1. Introduction

Polyester POY (Partially Oriented Yarn) is the primary form of yarn produced by spinning polyester chips (PET) at high speeds. Unlike FDY, POY is only partially stretched during the spinning process. This results in a molecular structure that is not yet fully stable, making it the ideal "precursor" or raw material for further texturizing and processing.

2. Composition and Structure

• Material: 100% Polyethylene Terephthalate (PET) Polymer.

• Molecular State: The polymer chains are partially aligned along the fiber axis but remain relatively loose and unoriented.

• Physical State: The yarn has very high elongation, a slightly tacky surface, and is less lustrous than FDY.

3. Key Characteristics

• Extreme Elongation: Typically ranges from 100% to 130%, allowing the yarn to withstand significant drawing during the texturizing (DTY) process.

• Processing Versatility: It serves as the main feedstock for producing DTY (Drawn Textured Yarn) and ITY (Intermingled Yarn).

• Storage Sensitivity: POY has a specific shelf life; if stored for too long, its physical properties may shift, potentially causing issues during downstream processing.

• Luster Variety: Available in Semi-Dull (SD) or Bright (BR) options depending on the end-use requirements.

4. Technical Specification Table (Reference)

Virgin / Recycle

Soft package (Virgin/Recycle)

High Stretch Yarn (Virgin/Recycle)

Quick Dry (Virgin/Recycle)​

Virgin / Recycle

+ Semi Dull / Raw White

Soft package (Virgin/Recycle)

+ Semi Dull / Raw White

High Stretch Yarn (Virgin/Recycle)

+ Semi Dull / Raw White

Note: The Denier of POY is always higher than the final DTY product because the yarn thins out during the drawing process.

5. Practical Applications Table

As an intermediate product, POY is primarily used in the manufacturing of other yarn types:

6. Comparison Table: POY vs. DTY vs. FDY

This table highlights the key differences between the three most common types of polyester filaments: