Eco-friendly Sandwich Panel Based on Recycled Bottle Caps Core and Natural Fibre Composite Facings

Pablo Resende Oliveira, Júlio Cesar dos Santos, Sergio Luiz Moni Ribeiro Filho, Bruna Torres Ferreira, Tulio Hallak Panzera*, Fabrizio L Scarpa

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

5 Citations (Scopus)
30 Downloads (Pure)


This is the first attempt to combine disposed bottle caps and natural fibres into sandwich panels. A full factorial design is performed to identify the effects of the skin type (aluminium or coir fibre reinforced laminates) and bottle cap core packing (cubic and orthotropic) on the mechanical properties of the proposed panels. The coir fibre composite skin provides maximum core shear strength, 29 % higher than the aluminium-based panels, in cubic packing, while the flexural modulus is reduced by 45 %. An interlocking effect between the skin and the core is evidenced when coir fibre composites are used. In addition, the cubic cell packing increases the specific mechanical properties, even though with a higher density. The results highlight a promising association of green components and plastic bottle caps for secondary structural applications.
Original languageEnglish
Pages (from-to)1798–1807
Number of pages10
JournalFibers and Polymers
Publication statusPublished - 3 Sep 2020


  • Sandwich panel
  • Coir fibres
  • Bottle caps
  • Sustainability
  • Design of experiment


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