Craft · 6 pages · 12 min
Why bias tape can turn a curve
Bias tape follows a curve because a diagonal cut lets woven yarns scissor and change length.
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From the opening
Bias tape can turn a curve because it is cut on the diagonal of the weave, where warp and weft can scissor instead of locking the strip at one fixed length. A straight-grain strip fights the curve, while a bias strip can lengthen on the outside of a bend and shorten on the inside. The opening covers true bias is the diagonal cut, yarn crossings shear into diamonds, and straight grain stays nearly fixed.
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Inside
- True bias is the diagonal cut
- Yarn crossings shear into diamonds
- Straight grain stays nearly fixed
- A hard pull lengthens the tape
- Where the idea stops applying
- A distinction worth keeping
Sources
- Bias stretch of woven cloth
- Bias binding on a curved edge