processing | Continuous and batch mixers for PVC
Right: The C tec PRO system demonstrated at K2016 by MTI is due for delivery to Clariant for masterbatch production in early 2017
systems, the low density fibres provide a greater challenge for heating and then, once the polymer melts, much more torque is needed to mix everything together. Installed power is therefore around twice as high as on units for PVC. In addition, much better aspiration is needed to remove moisture. The new unit is said to be capable of reducing water content down to below 0.1% and possibly as low as 0.05%.
Critical for colour Stephan Poller, General Manager for Zeppelin Systems’ Mixing Technology business, which produces Henschel- Mixers, also emphasises the need for increasing up-time in mixing operations. He says the company has in recent times been focusing on the use of its latest CMS container in mixer colour mixing, where the ability to clean equipment to get it back into operation quickly is critical (cleaning can often take much longer than mixing). For this reason, the company will launch a new design at the beginning of this year incorporating changes to both the mixing head and mixing tool to make it easier to clean and maintain. For example, material build-up on the mixing tool should be almost eliminated in the new design, Poller claims. In addition, the mixing head will be much easier to clean than in current models. And with many products sensitive to high temperatures, thermal control is also being improved. “You want mixing to be as intense as possible, at the lowest temperature rise possible for the most gentle material treatment and in order to minimise material build-up in the mixer,” Poller says. Zeppelin’s Henschel-Mixer series MB for sensitive
materials that require particularly accurate tempera- ture control is now available with an increased number of cooling circuits so that the temperature can be varied across the various cooling zones: in the mixing bowl
itself, the shaft, and the mixing tool. The mixing bowl can also be both heated and cooled. The company says this increased zoning is complemented by improved energy data acquisition and control loops on tool speed, water temperature, and other process variables and consumers. Turning to the company’s FM high intensity mixer,
Poller says the company has developed numerous new features to make it easier to clean. These include the Henschel Transformer Cleaning package, which comprises a three-piece mixing bowl design with hydraulic lifting units.
Optimised performance Italian firm Caccia Engineering highlights energy savings on its latest equipment. It says that savings of up to 30% are possible with the latest turbomixers equipped with sensor-less vector motor inverters, together with specific software and other unspecified advanced devices. According to a company representative, the main
Right: The CPeX laboratory continuous mixing system from Farrel Pomini is said to be designed for develop- ment of challenging product formulations
32 PIPE & PROFILE EXTRUSION | January/February 2017
innovation on the turbomixer design is a special thermo-refractory material applied on the container. This material, which Caccia calls TermoShield, has been developed for this type of machine to allow improved heat generation and retention during the homogenising process. Plasmec says it has received a lot of interest in its
newly optimised cooling mixers. The company claims that it is now “a straightforward task” to cool over eight batches per hour of U-PVC down from 120°C to 40°C. Redesigned water circuitry increases cooling efficiency, “enabling a significant increase in the productivity of the cooler and, therefore, the mixing plant.” According to
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