Protact is a material for peel-off end rings on canned foods that offers superior performance over heat seal lacquers. It has a 100% polypropylene coating that forms a stronger bond with retort packaging membranes compared to lacquers. This allows Protact end rings to better withstand the pressures of high-temperature food sterilization while maintaining easy opening properties. Protact also has benefits like a wider heat sealing window for higher production speeds and yields, as well as reduced risks of seal failure.
2. Protact in combination with
Alcan Packagings Alufix速
Retort membrane provides
an outstanding bond to
withstand the challenging
pressures of continuous
retorting while keeping the
excellent peel properties
The modern and fresh appearance of
peel-off ends (POEs) conveys a top-of-
the-line image. Peel-off ends help build
brand differentiation. With printing and
embossing, the peel-off end delivers real
stand-out on the shelf. This enables
brand owners to pursue market growth
within the canned food sector.
Protact, with its superb qualities and
excellent performance, is the material
of choice to meet the high requirements
for peel-off end rings. Being suitable
for both counterpressure and non-
counterpressure continuous retort
systems, using Protact opens up a
huge variety of markets like vegetables
and soup.
Large pressure differences can develop
during continuous heat processing of
canned foods. Only Protact offers the
capability to produce POE rings capable
of tolerating these extreme conditions.
The secret lies in the combination of the
100% polypropylene coating, which
has excellent adhesion with the steel
substrate. Furthermore, the elasticity of
the polymer on polymer bond with the
membrane is only achievable with Protact.
This is confirmed by Alcan Packaging,
producer of aluminium membranes.
Protact in combination with Alcan
Packagings Alufix速
Retort membrane
provides an outstanding bond to
withstand the challenging pressures
of continuous retorting while keeping
the excellent peel properties,
comments Andreas Ziegler, responsible
for product development.
Protact速
for peel-off end rings
Protact速
for peel-off end rings
The high performance material
for tough retort applications
3. Protact速
a new dimension
peel-off end rings made from Protact add
a new dimension to manufacturing
convenience.
Protact has a 100% heat seal coating
layer of polypropylene of consistent
thickness. It is this PP-layer that offers
several benefits for manufacturing,
processing and the performance of
the ends, compared to alternative
heat seal options.
As the convenience packaged food
market rapidly expands, so does the
demand for peel-off ends. Be sure to
choose the best material option
available for the ring!
Find out how Protact can give you a
competitive edge in the fast growing
convenience food packaging sector.
We will be pleased to talk to you in more
detail about all the benefits of Protact.
Optimised heat-sealing processing
Wider operating window
Higher yields
Increased output
Higher resistance to variations during sterilisation
Compatible with modern printed multi-layer membranes
High performance ends
Fully retortable
Superior seal integrity
Higher level of security
Excellent food safety
Consistent ease of opening
Improved overall pack performance
Available in a range of colours
Range Properties
Internal coating PET 15袖m clear Chemical resistance
(Polyethylene Terephthalate) Low taint & flavour scalping
Excellent moisture barrier
External coating PP 25袖m white, clear, gold Heat sealable
(Polypropylene) Fully retortable
PP 40袖m clear Good chemical resistance
(Polypropylene)
Steel 0.17 0.21 mm ECCS/TFS Other gauges on request
Our PP coatings are optimised for heat sealability to all commercially available membranes
and for double seaming operations.
The internal PET coating makes Protact a trouble-free, high performance packaging
material in contact with food.
Recommended specifications Protact速
for peel-off end rings
Protact速
for peel-off end rings
4. Optimised processing
Wider operating window
for heatsealing
During processing the operating window
of Protact is much wider than that of
heat seal lacquered material. For fixed
tool pressure the range of temperatures
at which a satisfactory seal is produced
using Protact, is significantly wider than
lacquered material at all speeds.
This is especially significant at higher
speeds where temperatures must be
accurately controlled. Protact therefore
offers can makers a much more robust
processing operation with subsequently
much higher yields.
Also the heatsealing time of peel-off
membranes to Protact rings can be
significantly reduced thanks to the
100% polypropylene coating of Protact.
This offers can makers the potential to
significantly increase output.
High resistance to variations
during sterilisation
Peel-off ends with a ring made
of Protact are more resistant to
temperature, time and pressure
variations throughout the retort
process. This gives fillers and
brand-owners an efficient filling
process: more filling options, a
reduction of operational risks during
retorting, a significant reduction of
the risk of premature bursting of the
seals and thus a lower rejection rate.
Enables lower cost membrane options
Lower sealing temperatures can be
utilised with Protact. Not only does this
save energy costs, it potentially also
enables the use of modern printed
multi-layer membranes.
Key
Heat seal lacquer operating window
Extra operating window with Protact速
0.0
200 225 250 275
Seal
Time(s)
Protact速
Heat seal
lacquer
Seal Temperature (尊C)
0.1
0.3
1.0
Example of Protact速
operating window
0.2
5. High performance ends
Superior seal integrity
Seal integrity is one of the most
important aspects in food packaging.
A seal needs to be tight during
sterilisation and later on the shelf.
A higher level of security is achievable
through the use of Protact. Due to the
100% polypropylene bond between
Protact and the membrane the seal
integrity of Protact is superior to that
of heat seal lacquers. When heat seal
lacquers are used, the bond is not
continuous, as a polypropylene
dispersion in epoxy is used to seal
to the membrane. With Protact the
seal integrity is simply superior, with
associated reduced risk of inadequate
seals being produced.
Enhanced corrosion
protection with Protact
The retort curl is effectively protected
against corrosion by the combined
benefits of Protact. The polymer
coating is flexible and formable,
enabling total protection in the critical
highly formed curl area.
Consistent ease of opening
The superior seal integrity of peel-off
ends with a Protact ring does not mean
the ends are more difficult to open.
On the contrary, the ease of opening
is comparable to that of heat seal
lacquered rings.
Excellent food safety
Protact fully complies with EU and
USA food contact legislation. Protact
does not contain PVC or Bisphenol-A
nor BADGE.
Improved overall pack performance
Packs made with peel-off ends utilising
Protact exhibit superior seal integrity
and therefore inherently offer longer
shelf life.
Colours
Protact is available in a range of colours
including clear, gold and white.
PP particles
for heatsealing properties
Main epoxy coating layer
Adhesion layer
Substrate
basic metal properties
Heat seal lacquered material
Protact速
for peel-off end rings
Protact速
for performance
Peel-off ends with a Protact速
ring offer the remarkable
performance of a unique polypropylene (PP) bonding system:
Strong 100% bonding
Fully retortable
Superior seal integrity
Easy opening
PP top layer
for heatsealing properties
Main PP coating layer
for heatsealing and colour
PP adhesion layer
Substrate
basic metal properties
Protact速
Sealed area of Protact ring: no voids due to
the 100% polypropylene coating
Sealed area of heat seal lacquered ring:
showing voids
6. www.coruspackaging.com
Protact速 is a registered trade mark of Corus.
Care has been taken to ensure that this
information is accurate, but Tata Steel UK
Limited does not accept responsibility or
liability for errors or information which is
found to be misleading.
Copyright 2008
Corus
Corus Packaging Plus
Dudok House 3H16
PO Box 10.000
1970 CA IJmuiden
The Netherlands
T: +31 (0) 251 493 186
F: +31 (0) 251 470 051
info@coruspackaging.com
Protact A0908