THE 1870s: TECHNOLOGICAL IMPORT AND MATERIAL TRANSFORMATION
Following the Meiji Restoration in 1868, Japan entered a period of rapid modernization. During the 1870s, paper-making machines were imported, machine-made paper production began, and Western cardboard (board) manufacturing techniques were introduced.
This was a structural turning point. Prior to this period, Japan did not possess large-scale production of dense industrial board. The introduction of cardboard made precise geometric standardization possible.
At the same time, Western systems of measurement, including inch-based trade logic, began influencing industrial practice. From this moment, it became technically feasible to cut sheets serially, reproduce exact dimensions, and manufacture identical batches.