Comparison of EVOH

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Comparison of EVOH PETMET Films
Smurfit Bag-in-Box
Barrier Films Co-extruded EVOH film and
Polyester-Metallised film for Bag-In-Box
application
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Smurfit Bag-in-Box
Comparison of EVOH PETMET Films
Structure of EVOH
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Comparison of EVOH PETMET Films
Smurfit Bag-in-Box
Coextruded EVOH Film Manufacture
Reels of coextruded film
Binding (PE based) agent
Polyethylene
Bubble
EVOH
Polyethylene
Blowing
Heating
EVOH
Polyethylene
Binding agent (PE)
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Comparison of EVOH PETMET Films
Smurfit Bag-in-Box
Structure Manufacture of Metallised Polyester
(METPET) - First Part Metallization -
Reel of Polyester/polyethylene (Co-extruded film)
Reel of Polyethylene Metallised polyester
Cooling cylinder
Aluminium vaporization under vacuum
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Comparison EVOH METPET
Smurfit Bag-in-Box
Structure Manufacture of Metallised Polyester
(METPET) -2nd Part lamination
Reel of Polyethylene Film
Reel of Polyester Metallised Polyéthylène
Adhesive agent
Reel of Polyethylene Metallised Polyester Film
laminated with Polyethylene Film
Binding Cylinder
Adhesive agent
Reel of Polyethylene film
Binding Cylinder
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Smurfit Bag-in-Box
Comparison EVOH et METPET Films

• EVOH Film is made through a co-extrusion process
  that links the polyethylene,
• the Tie Layer (modified PE) at the same time.
• This means that the polyethylene and EVOH are
  extruded simultaneously.
• Due to that, the cohesion of this two materials
  is excellent.
• Metallised Polyester Film is made by lamination,
  
• The process requires three stages. We need to get
  first three films made by extrusion
• (2 polyethylene films and the polyester film
  independently)
• Then we have the vacuum-metallization of the
  aluminium on the polyester layer.
• This operation is very delicate because a very
  poor layer of aluminium is deposing
• on the film. This thin deposit is very fragile
  and can break very easily.
• The last stage consists of laminating these tree
  layers by sticking them together
• with some adhesive this operation is delicat and
  can be critical to the quality
• of the film.

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Smurfit Bag-in-Box
Comparison EVOH et METPET Films
CHARACTERISTICS OF BARRIER FILMS FOR BAG IN BOX
Dynamic perforation resistance
Elongation Properties
Food contact agreement
Oxygen Barrier
Antistatic Properties
Sealing Properties
Flavour Barrier
Oxygen Barrier after transport
Seal Strength
Temperature Resistance
Multilayer
Sliperiness
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Comparison of EVOH PETMET Films
Smurfit Bag-in-Box

• Mechanical characteristics

No transport
After 400 Gelboflexes ( 400km)
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Smurfit Bag-in-Box
EVOH film is a flexible film. All the elements
of the structure are polyethylene and all
therefore are soft when compared to polyester.
In addition, the oxygen barrier of the film
comes from an EVOH copolymer which is an extruded
layer in the film, rather than a layer of metal
randomly deposited onto a film. As a result of
the flexibility of the film and the
manufacturing process of the barrier layer, the
film is very resistant to the rigours of
transportation and the flex-cracking of the
film which can result. It is this flex-cracking
of film which at its worst leads to pinholing in
the film and leakers. Whilst the oxygen
permeability rate of a piece of virgin EVOH may
be slightly higher (say 1.2 cc compared to 1
cc/m²/day) than metallised polyester
laminate, laboratory tests, pallet vibration
tests, transportation tests and many years of
experience show EVOH film to be more resistant to
flex-cracking than metallised polyester
laminate, particularly over long
distances. Attached are two charts showing the
results of some laboratory work which give an
indication of how EVOH film compared to
metallised polyester laminate when subjected to
flex-cracking.
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Comparison of EVOH PETMET Films
Smurfit Bag-in-Box
Influence of Gelbo Flexing on Oxygen Transmission
Rate
(100 Cycles 80 km)
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Comparison of EVOH PETMET Films
Smurfit Bag-in-Box

• The following curves show the results of a study
  made by the  Institut coopératif du vin de
  Montpellier  and the Institut Œnologique de
  Champagne.
• So2 Levels (Free Total) has been analysed on
  bag-in-box made with the same inner ply, and a
  different outside linner (EVOH PETMET) filled
  with red wine, either tranported or not.
• These analyses reflects the level of the wine
  oxydation.
• N.B. You will notice that analyses made on
  transported are more heterogeneous due to
  mechanical alterations.

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Comparison of EVOH PETMET Films
Smurfit Bag-in-Box
Influence of different barrier Films on SO2
Levels (No transport)
Total SO2
Free SO2
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Comparison of EVOH PETMET Films
Smurfit Bag-in-Box
Influence of different barrier Films on SO2
Levels (With transport)
SO2 Total
SO2 Libre
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Comparison of EVOH PETMET Films
Smurfit Bag-in-Box
Various

• MET- PET
• 1) Opacity/ metal aspect
• can protect un-packed bag-in-box from light
• Can  hide  the product inside the bag
• Can Give a  richer  aspect
• 2) Environment
• Waste can be incinerated, but it should be done
  in a smokeless (toxic gazes) incinerator to
  ensure complete combustion
• Metal wastes in the ashes

• EVOH
• 1) Transparency
• No foreign body
• No trapped air
• Can check for discolouration and any quality
  defects in the product.
• 2) Environment
• Waste can be incinerated (No toxic gaz emission
• No metal presence in the ashes

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Comparison EVOH et METPET Films
Smurfit Bag-in-Box
Point on Primary aromatic amines (New 20001/62/EG
Amendment to the 90/128/EG Directive)
Our Films in contact with the products fulfill
the actual EEC/FDA regulations

• N.B.
• Recent reports in the Danish Press has focus
  attention on the levels of Primary aromatic
  amines (PAAs) in multi-layer flexible laminates.
• Aromatic amines (which seem to be linked to
  cancer) can be produced when any isocyanates
  (used in some Polyurethane based adhesive) react
  readily with moisture or any residual alcohol
  solvents from printing inks
• Sixth amendment (2001/62/EEC) to 90/128/EEC
  directive has introduced a limit of 20mg/kg
  foodsttuff for PAAs.
• ?Polyurethane is never used in the process of
  co-extruded film (EVOH film)
• ? Some laminating Processes are using adhesive
  with high levels of isocyanates.