Based on the physical characteristic that one part of liquid nitrogen warms and expands into 700 parts of gaseous nitrogen, Chart dosing systems are used to pressurise and/or inert (N2 flush) products and its packaging. As new packaging technology and products evolve, so has a demand for refined dosing results. Chart has met the challenge with innovation, key partnerships and detailed application analysis.
Pressurisation In Packing Applications
A precise dose of liquid nitrogen is delivered immediately before capping or seaming. The trapped LN2 quickly vaporisers, pressurising the container. In hot fill applications, the nitrogen pressure counteracts the vacuum created when a hot product cools.
An exact dose of liquid nitrogen is introduced seconds before the seamer or capper. In the process, the small dose of liquid nitrogen gasifies up to 700 times its volume. The large volume of gaseous nitrogen pushes the oxygen out of the container.
A dose of liquid nitrogen is introduced to “lock in” and surface freeze the product (novelty ice cream) before it’s transferred to a traditional tunnel or spiral freezer. Recently, Chart has been partnering with retail ice cream shops to fast freeze customised desserts with liquid nitrogen to enhance the taste and texture.
Modified Atmosphere Packing (MAP) Applications
A large dose of liquid nitrogen is introduced into the package seconds before the seamer or capper. In the process, the dose of LN2 gasifies up to 700 times its volume. The large volume of gaseous nitrogen pushes the oxygen out of the container.