Spray application of an additive composition to sheet materials

B - Operations – Transporting – 05 – D

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B05D 1/02 (2006.01) C09K 3/30 (2006.01) D06M 23/06 (2006.01) D06M 23/10 (2006.01) D21H 23/24 (2006.01) D21H 23/50 (2006.01) D21H 21/22 (2006.01)

Patent

CA 2305356

The present invention is directed to methods for the spray application of additive compositions containing additive materials in the manufacture of sheet material products, such as paper products, textile products, and flexible sheet products by using compressed fluids, such as carbon dioxide and ethane as a spraying medium. Additive compositions with high viscosity and which are substantially free of water and/or volatile solvent can be applied to sheet materials. Water-home additive compositions with reduced water content can also be applied to sheet materials. One preferred spray method uses a decompressive spray of the compressed fluid which produces a uniform spray pattern and a narrow droplet size distribution that can improve application efficiency and quality when additive compositions are applied during the spraying step to rapidly conveyed sheet materials.

La présente invention concerne des procédés de pulvérisation de compositions d'addition contenant des matières d'addition lors de la fabrication de produits en feuilles tels que des articles en papier, des produits textiles, et des produits en feuilles souples, par utilisation de fluides comprimés tels que du dioxyde de carbone et de l'éthane comme supports de pulvérisation. On peut appliquer des compositions d'addition à grande viscosité et sensiblement exempts d'eau et/ou de solvant volatil sur des matières en feuilles. On peut également appliquer des compositions d'addition aqueuses à teneur en eau réduite sur des matières en feuilles. Un procédé de pulvérisation préféré consiste à recourir à une pulvérisation à l'état décomprimé du fluide comprimé afin d'obtenir une pulvérisation uniforme et une répartition en dimension étroite des gouttelettes, ce qui peut améliorer l'efficacité et la qualité d'application lorsque des compositions d'addition sont appliquées pendant la phase de pulvérisation sur des matières en feuilles rapidement déplacées.

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