History
Modified atmosphere/modified humidity (MA/MH) packaging is a type of equilibrium modified atmosphere packaging (EMAP), which evolved due to the need for more control of humidity in the packaging. Most of the polymers that are commercially used in EMAP are polyolefin-based, characterized by low moisture vapor transmission rate (MVTR). Temperature fluctuations during the various links in the cold logistics chain are unavoidable and will result in condensation forming on the inner surface of the package. The accumulation of condensed water in packages with low MVTR is conducive for pathological and physiological disorders. Not only does excess moisture enhance fungal and bacterial decay and the formation of off odors, it also encourages leaf sprouting in topped root vegetables, regrowth of leaves and physiological disorders such as tissue discoloration and peel blemishes. Certain produce items are more sensitive to excess moisture than others.
In 1995, StePac LA. Ltd., with the assistance of the Agricultural Research Organization – The Volcani Center, began developing plastic films with higher MVTR than most commercially available EMAP products then on the market. The aim was to provide more humidity control in EMAP products and alleviate problems associated with excess moisture.
Since this original research and development work, StePac LA Ltd. has developed MA/MH films and bags for over 50 different fruits, vegetables and herbs in a product line commercially known as Xtend.
Read more about this topic: Modified Atmosphere/modified Humidity Packaging
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