Application Of Clay Coating For Water Resistant Corrugated Packaging

摘要

Application of a delaminated kaolin clay base coat onto linerboard provides a barrier coating for a subsequently applied polymer topcoat with combined potential advantages of increased paper stiffness and improved water resistance at a reduced polymer overcoat application. Replacement of a fraction of polymer coating by kaolin should not compromise the recyclability of wax alternative packaging. Motivated by coating material cost reduction, the feasibility of the technique is demonstrated by applying a delaminated clay coating on-line followed by an acrylic overcoat and measuring the various resulting physical properties. Test boxes were manufactured with commercially supplied treated specialty medium using a pilot single facer with a modified carrier starch adhesive and manual dou-blebacking. Stacking compression strength retention as affected by coatings was evaluated after exposure of the various test containers to a high humidity ice-pack test. Results show that good performance and appearance of corrugated boxes can be achieved at lower overall coating costs with linerboard facings having a kaolin base.