Runners » Why Runners?

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The runner system is the passage way for plastic to travel from the sprue to the gate. The runner system is very important with respect to filling cavities. If the runners are too small in size the mold cavities will not fill properly. If the runners are too large, then the cooling time will be increased and cycle time decreased. Proper runner design can reduce the effects of stress, sink and weld marks.


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Glossary of Terms