Rengo Co Ltd (Rengo) is the largest general packaging manufacturer, providing integrated packaging solutions across paperboard, corrugated packaging, folding cartons, flexible packaging, heavy-duty packaging, and related services.

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Rengo's R&D initiatives is focused on advancing its strategy as a "General Packaging Industry (GPI) Rengo," emphasizing materials science, converting, printing technologies, and process engineering to create packaging that is both higher value-added and lower impact. The company prioritized sustainable packaging in both paper and plastics, with a focus on lightweighting, CO2 reduction, and expanding carbon footprint calculation capabilities. In flexible packaging, Rengo strengthened its innovation platform by integrating Sun-Tox and Mitsui Chemicals Tohcello's packaging solution business into RM TOHCELLO and completed a new R&D Center to accelerate next-generation film development. The company also expanded into the "bio" business by acquiring Biomaterial in Tokyo Co., Ltd., and continued to develop functional films and lower-impact packaging concepts in its Heavy-Duty Packaging-Related Business. The R&D units of Rengo include the newly integrated RM TOHCELLO and the R&D Center completed by Howa Sangyo. These units are responsible for managing the company's R&D activities, focusing on innovation in flexible packaging, next-generation film development, and sustainable packaging solutions. In FY2025, the company incurred expenses of JPY3,154 million on R&D, which as a percentage of revenue, stood at 0.3%.