Packaging laminate with gas and aroma barrier properties

A preformed package blank comprising:

• a flexible laminate having a first layer of SiO.sub.x formed by plasma-enhanced vapor deposition, in which x is within the range of between 1.5 and 2.2, and a second layer of a flexible thermoplastic material to which the first layer is bonded, said laminate having crease lines to facilitate folding of the laminate, said first layer being deformed by said crease lines, and means for sealing said laminate when folded to form a sealed container for perishable food products.

A packaging laminate for making containers having good gas and aroma barrier properties, comprising:

• a base layer of paper, paperboard, or thermoplastic;
• and
• a barrier layer having a thickness of between about 50 and about 500 angstroms, said barrier layer being applied on the base layer by plasma enhanced chemical vapor deposition, and the barrier layer consists essentially of a silicon compound of formula SiO.sub.x in which x is within the range of about 1.5 to 2.2

A packaging laminate for making containers having good gas and aroma barrier properties, comprising a plurality of layers, one of said layers being a barrier layer having a thickness between about 50 and about 500 angstroms, another of said layers being a base layer, said barrier layer being applied on the base layer by plasma-enhanced chemical vapor deposition and consisting essentially of a silicon compound of formula SiO.sub.x in which x is within the range of about 1.5 to 2.2, at least one of the layers being on the outside of the laminate and being heat sealable at a temperature between about 250.degree. F. and 500.degree. F., said base layer being a polyester.