Pagina 12 - Ti_News_january2013_9

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Ta g h l e e f I n d u s t r i e s N e w s
12
High barrier EXTENDO™
Lidding Films for Modified Atmosphere Packaging (MAP)
High Barrier flexible packaging in combination with modified
atmosphere or vacuum is one of the most successful and
cost-efficient solutions to extend the shelf life of food
products. With fast growing segments like ready-to-eat
and processed foods, finding such technology is the ideal
packaging solution.
If we look at MAP in combination with flexible packaging
films, we can distinguish among the following technologies:
Thermoform-fill-seal and preformed tray and lidding
film
Horizontal and vertical form fill seal
In this issue of
Ti
’s newsletter we will focus on the Tray and
Lid technology where the machines produce packaging
formed by a semi-rigid tray hermetically sealed by a flexible
lid material. Air is removed by vacuum and replaced with
a mixture of gases, whose composition varies according to
the product packed to selectively meet the preservation
requirements of specific food. The semi-rigid tray can
either be thermoformed in-line with the filling and sealing
operation, starting from a flat sheet (thermoforming), or
made off-line with thermoforming or injection molding
technology. In this application, the role of packaging is to
make sure that the mix of gases remains within the pack and
that outside air does not enter it.
Key material properties are:
Gas barrier
Compatibility with food
Capability to stand packaging and distribution process
Transparency
Strong and hermetic seal
Appeal for the consumer
Most common polymers used for the trays include:
PE, PP (in combination with a barrier polymer, i.e. EVOH)
APET (in combination with EVOH and PE to provide
higher barrier and seal ability)
EUROPE
Typical lidding filmic structures are laminates consisting
of a barrier substrate and a sealing web:
BOPET+PE
BOPET+PE/PP(with and without EVOH)
BOPET coated + PE/PP
PA or BOPA + PE/PP
Thanks to proprietary multilayer extrusion and sequential
orientation technology, EXTENDO™ solutions for lidding
offer possibilities for:
Replacement of barrier laminates with a heat sealable
barrier monofilm, transparent:
EXTENDO™ XLDM (PE-
sealant) and EXTENDO™ XLMH (PP-sealant). Both films
provide high transparency and gloss, tight seals and excellent
drum effect and can be used directly, without additional
converting
Replacement of mixed laminates with mono-material,
fully recyclable PP laminates:
EXTENDO™ XTMH (OTR <
15cc/m2/day) and EXTENDO™ XTMU (OTR < 3cc/m2/day)
can be laminated to peel cast PP to protect print, improve
puncture resistance and achieve easy opening.
www.ex-tendo.com
THE BARRIER FILM COMPANY
PRODUCT FOCUS