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In this work, the adhesion strength of insert molding with two types of joint geometry is studied. The material used is Acrylonitrile Butadiene Styrene (ABS) and the main different of the joint geometry are the contact angles, which are 90°and 75°, respectively. The specimen dimension is designed according to the ASTM-D25 Standard. The influence of injection parameters such as injection speed, holding pressure, holding time, etc. on the adhesion strength of insert molding are investigated through the Taguchi method. In addition, the effects of the different factors are also studied by ANOVA approach. In order to examine the influence of the melt viscosity variation in injection molding, a pressure sensor is installed in the cavity to calculate the melt viscosity by the injection pressure data. The data shows that a higher mold temperature can enhance the adhesion strength for both contact angles but only a higher injection speed is good for the 90 ° contact angle of joint geometry. The experiment for investigating the influence of different melt viscosities on the adhesion strength of insert molding is also implemented. The result also agree that the previous result calculated by Taguchi method. Keywords:insert
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