Mold temperature control – carbon dioxide cooling
Cooling in Three Seconds
Hofmann Werkzeugbau, a member of Hofmann Innovation Group AG in Lichtenfels, Germany, has developed a completely new type of mold temperature control – carbon dioxide (CO2 ) cooling – in cooperation with the also Lichtenfels-based Riessner-Gase GmbH & Co. KG. The development was based on a requirement for cooling channel diameters of less than 3 mm.
Until now, mold temperature control has been based on fluids such as water or oil flowing through cooling channel diameters larger than 3 mm. Cooling channel diameters less than this value presented moldmakers with difficulties when liquids were used for mold temperature control. The use of CO2 provides an alternative. With this approach, liquid CO2 is introduced into a bubbler via a capillary tube; it expands and cools the surrounding significantly. Working together with its development partner, the company has succeeded in cooling even very long channels uniformly with CO2 . It is currently possible to reduce the cooling channel diameter to 1.5 mm. The cooling rates attained are high. For instance, a test plaque was cooled from 72°C to 27°C in three seconds, a temperature difference of 45 K. A further benefit of the system is that the CO2 temperatures can be set exactly to values between -50°C and +30°C.
HOFMANN Innovation Group AG
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