The thermo-vacuum forming process is static generative with the result that a stack of trays can be highly charged. Sometimes there can be a problem de-nesting the trays or, more usually, the static problems are associated with the filling of the trays with product.

Industry: Packaging
Static Control for Blister Packaging - Select a problem:

The metal lid on the blister pack is a floating conductor. The lid can be induction-charged by the static in the plastic part of the pack and that charge is available to give a shock. The charge in a single pack is quite small, but if it goes into a larger container the accumulated charge can give painful shocks.

Some reduction in charge can be achieved by the installation of a 660 Static Discharger with its stainless steel filaments touching the lid of the blister pack as it exits the machine. Alternatively, neutralise the whole container with a long range, pulsed DC 3024L or 3850 Ionstorm Static Eliminator.

Product dust and powder on the shoulder of the tray will prevent the lid of the blister pack from making a good seal. Dust removal can be achieved by a controlled flow of AC ionised air from a 1250 or 3024 Compact Air Bar in conjunction with a simple dust collection system. The ionised airflow can be regulated to avoid disturbing the product.

An ATEX certified option for hazardous areas is also available.

If there is a large static charge on the tray it can repel the product - or at least some of the powder coating around the product. The tray can be neutralised with a short range 3014 or 1250-S Static Eliminator immediately before the filling station to prevent this.

Blister Packaging

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