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Barrier prediction for aluminium foil in laminates

16 TH TAPPI EUROPEAN PLACE CONFERENCE. 17 th TAPPI European PLACE Conference 20-22 May 2019 Crown Plaza Hotel Porto Portugal. Barrier prediction for aluminium foil in laminates. Presented by: Guenter Schubert Hydro Aluminium Rolled Products GmbH R&D Bonn. Your company logo.

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Barrier prediction for aluminium foil in laminates

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  1. 16TH TAPPI EUROPEAN PLACE CONFERENCE 17th TAPPI European PLACE Conference 20-22 May 2019 Crown Plaza Hotel Porto Portugal Barrier prediction for aluminium foil in laminates Presented by: Guenter Schubert Hydro Aluminium Rolled Products GmbH R&D Bonn Yourcompany logo

  2. Structure • Manufacturing aluminium foil • Definition ofpinhole, hole and break-through • Origin ofpinholes in thin aluminium foil • Detectingandmeasuringpinholesandporosity • Permeationmodelandcalculationscheme • Conclusions

  3. Structure • Manufacturing aluminium foil • Definition ofpinhole, hole and break-through • Origin ofpinholes in thin aluminium foil • Detectingandmeasuringpinholesandporosity • Permeationmodelandcalculationscheme • Conclusions

  4. Structure • Manufacturing aluminium foil • Definition ofpinhole, hole and break-through • Origin ofpinholes in thin aluminium foil • Detectingandmeasuringpinholesandporosity • Permeationmodelandcalculationscheme • Conclusions

  5. Structure • Manufacturing aluminium foil • Definition ofpinhole, hole and break-through • Origin ofpinholes in thin aluminium foil • Detectingandmeasuringpinholesandporosity • Permeationmodelandcalculationscheme • Conclusions

  6. Definition ofpinhole, hole and break-through (accordingto DIN/EN 546-4) Pinholes (pores)  < 200 µm, statisticallydistributed Holes  > 200 µm, statisticallydistributed (nometallurgicalinclusions) Holes fromrolling > 200 µm periodicallyrecurring, e.g. in thedistanceof a roll circumference Anykindofholesis not acceptable!

  7. Processchainoffoilmanufacturing Hot rolling Finishing Casting slabs Milling Preheating Roughing Continuous strip casting Separating / Slitting Annealing Cold rolling Doubling Cold rolling Soft foil Hard foil Cold rolling

  8. Pinholedetection – Usingthepinholecamera… Detector plain (e.g. the eye) Cone of scattered light Staywithyourtextinsidethisframe Aluminium foil Pinhole Illumination from the background

  9. Transport modelforlaminatescarryingpinholes in the aluminium foil s Passage surface area Polymer Polymer Polymer Polymer Al Al Al Al Pinhole Pore Pore Pore D

  10. Conclusions • Aluminium foil as a 100% crystalline metal inhibits any transport of matter • Conditional of manufacturing, there is no thin foil absolutely free of pinholes • As soon as pinholes are coated with polymers, their contribution to a permation rate can not be measured at all • Relative to their size, the effect of small pinholes is stronger • A worst case permeation calculation system gives an indication of permeation rate(input: specific permeation rate and thickness of the polymers on one or both sides of the foil; number and average size of pinholes) • The functional barrier of aluminium foil persists even in the presence of pinholes

  11. “Thank You” for your patience Yourcompany logo Presented by: Guenter Schubert - Foil Converting - Hydro Aluminium Rolled Products GmbH, R&D Bonn guenter.schubert@hydro.com

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