History
| September 1964 | Akira Hoshikawa established a paper cutting and paper products sale business as an individual enterprise and established a plant at 5-26 Kanedacho, Moriguchi City. |
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| September 1965 | Reorganizing the company as a corporation, SAN-AI Corporation was established with capital of 1 million yen at 8-33 Tanabehoncho, Higashisumiyoshi-ku, Osaka. |
| March 1978 | Neyagawa Plant was established (2-15-5 Niwajihonmachi, Neyagawa) |
| July 1984 | Head office was newly built and transferred to its present location (3-3-3 Minamitanabe, Sumiyoshi-ku, Osaka) |
| August 1989 | Tondabayashi Plant was established (inside an industrial estate for SMEs, 2-chome Nakanochonishi, Tondabayashi) |
| April 1992 | Following issue of new stock on numerous occasions, capital was increased to 99 million yen. |
| September 1999 | Tomoko Hoshikawa was appointed as a Representative Director & President. |
| February 2003 | Neyagawa Plant acquired approval for ISO 9001:2000 registration |
| April 2003 | Neyagawa No. 2 Plant was established (3-19-25 Niwajihonmachi, Neyagawa) |
| June 2004 | Shikoku Plant was established (1094-2 Mendoricho, Shikokuchuo, Ehime Prefecture) |
| August 2005 | Tondabayashi Plant acquired approval for ISO 9001:2000 registration |
| November 2005 | Neyagawa Plant acquired approval for ISO 14001:2004 registration |
| November 2007 | Tomoko Hoshikawa was appointed Representative Director & Chairperson, and Seigo Hoshikawa Representative Director & President |
| October 2009 | Shikoku Plant was expanded |
| November 2009 | Tondabayashi Plant acquired approval for ISO 14001:2004 registration |
| October 2013 | Completion of Neyagawa Plant rebuilding |
| December 2016 | Expansion of Tondabayashi Plant |
| January 2018 | Tomoko Hoshikawa retires as chairman and representative director and becomes advisor |
| November 2021 | Obtained FSC® certification |
| January 2024 | Seigo Hoshikawa retires as representative director and president and assumes the position of chairman Shigeru Hoshikawa assumes office as representative director and president |