玻璃包边, 嵌件塑件, 注射成形, 热传递, PVC固化焓变

In the injection molding process of wrapped plastic in vehicle safe glass, the flaws always appear in the surface and the plastic may fall off from the glass because of the untight adhesion. The heat transport phenomenon was analyzed in the injection molding of wrapped plastic. First, a simplified model and the equations of heat transfer from the cavity to glass and mold walls were set up. Then the temperature curves from filling to the ejection of plastic were obtained by experiments. The results show that the temperature distribution of the plastic surfaces, moveable mold and stationary mold is different somewhat in time domain, with temperature rising in small amplitude. The enthalpy of the molding process of wrapping plastic calculated by the heat transfer model show that the temperature rising delay is in coincidence with the enthalpy distribution. This heat transfer analysis discloses the mechanism that the wrapped plastic fall off from the mold and surround the glass tightly, which can be used as the reference for the mold structure design and processing design.

glass wrapped with plastic, plastic with insert, injection molding, heat transfer, PVC solidification enthalpy