Labthink Instruments Co., Ltd. [email protected] +86-531-85068566 Testing Barrier Properties in Cereal Packaging The satisfying crunch of a morning cereal relies on more than just the recipe. Behind the scenes, a carefully engineered packaging system works tirelessly to maintain freshness and prevent spoilage. At the heart of this system lie the plastic and metallized films that form the inner bag, acting as silent guardians against the elements. But how do manufacturers ensure these films are up to the task? The answer lies in rigorous barrier property testing. Cereal is vulnerable to two primary threats: moisture and oxygen. Moisture leads to sogginess and clumping, while oxygen triggers oxidation, resulting in staleness and offflavors. To combat these threats, packaging films must possess excellent barrier properties, effectively blocking the passage of water vapor and oxygen. Two critical tests, Water Vapor Transmission Rate (WVTR) and Oxygen Transmission Rate (OTR), are used to evaluate these barrier properties. Water Vapor Transmission Rate (WVTR) testing is crucial for ensuring cereal packaging effectively prevents moisture ingress. This test measures the amount of water vapor that passes through a film over a specific time period, under controlled temperature and humidity. By placing a dry desiccant 1
Open the catalog to page 1Labthink Instruments Co., Ltd. [email protected] +86-531-85068566 on one side of the film and a humid environment on the other, the weight gained by the desiccant over time is used to calculate the WVTR. A lower WVTR value signifies a superior moisture barrier, indicating the film's ability to maintain the cereal's dryness and crunchiness. Oxygen Transmission Rate (OTR) testing is equally vital for preserving cereal freshness. This test quantifies the amount of oxygen that permeates a film over a defined time, under controlled conditions. Placing the film between two chambers, one with a known...
Open the catalog to page 2Labthink Instruments Co., Ltd. [email protected] +86-531-85068566 testing the oxygen and water vapor transmission performance of films, sheets and related materials in the fields of food, medicine, medical devices, daily chemicals, photovoltaic, electronic and many others. While WVTR and OTR values provide valuable data, it's important to consider other factors that can affect barrier performance, such as seal integrity, puncture resistance, and impact resistance are essential to ensure product protection during transportation and storage. As consumer demand for high-quality, longer-lasting food...
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