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What is “anti-media adhesive” in lamination?

What is “anti-media adhesive” in lamination?  It refers to an adhesive that resists certain substances in the contents of the package, thus meeting the special performance requirements of laminating adhesives.  Specifically, some adhesives have resistance to methanol and propanol substances, some have resistance to aromatic hydrocarbon substances such as toluene, and some have resistance to certain spicy substances and ethyl maltol substances.  


However, it has been shown that adhesives that can resist aromatic hydrocarbons may not necessarily be able to resist ethyl maltol and vice versa.  


Therefore, when choosing adhesives for processing laminating bags with “anti-media” requirements, flexible packaging companies should have a full understanding of the nature of the contents.  In addition, sufficient aging tests must be carried out to verify the anti-media properties of the laminating bag.  The barrier properties of the substrate film, especially the heat-sealing layer film, play an important role in the anti-media properties of the laminating bag.  Delaying the migration rate of permeable substances in the contents to the adhesive layer as much as possible is a problem that must be considered when designing laminating bags with anti-media properties.


In order to improve the barrier properties of the heat-sealing layer substrate, it is ideal to use polyamide (nylon) co-extruded film, EVOH co-extruded film or high-barrier coating.

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