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September 1, 2003

4 Min Read
Mold temperature controls, chillers


The GMC Series oil or water mold temperature controls from Matsui sample temperatures twice every second for continuous feedback and fine-tuned control.

Mokon updated its Duratherm NPS line of mold temperature control systems so that cooling circuit leaks can be temporarily repaired using negative pressure, and production can continue without interruption.

The RSW-145 central chiller from AEC eliminates the use of CFCs for what the company called a completely green unit.

Temperature control for the mold remains a vital cog in the molding process, as processes are fine tuned and maximum precision is necessary. Cooling time is always scrutinized as the largest chunk in the cycle, and mold temperature control equipment suppliers are trying to answer the call with smaller and smaller units that offer more and more accuracy.

  • Central Chillers

    Thermal Care gave its TX Series central chiller a substantial facelift, most notably adding a color touch-screen PLC control that is now standard. The control offers real-time status feedback, a variety of alarms, and a plantwide view that shows cooling towers, chillers, and pumping systems. Ranging from 40 to 206 tons, the chillers with multiple rotary-screw compressors also allow users to leave finger-written messages on the touch screen.

    Mokon brought its new Iceman line of central chillers to the show. The air- or water-cooled units have a capacity range of 30 to 80 tons and single- or multiple-circuit designs to keep centralized process cooling at 20 to 65F.

    AEC took the environment into account with its central chiller, the RSW-145. Described as completely green, the RSW-145 uses no CFCs. If it?s located outside, the unit shuts off if ambient air is cooler than 40F, allowing nature to do the work. It can hook up to as many as three cooling towers and it ranges in capacity from 60 to 195 tons.

  • Control for Optical Disks

    Addressing the exploding market for optical disk molding, both AEC and Thermal Care brought units for that specific market. The AEC Optical Disk TCU controls four distinct zones: moving and stationary mold halves as well as the sprue and the punch. Each zone is individually wired and plumbed so it can be removed and replaced as a single piece.

    Thermal Care?s CRA Series also monitors four zones, and it uses solid-state silicone-controlled rectifiers. There are four pumps for each zone, and the entire unit is constructed from brass and stainless steel to prevent corrosion.

  • Portable Units

    L-R Systems has been working over the last year to add process cooling and heating to its lineup, and it used NPE to debut that new line. The company now has central chillers (20 to 200 tons), pump stations, cooling towers, and water and oil mold temperature control units. L-R also carries portable chillers ranging from 2 to 40 tons.

    Wittmann Inc. built economy into its compact Tempro Primus C temperature control unit, which starts at $1395. With a heating capacity up to 9 kW, the Tempro controls water up to 200F in a 10-by-28-inch footprint. It features negative pressure for safe mold changes and nonferrous plumbing to prevent rust.

    Matsui promises precision with its GMC Series oil or water mold temperature controls. By sampling the temperature twice every second, Matsui says the GMC can maintain optimum production temperatures to within ±.5 deg F. Solid-state relays and stainless steel construction of interior components also make maintenance less of an issue. Units come with two- or four-way manifolds, and there?s an adjustable pressure bypass valve.

    Mokon?s new Duratherm NPS temperature control system temporarily fixes cooling circuit leaks so production isn?t interrupted, reducing repair delays and increasing efficiency. A Venturi jet pump and reservoir pull water through the process rather than push it, but positive or negative pressure can be applied to deal with the presence or absence of leaks.

    Advantage Engineering also put an emphasis on value with its new Sentra VE Series?a 10-kW, 3¼4-hp model that starts at $1295. The 2-hp unit is priced at $1345. The microprocessor control is new as is the cooling valve; all units fit within a 27-by-11-by-16-inch space.

    With a small footprint and a caster-mounted design, Delta T System?s Ice T line of chillers features standard options like microprocessor-based PID control, Nema 1 wiring, and nonferrous piping. A scroll compressor handles refrigeration, and there?s a hot-gas bypass modulation valve.

    Budzar Industries used NPE to introduce newly revamped products, including its portable Mini Temperature Controller (MTC) and its portable Silver Series hot oil units. Nonferrous piping and pumps are now standard on the MTCs along with the choice of direct-injection or closed loop cooling. The Silver Series now run at 600F with flow rates up to 50 gal/min and a heating capacity of 48 kW.

    Opti Temp brought along a mold temperature control system for medical to NPE. The air-cooled water chiller uses scroll compressors, a stainless steel Nema 4 enclosure, and special low-ambient logic controls.

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