To primarily provide a production technique of a chemithermo mechanical pulp using only Cryptomeria japonica grown in Japan as a raw material and to secondarily provide the chemithermo mechanical pulp and to thirdly provide a newsprint paper in which the chemithermo mechanical pulp is formulated.
The high-quality chemithermo mechanical pulp is obtained in high yield by treating a chip raw material composed of 100% Cryptomeria japonica with a production process of a chemithermo mechanical pulp including steps comprising [preliminary treatment of the chip by sodium sulfite having an initial pH of 7.0-9.5], [fibrillation by a primary refining in which a refining segment having a dam with 4 or 5-steps is attached] and [beating by secondary refining]. The newsprint paper is obtained by formulating 1-45 wt.% chemithermo mechanical pulp.
MARUTANI SHUHEI
MUKAI YOSHITADA
JPS6241389A | 1987-02-23 | |||
JPS5915589A | 1984-01-26 | |||
JPS52103501A | 1977-08-30 | |||
JP2002201598A | 2002-07-19 | |||
JPH06287882A | 1994-10-11 | |||
JPH02502389A | 1990-08-02 | |||
JPH10259585A | 1998-09-29 |
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