CRITICAL BUBBLE SIZE AND SURFACTANT FOR CURTAIN DISRUPTION, 2008 Advanced Coating Fundamentals Symposium

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Multi-layer curtain coating has the potential to produce novel grades of paper and products that make economical use of resources. The stability of the curtain with regard to the operational window is well understood, but the influence of bubbles and non dissolved surfactant droplet in the coating formulation can be problematic. Air removal systems can be designed to remove bubbles of a certain size, but it is not clear at present, the size of bubble that can be tolerated in this coating system and design parameters for equipment to remove air. Surfactant are often added into coating color in excess; the influence of non-dissolved surfactant to curtain stability is also not clear.