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Three layers are used to make the pouch. A 4-mil outer clear top ply is an adhesive lamination of DuPont Canada’s nylon with a PP-based film produced by Alcan Packaging. The middle ply, also from Alcan, is a PP-based multilayer coex perforated for permeability; it contains an autoclavable peelable seal feature that activates after steam sterilization. The outer bottom ply is a spunbond-meltblown-spunbond nonwoven sheet from BBA Fiberweb; it allows permeation of sterilization gases while it also provides a barrier to bacterial penetration. Cardinal Health Care converts the material into a three-side-sealed pouch that it sells to the hospital and dental markets.
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