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10-17-2016

Injection Molding in Economy Mode

Temperature-Control Units with Variable-Speed Pump

Thermo-5 temperature control circuits with ­variable-speed pump are only 7 cm longer compared to standard sizes (© HB-Therm)

What pump is right for my temperature-control unit? The answer is not trivial, since injection molding makes such diverse demands, particularly on units for universal use, that, until now, there has not been any single pump that is suitable. With constant-speed pumps, for physical reasons there is no efficient solution that satisfies both applications with large runner cross-sections and those with small cross-sections. The logical response is therefore, by controlling the pump speed, to adapt the characteristic curve in such a way as to achieve the desired flow rate with minimum energy expenditure.

The flow conditions in the cooling channel, and therefore the quality of heat transfer from the heat-exchange fluid to the injection mold, are determined by the flow rate as a function of the channel cross-section. If the flow rate is too low, a lower drive performance is needed, however the heat transfer and temperature distribution in the mold are poor. If the flow rate is increased, the heat transfer is only slightly improved, but the necessary drive performance increases disproportionately.

Operators now have access to effective support in choosing the right pump speed with the Thermo 5 temperature control units from HB Therm AG, St. Gallen, Switzerland. In eco mode, the unit itself determines the flow rate necessary for the application, thereby enabling energy savings (marked with a green leaf on the display), without risking the process stability. Moreover, suitable interfaces are provided for integrating the new units into process systems, so that their speed can be varied by means of the superimposed flow control. This kind of actuation is most suitable for applications with flow-controlled temperature-control circuits connected in parallel.

Company profile

HB THERM AG

Spinnereistr. 10 WU3
CH 9006 ST. GALLEN
Tel.: +41 71 2436530
Fax: +41 71 2436418

HB-THERM GmbH

Dammstr. 70-80
DE 53721 Siegburg

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