Effect of heat treatment on mechanical property of core-spun yarn from low melting point polyester filament made by air-jet vortex spinning
Objective Low melting point polyester fiber can be used as a hot-melt adhesive material.The strength of air-jet vortex spinning core-spun yarn is closely related to the mechanical properties of core-filament.We replace the core-filament of the air-jet vortex spinning core-spun yarn with a low melting point filament.By studying the appropriate heat treatment process,it can not only help the core-filament to maintain a certain mechanical properties,but also use the effect of thermal bonding enhancement of low melting point fibers to further improve the strength of air-jet vortex spinning core-spun yarn.Method The core-spun yarn with low melting point polyester filament wrapped by polyester staple fiber was produced on MVS No.870 spinning machine,and the yarn was subjected to non-contact heat treatment on the XPLORE flat traction heating device.The heat treatment process was designed based on Box-Behnken Design(BBD)response surface.The effects of heat treatment temperature,heat treatment speed and draft multiple on the breaking strength,breaking elongation and breaking work of core-spun yarn were investigated by statistical analysis method.At the same time,the response value was optimized to obtain the best heat treatment scheme for the preparation of high strength core-spun yarn.Results The breaking strength of the core-spun yarn was significantly affected by heat treatment temperature,heat treatment speed,draft multiple,as well as the interaction term of heat treatment temperature and heat treatment speed.The breaking elongation was significantly affected by heat treatment temperature,heat treatment speed,draft multiple,draft multiple secondary term,heat treatment temperature and heat treatment speed interaction term,and heat treatment speed and draft multiple interaction term.The breaking work was significantly affected by heat treatment temperature,heat treatment speed,draft multiple,heat treatment temperature secondary term,and heat treatment temperature and heat treatment speed interaction term.By analyzing contour plots of the relationship between response value and heat treatment process,it was found that under the same draft multiple,the breaking strength of the core-spun yarn showed an monotonous increase with the heat treatment speed increasing and the heat treatment temperature decreasing.The higher heat treatment temperature led to greater increase in the breaking strength of the core-spun yarn.In addition,at a stable draft multiple,when the heat treatment temperature was lower and the heat treatment speed was higher,the core-spun yarn breaking elongation was higher,and breaking work was higher.When the heat treatment temperature was constant,the breaking strength of the core-spun yarn would increase and the breaking elongation and the breaking work would decrease with the increase of the draft multiple.Combining the results of contour plots and response optimizer processing,the optimal heat treatment process parameters were obtained,with heat treatment temperature being 130℃,draft multiple 1.00,and heat treatment speed is 9 000 mm/min.After the heat treatment of the raw yarns,the yarn properties were improved,the longitudinal morphology of the core yarns became more compact,and some of the single fibers were bonded to each other in the cross-section.After the optimal heat treatment process,the yarn properties were improved,the longitudinal morphology of the core-spun yarn became more compact,and there was adhesion between some single fibers in the cross section.Conclusion Air-jet vortex spinning was to prepare low melting point filament core-spun yarn.Through heat treatment process,the core-filament was partially melted,effectively limiting the slip of fibers in air-jet vortex spinning,and the cohesion between fibers can be improved.The breaking strength,breaking elongation and breaking work of the yarn are closely related to the setting of heat treatment temperature,heat treatment speed and draft multiple.In general,with the decrease of heat treatment temperature and draft multiple,and the increase of heat treatment speed,the breaking strength and breaking elongation of core-spun yarn increase,so the breaking work also increases.Using the optimized heat treatment process,the core-spun yarn breaking strength is increased by 7.64%,the breaking elongation is increased by 9.34%,and the breaking work is increased by 13.78%.
air-jet vortex spinning core-spun yarnlow melting point filamentheat treatment processmechanical properties of yarnspinning technology
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