Oxygen barrier coating on 3D polypropylene food container

Oxygen barrier coating on 3D polypropylene food container
Barrier coating
Issue Date
2013 KIST-IMCM SYMPOSIUM for innovative materials
Oxygen barrier coating has been one of the important applications of a dense coating by plasma. Oxygen barrier coating is especially required to plastic food container because it has a porous structure leaking air through the pores, which makes the inside food stale. Among plastic food containers, polypropylene (PP) has been widely used material due to its low price and thermal durability. However, its inherent low surface energy and high porosity have prohibited itself from being covered by the oxygen barrier coating. In this research, we applied an interlayer of carbon coating consisting of Si and O as between PP and the oxygen barrier coating, silicon oxide (SiOx). A carbon layer was applied to provide a mechanical and thermal buffer for brittle SiOx film. We found a clear enhancement in oxygen barrier property by coating an interlayer. However, we also found the re-deterioration of oxygen barrier performance with further increasing the thickness of the interlayer. And we found such optimum behavior in SiOx thickness as well (Figure 1). These optimum behaviors were explained by the competition between oxygen barrier performance and residual strain energy, where both are increasing with increasing the coating thickness.
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