Why and how to prevent glass fiber rich surface in injection molding
When the mold was tested, sometimes the product had a serious appearance quality problem with radial white marks appeared on the surface. The white marks tended to be serious with the increase of the glass fiber content. This is known as " glass emergence on the surface(also glass fiber rich surface )" which is a surface defect most likely on the glass fiber plastic products, which is unacceptable for automotive plastic parts with high appearance requirements. [caption id="attachment_3913" align="aligncenter" width="3200"] glass fibre rich surface[/caption] Cause The glass fiber rich surface is caused by the exposure of glass fiber. The white glass fiber appears on the surface during the plastic melt filling and molding. After condensation and molding, radial white marks are formed on the surface of the plastic part. When the plastic part is black ,it will become more obvious as the color difference increases. There are several reasons b...