TITANIUM DIOXIDE | MATERIALS
Mixing it up Zeppelin Systems used K2022 to show systems that improve the mixing of titanium dioxide (TiO2) into compounds and masterbatches. It said this is one of the more difficult polymer sector applications because – since October 2021 – TiO2 has been classified within the EU as a carcinogen if inhaled on its own or in mixtures where the substance or mixture contains 1% or more of TiO2 particles smaller than 10 microns. It cites the example of a company wanting to
produce a white PVC compound for window profiles. Due to the processing method in heating/ cooling mixers, the TiO2 has to be metered into the mixer in powder form. This is the only way to generate a bond to the PVC grain in the process of hot mixing at temperatures of up to 130°C. After cooling to a storage temperature of 40-50°C for silo storage, the pigment has completely attached itself to the plastic particles – which are now significantly larger, at 100-300 microns – and exposure to free TiO2 powder is prevented. TiO2 pigments have a particle size of 0.01 to 1
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 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 said. “In combination with the BVD and BVC jet filters, they ensure good dehumidification of the mix while withstanding the pressure fluctuations, high temperatures and chemical stresses occurring in the process.” Zeppelin says its CMQ container mixer also allows users to work in dust-free conditions – help- ing processors benefit from efficient mixing, low temperature rises and cleanability. “The dust cloud that remains in the free space of
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Zeppelin’s Flex-line heating/cooling mixer combi-
nation is said to be well suited to demanding tasks such as processing of titanium dioxide
the mixing container is effectively aspirated before undocking,” it says. It adds that a sealing system between the container and mixing plate prevents dust from escaping. This reduces the excess pressure, and the remaining dust is 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. The wide area aspiration – and an additional intake of external air via a filter system – enables an efficient air exchange, it 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.
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