Coated paperboard for formed articles

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 19/72 (2006.01) D21G 1/00 (2006.01) D21H 25/14 (2006.01) D21H 11/04 (2006.01) D21H 19/36 (2006.01) D21H 27/38 (2006.01)

Patent

CA 2214977

Coated paperboard for formed articles, which paperboard consists of a fibermatrix in one, two or more layers and a coating and has adequate surface for printing and adequate surface gloss for each specific type of formed articles, is disclosed. The paperboard has been calendered after coating with a healable calender having a soft extended nip and has reduced density and reduced grammage at a given value for bending force compared to corresponding coated paperboard which has been calendered before or before and after coating with a healable or non-healable calender having a hard or soft nip. Additionally, a production line for the production of such coated paperboard, a process for the production of such coated paperboard, and a method of reducing the susceptibility to crack formation at folding of such a coated paperboard, are described.

L'invention concerne un carton portant un revêtement, pour des articles formés, qui est constitué par une matrice de fibres avec une ou deux couches ou davantage et un revêtement. Ce carton présente une surface permettant une bonne impression et une surface brillante convenant aux différents types d'articles formés. Le carton est calandré après l'application du revêtement avec une calandre chauffable qui présente une surface de contact entre les cylindres qui est augmentée et qui est souple. Ce carton présente une densité et un grammage diminués pour une valeur donnée de la force de pliage par comparaison avec un carton portant un revêtement qui a été calandré avant ou avant et après l'application du revêtement, par une calandre chauffable ou non chauffable ayant une surface de contact entre les cylindres qui est dure ou souple. En outre, l'invention concerne une ligne de production d'un tel carton portant un revêtement, un procédé pour le produire et un procédé pour diminuer la sensibilité de tels cartons à la formation de fissures au pliage.

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