A theoretical study with non-Newtonian fluid model was conducted on the per formance of the Maddock mixing head(MMH) in plasticating single-screw extrusion. In this study, the flow analysis network(FAN) method with the corresponding viscosity, so called, the equivalent non-Newtonian viscosity was used for the prediction of pressure variation in both the down-channel and cross-channel direction of MMH. And for the experimental study, the published data were used. Two kinds of screws with the MMH were used, namely:one screw (exp.# 28 similar to 36) to measure the pressure difference between the entrance and the exit of the mixing head in the down-channel direction and the other screw (exp.# 40 similar to 49) to measure pressure variations in the cross-channel direction in the middle of the mixing head. In this study we tried it by using the parameter h(1). The equivalent non-Newtonian viscosity of power law model with drag now was used to simulate the experimental results. This study made the progress on the agreements between experimental results and theoretical predictions.

단축성형 압출기에서의 Haddock mixing head (MMH)의 성능에 대하여 non-Newtonian fluid model에 대한 이론적 연구가 수행되었다. 본 연구에는 점도와 관련된 flow analysis network (FAN) 방법, 즉 Newtonian 대응점도가 MMH down-channel과 cross-channel 방향에서의 압력변화를 예상하는데 사용되었고, 실험적 비교로는 MMH를 가진 두 개의 스크류를 사용하여 실험하여 출간된 데이터를 사용하였다. 즉, 하나 (실험 #28∼36)는 down-channel 방향으로 mixing head 입구와 출구에서의 압력 차이를 측정하기 위한 것이고, 다른 하나 (실험 #40∼49)는 mixing head 중간에서 cross-channel 방향으로 압력 변화를 측정하기 위한 것이었다. 본 연구에서는 h_l의 변수를 도입하여 power law model의 Newtonian 대응점도를 이용하여 실험결과를 모사하였다. 본 연구를 통하여 실험결과와 이론적 모사와의 차이를 한층 감소시킬 수 있었다.

Keywords: Maddock Mixing Head (MMH); Fan; Equivalent Non-Newtonian Viscosity