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AssigneeStora Enso OYJ
InventorsJari Rasanen, Johanna Lahti, Antti Savolainen, Jurkka Kuusipalo
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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.
A method for digitally printing a polymer-coated paper or board (1), in which printing ink particles are applied to an electric field to a printing surface formed of a polymer coating, corresponding to printing, and the printing ink is adhered to the printing surface by fusion with the aid of infrared radiation in order to form a print, characterised in that the printing is performed on a paper or board (1, 2) provided with an inner coating layer (3) containing electrically chargeable ethene acrylate copolymer and an outer polyolefin-based shield layer (4) disposed on top of this and providing mechanical strength, forming the printing surface receiving printing ink.
A method as defined in any of the preceding claims, characterised in that the inner electrically chargeable coating layer (3) of the paper or board contains ethene methyl acrylate copolymer (EMA), in which methyl acrylate monomer accounts for approx. 20 molar %.
A method for producing a product package equipped with prints, characterised in that a polymer-coated packaging paper or board is digitally printed as in any of the preceding claims and is subsequently creased and heat-sealed to form a package.
Dependencies are inferred from the claim text.