Technological Properties And Color Variation Rule On Spun-dyed PET Filament Yarn

In order to improve the color fastness of military uniform, spun-dyed multi-crosssection and component composite textured PET filament yarn is used in new generationmilitary uniform, and the properties and color variation rule on spun-dyed PET filamentduring processing are studied.In the thesis, the correlative theory on the color of fiber is studied. On the basis of theacquired research the thesis summarizes the reasons how an object shows its color anddiscusses the basic color definition of an object combining with relevant knowledge suchas physics, physiology, psychology and so on, and systematically offers the colorfundamental properties of an object. At the same time, the interaction rule on fiber andlight is theoretically analyzed, and based on the fundamental theory on physical optics, themathematic rule on light's external and internal reflection and absorption for many times isdeduced, and the basic model of mathematics equation on diffuse reflection light intensitydistribution on the surface of fiber is obtained. Besides this, the thesis also systematicallydiscusses the physiological and colorimetry elements of color during the process of colorsensitivity,and synthetically analyses the rule on color of fiber combining the physical,physiological rules with psychological factors. The thesis demonstrates that the lightness ofspun-dyed filament yarn is mainly affected by external and internal reflection light of thefiber, and its saturation and hue is mainly affected by internal reflection.Proceeded from engineering and regarded actual industrial production as an object ofresearch, influences by the colorant addition on the intensity of spun-dyed PET POY andthe variation rule of intensity-elongation property and heat-shrinkable character ofspun-dyed PET fiber are analyzed respectively. Simultaneously, particular attention is paidon the color variation rule of spun-dyed multi-cross section and component compositetextured PET filament yarn and its fabric during processing. The following conclusions canbe drawn from this work. (1) With the increase of the fiber linear density, the lightness andsaturation of spun-dyed PET filament yarn will vary with the fiber linear density accordingto the rule of negative exponent. However, the basic hue remains unchangeable. (2) Of alldifferent shapes of fiber cross-section, the color of pentalobal cross-section filament isobviously lighter than the round one, and there is marked difference between the two hues.(3) Of different processing styles, the color of elasticized filament is obviously lighter and morebrilliance than that of parallel draft filament with the same linear density. (4) Adopteddifferent technological parameters, the elasticizing texturing effect of textured filament isdifferent. The color of fiber with good degree of crimp by elasticizing texturing is lighter,and the basic hue will be unchangeable. However, with the variation of drawing ratio, thecolor of spun-dyed filament (the same linear density) will be unchangeable on the whole.(5) With the increase of twists, the lightness and saturation of the yarn will vary with thetwist according to the rule of negative exponent, and the proporation of external reflectionlight will decrease, which causes its hue to be slightly partial to "blue" shade. (6) With theincrease of fabric's deweighting rate, the color of spun-dyed PET filament fabric will be"darker" and "duller". Simultaneously, the hue of the fabric will be partial to be"blue-green" shade. (7) The lightness, saturation and hue of the fabric under differenttemperature heat setting show no obvious regular difference, that is, the color of fabric willbe no variation after heat setting, which indicates the colorant selected in this work have nophenomenon of thermal migration and sublimation and possesses good heat endurance.As a result of the fact that the research is based on actual production equipments andtechnological conditions, the theoretical research is closer to the situation of actualproduction in the factory, and it provides an important theoretical guidance for the workingout of actual production technology and the control of production process.