barrier film.ppsx

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barrier film.ppsx

  1. 1. Barrier films protect against<br />Exchange of moisture- Protection against drying up (e.g., bakery products)- Protection of hygroscopic products (e.g., milk powder)<br />Oxygen permeation- microbiologic spoilage (oxidation of greases, flavors, etc<br />e.g., bakery products, nut products, ready-to-serve meals) <br />Emerging of CO2- change of protective gas type- undesired vacuum effect (e.g., with bakery products, meat products)<br />Exchange of aroma- loss of aroma from the product packaged- assuming a different smell (e.g., coffee, spices, washing agents)<br />
  2. 2. Oxygen Permeability of different Polymers<br />Standard konditions<br />23°C, dry<br />
  3. 3. Oxygen Permeability of EVOH<br />Verbund: PE/ HV/ EVOH/ HV/ PE<br />
  4. 4. EVOH = Ethylen Vinyl Alkohol Copolymer<br />Handelsname: Soarnol (Nippon Gohsei), EVAL (Kuraray)‏<br />Gas Barriere Resin ( z.B.: O2, CO2...)‏<br />High Oil- Resistance<br />High Transparency<br />Charakteristic is the ethylen content of EVOH<br />104<br />103<br />Oxygen Permeability<br />(cm3 20µm/ m2 24 h Pa)‏<br />102<br />101<br />100<br />10-1<br />100<br />0<br />Ethylen content [%]<br />Ethylen content [%]<br />Improvement of processability<br />Function of ethylen:<br />Improvement of water resistance<br />
  5. 5. Structure of Barrier Films<br />
  6. 6. 5- Layer- Barrier Films<br />
  7. 7. Typical barrier film applications<br />Deep-draw packages for:<br />meat<br />sausage<br />cheese<br />fish<br />bakery products<br />etc.<br /><ul><li>Lid film (cover film)‏
  8. 8. Deep-drawing film (base film, tray film)‏
  9. 9. Shrink, reshrink
  10. 10. Sealing layer, sealing layer properties</li></li></ul><li>Layer Structure of Deep-Drawing Film<br />
  11. 11. Heat-Sealing of Deep-Drawing Films<br />Sealing heat is applied from above !<br />standard: 130 -140 °C ( 1,5 sec)‏<br />faster: 140 -150 °C (&lt;1,5 sec)‏<br />PA<br />HV<br />PE<br />Lid film<br />(70-120 µm)‏<br />A temp. difference at the<br />melt.point isrequired to <br />prevent film sticking tothe sealing jaw !<br />Barrier<br />layer<br />Sealing layer<br /> (LDPE, LLDPE,<br /> EVA, mPE, Surlyn)‏<br />asymmetric !<br />PE<br />HV<br />PA<br />HV<br />PE<br />Tray film<br />(150-350 µm)‏<br />Symmetric structure<br />possible, since <br />forming part issilicone coated !<br />Silicone<br />coated<br />
  12. 12. Barrier film for foam trays<br />Barrier lid film<br />Seal<br />Legend:A - heat-resistant layerB - tie layerC - gas barrierB - tie layerD - sealing layer<br />Barrier tray<br />
  13. 13. CONTACT US<br />Express Plaspack (Thailand) Co.,Ltd<br />1480 Moo 9 Old Train Road, <br />Teparuk, Muang, Samutprakarn, <br />10270, THAILAND<br />Tel. (66 2) 755-0778, 755-0757, 757-9099<br />Fax. (66 2) 755-0730<br />Email : sales@expressplaspack.com<br />
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