Influence of Topcoat Applicator Technology on Starch Migration from Precoat to Topcoat, PaperCon 2014

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This paper documents the continued investigation to better understand the migration of starch between paper coating layers. In this work, the impact of topcoat coating applicator technology on starch migration has been investigated using a double coated system. The hypothesis being tested is that a higher pressure pulse topcoat applicator technology will increase the tendency of the starch to migrate from the precoat to the topcoat because there is more water available to re-solubilize the precoat starch and drive it into the topcoat. Thermally modified (TM) corn starch and hydroxyethylated (HE) corn starch were utilized in the precoat in combination with latex. The topcoat binder system was all latex, containing no starch. The precoat was applied using a flooded nip coater for all conditions. Application technique for the topcoat was varied between jet (low pressure pulse) and flooded nip (high pressure pulse).