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Table 7.4 Typical current examples
Aluminium type
PET/Oriented PA/Al/CPP
Transparent type
PET/Oriented PA/CPP
Transparent barrier type
SiOxPET/Oriented PA/CPP
PET metallised Al/Oriented PA/CPP
Oriented PA/PVdC/CPP
Oriented PA/EVOH/CPP
Used for small pouches sold in decorated
boxes for curry, sauces, household dishes
Strong pouches widely used (small to 3 kg)
Transparent type pouch rice, chilled
hamburger steak vegetable, fish, dumplings
Highest barrier for transparent pouch
Good transparency type (strip metallised)
Vacuum packaging
High barrier, appropriate for vacuum pkg.
Source: Dai Nippon Printing Co. Ltd. 2002.
These laminates demonstrate a range of barrier properties against oxygen
and moisture vapour. Those without aluminium foil are transparent. The outer
polyester film provides strength and toughness, while the inner PP provides
good heat-sealing properties, strength, flexibility and compatibility with all
foodstuffs. The additional incorporation of an oriented PA (nylon) film layer
further increases the durability of the pouch, especially where the individual
pouches are not, subsequently, packed individually in cartons. AlOx (metallised) coatings are being used to improve barrier, and SiOx provides both high
barrier and pack microwaveability. The layers are laminated to each other
using specially developed thermo-stable, food compatible, adhesives.
Typical thicknesses: PET 12 μm, PA 15–25 μm, Al foil 7–9 μm and CPP at
70–100 μm
Pouches are reverse printed in a wide range of graphics on the PET film
before lamination, so that the print cannot come into contact with the food. All
laminates are required to meet very stringent requirements to ensure no undesirable substances can be extracted into the packaged food.
Retort pouches are used in several countries for a wide range of processed
shelf stable products, from solid meat packs such as polonies to sliced meat in
gravy, high-quality entrees, fish, sauces, soups, vegetables, fruits, drinks and baked
items. Current markets for pouches are:
• Retail packs up to 450 g for home use and outdoor activities. Foil-free
pouches have been utilised particularly for vegetables where high visibility is desirable and a short shelf life from 4 weeks to 6 months is
acceptable. In these instances, oxygen permeability is the overriding