B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 7/02 (2006.01) B32B 27/30 (2006.01)
Patent
CA 2728823
The presently disclosed subject matter is directed to a barrier film (10) that maintains an oxygen barrier after being subjected to autoclaving conditions. The film comprises one EVOH layer (18) positioned as a core layer, and one EVOH layer (14) positioned directly adjacent to an outer layer (12) comprising highly permeable material having a moisture vapor permeabili-ty greater than about 40g-mil/100 in2-day-atm. During autoclaving, the barrier properties of the EVOH layer (12) positioned adja-cent to the outer layer (12) allows improved recovery of oxygen barrier properties. In addition, during rewetting applications the internal EVOH layer (18) maintains the oxygen barrier. Also disclosed are methods of making and using the disclosed barrier film (10).
La présente invention se rapporte à un film barrière (10) qui maintient une barrière doxygène après avoir été soumis à des conditions dautoclavage. Le film comprend une couche EVOH (18) positionnée en tant que couche centrale, et une couche EVOH (14) positionnée directement de manière adjacente à une couche extérieure (12) comprenant un matériau fortement perméable ayant une perméabilité à la vapeur dhumidité supérieure à environ 40g-mil/100 pouce carré-jour-atm. Pendant lautoclavage, les propriétés de barrière de la couche EVOH (12) positionnée de manière adjacente à la couche extérieure (12) permettent un rétablissement amélioré des propriétés de barrière doxygène. De plus, au cours dapplication de réhumidification, la couche EVOH interne (18) maintient la barrière doxygène. Linvention concerne également des procédés de fabrication et dutilisation du film barrière (10) décrit.
Mueller Walter B.
Thompson Patrick W.
Cryovac Inc.
Smart & Biggar
LandOfFree
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