Temperature control | processing
develop a system able to vary the capacity from 20 to 100%, and to develop a cooling generator made by different units in order to achieve high modularity.” Renato Moretto notes that, for numerous reasons,
cooling channels are getting tighter, the complexity of moulds is increasing, the heat exchange surface is smaller to reduce the mass to be thermo-regulated, and pushing the liquid inside these tight cavities requires more pressure – which means more energy. “Furthermore, it is increasingly necessary to
thermo-regulate moulds for zones at different tem- peratures to optimise the injection phase. Pressure, flow rate, heating temperature, and cooling capacity should be managed zone by zone to achieve the maximum result in terms of energy and production efficiency.” Moretto has developed a modular system so that
flow rates and pressures can be made suitable for each application. Pressures up to 7 bar for moulds with narrower passages are possible, and flow rates of up to 100 litres/min. “Intelligent unit management can be done at the highest level with the help of digital electronics, and mechanical, hydraulic and electrical modularity,” says Renato Moretto. “Our X Max Cooler and X Max TE-KO temperature control units are projects that look to the future. “We can finally connect all the machines to a
centralised control, delivering electronic intelligence management that will contribute to the building of the intelligent factory.”
Blowing hot and cold Miriam Olivi is sales director at Frigosystem Corema. She says: “New moulding technologies combined with the construction of more complex moulds and the use of high performance polymers require more accurate control of the working temperature, flow and pressure in the production processes. Frigosystem has HC thermo-refrigerating units suitable to meet these modern needs of production.” She claims that “both for characteristics and technical solutions, these units represent the most advanced temperature control system for moulds currently present in the market.” The new HC unit is a combination of the Frigosystem RACA C chiller and its TRW TCUs. Within each HC unit there is a
water cooled chiller with reservoir tank and each of the one, two or three process circuits are further equipped with
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a proportional three-way valve and heater. By controlling the mix of chilled and recycled water this arrangement ensures that each of these independent process circuits is able to maintain its own working temperature within the range -10°C through to +90°C with a typical accuracy of +/- 0.5°C. Compact air cooled versions are also available. Energy savings are top of
the list of benefits to the user, Olivi says. The water cooled version is normally connected to the existing cool water circuit, either a conventional cooling tower or the Frigosystem range of dry coolers or adiabatic dry coolers. “This arrange- ment will provide for free cooling for a number of months throughout the year,” Olivi says. “This could mean several months of chilled water without once starting the chiller compressor.” A range of models are available but these units are usually tailored exactly to customer requirements.
More safety in production Wittmann Tempro basic C120 temperature controllers with direct cooling are now available with new software features, which the company says “will make an even more effective contribution to improving safety in production.” These temperature controllers can operate at
temperatures of up to 120°C and are used wherever a high cooling performance is required. Rather than have the cooling water used indirectly, flowing through a cooling coil, the water inlet is connected directly to the heat exchanger. This means that the operating tem- perature of the appliance depends indirectly on the water inlet pressure. Previously, the minimum inlet
pressure (2 bar) and the highest permissible temperature of 120°C were linked in temperature controllers with direct cooling laid out for 120°C. The consequence was that the appliances could not be operated at a water inlet pressure below that minimum. In such cases, the pressure setting had to be adjusted to the actual conditions manually via the appliance’s display.
Above: Wittmann’s
Tempro basic C120 single- circuit tem- perature controller
Left: The new HC unit is a combination of Frigosystem’s RACA C chiller and its TRW TCUs
July/August 2017 | INJECTION WORLD 21
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