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287
ACTIVE PACKAGING
High-barrier lid
®
OXYGUARD tray
O2
O2
O2
Inside
O2
Heat sealable layer
Oxygen absorbing layer
Barrier layer (EVOH)
Protect layer
Outside
O2
O2
O2
O2
O2
Figure 9.1 Structure of Oxyguard™ tray (courtesy of Toyo Seikan Kaisha Ltd).
activated ZERO2™ oxygen scavenger materials (developed by Food Science
Australia, North Ryde, NSW, Australia and now partly owned by Visy Industries,
Melbourne, Victoria, Australia) are just three of many oxygen scavenger
developments aimed at the beverage market but are also applicable to other
food applications (Rooney, 1995, 1998, 2000; Castle, 1996). It should be noted
that the speed and capacity of oxygen scavenging plastic films and laminated
trays are considerably lower compared with iron based oxygen scavenger
sachets or labels (Hirst, 1998).
More detailed information on the technical requirements (i.e. for low,
medium and high aw foods and beverages; speed of reaction; storage temperature; oxygen scavenging capacity and necessary packaging criteria) of the
different types of oxygen scavengers can be obtained from Labuza and Breene
(1989), Idol (1993), Rooney (1995, 1998, 2000) and Hurme and Ahvenainen
(1996).