The materials the Bridgestone Group currently uses in its products can be classified into three categories: renewable materials, non-renewable materials, and recycled materials. In addition to reducing raw material consumption, the Group is promoting the reuse of resources, use of recycled and renewable raw materials toward the goal of using “100% sustainable materials” as the long-term environmental vision for 2050 and beyond.
The Bridgestone Group is developing a global retread service in which it collects worn out tires from customers, replaces the worn tread, and delivers tires that are again ready for use. Retreading tires can contribute to improved resource productivity and reduced CO2 emissions. Based on the premise that Bridgestone retreaded tires are used three times by a customer, versus the use of three new tires raw materials used and CO2 emissions generated during the entire life cycle, excluding the use phase, can be reduced by half. By providing solutions that combine multiple retreads based on the Group’s unique technology, Dan-Totsu Products, and appropriate maintenance, the Group maximizes the asset value of tires, as well as provide social and customer value of safety, cost efficiency, productivity and environmental sustainability.
Retread tires reuse the resource of tires casing by replacing the worn tread rubber (areas that come into contact with the road surface). Retread tires use less than one-third the amount of raw materials used in new tires and enable the reuse of other tire components (casing). The retreading solution significantly contributes to the reduction of discarded tires as well as the reduction of waste in communities.
* Calculated a case of TBR General tyres (275/80R22.5) based on “Tyre LCCO2 Calculation Guidelines Ver. 3.0.1” (The Japan Automobile Tyre Manufacturers Association, Inc., December 2021)
The Bridgestone Group has been developing retreads for aircraft tires since 1955. Today, the Group provides customers worldwide with products and services that excel in environmental performance, safety and economy from its five retreading plants around the globe.
While meeting the stringent performance requirements of aircraft manufacturers, the Group designs aircraft tires so that they can be retreaded after use. The tires are returned when standard wear and tear are observed due to repeated takeoffs and landings and are retreaded at the Group retreading plants. The tread of main wheel bias tires of an aircraft typically wears out after about 200 takeoffs and landings, while the tread of main wheel radial tires typically wears out after about 350 takeoffs and landings*1. In general, bias tires may be retreaded up to 6 times and radial tires up to 3 times, which means each tire can potentially make a total of about 1,400 takeoffs and landings during its product life*2.
The Group inspects returned tires on a number of requirements across the retreading process to deliver to its customers only retreaded tires that have successfully passed non-destructive testing at the final inspection. These retreaded tires provide the same product performance and meet the safety standards as new tires.
Carrying cargo or passengers, trucks and buses are the lifeblood of the world’s economy. Bridgestone is continually developing new innovative technology for truck and bus tires. With a full line-up of tires tailored to nearly every commercial-use application, it provides high levels of safety, reliability, and cost-effectiveness for highway, city, on and off-road, and winter driving conditions. The M800 series of truck and bus tires is designed to maintain high durability in casing and can be retreaded twice*1.
The Group has launched the EVERTIRE INITIATIVE, a program to create a future in which tires are recycled to create new tires – not as waste tires or end-of-life tires – but as tires that are returned to rubber and other raw materials and recycled as EVER (always, forever, and everlasting) tires. Starting with the following activities, the Group will accelerate co-creation under EVERTIRE INITIATIVE, an activity toward a sustainable future where recycled tires are the standard.
Bridgestone and ENEOS Corporation launched a joint research and development project aimed at the successful development of “chemical recycling technologies that enable precise pyrolysis of used tires.”*1 Synthetic rubber is one of the primary materials used when producing tires and, today, is generally produced from petroleum. Used tires are mainly utilized as fuel in Japan, but to reduce CO2 emissions generated in this method, it becomes increasingly important to circulate tires in a process that emits less CO2, rather than burning them.
In this joint project, the companies will engage in demonstration projects that achieve high-yield production of chemical products, such as butadiene, a raw material used in synthetic rubber. The large-scale demonstrations will be advanced toward 2030 with the goal of achieving mass production and swift commercialization.
The companies will maximize the advanced rubber and polymer material design technologies the Bridgestone Group has cultivated through its tire and rubber business with the crude oil refining technologies and basic chemical product manufacturing technologies of ENEOS. Together, Bridgestone and ENEOS, as leaders in the tire and rubber industry and the petroleum and petrochemicals industry respectively, are working to increase resource circulation and reduce CO2 emissions across the value chains of their industries.
To highlight a related development, Bridgestone is collaborating on a project with the National Institute of Advanced Industrial Science and Technology (AIST), Tohoku University, with partners ENEOS and JGC HOLDINGS CORPORATION, to co-create chemical recycling technologies for high-yield production of isoprene, a raw material used in the production of synthetic rubber, by decomposing used tires with a specialized catalyst.*2 By combining the expertise and technologies of industry leading companies and academic institutions, Bridgestone is working to develop innovative recycling technologies that will contribute to the realization of a more sustainable society and to conduct demonstrations for the social implementation of these technologies by 2030.
These two projects have been adopted by the New Energy and Industrial Technology Development Organization (NEDO) as part of its “Green Innovation Fund*3 / Development of Technology for Producing Raw Materials for Plastics using CO2 and Other Sources Projects” with a project scale of 24.10 billion JPY and approximately 16.45 billion JPY in funding. This will support their ongoing research, demonstration testing and commercialization.
With its co-creation partner LanzaTech NZ, Inc., a carbon capture and transformation company, the Bridgestone Group seeks to develop a new business model that will create a post-consumer waste management strategy for end-of-life tires, while also driving increased adoption of sustainably sourced chemicals for commercial applications.
Applying LanzaTech’s carbon capture and gas fermentation process to used tires yields sustainably produced chemicals such as ethanol that can be converted to materials like PET for packaging, polyester yarn and surfactants used in consumer goods like laundry detergent. In addition, the Group and LanzaTech are jointly exploring proprietary microbe technology to identify more efficient pathways to produce butadiene, a key ingredient in new tire production.
Together with LanzaTech, the Group will lead the way toward tire material circularity and the decarbonization of new tire production and contribute to the realization of a sustainable society.
In partnership with Delta-Energy Group, a market leader in tire material recovery, Bridgestone Americas (BSAM) has begun using recovered carbon black (rCB) in manufacturing new high-quality tires for agriculture and passenger vehicles in Des Moines, Aiken County and Cuernavaca.
Delta-Energy’s proprietary rCB product, D-E Black, partially replaces virgin carbon black, which is a material whose global demand and consumption is increasing and is made from petroleum products using a combustion process. D-E Black is produced from end-of-life tires using its patented DE Polymerization Process, which emits 81 percent less CO2 per ton compared to virgin carbon black. Since 2017, BSAM has procured over 1,800 tonnes of recycled carbon black for use in the tire manufacturing process. BSAM is continually assessing new opportunities to expand the use of D-E Black in new and existing products.
Michelin and Bridgestone delivered a joint perspective on advancing sustainability in the tire industry at the Smithers Recovered Carbon Black Conference in 2021.The presentation focused on increasing utilization of recovered carbon black in tires and the environmental benefits of this more sustainable material. Bridgestone and Michelin issued a call to action to establish a coalition of a diverse group of stakeholders, including tire manufacturers, carbon black suppliers, pyrolysis partners and emerging technology startups to accelerate progress and increase supply of recovered carbon black.
The Bridgestone Group’s Air Free Concept has a unique structure of spokes stretching along the inner sides of the tire that support the weight of the vehicle. With this technology, there is no need to periodically refill the tires with air, resulting in less tire maintenance, improved safety and eliminating the worry of tire punctures.
The spoke structure is made of resin*1 and, along with the rubber in the tread portion, the materials used in the tires are recyclable, contributing to the efficient use of resources. The Bridgestone Group believes that it is possible to achieve even higher levels of environmental performance by developing lower rolling resistance and reducing CO2 emissions using proprietary technologies. Through technological development, the Group aims to achieve a cradle-to-cradle process that proactively maximizes the cyclic use of resources from worn tires into new tires and the use of recyclable resources.
Recycling aluminum scrap is another major initiative to reuse solid waste. In collaboration with an aluminum alloys manufacture company, Tire Mold Thailand (TMOT) has begun recycling 100 percent of aluminum scrap and reusing recycled aluminum ingots in mold manufacturing process for tires. In 2020, TMOT recycled and reused 178 tonnes of aluminum.
Sustainability
