Effects of Different feature structures on Fiber Orientation Distribution of Liquid Crystal Polymer (LCP) Material n Injection Molding
Date Issued
2009
Date
2009
Author(s)
Lu, Guan-Nan
Abstract
This study is devoted to investigating the effects of the four basic geometries on the fiber orientation of LCP E130i. The four basic geometries are the flat plate, the arc, the square wave and the battlement respectively. The major injection parameters are mold temperature and injection speed. To discuss the effects of fiber orientation on the warpage, we set two experimental temperature conditions: (1) the injection conditions of 117℃ mold temperature, and (2) 90℃ mold temperature difference between the male mold temperature of 27℃ and the female mold temperature of 117℃. Both of the conditions are operated at four various injection velocities (45mm/s, 90 mm/s, 135mm/s and 180 mm/s) in this experiment. The simulation analysis is also to assist the observation of experimental results. n the experiment of the flat plate, as the mold temperature is 117℃, the fiber orientations are symmetric, and the warpage of the parts are very small in various injection velocities. Under the temperature difference of 90℃, the non-symmetry of the fiber orientation leads to greater warpage. The results prove that the non-symmetry of the fiber orientation and the rate of core layer and part thickness have obvious influence on the warpage.The experimental results show that the distributions of fiber orientation in the arc and the square wave are more non-symmetric than that in the flat plate because of corner effect, and hence a greater warpage, especially in a molding parameter of the temperature difference of 90℃.or the experiment of battlements, the fiber orientations are more non-symmetric because the part has the thickness variance as the mold temperature is 117℃. The warpage of the part decreases in the temperature difference of 90℃. n conclusion, the results prove that adjusting the temperature difference can decrease the warpage when the part has the thickness variance such as the battlements shape. The results can be applied to improve the accuracy of simulation.
Subjects
Fiber orientation
LCP
Injection molding
Type
thesis