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  • 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
  • 5. Structure of Barrier Films
  • 6. 5- Layer- Barrier Films
  • 7. Typical barrier film applications
    Deep-draw packages for:
    meat
    sausage
    cheese
    fish
    bakery products
    etc.
    • Lid film (cover film)‏
    • 8. Deep-drawing film (base film, tray film)‏
    • 9. Shrink, reshrink
    • 10. Sealing layer, sealing layer properties
  • Layer Structure of Deep-Drawing Film
  • 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