Sealed Air seeks new materials that are compatible with polyethylene (PE) and provide adhesion only when in contact with itself under high pressure.
Some mail pouches are produced from solely from polyethylene. These mailers can be easily reprocessed (recycled). However, the protective strip that covers the envelope flap adhesive is not compatible with a polyethylene melt stream, and certain adhesives may contaminate the recycling stream. Sealed Air would like to identify new adhesives or other closure methods that eliminate the need for protective strips (which pose a litter problem) while preventing inadvertent or unintentional sealing of the mailer flap to itself or adjacent envelopes.
Ideal solutions will be compatible with application to PE, will not require a protective strip over the adhesive, and will allow multiple mailers to be stacked upon one another without them getting stuck to themselves. Sealed Air is only interested in technology that can be immediately demonstrated and is very interested in novel closure approaches.
The following approaches are not of interest:
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