Abstract
In this study, we present and discuss the technical benefits of using nanoclays as a promising property enhancer in organic polymers for food and beverage packaging. The incorporation of nanoclays can improve the thermal, mechanical, and barrier properties of a host polymer. Both natural hydrophilic and modified organophilic nanoclays provide unique characteristics to the host polymer depending on the selected applications. Besides the advantage of polymer reinforcement, various novel applications of nanoclays in food packaging have been suggested recently, such as control and release for active ingredients, antimicrobial agent, and carrier for the colorimetric indicator system. The existing migration studies discussing the transition from plastic to nanoclay packaging revealed that the diffused level of aluminum and silicon in the nanoclay packaging are within the limitation proposed in Council Directive 90/128/EEC (1990). Therefore, until now, there is no safety restriction in the use of clay nanocomposite films in food packaging applications.
Highlights
Over the last few decades, food and beverage packaging has progressed enormously because of the diverse consumer demands
One of the main drawbacks of ethylene-vinyl alcohol (EVOH) is their moisture sensitivity that causes a significant decrease in their gas barrier value when encountering the high relative humidity (RH) conditions because of the presence of hydroxyl groups from vinyl alcohol
This drawback limits EVOH to be only applicable to multilayer structures, in which the EVOH layer is sandwiched between highly hydrophobic materials, such as low-density polyethylene (LDPE) or PP, via coextrusion or lamination process [45]
Summary
Over the last few decades, food and beverage packaging has progressed enormously because of the diverse consumer demands. The passive role of packaging for logistic and marketing functions has evolved into a smart role for protection, detection, and communication. The research and development of novel hybrid materials with extraordinary properties for food and beverage packaging is one of the most expanding fields in nanoclay application according to a report from Grand View Research Inc. The global nanoclay market for food packaging was the largest segment in 2014, accounting for USD 343.0 million, and is expected to grow significantly through 2022 [3]. A recent progress and research on the advanced functions of nanoclays have been introduced in this study to extend the idea of novel applications in the active and intelligent packaging areas. The possibility of these ultrafine particles migrating from food packaging into food stuff and the perceived potential toxicity induced in humans are discussed
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