Life cycle assessment (LCA) initiatives

Life Cycle Assessment (LCA) is a method to evaluate all types of environmental impact quantitatively, based on the amounts of resources and energy taken in and waste discharged at each stage of the product life cycle, from material procurement to production, logistics, consumption, recycling and disposal.
To promote determination and reduction of environmental impact, in fiscal 2007, the Citizen Group began considering effective application of LCA with the aim of calculating and applying LCA data in product planning discussions, design changes, production process improvement, and other areas.

Results of LCA Performed on Calculator PrinterCitizen Systems Japan

In fiscal 2007, Citizen Systems Japan conducted LCA on the PA600 calculator printer, marking the first time the company performed LCA on a printer.
The chart below shows data on environmental impact calculated from the perspective of global warming, in each stage of the printer's life cycle from production to disposal.
The results of the analysis show that 93% of total CO2 emissions for the life cycle occur during use of the printer. We will work to mitigate the environmental impact of new products in the development stage under the theme of creating products that consume little electricity during use.

PA600 calculator printer

PA600 calculator printer

CO2Emissions※1

CO2 Emissions

※1 Based on one million lines of print; disposal stage evaluated as land-filling

LCA Results of ThermometersCitizen Systems Japan

In order to investigate the extent of environmental impacts of products produced by the Citizen Group, LCA was implemented for three different models of universal design thermometers.
The graph below show the LCA data on global warming impacts made in each stage of the lifecycle from manufacturing to disposal.
It has become clear that there is a tendency that as improvement of the function of products would increase the number of parts used and structural complexity, larger environmental impacts result.
Efforts are going to be made to look into the plan, design and production process, balancing the convenience of functions with the extent of environmental burden.

  • Estimation thermometers CT786SP

    Estimation thermometers CT786SP

    The flexible tip can fit easily into the body part, and they are equipped with a 30- seconds estimation function that contributes to the shortening of measurement time.

  • Vibration thermometers CT785V

    Vibration thermometers CT785V

    They are equipped with a large liquid crystal display, and an end of measurement is notified by vibration.

  • 実測式体温計 CT782W

    Measurement thermometers CT782W

    They are a standard model with finger knob.

Global Warming (CO2 equivalent)※2

Global Warming (CO2</span> equivalent)

※2 Calculation based on the assumption that one measurement is conducted every 3 days for 5 years. Button battery is used.

Life-Cycle Assessment of Eco-Drive WatchesCitizen Watch

Life-Cycle Assessment of Eco-Drive Watches

We used a preliminary LCA approach to consider the difference between stainless steel and titanium watch exteriors. In this case, we considered the differences starting from the materials production stage and ending at the product manufacturing stage. (Note that the "exterior" consists of the casing, the display, and the band, whereas the "interior" consists only of the movement.)
The graphs below show the impact data of a single watch on global warming, acidification, and energy use. As we move ahead we shall expand our LCA to include product usage, recycling, and disposal stages, as we work to cover the entire life cycle.

LCA Results

LCA Results