NanoMend Investigate the thin film coatability of BOPP film with ALD coatings
The NanoMend consortium has recently carried out research on the thin film coatability of BOPP film with ALD coatings. The research was carried out under the auspices of NanoMend consortium and continues the study reported in Tappi European PLACE Conference 2013, which investigated the surface coatability properties of biaxially-oriented polypropylene (BOPP).
This study focused on the effects of various pretreatments and surface contamination before the coating process and the further effects of the typical post-coating mechanical web handling which a material must undergo during the production process.
The research used different ways to affect the BOPP surface before and after being coated with an atomic layer deposited aluminum oxide (Al2O3) layer, which represented the thin film barrier coating. Eventually, the barrier properties of the structures were measured and the influences of the used treatments were specified.
The oxygen transmission rate results show that the surface contamination before the ALD process and the mechanical stresses faced by the coated structure in a roll-to-roll winding process caused the most detrimental effects on the barrier performance, compared with the polymer pretreatment steps. The shipping of the coated BOPP sheets between aluminum foils and the corona treatment of the thin Al2O3 layer also reduced the barrier performance, but the effect of them was only minor and much smaller than that of the surface contamination and web handling. The surface treatments prior to the ALD coating process did not improve the barrier properties obtained with the ALD coating.
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