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R. B. Jones, R. L. Fox, G. D. Miller
The performance of polyvinyl alcohol (PVOH) as a cobinder in a commercial recycled board coating was examined. Laboratory studies utilizing mixture design experiments showed that replacing soy protein in the commercial coating with PVOH resulted in brightness, sheet gloss, black ink gloss and IGT pick strength improvements. A formula containing 18 parts of a vinyl acetate/ethylene copolymer latex VAE) and 3 parts of PVOH was chosen for a mill trial based on an optimized set of performance parameters from the laboratory study. The trial coating exhibited runnability comparable to the control coating containing soy protein and showed performance advantages predicted in the laboratory study. Utilizing PVOH as a cobinder also allowed elimination of ammonia from the coating color. Board from the trial showed cleaner press performance than the control board in a commercial printing comparison. The results of this study demonstrate the utility of PVOH as a cobinder in paperboard coatings.
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Available for Purchase – Conference Proceedings
TAPPI maintains a record of key conference papers, presentations, and other conference publications, available for purchase in a variety of formats.
Polyvinyl Alcohol as a Cobinder in Paperboard Coatings, 1994 Coating Conference Proceedings