Patent ID: 7021923

Claim:
An injection molding system adapted for communication with a source of pressurized molten plastic to form molded plastic parts, said injection molding system comprising: a die including a pair of die halves supported for movement toward each other so as to mate along opposed cooperating joining surfaces to form a mold parting line, said die halves cooperating to define a mold cavity in which the molten plastic cools to form a molded part and a runner adapted to direct molten plastic toward said mold cavity, said die halves being further moveable away from each other to open said mold cavity and to eject the finish molded part; a plurality of ejection pins supported in at least one of said halves of said die, said ejection pins operable to move the finished molded part in a direction away from at least one of said die halves; and a gate removably mounted to one of said die halves, said gate including an inlet in fluid communication with said runner, an outlet in fluid communication with said mold cavity and a gate flow passage disposed therebetween that tapers inwardly from said inlet to said outlet, said outlet defining at least one edge surface extending in a direction generally opposite to the movement of the molded part upon ejection from said mold cavity, wherein said edge surface of said outlet forms an acute angle relative to said gate flow passage to define a shearing edge point operable to separate the finished molded part from cooled excess material formed at said gate and said ejection pins are further operable to remove cooled excess material from said gate and said runner upon separation of said die halves.