Method for manufacturing paper, cardboard and paperboard using endo-beta-1,4-glucanases as dewatering means
A process for the production of paper, board and cardboard by draining a paper stock on a wire in the presence of at least one cationic polymeric retention aid and/or retention aid system with sheet formation and drying of the sheets, wherein an endo-β-1,4-glucanase is metered in an amount of from 0.00001 to 0.01% by weight, based on the dry paper stock, into the paper stock before the addition of the at least one cationic polymeric retention aid and/or retention aid system.
1. A process for the production of paper, board and cardboard, said process comprising:
draining a paper stock on a wire in the presence of at least one cationic polymeric retention aid and/or retention aid system with sheet formation; and
drying the sheets,
wherein an endo-β-1,4-glucanase is metered in an amount of from 0.00001 to 0.01% by weight, based on the dry paper stock, into the paper stock before the addition of the at least one cationic polymeric retention aid and/or retention aid system,
wherein the cationic polymeric retention aid is selected from the group consisting of the polyacrylamides, polyethylenimines, polyvinylamines, polydimethyldiallylammonium chloride, and any mixtures thereof.
2. The process according to claim 1 , wherein the endo-β-1,4-glucanase is metered in an amount of from 0.00001 to 0.005% by weight, based on the dry paper stock, into the paper stock.
3. The process according to claim 1 , wherein the endo-β-1,4-glucanase is metered in an amount of from 0.00001 to 0.001% by weight, based on the dry paper stock, into the paper stock.
4. The process according to claim 1 , wherein the endo-β-1,4-glucanase is metered into high-consistency paper stock.
5. The process according to claim 1 , wherein the cationic polymeric retention aid is selected from the group consisting of the polyacrylamides and polyvinylamines.
6. The process according to claim 1 , wherein the cationic polymeric retention aid is a linear, branched or crosslinked polyacrylamide.
7. The process according to claim 1 , wherein the cationic polymeric retention aid is a branched or crosslinked polyacrylamide in the form of a salt or quaternization product of a cationic copolymer of acrylamide and an unsaturated cationic ethylene monomer which is selected from dimethylaminoethyl acrylate (ADAME), dimethylaminoethylacrylamide and dimethylaminoethyl methacrylate (MADAME).
8. The process according to claim 1 , wherein the polyacrylamide has an intrinsic viscosity of at least 2 dl/g.
9. The process according to claim 1 , wherein the polyvinylamine is a vinylamine homopolymer of N-vinylformamide having a degree of hydrolysis of from 1 to 100 mol % or a copolymer of N-vinylformamide and vinyl formate, vinyl acetate, vinyl propionate, acrylonitrile, methyl acrylate, ethyl acrylate and/or methyl methacrylate hydrolyzed to a degree of from 1 to 100 mol % and having K values of from 30 to 150.
10. The process according to claim 1 , wherein the cationic polymeric retention aid is metered in an amount of from 0.001 to 0.1% by weight, based on the dry paper stock.
11. The process according to claim 1 , wherein the retention aid system is a microparticle system comprising an inorganic component.
12. The process according to claim 11 , wherein the inorganic component is selected from bentonite and silica gel.
13. A paper produced according to claim 1 .