Founder Hideo Sato opened Sato Paper Works at 1-10 Ichioka-dori, Minato-ku, Osaka. The factory specialized in paper tubes and primarily served the electrical industry.

Our company was reorganized as Showa Marutsutsu Kogyosho, a limited partnership. We became a designated factory for the Osaka Army Ordnance Supply Depot, and our production of military containers and other items expanded.

In the early 1940s, the company was reorganized as Showa Marutsutsu Co., Ltd.　 After World War II, the textile industry flourished in Japan. Our company focused on paper tubes for synthetic fibers rather than natural fibers, and began developing and manufacturing them.

Japan's textile industry continued to grow, and its manufacturing process evolved. Our company focused on these changes and developed new paper tubes and metal bobbins for textiles.

We entered into a capital and technology partnership with Sonoco Products company in the United States, and established a joint venture named Showa Products Co., Ltd., which introduced various technologies from Sonoco Products.
We also established Showa Plastic Molding Co., Ltd.

We began supplying paper containers to the Japanese snack market with our composite can technology.
On the other hand, the manufacturing process of synthetic fibers has evolved further, and we have started to supply POY and DTY paper tubes to the market.

The composite can technology was applied to sealant containers and toner containers, opening up new markets.

Sonopost and Angleboard technologies have brought new products to the market in the protective packaging market segment.
The Plaza Accord led to a significant depreciation of the dollar, which caused an economic downturn known as the collapse of the bubble, and Japanese manufacturing industries rapidly relocated their production bases to Southeast Asia. This resulted in a significant decrease in our company's revenue.

Amid the prolonged economic downturn, plastic cores for films used in printed circuit boards gradually began to grow. We built up the production capacity to supply high-precision products to the market with short delivery times.

The plastic core market has grown and become a large market. We have been working on developing flexible packaging for liquids using new connector technology. We established Pac Plus as a new company by spinning off this flexible packaging business.

Our company will celebrate its 100th anniversary in 2023. We have also begun developing thermal conductive materials as a new business.