Analysis on Pulsating Flow of Melt for Reciprocating Extrusion in the Screw Channel |
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| Authors: | Quan Wang |
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| Affiliation: | 1. The National Engineering Research Center of Novel Equipment for Polymer Processing, The Key Laboratory of Polymer Processing Engineering of Ministry of Education, South China, University of Technology , Guangzhou, P. R. China;2. Chen De Plastics Machinery Co.ltd , Shunde, P. R. China |
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| Abstract: | In the reciprocating extrusion, the vibration force field (VFF) is applied to the entire plasticating process by the axial vibration of screw and the novel concept on the polymer dynamic plasticating process being strengthened has been brought forward in the paper. The mathematical model is established that describes the plasticating process under the VFF and the approximative analytical solutions of the velocity distribution, pressure gradient in the screw channel and the plasticating capability are obtained. The theoretical results show that the axial vibration of screw can accelerate the blend capability of polymer and make melt temperature more uniform. With increase of the vibration intensity, the effect of blend and plasticating is enhanced further. The average pressure gradient drops down the channel under the VFF because of lower virtual viscosity of polymer melt and smaller flow resistance in the channel. The comparison between the theoretical analysis and the experimental results shows the plasticating capability of melt is improved with increase of vibration intensity. |
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| Keywords: | Melt flow Plasticating capability Pressure gradient Reciprocating extrusion velocity distribution Screw channel Vibration force field (VFF) |
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