Optimal Design of Barrier Screws with Fluted Mixing Element for Metallocene Polyethylene

• Main Author: 鄭智介
• Other Authors: Jiann-Shing Wu
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/67393965190894647864

碩士 === 國立交通大學 === 應用化學系 === 91 === Computer simulation combined Taguchi method is used in optimal design of barrier flight geometry with m-PE as our processing material. For the barrier flight section, finite difference method based on the Tadmor melting model was utilized. However, flow analysis network was used to analyze the mixing element. In this study,「SN」ratio was used as our standard .However it is very simple and convenient. The bigger one is good. Then we search the optimal geometry of barrier flight with output rate, screw pressure, and temperature difference between last channel section and barrel with SN ratio. Subsequently, the effect of processing conditions on the screw performance, such as solid bed velocity, melt film thickness, melting rate per unit length, output rate, pressure build-up, temperature difference of last channel section and bulk temperature were discussed. In addition, pressure build-up in barrier flight with mixing element were also studied. In further, Searching the optimal geometry in mixing element.