Sheet coater

B - Operations – Transporting – 05 – C

Patent

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Details

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

Patent

CA 2434177

Continuous void-free uniform coatings are formed on substrates (24) of limited length. The substrate is wrapped around a mounting roll (20) and nipped between the mounting roll and one or more pick-and-place contacting rolls (12, 14). Coating liquid is applied to the substrate or to a pick-and-place roll, preferably as a pattern of stripes. The mounting roll (20), substrate and pick- and-place rolls (12, 14) are caused to rotate for a plurality of revolutions. Wetted surface portions of the pick-and-place roll repeatedly contact the substrate, the coating is repeatedly picked up from and placed onto the substrate, and the coating becomes more uniform. Extremely uniform and extremely thin coatings can be quickly and easily obtained, with easy adjustment of the final coating thickness.

L'invention concerne des revêtements uniformes, sans vide, continus, formés sur des substrats (24) de longueur limitée. Le substrat est enroulé autour d'un rouleau de montage (20) et pressé entre ce rouleau de montage et au moins un rouleau de contact par transfert (12, 14). Un liquide de revêtement est appliqué sur le substrat ou sur un rouleau de transfert, de préférence selon un modèle de bandes. Le rouleau de montage (20), le substrat et les rouleaux de transfert (12, 14) sont mis en rotation pour une pluralité de révolutions. Des parties de surface mouillée du rouleau de transfert viennent en contact avec le substrat à plusieurs reprises, le revêtement est récupéré à plusieurs reprises du substrat et placé sur ce dernier à plusieurs reprises, ce revêtement devenant plus uniforme. On peut ainsi obtenir rapidement et facilement des revêtements extrêmement uniformes et extrêmement fins ne nécessitant qu'un ajustement simple de l'épaisseur de revêtement final.

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