Paper Technology International 2024 - Journal - Page 109
Customized Barriers barrier solutions: studying the
combination of multiple coatings to improve Heat-Sealing
properties:
We found the performances of Cartaseal OGB F10 to
provide superior oil & grease to most existing water based solutions.
However, its chemical nature affects its sealing capabilities and
sealing is a needed property for many applications such as paper
cups, ice cream boxes or stand up pouches.
Here, we will introduce the concept of combining Archroma’s
products to create a multi-purpose barrier solution.
One of the coatings developed by Archroma for heat-sealing
application, Cartaseal SWF has limited grease resistance.
Therefore, we have tested the combination of those
two coatings and check the effect it would have on heat sealing
characteristic as well as barrier performance.
In the table above we show the results of the sealing tests
done with various ratio of Archroma’s Cartaseal OGB F10 overcoated with Cartaseal SWF:
Conditions:
•
Dwell Time
= 333ms
•
Dwell Pressure = 3bars
•
Temperature = 250°C
•
Cooling time = 5 sec
As we can see the best combination to achieve heat sealing
properties is to apply 5gsm of Cartaseal® OGB F10 and 4gsm of
Cartaseal SWF as a topcoat.
While this approach demonstrates the possibilty to create
a heat-sealing coating, we needed to check the impact it could
have on the Oil and grease performance to ensure we aren’t
compromising one bene昀椀t for the other.
The table below is showing the KIT performance with
different combination of Cartaseal® OGB F10 and of Cartaseal
SWF.
This analysis shows the initial barrier performance of
Cartaseal OGB F10 is not affected by the addition of a Heat
Sealable top coat such as Cartaseal SWF.
CONCLUSION:
Consumers and brand owners are pushing the packaging industry to develop alternative solutions to plastic with paper often serving
as the default choice due to high recyclability rates and cost competitiveness. However, the low resistance to oil and grease is a natural
limitation and needs to be overcome for paper to be a viable long-term solution for brands.
While the most performing barrier solution on the market are either based on PE 昀椀lm or 昀氀uoro based coatings, it is crucial to develop
safer and more sustainable solutions in the short term.
The study we shared proved that water-based solution providing excellent barrier to oil and grease are available. Based on the
partnership with many customers, Archroma knows that it is dif昀椀cult to develop a single one-昀椀t-all solution. As it has been shown in the
presentation, it is often the ideal approach is to combine chemistries based on the application and performance requirements to achieve a
winning solution that meets technical and market speci昀椀cations.
It is necessary to develop products with minimal environmental footprint. Archroma is committed to developing barrier solution based
on renewable raw material. The consumer push for this type of solutions is growing all over the world, that is why Archroma will intensify
the development effort in this direction and will continue to push the boundaries and increase the share of bio based raw material in future
barrier coatings.
¹Source: Smither Pira “The Future of Functional and Barrier Coatings for Paper and Board to 2028”
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