A novel online visualization system for observing polymer extrusion foaming |
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| Institution: | 1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, Shandong 250061, China;2. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China;3. School of Mechanical & Vehicle Engineering, Linyi University, Linyi, Shandong 276005, China;1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, Shandong 250061, PR China;2. Qingdao Hisense Mould Co., Ltd., Qingdao, Shandong 266114, PR China |
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| Abstract: | Cell nucleation and premature cell growth in extrusion foaming are critical to elaborate the morphology of final foams. These courses happen in the extrusion die which has been unknown for real extrusion foaming process. In this study, a novel visualization system was developed to online observe the cell nucleation and evolution behavior in the extrusion die. The cell evolution and real time pressure along the flow direction could also be obtained with the system. It was found that the solution pressure Psolution was influential to the critical nucleation radius Rcr and the nucleation rate N0. The higher screw rotating speed corresponded to higher Psolution, lower in die N0 and less premature cells, while higher cell density for extrude foams. In addition, premature cells with radius over critical break radius Rcrb would break into several small cells under sufficient stress gradient in the extrusion flow field. |
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| Keywords: | Extrusion foaming Visualization Nucleation Cell break |
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