At the present time, as every body knows, hard wood pulp has been used in great quantities for various species of paper and board.
More over Copse has come to be used besides beech wood that has been considered as the typical wood for which studies have been made.
This may be due partly to various conditions of material, but mainly because the characteristics of hard wood fibres have be fully acknowledged to make superior kinds of paper and board.
This report has been prepared, because our mill has been using hard wood as sulphate pulp and as to 26 species of chief hard wood which are the materials mostly used in this mill, we experimented their cooking, yield, bleaching and strength by means of the sulphate pulp.