The Study of Micro-Injection Molding of Thin-wall Light Guide Plate with Hemispherical Micro structures

摘要

Micro injection molding is widely used due to it's high accuracy, high production efficiency, low cost and the ability to fabricate products with complex structures. For thin-wall and large area parts, it is difficult to fill the cavity with micro structure. The light guide plate is a typical product. In this paper, the filling process of the light guide plate (LGP) with micro structures on the surface is studied. And the warpage of the LGP is analyzed, which affects the optical performance remarkably. Orthogonal method is used to analyze the filling process and the wrapage. The most important factor that affects the filling process and the wrapage is the injection pressure. The levels of the different process parameters on filling process are injection pressure, melt temperature, mold temperature, injection speed and packing pressure. For warpage, the sequence of the effect is injection pressure, mold temperature, packing pressure, melt temperature and injection speed.