Hot Runner and Cold Runner Systems for Injection Plastic Mold Are Introduced

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Hot Runner and Cold Runner Systems for Injection Plastic Mold Are Introduced

Posted By Jin hong     May 13, 2021    

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The use of hot runner systems in Injection plastic mold has been possible for nearly 50 years, but it’s only since the late 1990s that the use of a hot runner system surpassed cold runner systems in plastic injection molding.

Hot Runner and Cold Runner Systems
In a hot runner system, a manifold system heats the mold tool and sends melted plastic to nozzles which deliver the plastic to various cavities within the mold. Hot runner systems may be either internally or externally heated. External hot runner systems are excellent for use with polymers that may be sensitive to temperature fluctuations, but internally heated systems offer better flow control.

In a cold runner system, the plastic injection occurs through the sprue. The plastic fills the runners leading to the cavity. Both hot and cold runner systems have advantages and disadvantages that may make one system more applicable to a certain plastic injection molding use case. Here’s a look at the pros and cons of each.

The Straight ejector pin is also our hot product, you can click to view.

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