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Corona method replaces annealing furnaces
21.05.2013

Faster degreasing of aluminium foil

Aluminium which is almost completely airtight is used in households and industry in order to keep food fresh and warm. For this purpose, a foil thickness of less than 0.007 millimetres – even thinner than a human hair – is already sufficient. In order to achieve this degree of thinness, the aluminium foil is rolled in two layers. To ensure that it does not become stuck, separating grease which is not suitable for consumption is applied.

This layer of grease must be removed before the foil comes into contact with food. To ensure that the separating agent evaporates, the rolled-up aluminium foil has until now been heated in annealing furnaces for up to one hundred hours. The aim is to replace this costly degreasing procedure with a corona treatment. The mechanical engineering company Kampf Schneid- und Wickeltechnik from Wiehl has developed a pilot system. The method is presented in the BINE Projektinfo brochure “Degreasing aluminium foil using corona treatment” (04/2013).

The corona method can be incorporated inline into the production process. After the double foil has been separated, it runs through the corona station. The foil is degreased by an atmospheric air plasma. It runs over an earthed roller above which are high-voltage electrodes. Ions from the plasma come into contact with the foil with a high level of energy. This causes the separating grease to oxidise.

The project is being funded by the German Federal Ministry of Economics and Technology. The BINE Projektinfo brochure, which can be obtained free of charge from the BINE Information Service at FIZ Karlsruhe, is available online at www.bine.info or by calling +49 (0)228 92379-0. Image material is also available for download on this web portal in the press section.

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Faster degreasing of aluminium foil

Das BINE-Projektinfo „Aluminiumfolie entfetten mit Koronabehandlung“ (04/2013)

Minicover
(300 dpi, tiff, 2.9 MB)

Mit den Erkenntnissen aus der ersten Versuchsanlage bauten die Entwickler von Kampf eine Pilotanlage. Die Elektrodenstäbe sorgen für eine gleichmäßige Koronabehandlung über die gesamte Breite der Aluminiumfolie. Quelle: Christina Geimer, BINE Informationsdienst

Figure 1
The developers at Kampf built a pilot system based on their findings from the first test system. The electrode rods provide an even corona treatment over the entire width of the aluminium foil. Source: Christina Geimer, BINE Informationsdienst
(300 dpi, jpg, 1.2 MB)

Die Koronastation soll an einen solchen Sepamat zur Aufwicklung der Folie angeschlossen werden. Quelle: Kampf Schneid- und Wickeltechnik GmbH & Co. KG

Figure 2
The corona station should be connected to a Sepamat of this type for winding the foil.
Source: Kampf Schneid- und Wickeltechnik GmbH & Co. KG
(300 dpi, jpg, 784 kB)