DuPont lidding film with PET-based sealing layer
DuPont has developed a lidding film with a PET-based sealing layer, which directly seals to mono-APET trays. Advantages over traditional lidding films using an LDPE sealing layer include a higher fat barrier, perforation resistance, gloss and transparency.
By eliminating the need for an additional polyolefin-based lamination film on the APET tray, the company says trims can be directly recycled, the bottom web costs can be reduced by up to 40% and the total weight of the tray can be up to 15% lower without loss in stiffness.
The film includes a layer of a printable PA outside, which provides the heat resistance required for contact with the sealing bar. Combined with the relatively low seal initiation temperature provided by the inside layer, this structure allows for direct printing and sealing of the film without the extra production step of laminating to a reverse-printed OPET layer.
The lidding film structure makes it possible to incorporate easy-open behaviour at the interface between the tie and sealant layer.
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