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.
Ref.1:
Calculation Assumptions by Sustainable Management Promotion Organization
(SuMPO).
- Film substrate and packaging process are not
included in this calculation since there is no difference in-between
water-based flexo printing and solvent gravure printing at them.
- This calculation is done by 5 colors printing.
- Plate making processes are: water washable plate
technology for flexo printing, electronic engraving technology for gravure
printing.
- Utility data at printing machine is based on
typical and theoretical data on product catalogue since actual utility can be
fluctuated as per actual printing condition and environment.
- Printing speeds are: water-based flexo
200m/min., solvent gravure 150m/min.
- Disposal method of printing wastages are: water
disposal at water-based flexo, incineration at solvent gravure.
- Plate sleeve at flexo printing and steel
cylinder at gravure printing are part of printing machine and not included in
this calculation.
- Proofing process is not included in this
calculation.
- GHG emissions of ink manufacturing are based on
published data of Japan Printing Ink Makers Association.
- Transportation of intermediates and wastage are,
500km for intermediates, 100km for wastage respectively.
- LCI Database IDEAv2.3 is used.
For more information about flexographic solutions
from Asahi Photoproducts that are in harmony with the environment, visit
www.asahi-photoproducts.com.