Investigation On The Apparatus For Melt Spinning And Cooling A Group Of Filaments

With the increase of performance, quality and demands of the chemical fibers, spinning equipment is developing for high-speed, poly-cell, short-distance, high-efficiency. So the new technological requirements for cooling device are put forward. Because the central cooling apparatus has excellent cooling performance, fine fiber quality, jumbo variety range and technology regulation ability, rational spinning position, small location distance and compact spinning production line, it would be the first-selected device.An experimental investigation of the blowing chamber of cooling device is presented in this paper.lt includes the choose of the kind of the rectifying material, which influences the flowing states of cooling air and the value of friction factor; and design of the blowing chamber, which determines the axial speed distribution in the cooling area and the value of resistance coefficient.Firstly, the sintered metal porous material is determined be used for rectifying tube after the experiment comparison of 4 types and 6 kinds of porous materials. The experiment result of the sintered metal tube shows that the uneven rate of axial blowing is lower than 10%, and the flow is steady. Further more, from the theory analysis, it can be concluded that air in the sintered metal porous material can be transited from the laminar flow to the turbulence gradually with the change of Reynolds number. So Reynolds number is determined by the theory of porous medium, which can reflect the laminar state of the cooling air . Then the hole rate of the sintered metal porous material and the diameter of the sintered ball can be calculated.Secondly, 3 schemes for the axial rectifying of the blowing chamber are put forward in this paper. After analyzing separately, the interior cone made of porous board is chosen, which can adjust the axial velocity distribution of blowing. The result of the experiment analysis shows that axial uneven rate of the porous board cone can be adjusted by changing the top of the cone. According to the velocity distributions of the 3 schemes, the model of the blowing chamber can be set up by conservation energy law and mass continuity law, then Matlab is used to calculate the diameter of the cone, and finally 3 kinds of the blowing chamber constructions are attained.After all, the performance of new blowing chamber is verified by comparison of experiment, In the lab, the result shows that the axial uneven rate of the. blowingchamber is lower than 2.09% and the axial uneven rate of the velocity distribution is 3.13% and the resistivity is 1581Pa. It is to say that the uneven rate of cooling wind velocity is smaller than 10%, the resistivity is lower than 1600Pa and the models are reliable. While at the factory, the axial uneven rate of the blowing chamber is 9.34%, the axial uneven rate of the velocity distribution is 9.97% and the resistivity is 1381Pa. Which can prove the rationality of the models further more.In general, this work presents the instruction to the transformation of the device and the development of the industrial technology of melting spinning. And it also enhances the significance of the performance, new technology and the application.