All melt channels together are called runner or runner system.
For these names, there is no distinction between hot and cold runner.
A good runner is responsible for a balanced filling of the cavity and less material and pressure loss.
![Runner system in Plastic Industry Runner system in Injection Molding](https://www.plexpert.ca/wp-content/uploads/2020/10/Verteilersystem.png)
The runner system can contain a combination of hot and cold runner or only one of the two components.
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.