PROCESS FOR MANUFACTURING PAPERBOARD

摘要

A process for manufacturing a paperboard which comprises: a pulping step for forming a pulping-step slurry from a pulp raw material comprising waste paper as a main raw material through the macerating and refining of fibers; a furnishing step for adding a paper strong agent and other additives to the pulping-step slurry to form a furnished pulp raw material; and a papermaking step for making a paperboard from the furnished pulp raw material. Further, this process is characterized by adding (a) an aqueous solution of a hypochlorite and (b) an aqueous solution of a water-soluble inorganic ammonium salt or aqueous ammonia to the pulping-step slurry to attain a reduction in the amount of the paper strong agent to be added in the furnishing step.