由于罗布麻纤维较粗，刚性大，在纺纱前必须进行预处理，以降低罗布麻纤维的刚性，提高其可纺性。

For coarse fiber and big stiffness of apocynum fiber, pretreatment should be done before spinning to reduce the fiber stiffness and enhance fiber spinnability.

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苎麻纤维由于分子排列整齐、 结晶度高、刚度大，故导致苎麻织物在穿着过程中产生刺痒感。

The neat arrangement of molecules, high crystallinity and high stiffness makes ramie fiber fabric feel itchy to skin.

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