Electrostatic spray coating apparatus and method

B - Operations – Transporting – 05 – C

Patent

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Details

B05C 1/08 (2006.01) B05B 13/02 (2006.01) B05C 5/02 (2006.01) B05C 11/02 (2006.01)

Patent

CA 2443485

A liquid coating is formed on a substrate by electrostatically spraying drops of the liquid onto a liquid-wetted conductive transfer surface (14) and transferring a portion of the thus-applied liquid from the transfer surface to the substrate (16). Optionally , one or more nip rolls (26) force the substrate against the transfer surface, thereby decreasing the time required for the drops to spread and coalesce into the coating. Preferably, the coating is passed through an improvement station comprising two or more pick-and-place devices (39) that improve the uniformity of the coating. The coating can be transferred from the conductive transfer surface to a second transfer surface and thence to the substrate. Insulative substrates such as plastic films can be coated without requiring substrate pre-charging or post-coating neutralization. Porous substrates such as woven and nonwoven webs can be coated without substantial penetration of the coating into or through the substrate pores.

L'invention concerne un revêtement liquide formé sur un substrat par pulvérisation électrostatique de gouttes de ce liquide sur une surface de transfert conductrice mouillée par liquide (14), et par transfert d'une partie du liquide ainsi appliqué entre la surface de transfert et le substrat (16). Un ou plusieurs rouleaux pinceurs (26) peuvent éventuellement presser le substrat contre la surface de transfert, d'où une diminution du temps requis pour que les gouttes se répandent et forment ce revêtement par coalescence. De préférence, ledit revêtement traverse une station d'optimisation comprenant au moins deux dispositifs de transfert (39) permettant d'améliorer l'uniformité du revêtement, lequel peut être transféré entre la surface de transfert conductrice et une seconde surface de transfert, puis vers ledit substrat. On peut revêtir des substrats isolants, tels que des films plastiques, sans qu'il soit nécessaire d'effectuer un chargement préalable du substrat ou une neutralisation des gouttes après leur application. Il est aussi possible de revêtir des substrats poreux, tels que des bandes tissées et non tissées, sans que le revêtement ne pénètre de manière appréciable dans ou à travers les pores du substrat.

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