Cold Runner Mold
BMJ Mold and Engineering builds high-quality cold runner molds used in manufacturing injection molded plastic parts.
Cold runner molding is an economical solution:
- To produce plastic parts of simple design
- When more than one color part is needed to be produced
Cold Runner Molding: Efficient and Economical
Significant advantages to using a cold runner system include:
- Simple mold design
- Considerably less expensive than hot runner system
- Less skill required to set up and operate
- Mold requires less maintenance
- Easy color changes - all plastic in the mold is ejected with each cycle
With a cold runner mold, the runner (excess material retained in the feed channels) is cooled and ejected with the part. Every cycle, a part and a runner are produced.
Learn more: Choosing the Correct Molding System
Cold Runner Molding: A Few Disadvantages to Consider
While it is a less expensive process than hot runner systems, there are a few disadvantages to cold runner systems to consider, including:
- Waste plastic generated
- Runner material must be disposed of or reground and reprocessed
- Additional steps in the manufacturing process
- Regrind increases variations in the injection molding process
- Regrinding could decrease the plastic's strength and mechanical properties
Cold Runner Molding: Get the Right Mold for Your Project
Cold runner molds are the least expensive to build for parts of simple design.
Depending on part complexity, one of two types of cold runner molds may be used:
- A two plate cold runner mold is the easiest and least expensive type of mold to produce
- Two plate molds have a single parting plane, and the mold splits into two halves at the plane
- Because the runner system must be in line with the parting plane, the part can only be gated on its perimeter
- A three plate cold runner mold differs from a two plate mold in that:
- Three plate mold has two parting planes
- Mold splits into three sections each time a part is ejected
- Provides greater flexibility of design - allows gating to be placed in the most efficient locations
- Two parting planes allow for easier plate separation; runner system can be located on one, and the part on the other
For a quote or more information about how we can help your project, call 765-457-1166, or send us an email, or submit this short form:
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