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Determining runner dimensions

Posted by admin on Aug 2nd, 2012
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Determining runner dimensions
Factors you’ll need to consider The diameter and length of runners influence flow resistance. The higher the flow resistance in the runner, the higher the pressure drop will be. Reducing flow resistance in runners by increasing the diameter will use more resin material and cause a longer cycle time if the runner has to cool down before ejection. First......Read more

Designing runner cross sections

Posted by admin on Aug 1st, 2012
8887 Views
Designing runner cross sections
Common designs There are several common runner cross-sectional designs. They are illustrated in Figure 1. Full-round runner Trapezoidal runner Modified trapezoidal runner (a combination of round and trapezoidal runner) Half-round runner Rectangular runner Recommended cross-sectional designs The first three runner cross-sectional designs listed above are gen......Read more

Determining sprue dimensions

Posted by admin on Aug 1st, 2012
2486 Views
Determining sprue dimensions
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 reli......Read more