HIGH-TEMPERATURE DEINKING METHOD AND DEINKING AGENT

摘要

PURPOSE:To provide a deinking method and to obtain a deinking agent capable of getting regenerated pulp having high quality under high flotation temperature condition. CONSTITUTION:A waste paper raw material composed of magazine paper and newspaper at a weight ratio (magazine/news) of 5/95 to 60/40 is deinked by setting the treating temperature in the flotation step to 40-80 deg.C and adding a deinking agent having a cloud point of 45-90 deg.C and containing an alkylene oxide adduct to an oil and fat to at least one step in the deinking treatment process.