D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 17/64 (2006.01) D21H 17/00 (2006.01) D21H 17/70 (2006.01) D21H 19/38 (2006.01) D21H 23/08 (2006.01)
Patent
CA 2046285
Process in manufacturing paper wherein stock is prepared using cellulose fiber material which contains calcium sulfate (gypsum), said material being disintegrated in an aqueous medium in order to form part of the stock for the paper to be pro- duced. The characterizing feature of the process is that (a) carbonate ions and/or hydrogen carbonate ions (CO32- or resp. HCO3-) are supplied to the aqueous medium, and (b) the pH in the aqueous medium is adjusted to an alkaline value so that calcium carbonate precipitates and forms part of the suspension. There are overall major advantages provided by the pro- cess in the context of applying gypsum coatings on paper, inasmuch as broke can be reused in the process without any trou- blesome gypsum precipitation. Moreover a new grade of coated paper is described, the characterizing feature of this paper being that the filler of the base paper consists entirely or partly of precipitated calcium carbonate (PCC) and that the pig- ment of the coating layer consists entirely or partly of calcium sulfate.
Andersson Kjell Rune
Kuni Stefan Olof
Ostensson Per Ove Leo
Macrae & Co.
Mo Och Domsjo Aktiebolag
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