Integrating barrier chemicals into coating systems for optimized white top testliner performance

English (OpenAlex)

Abstract This investigation examined the development of a coating blend suitable for white top testliner paper to enhance its barrier properties and printability. The research focused on analyzing and elucidating the rheological and barrier properties crucial for the effective application of coating color. A double-coat application process was employed, with the pre-coating layer filling the rough surface profile and the top-coating layer improving the smoothness. Clay and calcium carbonate were used as pigments and latex as binder. Dispersant and thickener were also added. A barrier chemical was also incorporated in select formulations. The results indicated that the coating significantly modified the optical and barrier properties of the paper. The brightness, whiteness, and grease resistance increased, whereas the air permeability decreased. Barrier chemicals were particularly efficacious in reducing wettability and improving grease resistance. In conclusion, this study demonstrates that a well-designed coating strategy can enhance the functionality of recycled paper, rendering it a more viable option for packaging application.