竹节纱粗细节形成机制及其纺纱工艺比较

为探究不同竹节纱生产装置的品种适应性,开发竹节纱新品种,根据纺制竹节纱时喂入粗纱根数、牵伸机构组成、罗拉变速方式、牵伸比调控方式的不同,将现有竹节纱生产装置分为单通道后罗拉喂入竹节纱装置、单通道中后罗拉喂入竹节纱装置、双通道中后罗拉喂入竹节纱装置、双通道后罗拉喂入竹节纱装置、三通道后罗拉喂入竹节纱装置共5种装置,系统分析了不同竹节纱生产装置形成粗细节的机制,构建了竹节纱可变线密度的计算公式。以调控线密度和混纺比变化为目标对5种装置纺制竹节纱的工艺特点进行了分析比较。利用三通道后罗拉喂入竹节纱装置纺制了粗细和混纺比均变化的彩色竹节纱。

Formation mechanism of thick and thin sections of slub yarn and comparison of spinning process

In order to explore the variety adaptability of different slubbed yarn devices and develop new varieties of slub yarn, existing slub yarn devices were classified into device for rovings fed from a back roller in a single channel, device for rovings fed from middle and back rollers respectively in a single channel, device for rovings fed from middle and back rollers respectively in dual channels, device for rovings fed from back rollers in dual channels and device for rovings fed from back rollers in three channels according to the different number of roving yarns, the composition of the drafting mechanism, the roller shifting method, and the drafting ratio control method when spinning slub yarns. The mechanism of the formation of thick and thin sections of different slubbed yarn devices was analyzed systematically, then the formula for variable linear density of slub yarn was constructed. The technical characteristics of the spinning slub yarn were analyzed and compared to control the changes in line density and blending ratio for five devices. Finally, a color slub yarn with varying thickness and blending ratio was spun in the device for rovings fed from back rollers in three channels.