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Core Spun Yarn

What does Core Spun Yarn mean?

A yarn in which a base yarn is completely wrapped by a second yarn.

Heddels explains Core Spun Yarn

Core spun, or “polycore”, yarn is created by twisting staple fibers around a central filament core, usually made of polyester for extra strength.

It is 40% to 50% stronger than normally spun yarn of the same weight, and reduces the number of broken stitches when sewing seams and hems on denim.

Additional Resources

Diagram of core spun yarn:

Raw Denim Term - Core Spun Yarn

Source: stphilsaleveltextilesdept.blogspot.com

Breakage of Core Spun Yarn v.s. Spun Poly Yarn:

Raw Denim Term - Core Spun Yarn

Source:  denimsandjeans.com