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Carrier Transicold has said that its Everfresh active controlled-atmosphere system for refrigerated containers now offers a new carbon dioxide (CO2) injection option to better preserve low-respiring, high-value perishable cargo.

The new option allows the container to be pre-charged with CO2 at the start of a voyage and automatically add more over the course of the trip.

The group said that it was the only container refrigeration system manufacturer to offer a controlled atmosphere (CA) system with an integrated option to add CO2 on demand.

“The option is beneficial for cherries, blueberries, grapes, papayas and other low- to moderate-respiring commodities that do not create a lot of CO2 on their own,” said Jim Taeckens, senior product manager for global container refrigeration at Carrier Transicold. “This technology allows customers to better protect and extend the shelf-life of high-value commodities, which is especially important.”

Using active CA technology, the Everfresh system optimises the balance of oxygen and CO2 within a refrigerated container to reduce respiration and slow the natural ripening of the commodity by generating high-purity nitrogen to more quickly and responsively displace oxygen, Carrier said.

The system maintains a positive pressure within the container, making it less sensitive to box air leakage than other controlled-atmosphere methods.