Leakage Testing with Hydrogen

Leak Detector Mapax LD

10.04.2012 Linde's Mapax LD is a system for detecting leaks in packages under a protective atmosphere. The technology uses hydrogen as a detection gas so that the smallest leaks are quickly detected in a non-destructive and reliable process.

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Leak Detector Mapax LD

Errors in the packaging line are signalised at an early stage (Picture: Linde)

To preserve the natural freshness and quality of foods, products are today often packaged under food-grade protective atmospheres. Bread, cheese, cold cuts, and many more foods thus remain protected – as long as the packaging is air-tight. The technology permits relaible early detecton of leaks which impair quality, for example due to defective sealing. The leak detection system uses hydrogen as a detection gas instead of carbon dioxide or helium. For this purpose a small quantity of hydrogen (approx. three percent) is added to the packaging gas. In the event of a leak a slight mechanical pressure on the packaging will cause hydrogen to escape from the packaging. Thanks to the sensitive hydrogen sensor, the system works faster than conventional detectors and detects even small leaks in a fraction of a second. Inline operation is possible, i.e. during production. The system is located directly downstream of the packaging machine and can be adjusted to the respective belt speed. Depending on the package size, inspection at up to 60 cycles per minute is possible. Flow-pack wrappers and trays of different heights can be inspected.

With the 100 percent inline inspection of all MAP packages, errors in the packaging line are signalised at an early stage and defective products automatically ejected. A high quality standard is allowed and returns by retailers are reduced.

ACHEMA 2012 Hall 9.1 – D4

 

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