Alkaline peroxide mechanical pulping or cold soda process, includes eight steps. Two critical steps are cumulative steaming and impregnating of the chips by a liquor containing sodium hydroxide, hydrogen
peroxide, and stablizing compounds, this having a determining effect on successful subsequent defibrating and
refining steps.In impregnating and saturating the chips, many parameters, including wood species, wood kind, chips dimensions, liquor concentration, temperature, and the duration of impregnation are involved.In this
study, by using a solution of sodium hydroxide, as impregnating liquor, the simultaneous effect of different parameters on impregnation, has been studied. The results show that, poplar wood is the most suitable for
producing APMP mechanical pulp
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