Types Of Runner In Injection Mould



Based on molten plastic Feeding System injection Moulds can be classified in two Categories:
  • Cold Runner Mould

  • Hot Runner Mould

Types Of Runner In Injection Mould (Mold)
Types Of Runner In Injection Mould




Understanding the differences between these technologies can help you have a more productive and informed discussion with your plastic injection specialist to determine the most feasible option for your unique application.

  • Cold Runner Mould :

In a Cold Runner Mould, the runner is cooled and ejected with the part. Every cycle, a part and a runner are produced. After the complete cycle runner is removed from injection Moulded part.

 In this runner system is a unheated physical channel that is used to direct molten plastic into injection Mould tool cavity after it leaves the nozzle.

 The obvious disadvantage of this system is the waste plastic generated. The runners are either disposed of, or reground and reprocessed with the original material. This adds a step in the Mould Manufacturing process. Also, regrind will increase variation in the injection Moulding process, and could
decrease the plastic's mechanical properties.
  • Hot Runner Mould 


In a Hot Runner Mould, the runner is situated internally in the Mould and kept a temperature above the melting point of the plastic.

In this runner system is a heated physical channel that is used to direct molten plastic into a injection Mould tool cavity after it leaves the nozzle.

 In this system, runner is part of injection Mould. Runner temperature is kept above plastic melting point. Runner scrap is reduced or eliminated. The major disadvantages of a hot runner is that it is much more expensive than a cold runner, it requires costly maintenance, and requires more skill to operate. Color changes with hot runner Moulds can be difficult, since it is virtually impossible to remove all of the plastic from an internal runner system.

 Hot runners have many advantages. They can completely eliminate runner scrap, so there are no runners to sort from the parts, and no runners to throw away or regrind and remix into the original material. Hot runners are popular in high production parts, especially with a lot of cavities.




Check Out:
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Injection Mould Elements
Types Of Injection Mould

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