| 摘要 |
PROBLEM TO BE SOLVED: To provide a method by which an excellent pulp can readily be produced from an unutilized resource such as a long fiber plant such as a flax or a mixed chip, etc., of a tropical timber which has hither been scarcely utilized because of difficult cargo collection and storage in a wet state and slight cookability even if the unutilized resource is abundant. SOLUTION: The method is to readily produce the pulp widely from the unutilized and slightly cooked fiber raw material resource. Thereby, the fiber raw material resource which has hitherto been scarcely utilizable because of the slight cookability even if the fiber raw material resource is abundant can be pulped by carrying out a treatment under atmospheric pressure and normal temperature with a cooking liquor of a neutral hydrogen peroxide-oxalate(NPO) method as a pretreatment prior to the cooking of a hydrogen peroxide- alkali(PA) method or further, as desired, conducting a heating treatment according to the PA process. In addition, the cargo collection and storage are facilitated.
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