| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing paper, capable of maintaining a high yield based on a paper-making raw material and a high value of durability of the produced paper, even when the paper is made by using a paper-making raw material in which a mixed ratio of mechanical pulp or waste paper is increased, and further capable of bringing about a remarkable effect, even in an acidic paper-making system in which aluminum sulfate especially exists. SOLUTION: This method for producing the paper comprises adding an anionic water-soluble polymer to the paper-making raw material in which an amphoteric paper strengthening agent is contained and which is in a state prior to paper making, for the purpose of increasing the durability of the paper. The remarkable effect is brought about by making the anionic water-soluble polymer contain sulfonic acid groups. The method brings about the remarkable effect in the paper-making system in which the paper making is conducted by especially adding the aluminum sulfate thereto. COPYRIGHT: (C)2005,JPO&NCIPI
|
