Secondary Runner
A runner system located between the main runner and the molded part.
![[Secondary Runner graphic]](graphics/2runner.gif)
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
- Secondary Runner
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RTP Company • 580 East Front Street • Winona, MN, 55987, USA
Internet www.rtpcompany.com • E-mail rtp@rtpcompany.com
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