METHOD FOR INCREASING THE ADVANTAGES OF STARCH IN PULPED CELLULOSIC MATERIAL IN THE PRODUCTION OF PAPER AND PAPERBOARD
First Claim
1. A method for manufacturing paper, paperboard or cardboard comprising the steps of(a) pulping a cellulosic material containing a starch;
- (b) treating the cellulosic material containing the starch with one or more biocides; and
(h) adding an ionic polymer and an auxiliary ionic polymer to the cellulosic material;
wherein the ionic polymer and the auxiliary ionic polymer have a different average molecular weight and a different ionicity, wherein the ionicity is the molar content of ionic monomer units relative to the total amount of monomer units.
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Abstract
The invention relates to a method for increasing the benefit from starch in pulped, preferably repulped cellulosic material at paper or paperboard manufacturing comprising the steps of (a) pulping a cellulosic material containing a starch; (b) treating the cellulosic material containing the starch with one or more biocides, preferably in the thick stock area; and (h) adding an ionic polymer and preferably, an auxiliary ionic polymer to the cellulosic material; wherein the ionic polymer and the optionally added auxiliary ionic polymer preferably have a different average molecular weight and preferably a different ionicity, wherein the ionicity is the molar content of ionic monomer units relative to the total amount of monomer units.
8 Citations
28 Claims
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1. A method for manufacturing paper, paperboard or cardboard comprising the steps of
(a) pulping a cellulosic material containing a starch; -
(b) treating the cellulosic material containing the starch with one or more biocides; and (h) adding an ionic polymer and an auxiliary ionic polymer to the cellulosic material; wherein the ionic polymer and the auxiliary ionic polymer have a different average molecular weight and a different ionicity, wherein the ionicity is the molar content of ionic monomer units relative to the total amount of monomer units. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification