在纺制锦纶丝包芯纱时，选用的外包纤维细长、长度整齐度高，可以改善成纱条干和包覆效果，保证成纱质量。

When spinning polyamide filament core-spun yarn covering fibre should be finer, longer and higher uniformity, which could improve yarn evenness and covering effect and guarantee yarn quality.

youdao

但纯兔毛纱强力较小，可用涤丝包芯方式采加固。

But the tenacity of pure rabbit hair yarn is low.

youdao

用于测定棉、毛、麻、包芯纱的单根纱线及合成纤维长丝、变形丝的断裂强力和断裂伸长率。

Used for testing breaking tenacity, elongation at break of single yarn made of cotton, wool, jute, core-spun yarn etc, at the same time including synthetic fibre filament, textured yarns.

youdao