Deflashing design rules and its impact towards package quality

In semiconductor industry, deflashing is one of the important process steps during manufacturing of the semiconductor product. The term `deflashing' is used to describe the removal of excessive mold bleed and resin bleed as a result of molding process in the assembly of the plastic devices as shown in figure 1. Mold bleed is black color material and is due to leakage while resin bleed is transparent / light yellowish-brown color and is due to separation of the epoxy resin from the fillers.