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    Expert's Opinion

    Water-based flexo steps up to sustainability challenge

    Significant progress has been made towards reducing the carbon footprint for flexographic printing as compared to gravure.

    Water-based flexo steps up to sustainability challenge
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    Takumi Saito06.30.21
    The recent Leaders Summit on Climate, hosted by U.S. President Biden, demonstrates the growing commitment leaders of many countries have to addressing the climate crisis by reducing greenhouse gas (GHG) among other initiatives. This will likely translate into increased regulatory pressure on a variety of industries, including printing, to moderate their emissions of CO2 and other global warming gases such as CH4 and N2O. As a leading supplier to the flexographic printing industry, Asahi Photoproducts is dedicated to delivering flexographic solutions that are in harmony with the environment. In doing so, the company enables its customers to be proactive in contributing to the overall reduction of GHG emissions

    Over the last half century, Asahi Photoproducts has worked hard to bring innovative solutions to flexography, and most recently with the Asahi AWP CleanPrint water-washable plates. This solvent-free process delivers more sustainable printing while at the same time improving Overall Equipment Effectiveness (OEE) in the press room to the tune of 30% or more, which results in a significant increase in quality due to the precise register these plates deliver.

    What that means for the printing industry is that flexography is now competitive with gravure for all except the longest print runs. To validate this assertion, Flexo Technical Association Japan (FTAJ) and Water-based Flexographic Printing Advancement Council partnered with the Sustainable Management Promotion Organization (SuMPO), a well-known Japanese association, to calculate GHG emissions during the entire printing process for each of these two technologies, using the Life Cycle Assessment method.

    The results were enlightening. We found that when printing a job of 5,000 linear meters with water-based flexographic printing and comparing the result with the simulation of the same job with gravure printing, GHG emissions from water-based flexographic printing can be reduced by about 65% compared to gravure. We measured GHG emissions from the gravure life cycle at 668 kg, whereas emissions from water-based flexography were 231 kg.

    The gravure printing simulation results from using electronic engraving of the cylinders and solvent-based inks, while water-based flexographic printing uses water-washable plates and water-based inks. The results are shown in the image below, broken down into 3 steps: platemaking/engraving, ink manufacturing, and printing.

    The sustainability of the print can be further enhanced by using solvent-free laminating where lamination is required or desired, instead of dry lamination where the bonding agent is dissolved in solvent, applied, and then evaporated in a drying oven. With solvent-free lamination, a low viscosity adhesive is applied, requiring only a heated nip to mate it to the substrate. This creates an additional advantage of solvent-free lamination beyond the reduced GHG and VOC emissions since it does not require a drying component, further reducing energy consumption and increasing its sustainability as compared to the conventional dry lamination process. Thus, we recommend water-based flexographic printing technology combined with solvent-free lamination and water-washable flexographic printing plates as the most sustainable approach to producing packaging.

    All of this demonstrates the significant progress that has been made towards reduction of the carbon footprint for flexographic printing as compared to gravure, and the fact that this approach to packaging printing has the potential to change the global packaging market. But we are not stopping here. The talented and innovative engineers at Asahi Photoproducts continue to seek new ways to reduce the environmental impact of flexographic printing processes even further, and we have full confidence that they will find even more ways to make flexographic printing more sustainable.


    About the author:  Takumi Saito is from Asahi Kasei Corporation's Printing Solutions Project.
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