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J. Korean Ceram. Soc. > Volume 58(2); 2021 > Article
Journal of the Korean Ceramic Society 2021;58(2): 212-218.
doi: https://doi.org/10.1007/s43207-020-00091-4
Vermiculite-polyethylene hybrid packaging films for keep-freshness of bananas with enhanced oxygen and water–vapor permeability
Sun Bok Cho, Jeong Ho Chang
Center for Convergence Bioceramic Materials, Korea Institute of Ceramic Engineering and Technology (KICET), Chungbuk 28160, Korea
Correspondence  Jeong Ho Chang ,Email: jhchang@kicet.re.kr
Received: August 27, 2020; Revised: October 7, 2020   Accepted: October 10, 2020.  Published online: March 31, 2021.
ABSTRACT
This work reports the ceramic hybrid packaging films with a compound of polyethylene polymer and vermiculite in the presence of acid treatment, which enhances the oxygen permeability and moisture permeability of the films for the keep-freshness properties of the product. In this process, a compound in micron size containing 14% of vermiculite was produced using a twin-screw extruder. Furthermore, using this compound, films containing vermiculite were made with a blown film making machine. The dispersity and contents of vermiculite material with acid-treatment in each masterbatch and packaging film were analyzed using a scanning electron microscope (SEM) and thermogravimetric analyzer (TGA). In addition, the oxygen transmission rate (OTR) and water–vapor transmission rate (WVTR) of the vermiculite-PE packaging films were 6083 cm3/(m2 24 h·atm), and 12.67 g/m2 ·day, respectively. Furthermore, the evaluation of the shelf lives of bananas showed that the film containing vermiculite showed less browning of bananas. This means that the use of vermiculite increases oxygen and water–vapor permeability, and thus can control the oxygen concentration related to the respiration of agricultural products within the films.
Key words: Vermiculite · Hybrid · Packaging films · Oxygen · Water–vaper · Permeability
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