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OwnerPhilippe Gilbert Letzelter, Anna Margareta Lundhinventors
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The present invention relates to security paper and security paperboard that comprises respectively base paper and base paperboard having one or several layers of pulp fibre, plus a surface treatment layer on at least one side of the base paper and base paperboard, wherein said layer is congruent with said base paper and base paperboard, and wherein at least one layer forms part of at least one local deviation in the form of a distinctive mark. The invention is characterised in that the local deviation includes locally compressed material plus a local surface treatment layer whose thickness exceeds the thickness of the corresponding surrounding and outwardly lying surface treatment layer. The present invention also relates to a method of manufacturing security paper and security paperboard.
Security paper/paperboard that includes one or more layers of pulp fibre forming a base paper/paperboard, together with one or more surface treatment layers congruent with the base paper/paperboard on at least one side thereof, wherein at least one such surface treatment layer forms a part of at least one local deviation in the form of a distinctive mark, characterised in that the local deviation includes locally compressed material plus a local surface treatment layer whose thickness exceeds the thickness of the corresponding surrounding and outwardly lying surface treatment layer.
A method of manufacturing security paper/paperboard, wherein a travelling paper/paperboard web, optionally after having applied surface size thereto, is coated congruently with coating slip in at least one stage, characterised in that the travelling paper/paperboard web is caused to pass between an embossing roll and a counter-pressure roll forming an embossing unit in any position whatsoever prior to applying the first coating slip, said embossing unit leading to at least one compressed, and thereby depressed, local surface which forms a distinctive mark on the paper/paperboard web, wherein said depression is filled at least partially with said applied first coating slip such that the thickness of the coating layer on said local surface will be greater than the thickness of the corresponding surrounding and outwardly lying first coating layer.
A method of producing security paper/paperboard wherein, after the possible application of surface size, a first coating slip is applied congruently to a travelling paper/paperboard web so as to form a first coating layer and subsequent to drying said layer, a further coating slip is applied congruently to said paper/paperboard web in at least one stage,
Dependencies are inferred from the claim text.