In the textile and garment manufacturing industry, thread selection directly impacts product durability, appearance, and production efficiency. Two common options used today are Spun Polyester Sewing Thread and Corespun Polyester Thread. While both are made from polyester, their structure and performance characteristics vary significantly, especially when it comes to tensile strength.

Understanding the Composition of Each Thread

What is Spun Polyester Sewing Thread?

Spun Polyester Sewing Thread is produced by spinning short polyester staple fibers into a continuous strand. The thread has a cotton-like appearance and soft texture, making it widely used in apparel, home textiles, and general sewing applications. Its feather-like surface also enhances friction during stitching, improving seam balance and reducing slippage.

What is Corespun Polyester Thread?

Corespun polyester thread features a strong filament polyester core wrapped with polyester staple fibers. This hybrid structure delivers smooth sewing performance while maintaining exceptional tensile strength and durability. It is especially favored for high-speed industrial stitching and heavy-duty products.

Strength Comparison: Which Performs Better?

Tensile Strength and Durability

• Spun Polyester Sewing Thread: Provides good overall strength but is limited by the short fibers used in its construction.
• Corespun Polyester Thread: Offers significantly higher strength due to its continuous filament core, making it more resistant to breakage.

Verdict: Corespun polyester thread clearly outperforms spun polyester in tensile strength and wear resistance, especially under high tension or rapid stitching conditions.

Performance in Industrial Use

• Spun polyester is suitable for standard apparel and medium-duty products where softness and cost-efficiency matter.
• Corespun thread performs better in jeans, leather goods, upholstery, and heavy fabrics that require superior seam strength.

Additional Factors Beyond Strength

Sewing Speed and Break Resistance

Corespun thread handles high-speed sewing exceptionally well, reducing breakage rates and machine downtime. In contrast, Spun Polyester Sewing Thread is more likely to fray under prolonged friction, especially on heavy industrial machines.

Cost and Fabric Compatibility

Spun polyester remains a cost-friendly choice for mass garment production. However, when long-term durability or load-bearing stitching is required, the investment in corespun polyester delivers better value over time.

Which Thread Should Manufacturers Choose?

Choosing between Spun Polyester Sewing Thread and corespun polyester thread depends on performance requirements. For everyday textile products, spun polyester offers balanced performance at affordable cost. However, for heavy-duty applications where seam failure is unacceptable, corespun polyester stands as the superior option.

FAQ: Common Questions from Manufacturers

1. Is Spun Polyester Sewing Thread strong enough for industrial stitching?

Yes, but not as strong as corespun polyester. It is best suited for medium-duty fabrics and garments.

2. Which thread is better for denim and workwear?

Corespun polyester is recommended due to its high tensile strength and abrasion resistance.

3. Is there a large price difference between the two?

Spun polyester is generally more affordable, while corespun polyester costs more but offers superior performance.

4. Does thread type affect sewing machine speed?

Absolutely. Corespun polyester tolerates high-speed sewing better, with fewer breakages or skipped stitches.

In conclusion, Spun Polyester Sewing Thread remains a versatile and economical choice for everyday apparel, but when top-tier strength and durability are required, corespun polyester thread proves to be the more reliable option. Understanding these differences helps manufacturers make smarter, performance-driven decisions.