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Runner Design

Runner Design

Runner systems convey the melted plastic from the sprue to the gate or part. The most efficient profile for a runner is circular (full-round). A less expensive, yet adequate, profile is a trapezoid, with tapers as shown in the diagram to ensure a good volume-to-surface area ratio. Half rounds are not recommended because of their poor perimeter to area ratio.

Main Runner

A channel that connects the sprue to the gate or part.

Runner

Secondary Runner

A runner system located between the main runner and the molded part.

Secondary runner