摘要 |
<P>PROBLEM TO BE SOLVED: To provide a papermaking method in which yield may be improved, freeness and a dewatering property may be improved, and paper quality, particularly opacity may be improved without spoiling texture in a process of making paper and paperboard. <P>SOLUTION: In a papermaking step, a diluted water-soluble polymer dispersion, which contains both fine particles with a particle size of 100 μm or less having one or more kinds of ionic properties selected from a cationic property and an amphoteric property and polyalkylene imine and/or a polyalkylene imine-modified substance, is added as a first liquid to a papermaking stock prior to papermaking, and then, a yield-improving agent including a cationic or amphoteric acrylamide-based copolymer is added as a second liquid. <P>COPYRIGHT: (C)2013,JPO&INPIT |