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Determining sprue dimensions

Posted by admin on Aug 1st, 2012

General guidelines

The dimensions of the sprue depend primarily on the dimensions of the molded part and especially its wall thickness. Here are some general guidelines you should consider:

The sprue must not freeze before any other cross section. This is necessary to permit sufficient transmission of holding pressure.

The sprue must de-mold easily and reliably.


Figure 1 below illustrates a sprue designed under these guidelines. Use the following formulas to design the sprue. A radius r2 is suggested at the root of the sprue to avoid the sharp corner between the sprue and molding and to facilitate the flow of material.

FIGURE 1. Radius at sprue base improves processing


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