Realization of Recycling-Oriented Soceity


In the manufacturing industry, it is our social responsibility to try to minimize our impact on the environment when we choose materials and use energy to make our products. We are committed to delivering sustainable growth by carrying out our business activities.

Our approach to the creation of a recycling-oriented society

In recognition of the fact that all human activities, including those of TOKYO KEIKI, are dependent on coexistence with the natural environment, we are pursuing initiatives for the development of a sustainable, recyclingoriented society.

Specific measures for reducing waste

Compliance with laws and regulations
Waste is disposed of appropriately in accordance with laws and government ordinances, as well as the regulations of the municipalities where our factories and plants are located.

Promoting the “3 Rs”
We are now reusing some of our used products and parts (including electronic parts) instead of disposing of them.
Some of our customers and our partner factories have introduced reusable containers that can be used to move goods between each other’s factories, thereby eliminating waste of consumable materials such as cardboard and packaging materials. In addition, the evaporation and drying of waste water from glass processing and the use of equipment to reclaim cleaning solutions are helping to reduce the amount of industrial waste water we produce.
We are continuously taking measures to prevent the waste of resources, such as promoting the recycling of paper, ensuring water and oil are separated before collection, and sorting shavings by metal type for recycling.

Amount of waste produced

 As a result of promoting the “3 Rs” at each plant, the company’s overall waste output is on a downward trend. Although reducing waste while increasing production volume and making capital investments is a big challenge, TOKYO KEIKI, as a company with a responsibility to the environment, will continue looking for various ways to cut our waste output.

Recycling metal shavings
At our Nasu Plant, we are working to recycle the metal shavings produced during the machining process. Scrap metal (aluminum, iron, etc.) produced during lathing, milling, and other stages of the parts machining process is taken to an industrial waste disposal company, which recycles the scrap aluminum into aluminum products and the scrap iron into iron products. In FY 2020, we managed to recycle 4,717 kg of scrap metal (1,218 kg of aluminum, 3,150 kg of iron, and 349 kg of other metals).

Metal shavings to be separated and stored for recycling

Recycling used wash oil
The Sano Plant alone accounts for approximately twothirds of the company’s overall waste output, and roughly half of that is water-soluble cutting fluid, wash oil, and other types of waste oil. In the past, contractors were hired to collect all of this. Having established a goal of reducing waste, however, we installed equipment to recycle hydrocarbon wash oil. As a result, we were able to separate the oil content from wash oil and recycle approximately 90% of our wash oil. We confirmed that the amount disposed was one-tenth of what it was previously.
In FY 2020, we achieved 3,017 L, and we plan on reducing waste output even further by expanding this initiative to other departments going forward.

Amount of waste oil reduced through use of wash oil recycling equipment (FY 2020)

Introduction of reusable containers
The reusable containers, which are used as part of our efforts to reduce the amount of cardboard, packing materials, and other consumable materials produced as waste, have been introduced to carry items between our factories and those of nearby assembly contractors and customers. At the Nasu Plant, for example, their use currently accounts for 8% of total order value, resulting in an annual waste reduction of about 1,000 kg of cardboard.

Reusable containers used at our plants

Reducing paper consumption
・Going paperless with a general purpose workflow system
In 1980, ahead of our competitors, our Group utilized a total office automation (TOA) system powered by a core system implemented on a general purpose mainframe computer. Via this TOA system, we were able to digitalize schedule management, time cards, and various applications such as business trip expenses, increasing work efficiency.
 The functions of this TOA system were retained when we switched to an open system and built our current core system, but during the switchover, we still had many paperbased applications. In addition to the issue that processing these paper-based applications required many sheets of paper to be used, there were a variety of other problems, such as the need to physically come to the company to make an application, and the inability to know the progress of a matter while an application was being processed.
This also meant that, particularly for plants and regional offices, there were many inefficient work processes, such as mailing applications to Headquarters and post-approval filing taking large amounts of time. Building an application system into our core system in order to resolve these challenges would have required a great deal of time and money. In addition, with each matter involving its own individual planning and design, resulting in operations and input that were neither uniform nor unified, it was feared that this would actually decrease efficiency.
 Accordingly, in 2019 we introduced a general purpose workflow system in order to enable the digitization of numerous applications. The introduction of this system made it possible to design and implement workflows in one’s own department without having to request its development by an information system division. After it was introduced as a package, a total of 50 applications from a variety of departments were implemented as part of the workflow system. In FY 2020, 2,244 applications were digitized, with the majority being those of Headquarters staff departments. As a result, we significantly reduced the amount of paper used annually, including duplicates and multiple attached documents.
 Going forward, we aim to increase the types of applicable applications, reducing paper usage and, at the same time, further increasing work efficiency.

General purpose workflow system entry screen

Specific measures for proper management of chemicals

Some chemical substances have harmful effects on the environment and human body. As such, it is companies’ social responsibility to manage them properly and to take the environment and occupational safety into account.
We are working to cut our emissions of chemicals by setting voluntary reduction targets.

Switching to alternatives to hazardous chemicals
Each of our factories is actively switching to alternative materials to hazardous chemicals.

  • Cleaning agents for hydraulic products
    Switched from dichloromethane to hydrocarbon-based
  • Thinners
    Switched to alternatives free from toluene and xylene
  • Cutting fluid
    Switched to alternatives free from chlorine

Green partner initiative
The “Green Partner System” is an initiative to eliminate hazardous substances from production processes throughout the supply chain in order to encourage environmentally friendly manufacturing. TOKYO KEIKI is putting this system into practice alongside our suppliers, subcontractors, and other partners.
 Under this initiative, partners who meet our management standards and have the ability to conduct independent quality management to prevent hazardous substances being used in or contaminating their production lines are certified as Green Partners. This eliminates the need to submit a non-inclusion certificate for each product or part and to conduct some of the tests on the chemical substances they contain. We also provide various benefits to Green Partners, such as support for the testing and analysis of chemical substances contained in parts and materials, provision of environmentrelated information, and support for environment-related education.

Reducing hazardous waste
We are working to reduce the amount of hazardous substances that we dispose of by reviewing purchase lots, reducing excess inventory by subdividing orders, and encouraging the purchase of products that do not use hazardous substances.
 In the past, we used dichloromethane to remove oil from the surface of hydraulic products produced at the Sano Plant prior to the coating process. Dichloromethane, however, is a highly toxic chemical substance. After selecting, studying, and testing substitute cleaning agents, we believed we could switch to a less toxic hydrocarbonbased cleaning agent. We built our own dedicated cleaning equipment and began using it in January 2021.
Excluding certain large-sized products, we are now able to use this equipment to clean our main products and have decreased our use of dichloromethane by 85% compared to before making the change.

PRTR emissions: Sano Plant
* Emissions only (excluding transfers)
FY Dichloromethane (kg) Toluene (kg)
2016 11,900 1,300
2017 15,400 1,140
2018 18,400 1,330
2019 14,000 1,100
2020 11,000 990
PRTR emissions: Nasu Plant
* Emissions only (excluding transfers)
FY Xylene (kg) 1,2,4-Trimethylbenzene (kg)
2016 68 10
2017 43 11
2018 66 17
2019 51 12
2020 20 12

Specific measures on biodiversity

Protecting the red pine forest along the Nasu Kaido Road
Through the Nasunogahara Branch of the Nippon Bonsai Association, we are participating in efforts in support of the Enna Forest Management Office to protect red pine trees in national forests. (For details, please visit our social contributions page.)

Greening and cleaning of areas around plants
The Hanno Plant replaced aging cherry trees with evergreen shrubbery (azaleas) in order to conserve green space on the grounds. The Hanno Plant also participated in community activities, such as cleaning up leaf litter around the plant.

 At the Yaita Plant, as part of efforts to create an environment that is more suitable for birds and insects, the cedar trees planted on the green space in the north parking lot have been replaced with cherry trees. In FY 2017 and 2018, 52 cherry trees were planted at intervals of about 5 meters. As a result, insects that could not be seen when the cedars were planted have been confirmed to be living in the area.

A row of cherry trees planted in place of cedars (Yaita Plant)

Headquarters grounds certified as an Ota Ward Protected Forest
Technoport Kamata, the location of TOKYO KEIKI’s Headquarters, is an office building block that was built as a redevelopment of the site of our former headquarters and plant. Construction was completed in September 1990. Two-thirds of the vast grounds were turned into a tranquil green space environment. For the convenience of the local community, walkways around the area were provided, reflecting the original aim of the redevelopment project to contribute to the enhancement of the area.
 Thirty years after the completion of construction, the trees planted at that time have grown, turning the grounds into a conspicuous green oasis in Kamata, a district with little verdure.
 The area around our Headquarters, in particular, is surrounded by a variety of trees, and Ota Ward has designated the more than 2,000-m² green space around the Headquarters building as a “Protected Forest.”

Message from a representative of the Ota Ward Office

“In order to conserve precious greenery in the ward, Ota Ward designates trees and green spaces that meet certain criteria as Protected Trees, etc. The greenery of your company that Ota Ward has designated as a Protected Forest serves as scenic symbol of the area. Ota Ward hopes that your company will continue to protect this greenery, which provides peace and tranquility to the community.”
(Ko Machida, Ota Ward, Environmental Measures Division, Environmental Sanitation Department)