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Press release
02.08.2017  |  9947x
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Lödige at Powtech 2017

Tablet coater in a new design

At Powtech, Gebrüder Lödige Maschinenbau GmbH will be showcasing a series of innovations in the field of coating technology for the pharmaceutical industry. The LC series of coaters, specially conceived for coating tablets, has been the subject of extensive redesign. For example, a newly configured airflow now provides a significant boost in efficiency and availability of the machines. Advanced sensors facilitate optimization of the spraying and drying process, and simple and safe adjustment of the nozzle arm makes handling easier. The latest member of the LC coater family will also be exhibited at the trade fair booth: the LC Lab was specially developed for use in the laboratory.

With the newly configured air flow, Lödige has significantly increased the throughput capacity for tablet coating. In contrast to the previous forced air feed via an intake boot, the air to the LC series of coaters flows through an air injection manifold over a large circumference of the coater drum in the direction of the tablet bed. This enables even, largely turbulence-free entry of a large a volume of drying air into the drum. The innovative concept ensures a high drying capacity and hence high spraying rates. The undesirable effect of spray drying, resulting in spraying losses during coating, is effectively prevented. This not only extends the intervals between the cleaning procedures; it also significantly reduces cleaning effort. If cleaning is necessary, this can usually be carried out simply and economically, even in the case of highly effective products, with an integrated WIP or CIP system.

Reliable thanks to new sensors

Accurate spacing of the nozzles from the tablet bed is critical for optimum spraying results. To accomplish this reliably and simply, the LC series of coaters was equipped with new features: a laser distance sensor carries out the required measurement. The nozzle is subsequently adjusted from the outside by means of a hand wheel. Thus, the operator is – in contrast to previous solutions – not required to reach into the coater. As an option, distance measurement and adjustment can be performed fully automatically. The correct distance is thus adhered to during the entire spraying phase.

When it comes to product temperature, Lödige sets great store by precision. Normally, it is determined by exhaust air temperature; however, the latter responds rather sluggishly. Due to the high relevance of product temperature for the drying process, the Paderborn experts opted for an additional solution. An infrared sensor takes a measurement directly beneath the spraying zone. Precise measurement guarantees that the film-coated tablets do not cool down during the spraying phase.

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