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Rengo believes an environmentally considerate style of management is essential for sustainable growth, and intends to achieve this through ongoing, companywide initiatives that include promoting utilization of recovered paper, installing energy-efficient facilities, converting to fuels that emit low levels of CO2, and recycling waste.


Eco-friendly Production Systems


25% reduction in CO2 emissions
Rengo is actively introducing energy-efficient facilities and adopting less harmful, clean energy sources, as part of its efforts to reduce CO2 emissions, which have a significant impact on the global environment. In addition to the installation of gas engines that are highly energy efficient, as well as biomass boilers fueled by manufacturing waste, Rengo is also actively converting other boilers from fuel oil to liquefied natural gas (LNG) or processed natural gas, which have a lower CO2 conversion coefficient than fuel oil.
Furthermore, with the adoption of a large-scale photovoltaic power generation system at one of its plants, a first in the corrugated industry in Japan, and other initiatives, as a group Rengo achieved a 24.9% reduction in CO2 emissions for 2013 compared to 1990 levels.
Going forward, Rengo has set group-wide CO2 emission reduction goals of 32% by 2020 and 50% by 2050.

Waste reduction
Trimming waste, the most common type of waste generated by corrugated plants, is recycled back into containerboard at Rengo's paper mills. This contributed to Rengo's 98.0% recovered paper utilization ratio in 2013. Ragger rope shredding and sorting machines have also been installed. These enable ragger rope to be broken up and separated into iron and plastic scrap, whereas it used to be disposed of as waste in the past.

Prevention of air and water pollution
Water is a vital resource used in the production of paperboard. We have long been looking into ways to utilize water effectively at our paper mills, where water is currently used for ten cycles on average. Water that has been used repetitively like this is then returned to a state below maximum regulation levels before being released into river systems. Air pollution prevention measures include converting to clean energy sources as well as working to reduce levels of SOx and NOx through the installation of flue gas desulfurization and denitration systems.
Biomass combustion power generation system
Biomass incineration power plant

Photovoltaic power system
photovoltaic power system

Trimming waste to be recycled
Trimming waste to be recycled

Facility of wastewater treatment
Facility of wastewater treatment