When it comes to the development of materials for shelf-stable and extended shelf-life food products, the use of barrier packaging material solutions achieved through performance materials and multi-layer coextruded barrier structures is required to keep the product safe and secure from the harmful effects of oxygen and moisture permeation that lead to food spoilage.
To better understand the role of barrier requirements, it helps to take a deeper look into the mechanisms used for testing these barrier packaging materials and how they contribute to the complete barrier packaging material solution. Two of the most important and widely used test method and standard used in food packaging industry used to establish barrier properties and thus shelf-life expectations this are the Oxygen Transmission Rate (OTR) and Moisture Vapor Transmission Rate (MVTR).
What is OTR?
Oxygen Transmission Rate (OTR) is the measurement of the amount of oxygen gas that passes through a substance over a given time period. OTR for plastic film material is the steady-state rate at which the oxygen gas permeates through a film at specified conditions (temperature and relative humidity). OTR is measured for different food (solids and liquids) and medical packaging material solutions such as wood, cork, glass, aluminum, plastics (rigid and flexible), etc. In food packaging, permeation of oxygen through the packaging over time contributes to a process of food decay called oxidation, therefore, extending product shelf life through customized material barrier structures to reduce the rate at which oxygen permeation occurs is critical to maintaining the safety and quality of the food product.
What is MVTR?
Moisture (Water) Vapor Transmission Rate (MVTR/WVTR) is the measurement of amount of water vapor that permeates through the substance over a given time period. Similarly to OTR, MVTR is measured at specified condition such as temperature and relative humidity to either replicate the actual condition of use or run an accelerated testing for shelf life calculation.
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https://www.linkedin.com/pulse/otr-mvtr-wvtr-barrier-food-packaging-sheshdhar-jha
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