Study On Two - Component Spin - Bonded Friction - Drafting Device Based On "Trapezoidal" Structure

Bicomponent spun-bonded fabric processing technology is a breakthrough point of bicomponent spun-bonded research and new product development, and drawing process is the core of the bicomponent fiber processing technology. At present the fiber drawing two mainstream way is rigid holding roller drafting and flexible grip the air drafting. But roller drafting is too slow to meet the high-speed of the bicomponent spun-bonded production demand, so it couldn’t complete the online drafting; The biggest defect of air drafting is it needs high pressure to provide adequate drafting force. Based of the above reasons, the main content of this paper study is finding a kind of bicomponent spun-bonded friction-drafting device which has two-way grip and can complete online bicomponent spinning drafting of bicomponent spun-bonded fibers.Through the analysis of the stress mechanism of bicomponent fiber in the structure of "trapezoid" friction, Building the force model of "Trapezoid" structure of the friction device. Study finds that the paper model has higher contact ratio with the measured values. It shows that the model can be used to predict the force of bicomponent fibre in the "trapezoid" structure of the friction.By using numerical simulation method to explore the wire passing performance of the friction device, and analyzing the air flowing characteristics of friction device, verifying air velocity of tube type drafting system. Study finds that the results of numerical simulation has higher contact ratio with the measured values. It shows that the numerical simulation can be used to characterization of air velocity distribution along the axis of the speed.Using RSM (Response Surface Methodology), and making "wire passing performance" as optimization rule. Finally, obtain the optimal structural parameters of friction device.Exploring affect of based on the structure of "trapezoid" bicomponent spun-bonded friction device to PET/PA6 hollow orange disc type bicomponent spun-bonded fibers. Study finds that the drafting wind pressure has a significant impact to diameter, mechanical properties and crystallinity of PET/PA6 hollow orange disc type bicomponent spun-bonded fibers, and in the same drafting air pressure the device has a significant impact to the properties of PET/PA6 hollow orange disc type bicomponent spun-bonded fibers.