Soft hand feel: The twisted structure of short fibers endows the thread with a certain degree of fullness and softness. After sewing, the stitches have a mild hand feel, making it suitable for scenarios with high requirements for touch, such as intimate clothing and thin fabrics.
• Moderate strength: Polyester itself has high strength, and the breaking strength of short-fiber threads can meet most daily sewing needs. However, it is lower than that of filament polyester threads (such as bonded threads) and is not suitable for high-strength load-bearing scenarios.
• Prone to fuzzing: Since the bonding between short fibers relies on twist, slight fuzzing may occur on the thread surface during long-term friction or high-speed sewing, and its wear resistance is slightly inferior to that of filament threads with surface treatment.
• Good stability: It inherits the characteristics of polyester, such as wrinkle resistance, low shrinkage, and chemical resistance (resistant to detergents, acids, and alkalis). The stitches are not easy to deform after washing.

• Smooth thread body with uniform diameter: The low-puff structure makes the thread surface flatter and ensures high consistency in thickness. During sewing, the stitches are clearer and neater, making it especially suitable for scenarios requiring high stitch precision.
• Enhanced wear resistance: The tight arrangement of fibers reduces the loosening of surface fibers. Compared with ordinary puffy short-fiber threads, it is less prone to fuzzing and pilling, extending the service life of the stitches.
• More stable strength: The tight structure reduces fiber slippage between fibers, and its breaking strength is slightly higher than that of ordinary polyester short-fiber threads of the same specification, resulting in a lower probability of thread breakage during sewing.
• Low shrinkage and stability: It inherits the low shrinkage characteristic of polyester, and the tight structure minimizes the deformation of the thread body after washing or stress, ensuring better stitch retention.
• Suitable for fine sewing: The thread body is firm and has moderate softness (but slightly stiffer than puffy threads), making it suitable for high-speed sewing or sewing of thin fabrics and fine fabrics. It is less likely to have problems such as bulky stitches or thread jamming.

Core Advantage (Most Prominent Feature): By adjusting fiber twist, using polyester fibers with hollow/irregular cross-sections, or applying air expansion treatment during spinning, more gaps are created inside the thread. This gives the thread a fluffy and plump appearance, along with a lighter and softer touch.

Inherits Basic Advantages of Polyester:

• High strength: Not easy to break, suitable for sewing scenarios requiring a certain degree of tensile force;
• Chemical resistance: Resistant to acids, alkalis, and detergents, with no easy deformation or fading after washing;
• Good stability: Low shrinkage, and better dimensional stability than natural fiber threads (e.g., cotton thread).

Unique Functions:

• Strong coverage: The fluffy thread can cover the fabric surface more evenly during sewing/weaving, reducing stitch marks and improving the appearance of finished products;
• Moderate elasticity: Some high-loft threads gain a certain elasticity through process adjustment, making them suitable for fabrics that require slight stretching (e.g., knitwear);
• Auxiliary warmth retention: The gaps in the thread can trap air when used in textiles, enhancing the fabric’s warmth retention (e.g., plush toys, linings of winter clothing).

Monofilament and Multifilament:

• Monofilament: A single continuous filament used directly. The thread body is relatively stiff and is often used in scenarios requiring shaping, such as fishing nets and sieves.
• Multifilament: Formed by combining and twisting multiple monofilaments. The thread body is soft and has higher strength, making it the main type for garment sewing and fabric weaving.

Basic Advantages of Filament Structure

The fibers are continuous filaments (with a length of up to several kilometers). After twisting, the formed thread body has a smooth surface and uniform evenness, without the fuzz and joints commonly seen in short-fiber threads. Therefore, it is not easy to pill or break during sewing or weaving, and the finished product has a neater and more delicate appearance.

Inherent Properties of Nylon Material

• High elasticity and resilience: Nylon’s elasticity is close to that of wool; it can fully recover when stretched to 3-6%. The thread made from it is not easy to deform after being stressed, making it suitable for scenarios requiring repeated stretching (such as stretch clothing and sports equipment).
• Excellent wear resistance: Its wear resistance ranks first among all textile fibers—10 times higher than cotton and 20 times higher than wool. Therefore, nylon filament thread is friction-resistant, anti-abrasion, and has a long service life.
• Relatively high strength: The strength changes little in dry or wet conditions, and its toughness is not easily reduced by moisture. It is suitable for use in special environments such as outdoors and underwater.
• Chemical resistance: It has good stability against chemicals such as alkalis and detergents, but it will be damaged if in long-term contact with strong acids, so it should be avoided in strongly corrosive environments.

• 15%-30% higher than ordinary nylon thread.
• Ultra-high wear resistance: Nylon itself has excellent wear resistance. After bonded treatment, the thread structure becomes more stable, and its friction resistance is further enhanced, making it suitable for high-frequency stress scenarios (such as luggage corners and shoe stitching).
• Tensile resistance and resilience: It retains the high elasticity of nylon, is not easy to deform after being stressed, and the stitched joints are not easy to crack due to pulling.
• Moisture and heat resistance: In humid or high-temperature environments (such as washing and outdoor rain), the strength decreases slightly, and it is more resistant to aging than ordinary nylon thread.
• Low fuzz characteristic: The surface film coating reduces fiber fuzz, resulting in neater stitches after sewing. It is especially suitable for precision fabrics (such as leather and waterproof cloth).

Ultra-High Strength & Wear Resistance

Car seats, safety belts, door panel fabrics endure constant stretching and friction (e.g., passenger entry/exit, seat adjustment). The sewing thread must have much higher breaking strength than regular garment threads, with no easy fuzzing or breaking after long-term friction.
It is usually made of high-strength fibers (nylon, polyester, aramid, etc.); high-strength industrial yarns are even used for critical parts like safety belt sewing.

Environmental Stability

• Temperature resistance: Withstands extreme in-car temps (over 70℃ in summer sun, below -30℃ in winter) without brittleness, deformation or significant strength loss.
• Light resistance: No fading or aging from long-term sunlight (especially UV), preventing interior seam splits due to thread breakage.
• Chemical resistance: Resists in-car contaminants (sweat, beverages, cleaners) without mildew or degradation.

Eco-Friendliness & Safety

Complies with automotive environmental standards (EU REACH/RoHS, China GB), containing no formaldehyde or heavy metals to avoid odors or health risks.
Flame retardancy is required for parts near the engine compartment to reduce fire risks.

Appearance Consistency

Thread color must match interior fabrics accurately, with high wash/light fastness to avoid fading/color bleeding.
Uniform thread evenness (no joints, minimal fuzz) prevents uneven stitches or exposed ends after sewing.