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What surface treatments are necessary for Printed BOPP Films?
Because raw polypropylene possesses a inherently low surface energy, it is naturally resistant to liquid adhesion, meaning that inks will not stick to it without preliminary preparation. Therefore, Printed BOPP Films undergo a rigorous corona discharge treatment or flame treatment during the manufacturing process to artificially raise the surface tension of the material. This critical treatment alters the molecular structure of the film surface on a microscopic level, creating chemical bonding sites that allow printing inks and laminating adhesives to fuse permanently.
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