초록 ▼

The core of the present invention resides in supplying pigment in a kind of “basic grade”, preferably as a solid, and milling in an aqueous phase in situ in a satellite milling plant to obtain the desired whiteness and grain size. As a result of this invention, papermakers are no longer bound to pre

The core of the present invention resides in supplying pigment in a kind of “basic grade”, preferably as a solid, and milling in an aqueous phase in situ in a satellite milling plant to obtain the desired whiteness and grain size. As a result of this invention, papermakers are no longer bound to predetermined particle sizes of the fresh pigments and/or fresh fillers and pigment slurries obtainable from suppliers of raw materials. Papermakers are capable of preparing themselves pigment slurries in a satellite plant in situ according to the current needs. This permits a flexible and quick reaction to changing quality and production requirements, as well as lower shipping costs because no water is shipped as would be necessary in the usual slurry, and an improved stability of the self-prepared pigment slurry, as compared to the prior art.

대표청구항 ▼

The invention claimed is: 1. A method for preparation of coating compound for the paper industry, comprising:obtaining raw natural calcium carbonate fillers and raw pigments of a basic grade as solids having a mean grain diameter (D50) of 2 μm to 10 μm from suppliers of raw materials;milling said ra

The invention claimed is: 1. A method for preparation of coating compound for the paper industry, comprising:obtaining raw natural calcium carbonate fillers and raw pigments of a basic grade as solids having a mean grain diameter (D50) of 2 μm to 10 μm from suppliers of raw materials;milling said raw natural calcium carbonate fillers and raw pigments in an aqueous phase in-situ at the paper mill to obtain a self-prepared pigment slurry comprising 2-60% fillers and pigments by weight having a desired particle size with a grain distribution of from 10 to 99% by weight of particles <1 μm, respectively based on the equivalent diameter, andemploying said self-prepared pigment slurry for the preparation of a coat for paper coating or in the paper stock, wherein said aqueous phase comprises residual water sludges.