noun
flat length (of a rubber band)
Technical term used in manufacturing and specifications for rubber bands, referring to the length when laid flat (not stretched).
この輪ゴムの折径は60ミリです。
The flat length of this rubber band is 60 mm.
折径と切幅の規格を確認してください。
Please check the specifications for flat length and cut width.
切幅 refers to the width of a rubber band when cut, while 折径 is the length when laid flat.
Compound of 折り (ori, 'folding') and 径 (kei, 'diameter' or 'path'), referring to the length of a folded or flattened object.