| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing mechanical pulp that is bulky and excellent in optical characteristics and strength by using a hardwood as a raw material. <P>SOLUTION: In a grinding process for loosing and pulping hardwood chips, a grinding treatment is performed such that the residue becomes 40-70 mass% in terms of the absolute dry weight of the total pulp. In a screening process, the residue and pulp are classified using a slit screen having a slit width of 0.15-0.2 mm. In a residue treatment process, a refining treatment is performed, and then the pulp obtained by performing the refining treatment is mixed with the pulp passing through a slit screen in the screening process. <P>COPYRIGHT: (C)2013,JPO&INPIT |
