machinery feature | Mixers
Henschel’s HCE 1700 cooling mixer can
handle as many as 12 separate 220 kg batches per hour
“hot” dry-blend, since the bonding of the additives to the PVC resin is limited. The double-batch process is mostly used in the manufacturing of compounds for PVC pipes.
At K2013, the Henschel Mixing Technology division
of Zeppelin Reimelt was exhibiting its FM 500/HCE 1700, the high-intensity mixer-cooler combination that it launched last year. It says that the series, intended principally for rigid PVC, is characterized by very high outputs and low energy consumption. The FM 500 high intensity mixer uses a new tool blade which is belt-driven by a 160 kW motor with an IE 3 energy classifi cation according to EN-60034-30; this signifi es 96% effi ciency. The newly revised HCE 1700 horizontal cooler mixer has been integrated in a frame to improve the torsion stiffness and provide easier access for maintenance. The stainless steel cooling jacket can stand a pressure of 7 bar, rather than the 1-2 bar normally possible with cooling mixers. The company says that its design helps to provide an excellent turbulent cooling stream. Jörg Brandau, head of after-sales service, adds that this means the mixer can accept materials up to 30°C hotter than normal, resulting in a considerable improvement in throughput. The HCE is capable of as many as 12 batches per hour, each of 220 kg, he says. “In the past, the heater had to wait for the cooler; that is no longer the case.” Henschel says that, compared with a standard machine producing 7.5 batches per hour with 220 kg/ batch, energy input required per tonne comes down from 80 kW to 71 kW. Cooling water consumption is changed proportionally. Thanks to the incorporation of a new cooled rotating mixing tool, the effective cooling surface inside the
The PLC in Henschel’s FM high intensity mixer runs the motor throughout the process at the nominal torque and nominal current. The speed is adjusted according to the torque infl uenced by the material behaviour, which achieves the shortest batch times and prolongs the machine’s lifetime
56 COMPOUNDING WORLD | November 2013
mixer is 25 % more than the standard confi guration, according to the company. It also says that, because of the well balanced radial/axial working tool paddles, the material circulation and the contact with the cooling surface has been improved signifi cantly. The ratio of bowl geometry and tool allows for very short feeding and discharging times. A further enhancement has been realised by the eccentric movement of the shaft to ensure a very minor residual material after discharging. Andreas Backhaus, sales manager for Mixaco mixers, says that the company is innovating to reduce energy consumption. Its Revolution cooling mixer can be used for various mixing and homogenizing tasks, but its principal target area is, once again, PVC. Character- ized by high energy savings and very high throughput, it looks quite unlike most other equipment intended for the same job.
Normally, higher outputs in cooling mixers are
achieved by the relatively simple process of upsizing the various components: bigger chamber, bigger blades. But as Backhaus points out, bigger blades are bigger energy consumers. So the Revolution mixer has no blades in the conventional sense. Instead, it has a rotating and tilting chamber, with cooled mixer segments fi xed to its inner surface. There is no central shaft at all, and no unwanted temperature input into the material. As an option, it can be fi tted with a double jacket, which allows precise control of the temperature of the mixing material.
Comparing a traditionally Mixaco mixer with a Revolution with the same output, the Revolution has a power consumption around one quarter that of the
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