介绍了塑料上销的技术要求、材质选择，通过纺纱对比试验和理论分析，说明塑料上销的应用可以提高成纱质量，是牵伸器材一次质的飞。
By comparative spinning practice, conclusion is made that plastic top cradle is capable of improving the yarn quality markedly as one of the drafting accessories.
介绍了塑料上销的技术要求、材质选择，通过纺纱对比试验和理论分析，说明塑料上销的应用可以提高成纱质量，是牵伸器材一次质的飞。
By comparative spinning practice, conclusion is made that plastic top cradle is capable of improving the yarn quality markedly as one of the drafting accessories.
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