Insulated hot runner
From Plastics Wiki, free encyclopedia
Insulated runner molds have oversized passages formed in the mold plate. The passages are of sufficient size that, under conditions of operation, the insulated effect of the plastic (frozen on the runner wall) combined with the heat applied with each shot maintains an open, molten flow path.
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Advantages
- Less complicated design.
- Less costly to build.
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Disadvantages
- Undesired freeze-up at the gate.
- Requires fast cycle to maintain melt state.
- Long start-up periods to stabilize melt temperature.
- Problems in uniform mold filling.
