Digital printing of polymer-coated paper or board

Details Digital printing of polymer-coated paper or board Digital printing of polymer-coated paper or board

G - Physics

03

G

G03G 7/00 (2006.01)

Patent

CA 2560766

The invention relates to a method for digitally printing a polymer-coated paper or board (1), to a paper or board suitable for the method and to the production of a product package equipped with digital prints. During digital printing, printing ink particles are applied in an electric field to the printing surface formed of a polymer coating at locations corresponding to the print, and the printing ink is adhered to the printing surface by fusion with the aid of infrared radiation. In accordance with the invention, the paper or board (2) to be printed is equipped with an inner coating layer (3) containing electrically chargeable ethene acrylate copolymer, such as ethene methyl acrylate copolymer (EMA), and with a polyolefin-based outer shield layer (4) on top of this, which contains e.g. low-density polyethene (LDPE) and provides mechanical strength, forming the printing surface receiving the printing ink.

L'invention concerne un procédé pour imprimer numériquement un papier ou un carton à revêtement polymère (1), un papier ou un carton conçu pour ce procédé, et la production d'un emballage de produit pourvu d'impressions numériques. Lors du processus d'impression numérique, des particules d'encre d'impression sont appliquées dans un champ électrique sur la surface d'impression formée d'un revêtement polymère, à des emplacements qui correspondent à l'impression, et l'encre d'impression adhère à la surface d'impression, par fusion au moyen d'un rayonnement infrarouge. Selon l'invention, le papier ou le carton (2) à imprimer comporte une couche de revêtement interne (3) renfermant un copolymère d'éthylène et d'acrylate chargeable électriquement, par exemple un copolymère d'éthène et de méthyl-acrylate (EMA), surmontée d'une couche barrière externe à base de polyoléfine (4) qui renferme un polyéthène de faible densité (LDPE) et qui assure une résistance mécanique, ces couches formant la surface d'impression qui reçoit l'encre d'impression.

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