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FLEXO Magazine : June 2013
new three-ply laminate plus printable barrier coating by pro- viding lower cost than alternative high performance barriers. PRACTICAL CONCERNS Application weight of barrier coatings is critical to obtaining high barrier numbers. Depending on the substrate, applica- tion weights need to be adjusted to attain the barriers desired. In Figure 5, the relationship between application weight and oxygen performance is detailed. Anilox and gravure suppliers can offer advice on the best screen and line combinations for the deposition weights desired. The nano clay coatings are often supplied in two or more parts that need to be mixed together before use. An air-powered mixer press-side is usually adequate to mix the components before use. Newer versions are available as a one-part system and should be kept from freezing. Corona treat films before coating, as it will enhance adhesion and improve lamination bond strength. Figure 4: Oxygen barrier enhancement of a commercial three-ply laminate to a new three-ply laminate plus printable barrier coating provides lower cost than alternative high performance barriers. Figure 5: Relationship between application weight and oxygen performance is detailed. 104 FLEXO June 2013 www.flexography.org