How is Polyester DTY Yarn Graded?​

The grading of Polyester Yarn DTY (Draw Textured Yarn) primarily depends on fiber quality, production processes, and performance indicators. Different grades directly affect the hand feel, strength, and end-use of fabrics.

Core Grading Standards for DTY:
1. Grading by Appearance and Defects (Industry Standard)

AA Grade: Nearly flawless (oil stains, stiff filaments, dyeing spots ≤1 occurrence/100,000 meters). Uniform luster and consistent crimp. Used for high-end apparel, luxury fabrics, and medical textiles.

A Grade: Minor defects (broken filaments ≤3 occurrences/100,000 meters). Slight color variance, not affecting overall usability. Used for branded garments and home textiles.

B Grade: Visible defects (broken filaments ≤8 occurrences/100,000 meters). Uneven crimp, often requiring subsequent processing to mask. Used for regular apparel and low-to-mid-range home textiles.

C Grade: Significant defects (frequent broken/stiff filaments). Noticeable color differences, unstable physical properties. Used for industrial cloth and filling materials.

2. Grading by Physical Performance (Internal Corporate Standards)

Premium Product: Breaking strength ≥3.5 cN/dtex, Elongation: 20%-30%, Boiling water shrinkage ≤3%.

First-Grade Product: Breaking strength ≥3.2 cN/dtex, Elongation: 15%-35%, Boiling water shrinkage ≤5%.

Qualified Product: Breaking strength ≥2.8 cN/dtex, Elongation: 10%-40%, Boiling water shrinkage ≤8%.