on 02/25/2015

Special Prize
Synventive Molding Solutions
Using Moldex3D to Simulate Synventive’s activeGate™ Technologies

With large injection molded parts, it is common to use a multiple drop hot runner system. Also common with this type of part is to use sequential filling as to eliminate weld lines. However, when molders use sequentially valve gates, there is a possibility that some common defects will occur. These defects are pressure transition marks on unpainted parts, reflection marks after a paint drying process and hot spot marks opposite of a direct gated nozzle. These defects are a result of a change in pressures and the fact that polymer melt is compressible.

In this project, two analyses were conducted. The first analysis was done with standard sequential valve gating and was designed to see if the simulation can help identify the problem areas. The second simulation was also sequenced, but opening strokes of the delayed pins were controlled. The purpose of the second analysis was to find out if the simulation can help validate the activeGate controls. With Moldex3D simulations, Synventive were able to identify molded parts that could potentially have defects, which would cost time and money, before the tool is ever machined. Additionally, the ability to simulate the advanced pin control allowed Synventive to alter the characteristics of the fill and possibly eliminated any defects found in the injection molded part.


  • Enabled pin movement simulation to identify defects that can be eliminated by activeGate controls
  • Early detection of common defects in injection molded parts
  • Saves molders time and money by scrapping less parts

Software used:

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