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The use of liquid carbon dioxide or nitrogen for internal cooling gives much more efficient heat transfer compared to cooled air.
The cryogenic is injected into the blown part, followed by vaporisation inside the hollow part. The coolant is than exhaused as hot gas through the blow pin exhaust.
The method increases productivity through more effective utilisation of machines and quality of the produced article. The dimensional stability of the moulded part is improved as the cooling of the polymer is controlled.
The method is most suitable for cooling of thick-walled parts with long cycle and cooling times. |
