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Precisely engineered carbon dioxide (CO2) (or nitrogen) spot-cooling systems can help substantially reduce the cost of injection-molded parts, or inexpensively add injection-molding capacity without major modifications. CO2 spot cooling helps achieve more uniform cooling across the part geometry, critical for injection-molded parts quality, mold-release performance, and reduced cycle times. In fact, as developed by Linde with manufacturers around the world, CO2 spot cooling has been shown in some cases to cut cycle times by up to 50 percent.

Liquid CO2 Hits the Hot Spot
CO2 spot cooling puts cryogenic cooling to work just where it is needed to cool mold hot spots. Spot cooling supplements current water systems to reach surfaces of the mold or areas of the melt that cannot be adequately cooled by water cooling methods. This includes thicker areas of the mold or other areas where materials accumulate, as well as mold recesses at the furthest reaches from the melt injection point.

Production Ramp-up Troubleshooting and Retrofit
Because of its flexibility, Linde CO2 spot cooling can be an excellent retrofit solution during production ramp-up, and may even help avoid a major mold modification or redesign. CO2 is also used to cool injection molded parts with hollow cores from the inside in a process called CO2 “inner cooling,” patented by Linde. Inner cooling is an Enhanced Gas Assist Injection Molding (or eGAIM) process.

To troubleshoot molding issues and meet a range of needs, Linde can perform a thermal analysis of existing molds, calculate CO2 consumption, design and engineer CO2 cooling, and provide support for demos and system start-up.

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