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|Item||FY 2017 results||FY 2018 results|
|Total volume of raw materials used||(Consolidated) 798,000 tons||(Consolidated) 796,000 tons|
|Ratio of rubber recycling||(Consolidated) 2.3%||(Consolidated) 2.4%|
- Supervised by the 3Rs Committee
Why is “Materials” a critical issue to be addressed?
Explanation of the reason and background
Policies and stance relating to raw materials
Vision (attainment goal) / target
Measures for vision achievement
- We will review factors such as structural design and material rigidity to fulfill the required performance while achieving weight reductions.
- We will work to promote sales of retread tires.
- Furthermore, we will develop tires and belts with a high regenerated mixture ratio, and reusable products.
Expand the use rate of rubber recycled materials
Rubber recycled materials can be categorized as three types?rubber powder, reclaimed rubber, and rubber regenerated from in-house sources.
The percentage of raw materials (compounds) accounted for by rubber recycled materials was 2.36% for the entire group (2.46% for domestic business locations and 2.27% for overseas business locations). We are working to enhance rubber compounding and blending technologies with the aim of increasing the adoption ratio of rubber recycled materials overseas.
Regenerated rubber powder is a powdered material obtained by grinding up waste tires, principally by using heat on the waste tires, and this recycled material contributes to major savings and recycling of resources. In the past, regenerated rubber powder had large particle size, and blending with rubber resulted in degraded physical properties?this meant that it was difficult to use in tires. However, Yokohama Rubber established blending technologies that control physical degradation with compounds of fine powder grade, and commenced mass production of tires made from a compound of this regenerated rubber from February 2009. Over the past five years, the volume of regenerated rubber used by the Yokohama Rubber Tire Group has grown by around 2.9 times since 2008.
Usage ratio of regenerated rubber in all Yokohama Rubber products*1
Initiatives to expand usage, and development of new technologies
We are newly establishing and expanding overseas plants, and we plan to produce tires incorporating regenerated rubber, further developing the effective usage of recycled materials.
High-rigidity wind sealant
Recycling activities in the MB business
The resin mold material (thermoplastic resin) used in hose manufacturing can be crushed and melted down again after use; however, in the past the powder generated in the crushing process has normally been discarded as waste. By introducing a two-stage crushing process, the crushed particles can be kept at a larger size in the first stage, controlling the generation of powder.
The powder generated in the next stage of the crushing process can be collected and reused with the same level of traceability as the larger crushed particles.
As a result, a recycling rate of over 90% has been achieved, and the annual usage of resin mold material has been reduced by 3.6 tons.
Yokohama Rubber Nagano Plant received the JEMAI Chairman's Award for metal scrap briquetting
The Nagano Plant manufactures joint fittings for hoses and assembles hoses and fittings. It has developed an effective system to contribute to resource recycling, in which the metal scrap powder generated during the production of metal fittings that had been sold to an external metal scrap supplier is briquetted for steel raw materials (solidified into a specific shape by hardening the powder with high pressure) for direct sales to steel companies.
A key issue is correctly assessing whether the use of reusable products and recycled materials is leading to a reduction in the use of the Earth’s resources and the environmental impact, and to deploy these assessments on a global level.