By comparison of the test between C 4 card and FA201 cards,the author points out that the short fibre content in C 4 card sliver is higher became there are more 6 mm short fibre in short fibre content,which does not influence the yarn qualities much.

• 通过C4 型梳棉机和FA201 型梳棉机大面积对比实验发现，C4 型梳棉机生条短绒多主要是6mm 长的短纤维含量高，但对成纱质量无显著影响；