Presentation on theme: "Comparison of EVOH & PETMET Films"— Presentation transcript:
1 Comparison of EVOH & PETMET Films Smurfit Bag-in-BoxComparison of EVOH & PETMET FilmsBarrier Films :Co-extruded EVOH film andPolyester-Metallisedfilmfor Bag-In-Box application
2 Comparison of EVOH & PETMET Films Smurfit Bag-in-BoxComparison of EVOH & PETMET FilmsPoly Ethylene (PE)(CH2)m)nCHOHEthylene Vinyl Alcohol Copolymer (EVOH)Poly Vinyl Alcohol (PVA)ExtrudabilityGas Barrier: C: O: HStructure of EVOH
3 Comparison of EVOH & PETMET Films Smurfit Bag-in-BoxComparison of EVOH & PETMET FilmsCoextruded EVOH Film ManufactureReels of coextruded filmBinding(PE based) agentPolyethyleneBubbleEVOHPolyethyleneBlowingHeatingPolyethyleneEVOHBinding agent (PE)
4 Comparison of EVOH & PETMET Films Smurfit Bag-in-BoxComparison of EVOH & PETMET FilmsStructure & Manufacture of Metallised Polyester (METPET)- First Part: Metallization -Reel of Polyester/polyethylene(Co-extruded film)Reel of Polyethylene Metallised polyesterCooling cylinderAluminium vaporizationunder vacuum
5 Comparison EVOH & METPET Smurfit Bag-in-BoxComparison EVOH & METPETStructure & Manufacture of Metallised Polyester (METPET)-2nd Part: laminationReel of Polyethylene FilmReel of Polyester Metallised PolyéthylèneAdhesive agentReel of Polyethylene Metallised Polyester Film laminated with Polyethylene FilmBinding CylinderAdhesive agentReel of Polyethylene filmBinding Cylinder
6 Comparison EVOH et METPET Films Smurfit Bag-in-BoxComparison EVOH et METPET FilmsEVOH 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 deposingon 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 togetherwith some adhesive: this operation is delicat and can be critical to the qualityof the film.
7 Smurfit Bag-in-Box Comparison EVOH et METPET Films CHARACTERISTICS OF BARRIER FILMS FOR BAG IN BOXDynamic perforation resistanceElongationPropertiesFood contact agreementOxygenBarrierAntistaticPropertiesSealingPropertiesFlavourBarrierOxygen Barrier after transportSeal StrengthTemperatureResistanceMultilayerSliperiness
8 Comparison of EVOH & PETMET Films Smurfit Bag-in-BoxComparison of EVOH & PETMET FilmsMechanical characteristicsNo transportAfter 400 Gelboflexes(= 400km)
9 Smurfit Bag-in-BoxEVOH film is a ‘flexible’ film. All the elements of the structure are polyethyleneand all therefore are ‘soft’ when compared to polyester. In addition, the oxygenbarrier of the film comes from an EVOH copolymer which is an extruded layerin 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 thebarrier layer, the film is very resistant to the rigours of transportation andthe ‘flex-cracking’ of the film which can result. It is this ‘flex-cracking of filmwhich 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 yearsof experience show EVOH film to be more resistant to flex-cracking thanmetallised polyester laminate, particularly over long distances.Attached are two charts showing the results of some laboratory work which givean indication of how EVOH film compared to metallised polyester laminatewhen subjected to flex-cracking.
10 Comparison of EVOH & PETMET Films Smurfit Bag-in-BoxComparison of EVOH & PETMET FilmsInfluence of Gelbo Flexing on Oxygen Transmission Rate(100 Cycles = 80 km)
11 Comparison of EVOH & PETMET Films Smurfit Bag-in-BoxComparison of EVOH & PETMET FilmsThe 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.
12 Comparison of EVOH & PETMET Films Smurfit Bag-in-BoxComparison of EVOH & PETMET FilmsInfluence of different barrier Films on SO2 Levels(No transport)Total SO2Free SO2
13 Comparison of EVOH & PETMET Films Smurfit Bag-in-BoxComparison of EVOH & PETMET FilmsInfluence of different barrier Films on SO2 Levels(With transport)SO2 TotalSO2 Libre
14 Comparison of EVOH & PETMET Films Smurfit Bag-in-BoxComparison of EVOH & PETMET FilmsVariousMET- PET:1) Opacity/ metal aspect:can protect un-packed bag-in-box from lightCan « hide » the product inside the bagCan Give a « richer » aspect2) Environment:Waste can be incinerated, but it should be done in a smokeless (toxic gazes) incinerator to ensure complete combustionMetal wastes in the ashesEVOH:1) Transparency:No foreign bodyNo trapped airCan check for discolouration and any quality defects in the product.2) Environment:Waste can be incinerated (No toxic gaz emissionNo metal presence in the ashes
15 Comparison EVOH et METPET Films Smurfit Bag-in-BoxComparison EVOH et METPET FilmsPoint 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 regulationsN.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.
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