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Figure 8.17 Liquid packaging cartons.
Several styles of liquid pack were subsequently developed. Most were filled
through a full aperture top which was subsequently closed and sealed. The
cross sections were square, rectangular or circular with the sides tapered. They
were supplied to the packaging machine either as flat blanks for erection or as
nested premade containers ready for filling. PE replaced wax from the 1950s
and an additional development led to a reel fed form/fill/seal approach with the
tetrahedral shaped Tetrapak.
A range of shelf life times are possible depending on how the product is processed prior to filling, the filling conditions, and the conditions of distribution.
Products could, for example, be pasteurised prior to filling, the product could
be filled hot or the product could be UHT sterilized and filled into a sterilised
pack, i.e. aseptically packed. An appropriate paperboard laminate would be
selected to maintain quality for the period of the required shelf life.
For fresh products, e.g. milk, with a short shelf life in chilled distribution,
i.e. 0–4°C, a two side PE coated paperboard is used. For a long shelf life in
ambient temperature distribution for hot-filled products and for fresh juices in
chilled distribution, the barrier of the laminate is extended by a thin layer of
aluminium foil. In this case the lamination would comprise PE/paperboard/PE/
aluminium foil/PE.
The aseptic packaging process whereby a sterile product is filled into sterile
containers and sealed under sterile conditions has been described by the Institute of Food Technologists as ‘the most significant food science innovation of
the last 50 years’.
This process has been successfully applied to paperboard liquid-packaging
to extend shelf life at ambient temperatures. The pack requires the use of the
PE/paperboard/PE/aluminium foil/PE laminate. Aluminium foil may be replaced
by EVOH, an excellent oxygen barrier, and more easily handled in the domestic
waste stream.
The overall result of these packaging, processing and distribution alternatives
is that a wide range of liquid-food products are now available in paperboard