초록 ▼

The present invention relates to a thin printing paper with a weight per unit area in the range below 49 g/m.sup.2 and which contains wood and which is provided with surface pigmentation and which incorporates a mixture of a swellable coating silicate (sodium bentonite) and, for the remainder, conve

The present invention relates to a thin printing paper with a weight per unit area in the range below 49 g/m.sup.2 and which contains wood and which is provided with surface pigmentation and which incorporates a mixture of a swellable coating silicate (sodium bentonite) and, for the remainder, conventional coating pigments as the pigment and which, in addition, contains only bonding agent that is a natural organic bonding agent, essentially starch. Even if only lightly calendered, the paper is equally well suited for rotogravure printing and for rotary offset printing. It is preferred that the paper also contain a proportion of processed fibres obtained from old-paper.

대표청구항 ▼

[ Having thus described the invention what is claimed is:] [1.] A process for manufacturing a thin printing paper with a weight per unit area in the range of less than 49 g/m.sup.2 to 24 g/m.sup.2, which process comprises: preparing a base paper, with a weight per unit area of less than 46 g/m.sup.2

[ Having thus described the invention what is claimed is:] [1.] A process for manufacturing a thin printing paper with a weight per unit area in the range of less than 49 g/m.sup.2 to 24 g/m.sup.2, which process comprises: preparing a base paper, with a weight per unit area of less than 46 g/m.sup.2, from a paper fibre mixture comprising less than 40%-wt. cellulose, relative to the total fibre material, and with an ash content that results in an ash content of greater than 8%-wt. in the base paper, on a paper-making machine running at a screen speed of greater than 700 meters/minute; and, coating said base paper on both sides, either within or outside the paper-making machine, with a surface film that contains pigments and that has a weight per unit area of less than 5 g/m.sup.2, oven dried per side, and which is free of synthetic-organic bonding agents, is naturally bonded, and which comprises a coating pigment mixture whose solid content comprises a mixture of a swellable coating silicate, and mineral coating pigments, in a weight ratio of between 40 to 60 parts by weight, relative to the pigment mixture, of a swellable coating silicate and 60 to 40 parts by weight, relative to the pigment mixture, of mineral coating pigments and a natural organic bonding agent within a range of 1 to 15 parts by weight relative to the mixture, which is dry in each instance, and additives such as agents that affect the rheology, dyes, and wet-strength agents.