Change and Redistribution of Immature Fiber Number during Cotton Carding Based on Different Taker-in Speeds

The change and redistribution of immature fiber number after cotton carding were investigated under different taker-in speeds.The immature fiber contents (IFCs) of card sliver,flat strips,takerin droppings and cylinder screen droppings (including droppings under cylinder screen and cylinder-doffer triangle section) produced under different taker-in speeds were tested by using USTER advanced fiber information system (AFIS). Based on these results and relevant data,immature fiber number was calculated. Results show that the carding process makes the immature fiber number increase. After carding, immature fibers are distributed mainly in card sliver,accounting for approximately 90% in their total number. All of the cylinder screen,taker-in and flat have the functions of excluding immature fibers; furthermore,IFC in cylinder screen droppings is the highest,followed successively by those in taker-in droppings,flat strips and card sliver. The IFC of card sliver is the lowest when the taker-in speeds are 1000 and 1400 r/min.

盖板速度对盖板花和生条质量的影响

研究盖板速度变化对盖板花和生条质量的影响。用USTER AFIS单纤维测试仪对FA201B型梳棉机在三档盖板速度条件下所加工的盖板花和生条进行了测试。结果显示:盖板速度为260 mm/min时盖板花中棉结含量最多,盖板速度为210 mm/min时盖板花中短绒最多,盖板速度为153 mm/min时盖板花中杂质含量和未成熟纤维含量最多,盖板花中未成熟纤维含量是生条的2倍且盖板花中未成熟纤维含量达10%以上,说明盖板花中不容易发现未成熟纤维的观点是不正确的。认为:盖板速度为153 mm/min时总体上最有利于生条质量的改善。

梳棉机锡林速度对未成熟纤维含量的影响

研究了梳棉机锡林速度变化对未成熟纤维含量的影响问题。研究结果显示,锡林速度对未成熟纤维含量的影响是显著的:在梳棉、头道并条过程中,未成熟纤维含量均逐渐减少,未成熟纤维含量并不随着锡林速度的提高而成线性变化,先是减少而后逐渐递增;在二道并条过程中,未成熟纤维含量随着锡林速度的提高而增加。

梳针分梳板对未成熟纤维去除的影响

为了研究梳针分梳板对未成熟纤维去除效果的影响,用USTER AFIS测试仪对梳棉机加装梳针分梳板、锯齿分梳板、小漏底在不同隔距、刺辊速度、道夫速度等生产条件下,所加工生条进行未成熟纤维含量检测,结果显示:①梳针分梳板去除未成熟纤维的能力不如锯齿分梳板;②加装小漏底对未成熟纤维的去除,不如锯齿分梳板,而比梳针分梳板稍好一些;③加装梳针分梳板时生条纤维成熟度比最小;④加装梳针分梳板时生条纤维细度最细。

原棉未成熟纤维含量与成纱质量

棉纤维的成熟度、原棉的未成熟纤维含量是影响原棉短绒率、疵点的关键,棉纤维的成熟度、原棉未成熟纤维含量主要因素是由棉花的栽培条件决定。分析了原棉未成熟纤维含量与清梳工序半制品质量和精梳工序质量的关系,原棉中的未成熟纤维必须在配棉、清梳和精梳工序进行控制,才能控制梳棉条、精梳条和成纱质量。原棉未成熟纤维含量不仅影响梳棉条、精梳条的短绒率、棉结、带纤维籽屑等疵点,而且严重影响成纱的各类主要疵点。