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Barrier films    protect against Exchange of moisture-   Protection against drying up (e.g., bakery products)-   Protection of hygroscopic products (e.g., milk powder) Oxygen permeation-   microbiologic spoilage (oxidation of greases, flavors, etc e.g., bakery products, nut products, ready-to-serve meals)  Emerging of CO2-   change of protective gas type-   undesired vacuum effect (e.g., with bakery products, meat products) Exchange of aroma-   loss of aroma from the product packaged-   assuming a different smell (e.g., coffee, spices, washing agents)
Oxygen Permeability of different Polymers Standard konditions 23°C, dry
Oxygen Permeability of EVOH Verbund: PE/ HV/ EVOH/ HV/ PE
EVOH = Ethylen Vinyl Alkohol Copolymer Handelsname: Soarnol (Nippon Gohsei), EVAL (Kuraray)‏ Gas Barriere Resin ( z.B.: O2, CO2...)‏ High Oil- Resistance High Transparency Charakteristic is the ethylen content of EVOH 104 103 Oxygen Permeability (cm3 20µm/ m2 24 h Pa)‏ 102 101 100 10-1 100 0 Ethylen content [%] Ethylen content [%] Improvement of  processability Function of ethylen: Improvement of water resistance
Structure of Barrier Films
5- Layer- Barrier Films
Typical barrier film applications Deep-draw packages for: meat sausage cheese fish bakery products etc. ,[object Object]
Deep-drawing film (base film, tray film)‏
Shrink, reshrink
Sealing layer, sealing layer properties,[object Object]
Heat-Sealing of Deep-Drawing Films Sealing heat is applied from above ! standard:  130 -140 °C  (  1,5 sec)‏ faster: 140 -150 °C  (<1,5 sec)‏ PA HV PE Lid film (70-120 µm)‏ A temp. difference at the melt.point isrequired to  prevent film sticking tothe sealing jaw ! Barrier layer Sealing layer  (LDPE, LLDPE,  EVA, mPE, Surlyn)‏ asymmetric ! PE HV PA HV PE Tray film (150-350 µm)‏ Symmetric structure possible, since  forming part issilicone coated ! Silicone coated

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barrier film.pptx

  • 1. Barrier films protect against Exchange of moisture- Protection against drying up (e.g., bakery products)- Protection of hygroscopic products (e.g., milk powder) Oxygen permeation- microbiologic spoilage (oxidation of greases, flavors, etc e.g., bakery products, nut products, ready-to-serve meals) Emerging of CO2- change of protective gas type- undesired vacuum effect (e.g., with bakery products, meat products) Exchange of aroma- loss of aroma from the product packaged- assuming a different smell (e.g., coffee, spices, washing agents)
  • 2. Oxygen Permeability of different Polymers Standard konditions 23°C, dry
  • 3. Oxygen Permeability of EVOH Verbund: PE/ HV/ EVOH/ HV/ PE
  • 4. EVOH = Ethylen Vinyl Alkohol Copolymer Handelsname: Soarnol (Nippon Gohsei), EVAL (Kuraray)‏ Gas Barriere Resin ( z.B.: O2, CO2...)‏ High Oil- Resistance High Transparency Charakteristic is the ethylen content of EVOH 104 103 Oxygen Permeability (cm3 20µm/ m2 24 h Pa)‏ 102 101 100 10-1 100 0 Ethylen content [%] Ethylen content [%] Improvement of processability Function of ethylen: Improvement of water resistance
  • 7.
  • 8. Deep-drawing film (base film, tray film)‏
  • 10.
  • 11. Heat-Sealing of Deep-Drawing Films Sealing heat is applied from above ! standard: 130 -140 °C ( 1,5 sec)‏ faster: 140 -150 °C (<1,5 sec)‏ PA HV PE Lid film (70-120 µm)‏ A temp. difference at the melt.point isrequired to prevent film sticking tothe sealing jaw ! Barrier layer Sealing layer (LDPE, LLDPE, EVA, mPE, Surlyn)‏ asymmetric ! PE HV PA HV PE Tray film (150-350 µm)‏ Symmetric structure possible, since forming part issilicone coated ! Silicone coated
  • 12. Barrier film for foam trays Barrier lid film Seal Legend:A - heat-resistant layerB - tie layerC - gas barrierB - tie layerD - sealing layer Barrier tray
  • 13. CONTACT US Express Plaspack (Thailand) Co.,Ltd 1480 Moo 9 Old Train Road, Teparuk, Muang, Samutprakarn, 10270, THAILAND Tel. (66 2) 755-0778, 755-0757, 757-9099 Fax. (66 2) 755-0730 Email : sales@expressplaspack.com