BOARD USING WASTE PAPER AS RAW MATERIAL AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To efficiently produce a board by pouring a slurry composition containing a waste paper and a fiber having a specific value or more of a binding factor onto a mesh. SOLUTION: A waste paper fiber obtained by applying at least one of water- repellent, water-proof or hardening treatments is formulated with 3-30 wt.% fiber having >=0.15 binding factor, e.g. a microfilament, obtained by treating a cellulosic fiber and having >=150% water retention value to prepare a slurry composition having >=550 ml Canadian standard freeness, and the obtained slurry is poured onto a mesh to form an accumulated layer in a wet state on the mesh. Heated air of 1 l/cm2 flow rate is passed on the accumulated layer to dry the layer and to provide the objective board.