平面式螺旋模头之流动分析与可视化研究FLOWANALYSIS.PDF

螺 流 FLOW ANALYSIS AND VISUALISATION FOR THE PLANAR SPIRAL EXTRUSION DIE Huang Chung-Ching Chen Ming-Da Shih Han-Shen 立 螺 利螺 流 流 了料 料度 螺 兩螺 螺 螺 行 流流:流量度 (UI) 力(PD) 度(MD) 來流 (G) 螺 度(H) 螺 數 (A) 螺 度( ) 螺 (G=0.1959mm H=7.32mm A=0.1115 =1.4434 )流 行流 不 行流不螺 論不 度不 流量流 螺 Abstract The function of spiral mandrel die is mainly use for extrusion polymer pipes or thin films the advantage of the process is to mix the flow of polymer melts inside the die well to solve the melting line and also enhance the strength .The spiral die could divide into mandrel and planar type. This study is mainly to investigated the flow distribution in planar spiral dies. The feature of die has eight helical grooves cut on the planar surface. Proper groove design can produce the beautiful and durable products. In this study we analyze through Lumped Parameter Method applied over a finite number of control volumeand associated with the Taguchi approach is applied to search several sets of die geometric parameters such as initial gap of dieinitial depth of spiral channeltaper angle and converge constant of spiralfrom which process the flow uniformitymixing degree and total pressure dropfinallythe optimal geometry of the die was determined. Sequentiallythe performance of the die with a glass window is developed to observe the flow distribution by digital videoand the images are cut out of for observe the mixing degree of the two 1 polymers by Optical Microscopy. The effect of initial gap of die on the mixing degree of the two polymers is investigatedthree initial gap of die 0.20.40.6mm were selected. Finallythe effect of the mold temperature and