Curtain coating process using a high solids content...

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 23/48 (2006.01) B05D 1/30 (2006.01) D21H 19/44 (2006.01)

Patent

CA 2572813

The invention relates to a curtain coating process for coating substrates with a stable curtain and a uniform coating at low flow rates wherein a free- falling curtain of an aqueous composition comprising a high solids content is coated onto the moving substrate at a flow rate per unit die length value (Q) equal to or inferior to 10-4 m3/(s.m), the said high solids content composition comprising a polymeric rheology modifier and a non-ionic surfactant. The invention relates in particular to a curtain coating process for coating fibrous substrates such as paper or board. The invention also relates to a coated product.

La présente invention concerne un procédé d'application au rideau permettant de recouvrir des substrats d'un rideau stable et d'un revêtement uniforme à faibles débits. Selon cette invention, un rideau à écoulement libre d'une composition aqueuse comprenant une forte teneur en solides est appliquée sur le substrat en mouvement à un débit par valeur de longueur unitaire de la matrice (Q) égal ou inférieur à 10-4 m3/(m/s), laquelle composition à forte teneur en solides comprend un modificateur de rhéologie polymère et un tensioactif non ionique. Cette invention concerne en particulier un procédé d'application au rideau permettant de recouvrir des substrats fibreux tels que du papier ou du carton. Cette invention concerne en outre un produit ainsi revêtu.

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