压梗和切梗工序对片状梗丝成丝特性的影响

为探讨片状梗丝成丝特性，采用常规切丝机（SD5辊切式）和新型复切设备（轧切式）对片状梗丝进行复切，对比分析丝状梗丝物理特性。结果表明:（1）与压梗相比，未压梗处理后梗片结构稍有提高，表观密度和真密度降低，剪切力和穿透力强，柔软度好，抗破碎性较好；（2）试验范围内，随着切梗厚度的增加，梗片尺寸增加，表观密度、真密度以及力学特性指标整体上呈现增加趋势，当切梗厚度为0.15 mm时梗片耐加工性好；（3）复切后丝状梗丝结构变化明显，尺寸减小，与常规切丝机（SD5辊切式）相比，轧切式复切设备制得丝状梗丝具有较高的填充值和弹性，梗丝宽度均匀性较好，成丝效果明显。（4）生产线验证结果表明:轧切式复切设备运行稳定性较好，无故障率为98.04%，梗丝宽度合格率和出丝率分别达到99.4%和68.68%，出丝质量较辊切式复切有所提高。 

Effect of stem rolling process and stem cutting process on filamentation characteristics of flake cut stem

In order to explore the filamentation characteristics effect of flake cut stem, conventional cutting machine (SD5 roll cutting type) and new cutting equipment (crush cutting type) were used to recut the flake cut stem, and then the physical characteristics of filamentous cut stems were analyzed. The results showed that: (1) Comparing with rolled stem, unrolled stem had better structure, lower apparent and true density, higher shear force, penetration, softness and crush resistance; (2) The size, apparent density, true density and mechanical properties of cut stem generally showed increasing trend with the increase of stem thickness, the processing resistance of cut stem was the best when stem thickness was 0.15mm; (3) The cut stem exhibited an obvious change of structure after recutting, with its size being reduced. Compared with roll-recutting (SD5), filamentous cut stem made by crush-recutting had a higher filling value, elasticity, homogeneity and filamentation effect. (4) The verification results of the production line show that the crush-recutting machine had a stable operation, with failure free rate of 98.04%, qualified and silk yielding rate of filamentous cut stem of 99.4% and 68.68%, which could improve the silk yielding quality.