page_title: Smoked salmon
section_title: Retort pouch
hierarchical_section_title: Smoked salmon / Packaging / Retort pouch
caption_attribution_description: English: Common retort pouch packaging layers.
context_page_description: Smoked salmon is a preparation of salmon, typically a fillet that has been cured and hot or cold smoked. Due to its moderately high price, smoked salmon is considered a delicacy. Although the term lox is sometimes applied to smoked salmon, they are different products.
context_section_description: Cooking low-acid food items in a retortable pouch is a relatively new process, with the first commercial use of such retort pouches found in Italy in 1960, Denmark in 1966, and in Japan in 1969. It consists of enclosing the fish in "a multilayer flexible packaging consisting mainly of polypropylene (PP), aluminum foil, and polyester (PET)" instead of the metal can or glass jar used in canning; but from there the technique is quite similar.  Four different retort pouch structures were used; namely cast polypropylene (CPP), polyethylene terephthalate (PET)/silicon oxide-coated nylon/CPP (SIOX), Aluminum oxide-coated PET/nylon/CPP (ALOX), and PET/aluminum foil/CPP (FOIL).
caption: Common retort pouch packaging layers.
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