1 / 11

Barrier prediction for aluminium foil in laminates

Explore pinhole detection and permeation modeling for aluminium foil in laminates. Learn about manufacturing processes, pinhole definitions, and conclusions on barrier properties. Presented by Guenter Schubert from Hydro Aluminium Rolled Products GmbH.

doriscook
Download Presentation

Barrier prediction for aluminium foil in laminates

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related