锦涤皮芯型复合丝生产工艺的探讨

Discussion on the spinning technology of core-sheath type PA6/PET composite yarn

目前市场上锦涤皮芯型复合丝以78 dtex/24 f为主,存在着产品同质化严重、缺乏竞争力的现象,另外锦涤皮芯型复合丝作为涂层织物用途的主要原料,其产品单丝纤度直接影响着丝束之间的间隙大小,间隙越小,涂层印刷后的黏合力和水洗牢度越高。以锦纶为皮层材料,涤纶为芯层材料,成功地开发出新规格78 dtex/48 f的锦涤皮芯复合丝。通过一系列实验表明,选择锦纶占比为25%~40%,锦纶螺杆温度为255~265℃,涤纶主箱体温度为280~285℃,锦纶副箱体温度为260~268℃,冷却风速为0.3~0.5 m/s,含油率为0.6%~1.1%,拉伸温度为70~85℃,定型温度为125~145℃,拉伸倍率为2.5~3.5,纺丝速度为3800~4500 m/min,成功制备出单丝纤度更细且性能与常规纯锦纶6纤维接近的锦涤皮芯复合丝78 dtex/48 f。

At present,the PA6/PET sheath-core composite yarn 78dtex/24f is the main type in the market,and there is a phenomenon of serious product homogeneity and lack of competitiveness.In addition,the PA6/PET sheath-core composite yarn is used as the main raw material for coating fabrics.The size of the monofilament directly affects the size of the gap between the centripetal bundles.The smaller the gap,the higher the adhesion and washing fastness of the coating after printing.With nylon 6 as the skin material and polyester as the core material,a new specification of PA6/PET skin-core composite yarn 78dtex/48f has been successfully developed.A series of experiments show that,when the proportion of PA6 is from 25%to 40%,the PA6 extruder's temperature is between 255℃to 265℃,the PET main box temperature is between 280~285℃,the PA6 auxiliary box temperature is between 260~268℃,the cooling wind speed is 0.3~0.5 m/s,the oil content ranges 0.6%~1.1%,the stretching temperature is between 70~85℃,the heat-setting temperature is between 125~145℃,the drawing ratio is between 2.5~3.5,the spinning speed is between 3800~4500 m/min,the PA6/PET core-sheath composite yarn 78dtex/48f can be created,which has finer monofilament fineness and similar performance to conventional pure nylon 6 fiber.