Manufacturing, processing, and sales of paper, cardboard, pulp, and their by-productsManufacturing, processing, and sales of daily miscellaneous goodsManufacturing and sales of functional films, adhesive sheets, and adhesives, and other synthetic resin materialsManufacturing, processing, and sale of raw materials and fuels related to paper and pulp manufacturingDesign, installation, sale, and technical guidance of related plantsNewsprintPrinting paperPackaging paperCorrugated cardboardCardboardPulpSanitary paperDiapersFeminine care productsWet wipesManufacturing of Western paperManufacturing of cardboard and corrugated cardboardManufacturing of functional materialsSale of paper productsRecycling of paper productsResearch and development of paper products
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§05
Network
NETWORK
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§06
History
34 EVENTS
Iagawa Iseki, started paper raw material trading in Mishima
Establishment of business foundation
1941: Shikoku Paper Industry No. 1 Paper Machine
1941 (Showa 16): Completion of No. 1 paper machine at Shikoku Paper Industry Co., Ltd.
1943: Preparatory meeting for founding
1943: Fourteen factories merged to establish Dainippon Paper Industries Co., Ltd.
1943 (Showa 18): Fourteen factories merged to establish Dainippon Paper Industries Co., Ltd.
In 1943, Shikoku Paper Industry Co., Ltd. and 14 other companies merged to establish Dainippon Printing, aiming to produce and sell Japanese paper. Established in Ehime Prefecture in 1943, it developed as a manufacturer of newsprint and cardboard
1945: End of World War II
End of World War II
1947: Completion ceremony
The completion ceremony was held in 1947 (Showa 22)
President Ikawa Iseki saw the flow of the Copper Mountain River, which led to the start of the Copper Mountain River water diversion project
1950: Emperor Showa visited the factory guided by President Iseki
In 1950 (Showa 25), Emperor Showa visited the factory guided by President Iseki Yoshiyoshi
Full-scale entry into the newsprint market
1952: Completion of No. 8 machine
In 1952 (Showa 27), Unit 8 was completed
Completion of Unit 8
1953: Full-scale entry into the newsprint market
In 1953 (Showa 28), full-scale entry into the newsprint market
1954: Started manufacturing and selling high-quality paper
1954: Completion of Dobayama River No. 1 Dam and Yanase Dam
In 1954 (Showa 29), the First Dam of the Copper Mountain River and Yanase Dam were completed
1955: Established craft pulp manufacturing equipment and KPI equipment, started manufacturing unsized pulp at the first KPI plant in Shikoku
In 1955 (Showa 30), the first KP factory in Shikoku started manufacturing unscreened pulp
1956: Completion of KPI sizing equipment, started manufacturing sized craft pulp
In 1956 (Showa 31), KP bleaching equipment was completed and bleaching craft pulp production began
1957: Acquired factory equipment from Dobayama River Paper Co., Ltd., and established Kawanoue Factory
1957: New installation of Kawanoue No. 3 paper machine (circular net multi-tube type)
1957: Japan's first craft liner produced on Dainippon Paper Industries' first liner-only paper machine
In 1957 (Showa 32), the Kawanoue factory and forest land were purchased, and seedling cultivation and afforestation began
Completion of the two-reel newsprint machine
In January 2011, construction of baby diaper paper factories in Thailand, China, and Indonesia began, marking the start of full-scale overseas expansion and the development of a unique portfolio
§07
News
60 ARTICLES
No Personal Information Leakage from Unauthorized Access to the Email Delivery Service "Blast Mail" (Third Report)
Daio Paper Co., Ltd. confirmed unauthorized access by a third party to the email delivery service "Blast Mail" used through a business outsourcing company. However, the investigation by an external expert organization reported that there was no leakage of personal information concerning our customers. We apologize for any concern caused by this incident and reaffirm our commitment to maintaining proper management of personal information in the future.
Order of Mixed Paper Using the Rems System "kinoshizk-FS"
Daio Paper Co., Ltd. placed an order for the mixed paper "kinoshizk-FS" utilizing wood-based materials from the Tokyo woodworking plant owned by Shimizu Construction through the Rems mixed paper ordering system, and featured it in the company's publication "stream DEW." The back cover of "stream DEW" displays the Rems certification label.
Iwaki Daio Paper 5th Boiler Emission Gas Dioxin Concentration Exceeded (Second Report)
On November 2, 2026, Iwaki Daio Paper Co., Ltd. announced that the dioxin concentration in the emissions from its 5th boiler exceeded legal emission limits. The report details the subsequent cause investigation, countermeasures, and environmental impact assessment. Measurements taken after the shutdown revealed a maximum ground-level concentration of 0.008688 pg‑TEQ/m³, well below environmental standards, concluding that health impacts are extremely minimal.
Oda Paper Company's Yokoakaya Site Biodiversity Conservation Activities Certified
Oda Paper Co., Ltd. has had its biodiversity conservation activities at the company-owned site "Yokoakaya" in Kamikashima-cho, Shikoku Chuo City, Ehime Prefecture certified as a "Promotion Activity Implementation Plan" under the Local Biodiversity Promotion Act. Yokoakaya was also certified as a "Nature Coexistence Site" by the Ministry of the Environment in 2025, and this certification indicates that the plan to continue the conservation activities has been approved.
Iwaki Daio Paper 5th Boiler Exceeded Emission Standards
At the 5th boiler of Iwaki Daio Paper, the concentration of dioxin-like compounds in the exhaust gas exceeded the emission standard of 0.1 ng-TEQ/m³N, with municipal measurements showing 1.7 and the company's measurements showing 1.5 ng-TEQ/m³N. The company shut down the boiler on October 26, inspected the equipment, implemented necessary measures, and reported to Iwaki City. The impact on the surrounding environment and health is being confirmed with relevant authorities, and the results will be announced as soon as they become available.
Daio Paper Security Inspection System Awarded for Disability Employment
This news reports that Daio Group's Daio Paper Security Inspection System received the 'Reiwa 8th Year Disability Employment Excellence Award' and was honored with the 'Chairman of the Organization's Effort...' award. The provided text does not confirm the continuation of the award name or the reasons for the award.
Signed Two Agreements with Minato Ward on Paper Diaper Stockpiling and Disaster-Time Supply
Daio Paper has entered into a tripartite agreement with Minato Ward, Tokyo, and Ito Materials Co., Ltd. regarding disaster-time support with paper diapers and other items, as well as an agreement on cooperation for providing supplies during disasters. By maintaining stockpiles through a rolling-stock method that replenishes the amount used in everyday childcare, the three parties will collaborate to support children and provide supplies to evacuation centers during disasters.
Potential Personal Information Leak Due to Unauthorized Access to Blast Mail (Second Report)
Daio Paper reported that, upon confirmation through a contracted company, there has been no leakage of personal information concerning its customers due to unauthorized access to the email distribution service "Blast Mail." Additionally, the personal information handled by the service consisted only of email addresses of attendees of the Attent Web Seminar, and it was confirmed that these were not included in the leaked data.
