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MAP beverage container permits material reduction

MAP beverage container permits material reduction
Functional insert (dark portion) contains a gas.

“Thin is in” has long been a part of sustainable packaging—and usually cost savings—in the form of source reduction. However, that tactic can be problematic for perishable products in PET bottles that are filled and capped at elevated temperatures because the containers can deform as the product cools. Bottles can be thick-walled to withstand this temperature-induced deformation, but that runs counter to everything that is green…and counter to cost-effectiveness due to the need for additional polymer or other material for container strengthening.

A proven solution to the above for aseptically and hot-filled products are PET containers that have (a) flexible panel(s) or a base designed to offset the deformation and keep the package looking good.

Now there’s another solution, from BASF Corp., that addresses this problem in a unique way using modified atmosphere packaging (MAP). The patent filing centers on an insert at the top of the bottle or container—described as a “storage vessel pressurization component”—that both absorbs and releases gas in the headspace in a manner that lowers the vapor pressure and thereby the deformation.

The patent identifies several storage vessel materials including one or more of carbon, activated carbon, a zeolite and a metal organic framework (MOF) composition. This structure stores a gas such as nitrogen, argon, carbon dioxide, other gas or mixtures of gases, according to the patent, which details 28 “embodiments” or different ways that the intended pressure control can be accomplished using these materials. The intended benefit is a package that requires less material to reduce costs while improving the sustainability of the package.

Applicable packaging includes bottles, cans, pouches and other containers.

You can find the full patent here at

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