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Research on the Elasticity of PTT/PET Bicomponent Fibier

Author: GuFei
Tutor: WangFuMei
School: Donghua University
Course: Textile Material and Textiles Design
Keywords: PTT / PET Spinning process Curl curvature Elasticity Fracture mechanism
CLC: TQ342.94
Type: Master's thesis
Year: 2011
Downloads: 89
Quote: 0
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Abstract


PTT / PET juxtaposed bicomponent fibers can be tied by PTT and PET two stars material composite spinning is made, in addition to having a PTT, PET respective performance characteristics, further comprising either a single-component fibers did not have three-dimensional fiber spatial shape curled, it is also referred to as \the unique elastic fibers present is mainly concentrated on the PTT / PET bicomponent fibers in spinning production technology and product properties (such as curled structure, tensile and elastic properties, etc.), but curled structure and the elastic properties. relations, fiber fracture mechanism is not sufficient research team already on the basis of this thesis, the main test to study the elasticity of PTT / PET bicomponent fiber extension and fracture properties of spinning and post-processing process relationship papers PTT / PET fiber fracture strength and elastic elongation of the equation predicted by the design parameters of the fiber, and concluded by spinning practice, validation, and further analysis of the factors affecting the performance of PTT / PET fiber. Featured content and conclusions are as follows: 1. by analysis under the process conditions of different spinning the PTT / PET juxtaposed bicomponent fibers tensile properties (including elastic elongation) found the PTT content within the range of 40-60%, PTT / PET fiber elongation at break and elastic elongation With the improvement of the PTT content increased, the breaking strength is not as PTT content increases but simply dropped; draw temperature within the range of 80-110 ℃ PTT / PET the elongation at break of the fiber and the elastic elongation of the impact is not significant, and the breaking strength decreases with increasing draw temperature; draft ratio in the range of 1.95-2.35, of PTT / PET fiber fracture elongation and elastic elongation after first raising With the improvement of the draft ratio reduce the fracture strength of the B-type fiber is lowered with the draft ratio improved to improve the fracture strength of the K-type fiber with the draft ratio improved; As two stars viscosity difference (PTT intrinsic viscosity) increases, the elongation at break of the PTT / PET fibers and elastic elongation increases, the breaking strength of the component ratio of 50/50 of the fiber with the two stars viscosity differences improve decreased fracture strength than when the fibers and other components along with the raise of the two stars viscosity differences increase. different spinneret obtained B-type and K-type PTT / PET fibers, fiber type B, the elongation at break and elastic elongation than the K-type fibers, but the breaking strength is less than the fiber of the type K 2. test analysis of the stress - strain curve of the PTT / PET juxtaposed bicomponent fibers the tensile rupture mouth morphology and a single fiber, proved PTT / PET bicomponent fiber fracture mechanism, PTT and PET fiber B and K series two components are linked closely together, fracture is greater, which the two component of the B-type fiber fracture simultaneity slightly fibers is greater than the K-type, this is type B fiber rupture strength lower than the one of the reasons of the K-type; type fiber B itself elongation is smaller than the K-type fibers elongation synthesis principle according to the force, the establishment of the PTT / PET bicomponent fibers the strength of the estimation formula, the calculated strength with measured values ??obtained closer PTT / PET bicomponent beam filament tensile curves indicate, the higher the PTT content of the respective single fiber breaking beam tensile not the same the greater the the beam filament elongation greater the computing model according to the curvature of DENTON, senior sister apprentice PTT and PET elastic modulus ratio and thermal shrinkage by PTT / PET dual the design information of the component fibers (cross-sectional structural parameters and the composition ratio, etc.), was estimated by the curvature of the curl of the PTT / PET fibers, and further obtain the linear fit equations for the calculation of curvature of the PTT / PET fibers Found elastic elongation according This equation and the curvature calculating method, initially in the design phase of the bicomponent fibers and to predict the elastic properties of the fibers, a certain reference value for the development of new fiber. 4. spinneret determines the cross-section morphology of the fibers and the interface of the two components morphology, by the self-designed two spinneret for spinning experiment, AB series (B) and AK series (K type) of different components than six kinds of PTT / PET fibers spun, by observing a cross-section of the fiber and vertical form, analysis of the influence of the fibrous structure of the spinneret; verify the validity of the above conclusions in this group of fibers, wherein the small differences in the elastic elongation of the elongation of the two series of the theory of elasticity of the fiber sample measured, and law and proved theoretical elastic elongation of the calculation method is effective.

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CLC: > Industrial Technology > Chemical Industry > The chemical fiber industry > Synthetic fiber > Other modification of synthetic fibers > Composite fiber
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