Conventional DTY Polyester Yarn production process is v […]
Conventional DTY Polyester Yarn production process is very mature, a large number of theoretical research and production papers published. But shaped polyester DTY processing technology reported little. In this paper, the effects of the second hot-box temperature (t2, DR and D / Y) on the crimp and mechanical properties of the finished fiber were analyzed through the comparison of various technological conditions during the production of regular terylene DTY and octahedron and triangular hollow terylene DTY. The suitable eight-leaf, triangular hollow fiber DTY production process conditions.
This is due to the fact that when the shaped fiber is spun, the longitudinal single fiber has a larger surface area than the circular fiber, the cooling speed is fast, the pre-orientation of the fiber is relatively high, and the natural stretch ratio is decreased. According to the data in Table 2, under the condition of basically the same raw fiber fiber-forming conditions, the DR parameters are adjusted and the other polyester DTY production process parameters are unchanged. As the DR increases, the breaking strength of the fiber increases, the elongation at break decreases, Wool and broken head increased. Therefore, the DR of the profiled fiber during the tensile deformation is lower than that of the conventional fiber.
In the drawing machine, the raw POY is fed from the first roller and immediately drawn by the second roller and simultaneously subjected to the twisting action transmitted from the false twister, and then enters the first hot box, where the yarn is drawn Tensile strength, twist twisting force and heat under the action of the tensile, deformation, tension and other heat-setting process of deformation, with sufficient strength and bulkiness, when the deformed wire crimp rate (30% ~ 50%), less stable curl (50% ~ 70%), known as the pre-high wire. In the second hot box, the false-twist yarn was replenished with heat-setting treatment and was subjected to shrinkage heat-setting to reduce part of the internal stress. The crystallinity, density and crystallite size increased while the orientation factor Deformation orientation factor decreased, showing the nature of the crimp shrinkage decreased, curly stability improved. Fiber curl shape in the heat setting by the temperature changes also affect the fluffy with the temperature rise and decline. In order to obtain the shaped polyester DTY with good serviceability and elasticity, its curling performance is better when the temperature is controlled at 105 ℃.