Injection Mold Making » runner http://imoldmaking.com Illustrated guide for mold makers Fri, 06 Aug 2010 23:42:29 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 Injection Mold Sprue and Runner http://imoldmaking.com/runner-and-gate/injection-mold-sprue-and-runner/ http://imoldmaking.com/runner-and-gate/injection-mold-sprue-and-runner/#comments Thu, 31 Jan 2008 22:27:03 +0000 Elito http://imoldmaking.com/?p=20 Continue reading →]]> sprue-runner-gate

This will describe the sprue and runner system of molds.

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Sprue

A sprue is a channel through which a molten plastic material is being injected from the nozzle of the injection machine into the mold. It has a smooth, round, tapered wall to allow smooth material flow.

Runner System

Runners are channels where material flows from the sprue to the cavities.

Conventional Runner:

conventional-runner

Improved Runner:

improved-runner

Balanced Runner: Resin is evenly distributed throughout the cavities. Volume and condition is the same. There is more material used because the total runner length is longer compared to the other two.

balanced-runner

Hot Runners:

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