When stretch polyester is pulled lengthwise, its width may reduce. This cross-direction response can be described using the concept of Poisson’s ratio.
What Does It Describe?
Poisson’s ratio compares the strain that occurs sideways with the strain applied in the main pulling direction. In fabrics, the behaviour is more complex than in solid materials because yarns can rotate, loops can open and elastane can recover.
Why It Matters in Stretch Garments
Leggings, compression wear and fitted sportswear can become narrower as they stretch around the body. This affects pressure, fit and visual opacity.
What Changes the Response?
- Knit structure
- Elastane percentage
- Yarn arrangement
- Heat setting
- Stretch direction
Buyer Relevance
Two fabrics with the same stretch percentage may still narrow differently. This can change how they feel on the body and how patterns should be graded.
Common Mistake
Do not evaluate stretch only in one dimension. Width loss during extension can influence comfort and opacity just as much as stretch percentage.
Final Takeaway
Poisson-type behaviour helps explain the relationship between stretch and crosswise narrowing in polyester-Lycra fabrics.
Need Help Choosing Polyester Fabric?
Share your garment type, GSM, DIA / width, colour, quantity and end use with Walrus – Yes India Can. We can help shortlist suitable polyester fabrics for bulk production.
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