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Table of contents
There are a number of factors to consider when designing the feed system, including the gate locations, the number of cavities, the shape of the runner system components, and flow balance.
The first step in designing the feed system is to determine the gate locations for each part in the mold. The rest of the components will fit into place depending upon each gate location. The objective when designing the feed system is to design it with balanced flow so that each part in the mold fills at the same rate. The creation of a well-balanced feed system requires careful consideration the following elements:
- Single-cavity, multi-cavity, or family mold
- Cavity layout
- Location of the sprue
- Runner system layout
- Shape of the sprue, runners, and gates
In general, make runners as short as possible, with the lowest possible shot weight. In the following diagram, the flow length for every part is the same. This is a naturally balanced runner system.
Topics in this section
- Feed system (Procedure)
There are a number of factors to consider when designing the feed system, including the gate locations, the number of cavities, the shape of the runner system components, and flow balance.
- Part/runner combinations
The following describe the most commonly used part/runner combinations in an injection molding machine.
- Selecting the number of cavities
A number of factors should be considered when deciding how many cavities can be filled from a runner system.
- Runner System Wizard
The Runner System Wizard enables you to define basic runners, sprues, and gates, to quickly produce a complete feed system.
- Occurrence numbers
Occurrence numbers are typically used to simplify the amount of modeling required for a Fill+Pack analysis by specifying the number of times that a given flow path is repeated in a multiple cavity tool.
- Sprue
The sprue is the extension of the injection nozzle into the mold.
- Gates
Gates connect the runner system to the cavity and are the orifices through which the melt enters the mold.
- Runners
The runners are the feed channels that connect the sprue to the gates. The design of the runners is important to ensure even filling of the cavities.