Glossary · Packaging

Heat seal

The thermally bonded edge of a flexible pouch. A weak or inconsistent heat seal is a common failure point that defeats an otherwise good barrier film.

Barrier film The multilayer plastic structure used to make freeze-dried fruit pouches. WVTR (Water Vapor Transmission Rate) The rate at which water vapor passes through a barrier film under defined conditions, typically reported in g/m²/day. OTR (Oxygen Transmission Rate) The rate at which oxygen passes through a barrier film, typically reported in cc/m²/day. Metallized film A flexible film with a thin vapor-deposited aluminum layer. Foil laminate A flexible packaging structure built around an aluminum foil layer. Desiccant A small packet — usually silica gel or molecular sieve — that absorbs moisture inside a sealed pouch. Oxygen absorber A packet that chemically removes residual oxygen from a sealed pouch. Headspace The empty volume inside a sealed pouch above the product.

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