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MACHINERY | MIXERS


Right: The Zeppelin CMQ container mixer is designed to be cleaned very quickly


micron. This represents a challenge for dust-free processing, which needs to take place in dust-tight units. Zeppelin says that to process the mix without putting dust into the local atmosphere — and also to dehumidify it for further processing — it combines the mixers with a special aspiration and filter system. “The Vent tec and HMA aspiration systems have


proven their worth here,” the company says. “In combination with the BVD and BVC jet filters, they ensure extremely good dehumidification of the mix while withstanding the pressure fluctuations, high temperatures and chemical stresses occurring in the process.” Zeppelin says they work reliably even with the finest materials to ensure the maximum permis- sible dust content in the clean gas is not exceeded. The CMQ container mixer shown by Zeppelin at K2022 also allows users to work in dust-free conditions. According to the company, processors benefit from the efficient mixing tool, low tempera- ture rise and easy cleanability. “The dust cloud that remains in the free space of the mixing container is effectively aspirated before undocking,” it claims. “A special sealing system between the container and mixing plate prevents dust from escaping and spreading further. This reduces the excess pres- sure, and the remaining dust is quickly and safely extracted over the entire container surface.” The two-stage sealing system initially only opens the mixing chamber to aspiration when the container is undocked, which prevents dust escaping to the outside. The wide area aspiration as well as an additional intake of external air via a filter system enables an efficient air exchange, Zeppelin says. Dust particles are transported “quickly and safely” out of the mixing chamber into a suitable aspiration system; aspiration openings are positioned to avoid cross-contamination. Because the container is a movable mixing


Zeppelin’s Flex-line heating/cooling mixer combination is said to be well suited to demanding tasks such as processing of titanium dioxide


container, the operator can fill and empty it independently. Product remains in the same container throughout the entire process; this rules out the risk of contamination, ensures there is no separation during transport, and allows the batch to be clearly traced. The CMQ is well suited to applications with


frequent recipe changes. The flow-optimised mixing tool is claimed to homogenise extremely effectively while ensuring good dispersion with maximum material movement.


Complementary mix At the end of 2020, Zeppelin Systems acquired MTI Mischtechnik, which had earlier declared insolvency. Zeppelin says the MTI portfolio ideally complements those of its own Mixing Technologies division as the two companies predominantly serve different market segments – both in terms of the focus of their technologies and each company’s global coverage. The MTI portfolio included heating, cooling and universal mixers for plastics processing and chemical applications. “Since the mixer solutions from MTI and Zeppelin are largely used in different industries, the overlap of the portfolio is small,” says Rochus Hofmann, Managing Director of Zeppelin Systems. Family-managed Mixaco — which has test


centres at Neuenrade in Germany and Greer in South Carolina in the US — also designs and manufactures customer-specific mixer solutions alongside its range of standard products for universal mixing processes. At K2022, the company was showing some “tweaks” to existing equipment, as well as some new versions. For example, its i4 vertical container mixer now comes in two sizes in the i4 flex version. The unit was first shown at K2019 and can now accept more container sizes: 300, 450, and 600 l on the smaller version and 800, 1,000, and 1,300 l on the larger version. Both have an automatic system for recognising which size of chamber is coming in, based on rear-mounted limit switches and induction sensors in the shaft, so the


36 COMPOUNDING WORLD | November 2022 www.compoundingworld.com


IMAGE: ZEPPELIN SYSTEMS


IMAGE: ZEPPELIN SYSTEMS


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