Incorporating as Rengo Shiki and consolidating the trade — vertical integration from board to box (1920)

Enclosure became the standard

The core of the 1920 decision lies in reworking a shop that depended on one man’s skill and credit into a company that runs on capital and equipment. Inoue Teijiro pursued the consolidation of his trade and the taking-in of containerboard almost simultaneously, placing scale and vertical integration at the centre of competition in a cushioning material where quality separates no one. Remaking a business whose earnings swung with every rise in raw-material prices — as long as it stayed a pure converter — into a structure closed from raw material to finished product is what led to its subsequent stable competitiveness.

That vertically integrated model became the reference point Rengo returned to again and again in later capital-renewal investment and industry restructuring. In the way a new product named by one individual spread into the industry’s standard form by way of incorporation and consolidation, one can see the continuity between the strength of a first mover holding the category and the idea of re-securing it through scale and integrated production. The founding by naming and the incorporation by enclosure — two decisions layered together — formed the prototype of the Rengo of today.