Metal oxide nanoparticles were successfully deposited on-line at atmospheric conditions on packaging materials using a thermal liquid flame spray (LFS) method. LFS is a novel method for producing nanoparticle coatings on paper, paperboard and low density polyethylene (LDPE) laminates. Most of the present surface treatment/deposition methods are batch processes and require special conditions, e.g. low pressure atmosphere, which increase the operation costs and set limits for industrial applications. The LFS coating process is demonstrated in Figure la and the influences of process parameters on coating quality are presented. Physical and chemical properties of nanocoatings were investigated using scanning electron microscopy (SEM), water contact angle measurement, X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). Droplet behaviour on the nanocoated surfaces was illustrated by high speed video system images.
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